diff --git a/src/main/java/at/procon/eventhub/config/EventHubProperties.java b/src/main/java/at/procon/eventhub/config/EventHubProperties.java
index 73c209f..acafed7 100644
--- a/src/main/java/at/procon/eventhub/config/EventHubProperties.java
+++ b/src/main/java/at/procon/eventhub/config/EventHubProperties.java
@@ -356,12 +356,23 @@ public class EventHubProperties {
     }
 
     public static class Processing {
+        private TimelineInputMode timelineInputMode = TimelineInputMode.INTERVALS;
         private int operatingSplitIdleHours = 7;
         private int significantDrivingMinutes = 3;
         private int minimumRestPeriodMinutes = 720;
         private int mergeGapSeconds = 0;
         private int gapDetectionToleranceSeconds = 0;
 
+        public TimelineInputMode getTimelineInputMode() {
+            return timelineInputMode;
+        }
+
+        public void setTimelineInputMode(TimelineInputMode timelineInputMode) {
+            if (timelineInputMode != null) {
+                this.timelineInputMode = timelineInputMode;
+            }
+        }
+
         public int getOperatingSplitIdleHours() {
             return operatingSplitIdleHours;
         }
@@ -403,6 +414,11 @@ public class EventHubProperties {
         }
     }
 
+    public enum TimelineInputMode {
+        INTERVALS,
+        EVENTS
+    }
+
     public static class LegalRequirements {
         private static final String DEFAULT_BASE_URL = "https://legalrequirements.services.bytebar.eu/ODataV4/LR";
 
diff --git a/src/main/java/at/procon/eventhub/tachographfilesession/service/EventBackedDriverTimelineBuilder.java b/src/main/java/at/procon/eventhub/tachographfilesession/service/EventBackedDriverTimelineBuilder.java
new file mode 100644
index 0000000..35abf56
--- /dev/null
+++ b/src/main/java/at/procon/eventhub/tachographfilesession/service/EventBackedDriverTimelineBuilder.java
@@ -0,0 +1,427 @@
+package at.procon.eventhub.tachographfilesession.service;
+
+import at.procon.eventhub.dto.EventHubEventDto;
+import at.procon.eventhub.tachographfilesession.model.DriverExtractionSession;
+import at.procon.eventhub.tachographfilesession.model.ExtractedSupportEvent;
+import at.procon.eventhub.tachographfilesession.model.ExtractionWarning;
+import at.procon.eventhub.tachographfilesession.model.ResolvedActivityInterval;
+import at.procon.eventhub.tachographfilesession.model.ResolvedDriverTimeline;
+import at.procon.eventhub.tachographfilesession.model.ResolvedVehicleUsageInterval;
+import at.procon.eventhub.tachographfilesession.model.TachographFileSession;
+import at.procon.eventhub.tachographfilesession.model.TachographTimelineEventBundle;
+import com.fasterxml.jackson.databind.JsonNode;
+import java.math.BigDecimal;
+import java.time.OffsetDateTime;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import org.springframework.stereotype.Component;
+
+@Component
+public class EventBackedDriverTimelineBuilder {
+
+    private final DriverTimelineEventBuilder eventBuilder;
+
+    public EventBackedDriverTimelineBuilder(DriverTimelineEventBuilder eventBuilder) {
+        this.eventBuilder = eventBuilder;
+    }
+
+    public ResolvedDriverTimeline build(
+            TachographFileSession session,
+            DriverExtractionSession driverSession
+    ) {
+        TachographTimelineEventBundle bundle = eventBuilder.buildEventBundle(session, driverSession);
+        List<ResolvedActivityInterval> activityIntervals =
+                reconstructActivityIntervals(bundle.activityEvents());
+        List<ResolvedVehicleUsageInterval> vehicleUsageIntervals =
+                reconstructVehicleUsageIntervals(session.sessionId(), driverSession.driverKey(), bundle.vehicleUsageEvents());
+        List<ExtractedSupportEvent> supportEvents =
+                reconstructSupportEvents(bundle.supportEvents());
+        List<ExtractionWarning> warnings = mergeWarnings(session.warnings(), driverSession.warnings());
+
+        OffsetDateTime loadedFrom = minTimestamp(activityIntervals, vehicleUsageIntervals, supportEvents);
+        OffsetDateTime loadedTo = maxTimestamp(activityIntervals, vehicleUsageIntervals, supportEvents);
+        return new ResolvedDriverTimeline(
+                resolveSourceKind(session, bundle),
+                loadedFrom,
+                loadedTo,
+                vehicleUsageIntervals,
+                activityIntervals,
+                supportEvents,
+                warnings
+        );
+    }
+
+    private List<ResolvedActivityInterval> reconstructActivityIntervals(List<EventHubEventDto> activityEvents) {
+        if (activityEvents == null || activityEvents.isEmpty()) {
+            return List.of();
+        }
+        Map<String, ActivityAccumulator> byIntervalId = new LinkedHashMap<>();
+        for (EventHubEventDto event : activityEvents) {
+            if (!"DRIVER_ACTIVITY".equals(event.eventDomain().name())) {
+                continue;
+            }
+            JsonNode raw = raw(event);
+            String intervalId = text(raw, "intervalId");
+            if (intervalId == null) {
+                intervalId = text(raw, "sourceRowId");
+            }
+            if (intervalId == null) {
+                intervalId = event.externalSourceEventId();
+            }
+            String resolvedIntervalId = intervalId;
+            ActivityAccumulator accumulator = byIntervalId.computeIfAbsent(
+                    resolvedIntervalId,
+                    ignored -> new ActivityAccumulator(resolvedIntervalId)
+            );
+            accumulator.accept(event, raw);
+        }
+        List<ResolvedActivityInterval> result = new ArrayList<>(byIntervalId.size());
+        for (ActivityAccumulator accumulator : byIntervalId.values()) {
+            ResolvedActivityInterval interval = accumulator.finish();
+            if (interval != null) {
+                result.add(interval);
+            }
+        }
+        result.sort(Comparator.comparing(ResolvedActivityInterval::from)
+                .thenComparing(ResolvedActivityInterval::to)
+                .thenComparing(ResolvedActivityInterval::activityType, Comparator.nullsLast(String::compareTo)));
+        return List.copyOf(result);
+    }
+
+    private List<ResolvedVehicleUsageInterval> reconstructVehicleUsageIntervals(
+            UUID sessionId,
+            String driverKey,
+            List<EventHubEventDto> vehicleUsageEvents
+    ) {
+        if (vehicleUsageEvents == null || vehicleUsageEvents.isEmpty()) {
+            return List.of();
+        }
+        Map<String, VehicleUsageAccumulator> byIntervalId = new LinkedHashMap<>();
+        for (EventHubEventDto event : vehicleUsageEvents) {
+            if (!"DRIVER_CARD".equals(event.eventDomain().name())) {
+                continue;
+            }
+            JsonNode raw = raw(event);
+            String intervalId = text(raw, "intervalId");
+            if (intervalId == null) {
+                intervalId = text(raw, "sourceRowId");
+            }
+            if (intervalId == null) {
+                intervalId = event.externalSourceEventId();
+            }
+            String resolvedIntervalId = intervalId;
+            VehicleUsageAccumulator accumulator = byIntervalId.computeIfAbsent(
+                    resolvedIntervalId,
+                    ignored -> new VehicleUsageAccumulator(sessionId, driverKey, resolvedIntervalId)
+            );
+            accumulator.accept(event, raw);
+        }
+        List<ResolvedVehicleUsageInterval> result = new ArrayList<>(byIntervalId.size());
+        for (VehicleUsageAccumulator accumulator : byIntervalId.values()) {
+            ResolvedVehicleUsageInterval interval = accumulator.finish();
+            if (interval != null) {
+                result.add(interval);
+            }
+        }
+        result.sort(Comparator.comparing(ResolvedVehicleUsageInterval::from)
+                .thenComparing(ResolvedVehicleUsageInterval::to, Comparator.nullsLast(Comparator.naturalOrder())));
+        return List.copyOf(result);
+    }
+
+    private List<ExtractedSupportEvent> reconstructSupportEvents(List<EventHubEventDto> supportEvents) {
+        if (supportEvents == null || supportEvents.isEmpty()) {
+            return List.of();
+        }
+        List<ExtractedSupportEvent> result = new ArrayList<>(supportEvents.size());
+        for (EventHubEventDto event : supportEvents) {
+            JsonNode raw = raw(event);
+            String eventId = text(raw, "supportEventId");
+            if (eventId == null) {
+                eventId = event.externalSourceEventId();
+            }
+            BigDecimal latitude = event.position() == null ? null : event.position().latitude();
+            BigDecimal longitude = event.position() == null ? null : event.position().longitude();
+            result.add(new ExtractedSupportEvent(
+                    eventId,
+                    event.occurredAt(),
+                    event.eventDomain().name(),
+                    text(raw, "supportEventType") == null ? event.eventType().name() : text(raw, "supportEventType"),
+                    text(raw, "slot"),
+                    text(raw, "registrationKey"),
+                    text(raw, "vehicleKey"),
+                    text(raw, "country"),
+                    text(raw, "region"),
+                    latitude,
+                    longitude,
+                    text(raw, "authenticationStatus"),
+                    longValue(raw, "odometerKm"),
+                    text(raw, "code"),
+                    text(raw, "rawRecordPath")
+            ));
+        }
+        result.sort(Comparator.comparing(ExtractedSupportEvent::occurredAt)
+                .thenComparing(ExtractedSupportEvent::eventDomain, Comparator.nullsLast(String::compareTo))
+                .thenComparing(ExtractedSupportEvent::eventId, Comparator.nullsLast(String::compareTo)));
+        return List.copyOf(result);
+    }
+
+    private List<ExtractionWarning> mergeWarnings(List<ExtractionWarning> sessionWarnings, List<ExtractionWarning> driverWarnings) {
+        LinkedHashSet<ExtractionWarning> merged = new LinkedHashSet<>();
+        if (sessionWarnings != null) {
+            merged.addAll(sessionWarnings);
+        }
+        if (driverWarnings != null) {
+            merged.addAll(driverWarnings);
+        }
+        return List.copyOf(merged);
+    }
+
+    private OffsetDateTime minTimestamp(
+            List<ResolvedActivityInterval> activityIntervals,
+            List<ResolvedVehicleUsageInterval> vehicleUsageIntervals,
+            List<ExtractedSupportEvent> supportEvents
+    ) {
+        OffsetDateTime min = null;
+        for (ResolvedActivityInterval interval : activityIntervals) {
+            min = min(min, interval.from());
+        }
+        for (ResolvedVehicleUsageInterval interval : vehicleUsageIntervals) {
+            min = min(min, interval.from());
+        }
+        for (ExtractedSupportEvent supportEvent : supportEvents) {
+            min = min(min, supportEvent.occurredAt());
+        }
+        return min;
+    }
+
+    private OffsetDateTime maxTimestamp(
+            List<ResolvedActivityInterval> activityIntervals,
+            List<ResolvedVehicleUsageInterval> vehicleUsageIntervals,
+            List<ExtractedSupportEvent> supportEvents
+    ) {
+        OffsetDateTime max = null;
+        for (ResolvedActivityInterval interval : activityIntervals) {
+            max = max(max, interval.to());
+        }
+        for (ResolvedVehicleUsageInterval interval : vehicleUsageIntervals) {
+            max = max(max, interval.to());
+        }
+        for (ExtractedSupportEvent supportEvent : supportEvents) {
+            max = max(max, supportEvent.occurredAt());
+        }
+        return max;
+    }
+
+    private String resolveSourceKind(TachographFileSession session, TachographTimelineEventBundle bundle) {
+        for (EventHubEventDto event : bundle.allEvents()) {
+            JsonNode raw = raw(event);
+            String sourceKind = text(raw, "sourceKind");
+            if (sourceKind != null) {
+                return sourceKind;
+            }
+            if (event.packageInfo() != null && event.packageInfo().eventSource() != null
+                    && event.packageInfo().eventSource().sourceKind() != null) {
+                return event.packageInfo().eventSource().sourceKind();
+            }
+        }
+        return session.metadata().driverCardFile() ? "DRIVER_CARD" : "VEHICLE_UNIT";
+    }
+
+    private OffsetDateTime min(OffsetDateTime left, OffsetDateTime right) {
+        if (left == null) {
+            return right;
+        }
+        if (right == null) {
+            return left;
+        }
+        return left.isBefore(right) ? left : right;
+    }
+
+    private OffsetDateTime max(OffsetDateTime left, OffsetDateTime right) {
+        if (left == null) {
+            return right;
+        }
+        if (right == null) {
+            return left;
+        }
+        return left.isAfter(right) ? left : right;
+    }
+
+    private JsonNode raw(EventHubEventDto event) {
+        JsonNode payload = event.payload();
+        if (payload == null || payload.isMissingNode()) {
+            return null;
+        }
+        JsonNode raw = payload.get("raw");
+        return raw == null || raw.isNull() ? payload : raw;
+    }
+
+    private String text(JsonNode node, String field) {
+        if (node == null || field == null) {
+            return null;
+        }
+        JsonNode value = node.get(field);
+        return value == null || value.isNull() ? null : value.asText(null);
+    }
+
+    private boolean booleanValue(JsonNode node, String field) {
+        if (node == null || field == null) {
+            return false;
+        }
+        JsonNode value = node.get(field);
+        return value != null && !value.isNull() && value.asBoolean(false);
+    }
+
+    private Long longValue(JsonNode node, String field) {
+        if (node == null || field == null) {
+            return null;
+        }
+        JsonNode value = node.get(field);
+        if (value == null || value.isNull()) {
+            return null;
+        }
+        return value.isNumber() ? value.asLong() : Long.parseLong(value.asText());
+    }
+
+    private List<String> stringList(JsonNode node, String field) {
+        if (node == null || field == null) {
+            return List.of();
+        }
+        JsonNode value = node.get(field);
+        if (value == null || value.isNull() || !value.isArray()) {
+            return List.of();
+        }
+        List<String> result = new ArrayList<>();
+        value.forEach(item -> {
+            String text = item == null || item.isNull() ? null : item.asText(null);
+            if (text != null && !text.isBlank()) {
+                result.add(text);
+            }
+        });
+        return List.copyOf(result);
+    }
+
+    private String detailText(EventHubEventDto event, String field) {
+        if (event.eventDetails() == null || event.eventDetails().attributes() == null) {
+            return null;
+        }
+        JsonNode value = event.eventDetails().attributes().get(field);
+        return value == null || value.isNull() ? null : value.asText(null);
+    }
+
+    private String activityType(EventHubEventDto event) {
+        return switch (event.eventType()) {
+            case DRIVE -> "DRIVE";
+            case WORK -> "WORK";
+            case AVAILABILITY -> "AVAILABILITY";
+            case BREAK_REST -> "BREAK_REST";
+            default -> "UNKNOWN";
+        };
+    }
+
+    private Long toKilometers(Long meters) {
+        return meters == null ? null : meters / 1_000L;
+    }
+
+    private final class ActivityAccumulator {
+        private final String intervalId;
+        private OffsetDateTime startedAt;
+        private OffsetDateTime endedAt;
+        private EventHubEventDto sample;
+        private JsonNode raw;
+
+        private ActivityAccumulator(String intervalId) {
+            this.intervalId = intervalId;
+        }
+
+        private void accept(EventHubEventDto event, JsonNode raw) {
+            if (sample == null) {
+                sample = event;
+                this.raw = raw;
+            }
+            if (event.lifecycle() == at.procon.eventhub.dto.EventLifecycle.START) {
+                startedAt = event.occurredAt();
+            } else if (event.lifecycle() == at.procon.eventhub.dto.EventLifecycle.END) {
+                endedAt = event.occurredAt();
+            }
+        }
+
+        private ResolvedActivityInterval finish() {
+            if (sample == null || startedAt == null || endedAt == null || !endedAt.isAfter(startedAt)) {
+                return null;
+            }
+            return new ResolvedActivityInterval(
+                    intervalId,
+                    startedAt,
+                    endedAt,
+                    java.time.Duration.between(startedAt, endedAt).getSeconds(),
+                    activityType(sample),
+                    detailText(sample, "cardSlot"),
+                    detailText(sample, "cardStatus"),
+                    detailText(sample, "drivingStatus"),
+                    text(raw, "registrationKey"),
+                    text(raw, "vehicleKey"),
+                    text(raw, "sourceKind"),
+                    stringList(raw, "sourceRowIds"),
+                    booleanValue(raw, "synthetic"),
+                    booleanValue(raw, "clippedToRequestedPeriod"),
+                    text(raw, "level") == null ? "RAW_INTERVAL" : text(raw, "level")
+            );
+        }
+    }
+
+    private final class VehicleUsageAccumulator {
+        private final UUID sessionId;
+        private final String driverKey;
+        private final String intervalId;
+        private OffsetDateTime startedAt;
+        private OffsetDateTime endedAt;
+        private Long odometerBeginKm;
+        private Long odometerEndKm;
+        private JsonNode raw;
+
+        private VehicleUsageAccumulator(UUID sessionId, String driverKey, String intervalId) {
+            this.sessionId = sessionId;
+            this.driverKey = driverKey;
+            this.intervalId = intervalId;
+        }
+
+        private void accept(EventHubEventDto event, JsonNode raw) {
+            if (this.raw == null) {
+                this.raw = raw;
+            }
+            if (event.eventType() == at.procon.eventhub.dto.EventType.CARD_INSERTED) {
+                startedAt = event.occurredAt();
+                odometerBeginKm = toKilometers(event.odometerM());
+            } else if (event.eventType() == at.procon.eventhub.dto.EventType.CARD_WITHDRAWN) {
+                endedAt = event.occurredAt();
+                odometerEndKm = toKilometers(event.odometerM());
+            }
+        }
+
+        private ResolvedVehicleUsageInterval finish() {
+            if (startedAt == null) {
+                return null;
+            }
+            return ResolvedVehicleUsageInterval.resolved(
+                    sessionId,
+                    driverKey,
+                    intervalId,
+                    startedAt,
+                    endedAt,
+                    odometerBeginKm,
+                    odometerEndKm,
+                    text(raw, "registrationKey"),
+                    text(raw, "vehicleKey"),
+                    text(raw, "sourceKind"),
+                    stringList(raw, "sourceRowIds")
+            );
+        }
+    }
+}
diff --git a/src/main/java/at/procon/eventhub/tachographfilesession/service/TachographFileSessionProcessingService.java b/src/main/java/at/procon/eventhub/tachographfilesession/service/TachographFileSessionProcessingService.java
index 6718cb4..6168cae 100644
--- a/src/main/java/at/procon/eventhub/tachographfilesession/service/TachographFileSessionProcessingService.java
+++ b/src/main/java/at/procon/eventhub/tachographfilesession/service/TachographFileSessionProcessingService.java
@@ -35,17 +35,20 @@ public class TachographFileSessionProcessingService {
     private final TachographFileSessionRepository repository;
     private final DriverTimelineBuilder driverTimelineBuilder;
     private final DriverTimelineReusableProjectionBuilder reusableProjectionBuilder;
+    private final EventBackedDriverTimelineBuilder eventBackedDriverTimelineBuilder;
     private final EventHubProperties properties;
 
     public TachographFileSessionProcessingService(
             TachographFileSessionRepository repository,
             DriverTimelineBuilder driverTimelineBuilder,
             DriverTimelineReusableProjectionBuilder reusableProjectionBuilder,
+            EventBackedDriverTimelineBuilder eventBackedDriverTimelineBuilder,
             EventHubProperties properties
     ) {
         this.repository = repository;
         this.driverTimelineBuilder = driverTimelineBuilder;
         this.reusableProjectionBuilder = reusableProjectionBuilder;
+        this.eventBackedDriverTimelineBuilder = eventBackedDriverTimelineBuilder;
         this.properties = properties;
     }
 
@@ -64,7 +67,7 @@ public class TachographFileSessionProcessingService {
             throw new DriverNotFoundInSessionException(sessionId, driverKey);
         }
 
-        ResolvedDriverTimeline timeline = driverTimelineBuilder.build(session, driver);
+        ResolvedDriverTimeline timeline = resolveTimeline(session, driver);
         OffsetDateTime loadedFrom = timeline.loadedFrom();
         OffsetDateTime loadedTo = timeline.loadedTo();
         OffsetDateTime requestedFrom = effectiveRequest.occurredFrom() == null ? loadedFrom : utc(effectiveRequest.occurredFrom());
@@ -146,7 +149,7 @@ public class TachographFileSessionProcessingService {
             throw new DriverNotFoundInSessionException(sessionId, driverKey);
         }
 
-        ResolvedDriverTimeline timeline = driverTimelineBuilder.build(session, driver);
+        ResolvedDriverTimeline timeline = resolveTimeline(session, driver);
         OffsetDateTime requestedFrom = effectiveRequest.occurredFrom() == null ? timeline.loadedFrom() : utc(effectiveRequest.occurredFrom());
         OffsetDateTime requestedTo = effectiveRequest.occurredTo() == null ? timeline.loadedTo() : utc(effectiveRequest.occurredTo());
         if (requestedFrom != null && requestedTo != null && requestedTo.isBefore(requestedFrom)) {
@@ -245,6 +248,17 @@ public class TachographFileSessionProcessingService {
         );
     }
 
+    private ResolvedDriverTimeline resolveTimeline(
+            TachographFileSession session,
+            DriverExtractionSession driver
+    ) {
+        if (properties.getTachographFileSession().getProcessing().getTimelineInputMode()
+                == EventHubProperties.TimelineInputMode.EVENTS) {
+            return eventBackedDriverTimelineBuilder.build(session, driver);
+        }
+        return driverTimelineBuilder.build(session, driver);
+    }
+
     private List<TachographEsperActivityIntervalEvent> clipEsperActivityIntervalEvents(
             List<TachographEsperActivityIntervalEvent> intervals,
             OffsetDateTime requestedFrom,
diff --git a/src/test/java/at/procon/eventhub/tachographfilesession/service/EventBackedDriverTimelineBuilderTest.java b/src/test/java/at/procon/eventhub/tachographfilesession/service/EventBackedDriverTimelineBuilderTest.java
new file mode 100644
index 0000000..74968ce
--- /dev/null
+++ b/src/test/java/at/procon/eventhub/tachographfilesession/service/EventBackedDriverTimelineBuilderTest.java
@@ -0,0 +1,110 @@
+package at.procon.eventhub.tachographfilesession.service;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import at.procon.eventhub.service.EventDetailsFactory;
+import at.procon.eventhub.tachographfilesession.model.DriverExtractionSession;
+import at.procon.eventhub.tachographfilesession.model.ExtractedCardActivityInterval;
+import at.procon.eventhub.tachographfilesession.model.ExtractedCardVehicleUsageInterval;
+import at.procon.eventhub.tachographfilesession.model.ExtractedDriver;
+import at.procon.eventhub.tachographfilesession.model.ExtractedDriverCard;
+import at.procon.eventhub.tachographfilesession.model.ExtractedSupportEvent;
+import at.procon.eventhub.tachographfilesession.model.ExtractedVehicle;
+import at.procon.eventhub.tachographfilesession.model.ExtractedVehicleRegistration;
+import at.procon.eventhub.tachographfilesession.model.ExtractionStats;
+import at.procon.eventhub.tachographfilesession.model.ResolvedDriverTimeline;
+import at.procon.eventhub.tachographfilesession.model.TachographFileSession;
+import at.procon.eventhub.tachographfilesession.model.TachographFileSessionMetadata;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.math.BigDecimal;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.temporal.ChronoUnit;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+class EventBackedDriverTimelineBuilderTest {
+
+    private final DriverTimelineBuilder directBuilder = new DriverTimelineBuilder();
+    private final EventBackedDriverTimelineBuilder eventBackedBuilder =
+            new EventBackedDriverTimelineBuilder(
+                    new IntervalBackedDriverTimelineEventBuilder(
+                            directBuilder,
+                            new DriverKeyFactory(),
+                            new VehicleKeyFactory(),
+                            new EventDetailsFactory(new ObjectMapper())
+                    )
+            );
+
+    @Test
+    void reconstructsTimelineFromEvents() {
+        DriverExtractionSession driver = new DriverExtractionSession(
+                "12:123",
+                new ExtractedDriver("12:123", "DRV:12:123", "Doe", "Jane", null, null, null, null, null),
+                new ExtractedDriverCard("CARD:12:123", "12", "123", null, null, null, null),
+                List.of(new ExtractedVehicleRegistration("12:REG-1", "VR:12:REG-1", "12", "REG-1")),
+                List.of(new ExtractedVehicle("VIN-1", "VIN:VIN-1", "VIN-1")),
+                List.of(new ExtractedCardVehicleUsageInterval(
+                        "CVU-1",
+                        OffsetDateTime.parse("2026-05-01T08:00:00Z"),
+                        OffsetDateTime.parse("2026-05-01T10:00:00Z"),
+                        100L,
+                        200L,
+                        "12:REG-1",
+                        "VIN-1",
+                        "vu-1"
+                )),
+                List.of(new ExtractedCardActivityInterval(
+                        "ACT-1",
+                        OffsetDateTime.parse("2026-05-01T08:30:00Z"),
+                        OffsetDateTime.parse("2026-05-01T09:00:00Z"),
+                        "DRIVE",
+                        "DRIVER",
+                        "INSERTED",
+                        "SINGLE",
+                        "12:REG-1",
+                        "VIN-1",
+                        "a"
+                )),
+                List.of(new ExtractedSupportEvent(
+                        "SUP-1",
+                        OffsetDateTime.parse("2026-05-01T08:45:00Z"),
+                        "POSITION",
+                        "GNSS_ACCUMULATED_DRIVING",
+                        "DRIVER",
+                        "12:REG-1",
+                        "VIN-1",
+                        null,
+                        null,
+                        BigDecimal.valueOf(48.2082),
+                        BigDecimal.valueOf(16.3738),
+                        "AUTHENTIC",
+                        150L,
+                        null,
+                        "raw-path"
+                )),
+                List.of()
+        );
+        TachographFileSession session = new TachographFileSession(
+                UUID.randomUUID(),
+                new TachographFileSessionMetadata("default", "legalrequirements-drivercard", "sample", "sample.ddd", "a", 2, "42", "b", true, null),
+                Map.of(driver.driverKey(), driver),
+                new ExtractionStats(1, 1, 1, 1, 1, 0),
+                List.of(),
+                Instant.now(),
+                Instant.now().plus(4, ChronoUnit.HOURS)
+        );
+
+        ResolvedDriverTimeline direct = directBuilder.build(session, driver);
+        ResolvedDriverTimeline reconstructed = eventBackedBuilder.build(session, driver);
+
+        assertThat(reconstructed.sourceKind()).isEqualTo(direct.sourceKind());
+        assertThat(reconstructed.loadedFrom()).isEqualTo(direct.loadedFrom());
+        assertThat(reconstructed.loadedTo()).isEqualTo(direct.loadedTo());
+        assertThat(reconstructed.activityIntervals()).containsExactlyElementsOf(direct.activityIntervals());
+        assertThat(reconstructed.vehicleUsageIntervals()).containsExactlyElementsOf(direct.vehicleUsageIntervals());
+        assertThat(reconstructed.supportEvents()).containsExactlyElementsOf(direct.supportEvents());
+    }
+}
diff --git a/src/test/java/at/procon/eventhub/tachographfilesession/service/TachographFileSessionProcessingServiceTest.java b/src/test/java/at/procon/eventhub/tachographfilesession/service/TachographFileSessionProcessingServiceTest.java
index 4e00cb5..3737969 100644
--- a/src/test/java/at/procon/eventhub/tachographfilesession/service/TachographFileSessionProcessingServiceTest.java
+++ b/src/test/java/at/procon/eventhub/tachographfilesession/service/TachographFileSessionProcessingServiceTest.java
@@ -3,6 +3,7 @@ package at.procon.eventhub.tachographfilesession.service;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import at.procon.eventhub.config.EventHubProperties;
+import at.procon.eventhub.service.EventDetailsFactory;
 import at.procon.eventhub.tachographfilesession.dto.TachographEsperEventsProcessingRequest;
 import at.procon.eventhub.tachographfilesession.dto.TachographEsperDriverProcessingResultDto;
 import at.procon.eventhub.tachographfilesession.dto.TachographOperatingPeriodsProcessingRequest;
@@ -19,6 +20,7 @@ import java.time.temporal.ChronoUnit;
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.junit.jupiter.api.Test;
 
 class TachographFileSessionProcessingServiceTest {
@@ -32,6 +34,14 @@ class TachographFileSessionProcessingServiceTest {
                 repository,
                 driverTimelineBuilder,
                 new DriverTimelineReusableProjectionBuilder(driverTimelineBuilder),
+                new EventBackedDriverTimelineBuilder(
+                        new IntervalBackedDriverTimelineEventBuilder(
+                                driverTimelineBuilder,
+                                new DriverKeyFactory(),
+                                new VehicleKeyFactory(),
+                                new EventDetailsFactory(new ObjectMapper())
+                        )
+                ),
                 properties
         );
 
@@ -106,6 +116,14 @@ class TachographFileSessionProcessingServiceTest {
                 repository,
                 driverTimelineBuilder,
                 new DriverTimelineReusableProjectionBuilder(driverTimelineBuilder),
+                new EventBackedDriverTimelineBuilder(
+                        new IntervalBackedDriverTimelineEventBuilder(
+                                driverTimelineBuilder,
+                                new DriverKeyFactory(),
+                                new VehicleKeyFactory(),
+                                new EventDetailsFactory(new ObjectMapper())
+                        )
+                ),
                 properties
         );
 
@@ -191,6 +209,92 @@ class TachographFileSessionProcessingServiceTest {
         assertThat(result.vuCardAbsentIntervalCount()).isEqualTo(1);
     }
 
+    @Test
+    void canUseEventBackedTimelineModeForEsperProcessing() {
+        EventHubProperties properties = new EventHubProperties();
+        properties.getTachographFileSession().getProcessing().setTimelineInputMode(EventHubProperties.TimelineInputMode.EVENTS);
+        TachographFileSessionRepository repository = new InMemoryTachographFileSessionRepository(properties);
+        DriverTimelineBuilder driverTimelineBuilder = new DriverTimelineBuilder();
+        TachographFileSessionProcessingService service = new TachographFileSessionProcessingService(
+                repository,
+                driverTimelineBuilder,
+                new DriverTimelineReusableProjectionBuilder(driverTimelineBuilder),
+                new EventBackedDriverTimelineBuilder(
+                        new IntervalBackedDriverTimelineEventBuilder(
+                                driverTimelineBuilder,
+                                new DriverKeyFactory(),
+                                new VehicleKeyFactory(),
+                                new EventDetailsFactory(new ObjectMapper())
+                        )
+                ),
+                properties
+        );
+
+        DriverExtractionSession driver = new DriverExtractionSession(
+                "12:123",
+                null,
+                null,
+                List.of(),
+                List.of(),
+                List.of(
+                        new ExtractedCardVehicleUsageInterval(
+                                "CVU-1",
+                                OffsetDateTime.parse("2026-05-01T08:00:00Z"),
+                                OffsetDateTime.parse("2026-05-01T11:00:00Z"),
+                                100L,
+                                200L,
+                                "12:REG-1",
+                                "VIN-1",
+                                "vu-1"
+                        ),
+                        new ExtractedCardVehicleUsageInterval(
+                                "CVU-2",
+                                OffsetDateTime.parse("2026-05-01T12:00:00Z"),
+                                OffsetDateTime.parse("2026-05-01T13:00:00Z"),
+                                201L,
+                                260L,
+                                "12:REG-2",
+                                "VIN-2",
+                                "vu-2"
+                        )
+                ),
+                List.of(
+                        new ExtractedCardActivityInterval("ACT-1", OffsetDateTime.parse("2026-05-01T08:30:00Z"), OffsetDateTime.parse("2026-05-01T09:00:00Z"), "DRIVE", "DRIVER", "INSERTED", "SINGLE", "12:REG-1", "VIN-1", "a"),
+                        new ExtractedCardActivityInterval("ACT-2", OffsetDateTime.parse("2026-05-01T09:00:00Z"), OffsetDateTime.parse("2026-05-01T10:00:00Z"), "WORK", "DRIVER", "INSERTED", "SINGLE", "12:REG-1", "VIN-1", "b"),
+                        new ExtractedCardActivityInterval("ACT-3", OffsetDateTime.parse("2026-05-01T10:00:00Z"), OffsetDateTime.parse("2026-05-01T10:05:00Z"), "DRIVE", "DRIVER", "INSERTED", "SINGLE", "12:REG-2", "VIN-2", "c")
+                ),
+                List.of(),
+                List.of()
+        );
+        TachographFileSession session = new TachographFileSession(
+                UUID.randomUUID(),
+                new TachographFileSessionMetadata("default", "legalrequirements-drivercard", "sample", "sample.ddd", "a", 3, "42", "b", true, null),
+                Map.of(driver.driverKey(), driver),
+                new ExtractionStats(1, 2, 2, 1, 1, 0),
+                List.of(),
+                Instant.now(),
+                Instant.now().plus(4, ChronoUnit.HOURS)
+        );
+        repository.save(session);
+
+        TachographEsperDriverProcessingResultDto result = service.getEsperDriverProcessingResults(
+                session.sessionId(),
+                driver.driverKey(),
+                new TachographEsperEventsProcessingRequest(
+                        OffsetDateTime.parse("2026-05-01T08:45:00Z"),
+                        OffsetDateTime.parse("2026-05-01T12:30:00Z"),
+                        3,
+                        720
+                )
+        );
+
+        assertThat(result.activityIntervalCount()).isEqualTo(3);
+        assertThat(result.drivingIntervalCount()).isEqualTo(2);
+        assertThat(result.drivingInterruptionIntervalCount()).isEqualTo(1);
+        assertThat(result.vehicleUsageIntervalCount()).isEqualTo(2);
+        assertThat(result.vuCardAbsentIntervalCount()).isEqualTo(1);
+    }
+
     @Test
     void returnsPotentialHomeOvernightStayIntervalsWhenVuCardAbsentCoversLongDti() {
         EventHubProperties properties = new EventHubProperties();
@@ -200,6 +304,14 @@ class TachographFileSessionProcessingServiceTest {
                 repository,
                 driverTimelineBuilder,
                 new DriverTimelineReusableProjectionBuilder(driverTimelineBuilder),
+                new EventBackedDriverTimelineBuilder(
+                        new IntervalBackedDriverTimelineEventBuilder(
+                                driverTimelineBuilder,
+                                new DriverKeyFactory(),
+                                new VehicleKeyFactory(),
+                                new EventDetailsFactory(new ObjectMapper())
+                        )
+                ),
                 properties
         );
 
@@ -283,6 +395,14 @@ class TachographFileSessionProcessingServiceTest {
                 repository,
                 driverTimelineBuilder,
                 new DriverTimelineReusableProjectionBuilder(driverTimelineBuilder),
+                new EventBackedDriverTimelineBuilder(
+                        new IntervalBackedDriverTimelineEventBuilder(
+                                driverTimelineBuilder,
+                                new DriverKeyFactory(),
+                                new VehicleKeyFactory(),
+                                new EventDetailsFactory(new ObjectMapper())
+                        )
+                ),
                 properties
         );