diff --git a/backend/controller/cronjobs/cronjobs_integration_test.go b/backend/controller/cronjobs/cronjobs_integration_test.go
new file mode 100644
index 0000000000..cb07d02fd4
--- /dev/null
+++ b/backend/controller/cronjobs/cronjobs_integration_test.go
@@ -0,0 +1,130 @@
+//go:build integration
+
+package cronjobs
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"sync"
+	"testing"
+	"time"
+
+	"connectrpc.com/connect"
+	"github.com/TBD54566975/ftl/backend/controller/scheduledtask"
+	"github.com/TBD54566975/ftl/backend/controller/sql/sqltest"
+	ftlv1 "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1"
+	"github.com/TBD54566975/ftl/backend/schema"
+	"github.com/TBD54566975/ftl/internal/cron"
+	"github.com/TBD54566975/ftl/internal/log"
+	"github.com/TBD54566975/ftl/internal/model"
+	"github.com/TBD54566975/ftl/internal/slices"
+	"github.com/alecthomas/assert/v2"
+	"github.com/alecthomas/types/optional"
+	"github.com/benbjohnson/clock"
+	"github.com/jpillora/backoff"
+)
+
+type mockScheduler struct {
+}
+
+func (s *mockScheduler) Singleton(retry backoff.Backoff, job scheduledtask.Job) {
+	// do nothing
+}
+
+func (s *mockScheduler) Parallel(retry backoff.Backoff, job scheduledtask.Job) {
+	// do nothing
+}
+
+type controller struct {
+	key      model.ControllerKey
+	DAL      DAL
+	clock    *clock.Mock
+	cronJobs *Service
+}
+
+func TestService(t *testing.T) {
+	t.Parallel()
+	ctx := log.ContextWithNewDefaultLogger(context.Background())
+	ctx, cancel := context.WithCancel(ctx)
+	t.Cleanup(cancel)
+
+	conn := sqltest.OpenForTesting(ctx, t)
+	dal, err := New(ctx, conn)
+	assert.NoError(t, err)
+
+	config := Config{Timeout: time.Minute * 5}
+	clock := clock.NewMock()
+	scheduler := &mockScheduler{}
+
+	verbCallCount := map[string]int{}
+	verbCallCountLock := sync.Mutex{}
+
+	// initial jobs
+	jobsToCreate := []model.CronJob{}
+	for i := range 20 {
+		now := clock.Now()
+		cronStr := "*/10 * * * * * *"
+		pattern, err := cron.Parse(cronStr)
+		assert.NoError(t, err)
+		next, err := cron.NextAfter(pattern, now, false)
+		assert.NoError(t, err)
+		jobsToCreate = append(jobsToCreate, model.CronJob{
+			Key:           model.NewCronJobKey("initial", fmt.Sprintf("verb%d", i)),
+			Verb          model.VerbRef{Module: "initial", Name: fmt.Sprintf("verb%d", i)},
+			Schedule      pattern.String(),
+			StartTime     now(),
+			NextExecution next,
+			State         CronJobStateIdle,
+		})
+	}
+
+	dal.CreateDeployment(ctx, "go", &schema.Module{
+		Name: "initial",
+	}, artefacts []DeploymentArtefact{}, []IngressRoutingEntry{}, jobsToCreate) (key model.DeploymentKey, err error)
+
+	controllers := []*controller{}
+	for i := range 5 {
+		key := model.NewControllerKey("localhost", strconv.Itoa(8080+i))
+		controller := &controller{
+			key:   key,
+			DAL:   dal,
+			clock: clock,
+			cronJobs: NewForTesting(ctx, key, "test.com", config, dal, scheduler, func(ctx context.Context, r *connect.Request[ftlv1.CallRequest], o optional.Option[model.RequestKey], s string) (*connect.Response[ftlv1.CallResponse], error) {
+				verbRef := schema.RefFromProto(r.Msg.Verb)
+
+				verbCallCountLock.Lock()
+				verbCallCount[verbRef.Name]++
+				verbCallCountLock.Unlock()
+
+				return &connect.Response[ftlv1.CallResponse]{}, nil
+			}, clock),
+		}
+		controllers = append(controllers, controller)
+	}
+
+	time.Sleep(time.Millisecond * 100)
+
+	for _, c := range controllers {
+		go func() {
+			c.cronJobs.UpdatedControllerList(ctx, slices.Map(controllers, func(ctrl *controller) dal.Controller {
+				return dal.Controller{
+					Key: ctrl.key,
+				}
+			}))
+			_, _ = c.cronJobs.syncJobs(ctx)
+		}()
+	}
+
+	clock.Add(time.Second * 5)
+	time.Sleep(time.Millisecond * 100)
+	for range 3 {
+		clock.Add(time.Second * 10)
+		time.Sleep(time.Millisecond * 100)
+	}
+
+	for _, j := range jobsToCreate {
+		count := verbCallCount[j.Verb.Name]
+		assert.Equal(t, count, 3, "expected verb %s to be called 3 times", j.Verb.Name)
+	}
+}