diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbbb18f..ec463d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 **Features**:
 
 - Add support for speedscope rendering of Android reactnative profiles ([#386](https://github.com/getsentry/vroom/pull/386))
+- Add callTree generation for reactnative (android+js) profiles ([#390](https://github.com/getsentry/vroom/pull/390))
 
 **Bug Fixes**:
 
diff --git a/internal/profile/legacy.go b/internal/profile/legacy.go
index 1849192..f0a965a 100644
--- a/internal/profile/legacy.go
+++ b/internal/profile/legacy.go
@@ -24,6 +24,7 @@ import (
 const maxProfileDurationForCallTrees = 15 * time.Second
 
 var ErrProfileHasNoTrace = errors.New("profile has no trace")
+var ErrReactHasInvalidJsTrace = errors.New("react-android profile has invalid js trace")
 var member void
 
 type (
@@ -146,6 +147,26 @@ func (p LegacyProfile) CallTrees() (map[uint64][]*nodetree.Node, error) {
 	if p.Trace == nil {
 		return nil, ErrProfileHasNoTrace
 	}
+	_, ok := p.Trace.(Android)
+	// this is to handle only the Reactnative (android + js)
+	// use case. If it's an Android profile but there is no
+	// js profile, we'll skip this entirely
+	if ok && p.JsProfile != nil && len(p.JsProfile) > 0 {
+		st, err := unmarshalSampleProfile(p.JsProfile)
+		if err != nil {
+			return nil, ErrReactHasInvalidJsTrace
+		}
+		jsProf := sample.Profile{
+			RawProfile: sample.RawProfile{
+				Trace: st,
+			},
+		}
+		err = fillSampleProfileMetadata(&jsProf)
+		if err != nil {
+			return nil, err
+		}
+		return jsProf.CallTrees()
+	}
 	return p.Trace.CallTrees(), nil
 }
 
@@ -472,3 +493,21 @@ func unmarshalSampleProfile(p json.RawMessage) (sample.Trace, error) {
 
 	return st, nil
 }
+
+// CallTree generation expect activeThreadID to be set in
+// order to be able to choose which samples should be used
+// for the aggregation.
+// Here we set it to the only thread that the js profile has.
+func fillSampleProfileMetadata(sp *sample.Profile) error {
+	for threadID := range sp.Trace.ThreadMetadata {
+		tid, err := strconv.ParseUint(threadID, 10, 64)
+		if err != nil {
+			return err
+		}
+		sp.Transaction = transaction.Transaction{
+			ActiveThreadID: tid,
+		}
+		break
+	}
+	return nil
+}