diff --git a/internal/interpreter/transformer.go b/internal/interpreter/transformer.go
new file mode 100644
index 00000000..2de2be7c
--- /dev/null
+++ b/internal/interpreter/transformer.go
@@ -0,0 +1,83 @@
+package interpreter
+
+import (
+	"context"
+
+	"github.com/nevalang/neva/internal/runtime"
+	"github.com/nevalang/neva/internal/shared"
+)
+
+type transformer struct{}
+
+func (t transformer) Transform(ctx context.Context, ll shared.LowLvlProgram) (runtime.Program, error) {
+	rPorts := make(runtime.Ports, len(ll.Ports))
+	for addr, buf := range ll.Ports {
+		rPorts[runtime.PortAddr{
+			Path: addr.Path,
+			Name: addr.Name,
+			Idx:  addr.Idx,
+		}] = make(chan runtime.Msg, buf)
+	}
+
+	rConns := make([]runtime.Connection, len(ll.Net))
+	for _, conn := range ll.Net {
+		senderAddr := runtime.PortAddr{
+			Path: conn.SenderSide.Path,
+			Name: conn.SenderSide.Name,
+			Idx:  conn.SenderSide.Idx,
+		}
+
+		senderPort, ok := rPorts[senderAddr]
+		if !ok {
+			panic("!ok")
+		}
+
+		rSenderConnSide := runtime.SenderConnectionSide{
+			Port: senderPort,
+			SenderConnectionSideMeta: runtime.SenderConnectionSideMeta{
+				PortAddr: senderAddr,
+			},
+		}
+
+		rReceivers := make([]runtime.ReceiverConnectionSide, len(conn.ReceiverSides))
+		for _, rcvr := range conn.ReceiverSides {
+			receiverPortAddr := runtime.PortAddr{
+				Path: rcvr.PortAddr.Path,
+				Name: rcvr.PortAddr.Name,
+				Idx:  rcvr.PortAddr.Idx,
+			}
+
+			receiverPort, ok := rPorts[receiverPortAddr]
+			if !ok {
+				panic("!ok")
+			}
+
+			selectors := make([]runtime.Selector, len(rcvr.Selectors))
+			for _, sel := range rcvr.Selectors {
+				selectors = append(selectors, runtime.Selector{
+					RecField: sel.RecField,
+					ArrIdx:   sel.ArrIdx,
+				})
+			}
+
+			rReceivers = append(rReceivers, runtime.ReceiverConnectionSide{
+				Port: receiverPort,
+				Meta: runtime.ReceiverConnectionSideMeta{
+					PortAddr:  receiverPortAddr,
+					Selectors: selectors,
+				},
+			})
+		}
+
+		rConns = append(rConns, runtime.Connection{
+			Sender:    rSenderConnSide,
+			Receivers: rReceivers,
+		})
+	}
+
+	return runtime.Program{
+		Ports:       rPorts,
+		Connections: rConns,
+		Funcs:       []runtime.FuncRoutine{},
+	}, nil
+}
diff --git a/internal/runtime/connector.go b/internal/runtime/connector.go
index 6e64320e..7f12f446 100644
--- a/internal/runtime/connector.go
+++ b/internal/runtime/connector.go
@@ -24,9 +24,9 @@ func NewConnector(interceptor Interceptor) Connector {
 }
 
 type Interceptor interface {
-	AfterSending(from ConnectionSideMeta, msg Msg) Msg
-	BeforeReceiving(from, to ConnectionSideMeta, msg Msg) Msg
-	AfterReceiving(from, to ConnectionSideMeta, msg Msg)
+	AfterSending(from SenderConnectionSideMeta, msg Msg) Msg
+	BeforeReceiving(from, to SenderConnectionSideMeta, msg Msg) Msg
+	AfterReceiving(from, to SenderConnectionSideMeta, msg Msg)
 }
 
 func (c DefaultConnector) Connect(ctx context.Context, conns []Connection) error { // pass ports map here?
diff --git a/internal/runtime/program.go b/internal/runtime/program.go
index d158b551..7b9f9bb1 100644
--- a/internal/runtime/program.go
+++ b/internal/runtime/program.go
@@ -27,12 +27,12 @@ func (p PortAddr) String() string {
 type Ports map[PortAddr]chan Msg
 
 type Connection struct {
-	Sender    ConnectionSide
-	Receivers []ConnectionSide
+	Sender    SenderConnectionSide
+	Receivers []ReceiverConnectionSide
 }
 
 func (c Connection) String() string {
-	s := c.Sender.Meta.String() + "->"
+	s := c.Sender.PortAddr.String() + "->"
 	for i := range c.Receivers {
 		s += c.Receivers[i].Meta.String()
 		if i < len(c.Receivers)-1 {
@@ -42,17 +42,26 @@ func (c Connection) String() string {
 	return s
 }
 
-type ConnectionSide struct {
+type SenderConnectionSide struct {
 	Port chan Msg
-	Meta ConnectionSideMeta
+	SenderConnectionSideMeta
 }
 
-type ConnectionSideMeta struct {
+type ReceiverConnectionSide struct {
+	Port chan Msg
+	Meta ReceiverConnectionSideMeta
+}
+
+type SenderConnectionSideMeta struct {
+	PortAddr PortAddr
+}
+
+type ReceiverConnectionSideMeta struct {
 	PortAddr  PortAddr
 	Selectors []Selector
 }
 
-func (c ConnectionSideMeta) String() string {
+func (c ReceiverConnectionSideMeta) String() string {
 	return c.PortAddr.String()
 }
 
diff --git a/internal/shared/lowlevel.go b/internal/shared/lowlevel.go
index c4080d43..7dd1a096 100644
--- a/internal/shared/lowlevel.go
+++ b/internal/shared/lowlevel.go
@@ -13,11 +13,11 @@ type LLPortAddr struct {
 }
 
 type LLConnection struct {
-	SenderSide    LLConnectionSide
-	ReceiverSides []LLConnectionSide
+	SenderSide    LLPortAddr
+	ReceiverSides []LLReceiverConnectionSide
 }
 
-type LLConnectionSide struct {
+type LLReceiverConnectionSide struct {
 	PortAddr  LLPortAddr
 	Selectors []LLSelector
 }