diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..b2ee155
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,16 @@
+module orderservice
+
+go 1.24.8
+
+require (
+	github.com/google/uuid v1.6.0
+	google.golang.org/grpc v1.76.0
+	google.golang.org/protobuf v1.36.10
+)
+
+require (
+	golang.org/x/net v0.42.0 // indirect
+	golang.org/x/sys v0.34.0 // indirect
+	golang.org/x/text v0.27.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250804133106-a7a43d27e69b // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..d45f305
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,36 @@
+github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
+github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+go.opentelemetry.io/otel v1.37.0 h1:9zhNfelUvx0KBfu/gb+ZgeAfAgtWrfHJZcAqFC228wQ=
+go.opentelemetry.io/otel v1.37.0/go.mod h1:ehE/umFRLnuLa/vSccNq9oS1ErUlkkK71gMcN34UG8I=
+go.opentelemetry.io/otel/metric v1.37.0 h1:mvwbQS5m0tbmqML4NqK+e3aDiO02vsf/WgbsdpcPoZE=
+go.opentelemetry.io/otel/metric v1.37.0/go.mod h1:04wGrZurHYKOc+RKeye86GwKiTb9FKm1WHtO+4EVr2E=
+go.opentelemetry.io/otel/sdk v1.37.0 h1:ItB0QUqnjesGRvNcmAcU0LyvkVyGJ2xftD29bWdDvKI=
+go.opentelemetry.io/otel/sdk v1.37.0/go.mod h1:VredYzxUvuo2q3WRcDnKDjbdvmO0sCzOvVAiY+yUkAg=
+go.opentelemetry.io/otel/sdk/metric v1.37.0 h1:90lI228XrB9jCMuSdA0673aubgRobVZFhbjxHHspCPc=
+go.opentelemetry.io/otel/sdk/metric v1.37.0/go.mod h1:cNen4ZWfiD37l5NhS+Keb5RXVWZWpRE+9WyVCpbo5ps=
+go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mxVK7z4=
+go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
+golang.org/x/net v0.42.0 h1:jzkYrhi3YQWD6MLBJcsklgQsoAcw89EcZbJw8Z614hs=
+golang.org/x/net v0.42.0/go.mod h1:FF1RA5d3u7nAYA4z2TkclSCKh68eSXtiFwcWQpPXdt8=
+golang.org/x/sys v0.34.0 h1:H5Y5sJ2L2JRdyv7ROF1he/lPdvFsd0mJHFw2ThKHxLA=
+golang.org/x/sys v0.34.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/text v0.27.0 h1:4fGWRpyh641NLlecmyl4LOe6yDdfaYNrGb2zdfo4JV4=
+golang.org/x/text v0.27.0/go.mod h1:1D28KMCvyooCX9hBiosv5Tz/+YLxj0j7XhWjpSUF7CU=
+gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
+gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250804133106-a7a43d27e69b h1:zPKJod4w6F1+nRGDI9ubnXYhU9NSWoFAijkHkUXeTK8=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250804133106-a7a43d27e69b/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
+google.golang.org/grpc v1.76.0 h1:UnVkv1+uMLYXoIz6o7chp59WfQUYA2ex/BXQ9rHZu7A=
+google.golang.org/grpc v1.76.0/go.mod h1:Ju12QI8M6iQJtbcsV+awF5a4hfJMLi4X0JLo94ULZ6c=
+google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
+google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..83c9d69
--- /dev/null
+++ b/main.go
@@ -0,0 +1,113 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"log"
+	"net"
+	"sync"
+
+	pb "orderservice/pkg/api/test"
+
+	"github.com/google/uuid"
+	"google.golang.org/grpc"
+)
+
+var (
+	OrderNotFoundErr = errors.New("order not found")
+)
+
+type OrderServiceServer struct {
+	pb.UnimplementedOrderServiceServer
+	mu     sync.Mutex
+	orders map[string]*pb.Order
+}
+
+func NewOrderServiceServer() *OrderServiceServer {
+	return &OrderServiceServer{
+		orders: make(map[string]*pb.Order),
+	}
+}
+
+func (s *OrderServiceServer) CreateOrder(ctx context.Context, req *pb.CreateOrderRequest) (*pb.CreateOrderResponse, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	id := uuid.New().String()
+	order := &pb.Order{
+		Id:       id,
+		Item:     req.Item,
+		Quantity: req.Quantity,
+	}
+	s.orders[id] = order
+
+	return &pb.CreateOrderResponse{Id: id}, nil
+}
+
+func (s *OrderServiceServer) GetOrder(ctx context.Context, req *pb.GetOrderRequest) (*pb.GetOrderResponse, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	order, ok := s.orders[req.Id]
+	if !ok {
+		return nil, OrderNotFoundErr
+	}
+
+	return &pb.GetOrderResponse{Order: order}, nil
+}
+
+func (s *OrderServiceServer) UpdateOrder(ctx context.Context, req *pb.UpdateOrderRequest) (*pb.UpdateOrderResponse, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	order, ok := s.orders[req.Id]
+	if !ok {
+		return nil, OrderNotFoundErr
+	}
+
+	order.Item = req.Item
+	order.Quantity = req.Quantity
+
+	return &pb.UpdateOrderResponse{Order: order}, nil
+}
+
+func (s *OrderServiceServer) DeleteOrder(ctx context.Context, req *pb.DeleteOrderRequest) (*pb.DeleteOrderResponse, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	_, ok := s.orders[req.Id]
+	if !ok {
+		return nil, OrderNotFoundErr
+	}
+
+	delete(s.orders, req.Id)
+
+	return &pb.DeleteOrderResponse{Success: true}, nil
+}
+
+func (s *OrderServiceServer) ListOrders(ctx context.Context, req *pb.ListOrdersRequest) (*pb.ListOrdersResponse, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	orders := make([]*pb.Order, 0, len(s.orders))
+	for _, o := range s.orders {
+		orders = append(orders, o)
+	}
+
+	return &pb.ListOrdersResponse{Orders: orders}, nil
+}
+
+func main() {
+	lis, err := net.Listen("tcp", ":50051")
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+
+	s := grpc.NewServer()
+	pb.RegisterOrderServiceServer(s, NewOrderServiceServer())
+
+	log.Printf("server listening at %v", lis.Addr())
+	if err := s.Serve(lis); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+}