diff --git a/cmd/observ.go b/cmd/observ.go
index b1d6fe0..4229758 100644
--- a/cmd/observ.go
+++ b/cmd/observ.go
@@ -3,14 +3,25 @@ package main
 import (
 	"net/http"
 
+	"git.mak-sim.ru/maksim/observability_2025/internal/logger"
 	"github.com/go-chi/chi/v5"
+	"go.uber.org/zap"
 )
 
 func main() {
+	logger, err := logger.GetLogger(false)
+	if err != nil {
+		panic(err)
+	}
 	r := chi.NewRouter()
 
 	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte("welcome")) //nolint:errcheck
+		_, err := w.Write([]byte("welcome"))
+		if err != nil {
+			logger.Error("Error writing response", zap.Error(err))
+		}
 	})
+
+	logger.Info("Server started")
 	http.ListenAndServe(":8080", r) //nolint:errcheck
-}
\ No newline at end of file
+}
diff --git a/go.mod b/go.mod
index d53b17f..433c8c6 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,9 @@ module git.mak-sim.ru/maksim/observability_2025
 
 go 1.24.1
 
-require github.com/go-chi/chi/v5 v5.2.3
+require (
+	github.com/go-chi/chi/v5 v5.2.3
+	go.uber.org/zap v1.27.1
+)
+
+require go.uber.org/multierr v1.10.0 // indirect
diff --git a/go.sum b/go.sum
index 5bd7be3..af0e0bd 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,16 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-chi/chi/v5 v5.2.3 h1:WQIt9uxdsAbgIYgid+BpYc+liqQZGMHRaUwp0JUcvdE=
 github.com/go-chi/chi/v5 v5.2.3/go.mod h1:L2yAIGWB3H+phAw1NxKwWM+7eUH/lU8pOMm5hHcoops=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
+github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
+go.uber.org/multierr v1.10.0 h1:S0h4aNzvfcFsC3dRF1jLoaov7oRaKqRGC/pUEJ2yvPQ=
+go.uber.org/multierr v1.10.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
+go.uber.org/zap v1.27.1 h1:08RqriUEv8+ArZRYSTXy1LeBScaMpVSTBhCeaZYfMYc=
+go.uber.org/zap v1.27.1/go.mod h1:GB2qFLM7cTU87MWRP2mPIjqfIDnGu+VIO4V/SdhGo2E=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=