diff --git a/.gitignore b/.gitignore
index 66fd13c..0b5248f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
-# Binaries for programs and plugins
-*.exe
+# Binaries
+devmode-extender_*
 *.exe~
 *.dll
 *.so
@@ -12,4 +12,7 @@
 *.out
 
 # Dependency directories (remove the comment below to include it)
-# vendor/
+vendor/
+
+# IDE files.
+.idea
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..5ff9e3a
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,16 @@
+FROM debian:stable-slim
+
+RUN apt-get update && \
+    apt-get -y --no-install-recommends install make binutils upx-ucl wget gcc-arm-linux-gnueabihf software-properties-common && \
+    add-apt-repository "deb http://httpredir.debian.org/debian sid main" && \
+    apt-get update && \
+    apt-get -t sid install -y --no-install-recommends golang-1.17-go && \
+    apt clean && \
+    rm -rf /var/lib/apt && \
+    rm -rf /var/lib/dpkg
+
+RUN wget https://github.com/tinygo-org/tinygo/releases/download/v0.21.0/tinygo_0.21.0_amd64.deb \
+    && dpkg -i tinygo_0.21.0_amd64.deb \
+    && rm tinygo_0.21.0_amd64.deb
+
+ENV PATH="/usr/lib/go-1.17/bin/:$PATH"
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..20e76aa
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,32 @@
+SHELL = /bin/bash -o pipefail
+export PATH := $(shell go env GOPATH)/bin:$(PATH)
+
+ROOT_DIR=$(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
+BIN=$(ROOT_DIR)/devmode-extender
+
+all:
+	@docker-compose run --rm app
+
+build: deps fmt
+	@echo "> Building"
+	# TODO: TinyGo has problems with the arm crosscompilation. See this: https://github.com/tinygo-org/tinygo/issues/1906
+	#@CGO_ENABLED=0 GOOS=linux GOARCH=arm tinygo build -o $(BIN)_arm .  && strip $(BIN)_arm && upx -9 $(BIN)_arm
+	@CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -ldflags="-s -w" -o $(BIN)_arm . && upx -9 $(BIN)_arm
+	@echo $(BIN)_arm
+	# TODO: TinyGo has problems with the arm crosscompilation. See this: https://github.com/tinygo-org/tinygo/issues/1906
+	#@CGO_ENABLED=0 GOOS=linux GOARCH=arm64 tinygo build -o $(BIN)_arm64 .  && strip $(BIN)_arm64 && upx -9 $(BIN)_arm64
+	@CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -o $(BIN)_arm64 . && upx -9 $(BIN)_arm64
+	@echo $(BIN)_arm64
+	@CGO_ENABLED=0 GOOS=windows GOARCH=386 go build -ldflags="-s -w" -o $(BIN)_386.exe . && upx -9 $(BIN)_386.exe
+	@echo $(BIN)_386.exe
+	@CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags="-s -w" -o $(BIN)_amd64.exe . && upx -9 $(BIN)_amd64.exe
+	@echo $(BIN)_amd64.exe
+
+fmt:
+	@echo "> gofmt"
+	@gofmt -l -s -w `go list -f '{{.Dir}}' ${ROOT_DIR}/... | grep -v /vendor/`
+
+deps:
+	@echo "> Dependencies"
+	@go mod tidy
+	@go mod vendor
diff --git a/README.md b/README.md
index ba70a60..f311fdb 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,12 @@
-# lg-webos-devmode-timer-extender
+# LG WebOS Developer Mode Extender
 This app can extend developer mode timer for the LG TV (you'll need the session token for that)
+
+You can obtain the developer mode session token by logging into your TV and executing this command:
+
+```shell
+cat /var/luna/preferences/devmode_enabled
+```
+
+## Building
+
+Run `make all`. You will need Docker for that.
diff --git a/api/client.go b/api/client.go
new file mode 100644
index 0000000..4047829
--- /dev/null
+++ b/api/client.go
@@ -0,0 +1,63 @@
+package api
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+const BaseURL = "https://developer.lge.com/secure"
+
+type Client struct {
+	client *http.Client
+	token  string
+}
+
+func New(token string) *Client {
+	return &Client{
+		client: &http.Client{Timeout: time.Second * 10},
+		token:  token,
+	}
+}
+
+func (c *Client) call(method string, target interface{}) (err error) {
+	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/%s.dev?sessionToken=%s", BaseURL, method, c.token), nil)
+	if err != nil {
+		return err
+	}
+
+	res, err := c.client.Do(req)
+	if err != nil {
+		return err
+	}
+
+	defer res.Body.Close()
+
+	err = json.NewDecoder(res.Body).Decode(target)
+	return
+}
+
+func (c *Client) Query() (timeLeft string, err error) {
+	var res Response
+	if err = c.call("CheckDevModeSession", &res); err != nil {
+		return
+	}
+	if res.Failed() {
+		err = res.Error()
+		return
+	}
+	return res.ErrorMsg, nil
+}
+
+func (c *Client) Extend() (err error) {
+	var res Response
+	if err = c.call("ResetDevModeSession", &res); err != nil {
+		return
+	}
+	if res.Failed() || !res.ResetIsSuccessful() {
+		err = res.Error()
+		return
+	}
+	return
+}
diff --git a/api/response.go b/api/response.go
new file mode 100644
index 0000000..f232a13
--- /dev/null
+++ b/api/response.go
@@ -0,0 +1,31 @@
+package api
+
+import (
+	"errors"
+	"fmt"
+)
+
+type Response struct {
+	Result    string `json:"result,omitempty"`
+	ErrorCode string `json:"errorCode,omitempty"`
+	ErrorMsg  string `json:"errorMsg,omitempty"`
+}
+
+func (b Response) Failed() bool {
+	return b.Result == "fail"
+}
+
+func (b Response) Succeeded() bool {
+	return b.Result == "success" && b.ErrorCode == "200"
+}
+
+func (b Response) Error() error {
+	if b.Failed() {
+		return errors.New(fmt.Sprintf("%s: %s", b.ErrorCode, b.ErrorMsg))
+	}
+	return nil
+}
+
+func (b Response) ResetIsSuccessful() bool {
+	return b.Succeeded() && b.ErrorMsg == "GNL"
+}
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..e436a5c
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,11 @@
+version: "3"
+
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      - ./:/app
+    working_dir: "/app"
+    command: "make build"
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..f1d03d5
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/Neur0toxine/lg-webos-devmode-timer-extender
+
+go 1.17
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..e69de29
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..b8ad6d0
--- /dev/null
+++ b/main.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	"log"
+	"os"
+	"strings"
+
+	"github.com/Neur0toxine/lg-webos-devmode-timer-extender/api"
+)
+
+const TokenParam = "--token="
+
+func main() {
+	token := getTokenArg()
+	if token == "" {
+		log.Println("Usage:")
+		log.Printf("$ %s %stoken\n", os.Args[0], TokenParam)
+		os.Exit(1)
+	}
+
+	client := api.New(token)
+	timeLeft, err := client.Query()
+	if err != nil {
+		log.Fatalln("Cannot query devmode status:", err)
+	}
+
+	log.Println("Time left before resetting:", timeLeft)
+
+	if err := client.Extend(); err != nil {
+		log.Fatalln("Cannot extend devmode timer:", err)
+	}
+
+	timeLeft, err = client.Query()
+	if err != nil {
+		log.Fatalln("Cannot query devmode status again:", err)
+	}
+
+	log.Println("Time left after resetting:", timeLeft)
+}
+
+func getTokenArg() string {
+	if len(os.Args) != 2 {
+		return ""
+	}
+
+	if !strings.HasPrefix(os.Args[1], TokenParam) {
+		return ""
+	}
+
+	return strings.TrimSpace(os.Args[1][len(TokenParam):])
+}