Back-end Developer

Trách nhiệm công việc Develop and maintain backend systems for gamifications. Design, build, and optimize APIs and server systems to handle millions of daily requests Integrate backend services such as authentication, payment, leaderboard, chat, matchmaking, and in-game events. Collaborate closely with frontend/game client teams to ensure performance and player experience Optimize server performance, scalability, and high concurrency handling. Write technical documentation and follow software development processes (code review, CI/CD) Kỹ năng & Chuyên môn At least 1 year of experience for Junior level, or 3+ years of experience for Middle level. Proficient in one of: Node.js (Fastify), Go (Fiber), or Java. Experience with API gateway tools: Kong, KrakenD, or Express Gateway. Knowledge of real-time communication: Socket.IO, NATS, MQTT, or Redis pub-sub. Familiarity with microservice frameworks: NestJS or Go (microservices). Experience with authentication & authorization: Keycloak (OpenID) + JWT. Phúc lợi dành cho bạn Salary: Negotiable, up to $600 VND (for Junior) and $1,100 (for Middle) Social and health insurance according to current labor laws. Provided with MacBook and all necessary office supplies. Modern and professional working environment. 14 days of paid annual leave Holiday, Tet, and birthday bonuses in accordance with company policies. Working hours: Monday to Friday weekly:  Morning: 08:30 to 12:00 Afternoon: 13:00 to 17:30