Senior Backend Developer (Java) - Mobile Game Platform

About the Role

We are hiring a Senior Backend Developer to maintain and extend the backend for a live mobile game (Cocos C++ client + Java services). You will work on gameplay APIs, player data integrity, ranking systems, payments, and platform services in a high-traffic production environment.

What Success Looks Like

• You can safely ship new game operations without breaking existing client contracts.
• You improve reliability of account data and ranking flows under real player load.
• You reduce incident risk in transfer/payment paths through stronger validation and observability.

How to Apply

Please share

• Resume and LinkedIn/GitHub profile
• Relevant backend project examples (especially game or high-scale transactional systems)
• Brief note describing your experience with Spring MVC + MyBatis + Redis

What You’ll Work On

• Build and maintain Java backend services that power core gameplay and account flows.
• Implement and evolve request handlers behind the game protocol endpoint (`/bnb/operation`) using `requestKey` dispatching.
• Own data consistency across MySQL + Redis, including transactional and partial-failure edge cases.
• Extend ranking, activity, and account transfer systems used by live players.
• Integrate and support payment verification flows (Google Play / iOS / PayPal).
• Collaborate with client engineers by tracing C++ network behavior and shared JSON contracts.

Required Technical Skills

1. Java & Frameworks

• Strong Java 11 experience in production systems.
• Spring MVC (XML-based configuration), Spring Security, Spring JDBC/Tx.
• MyBatis (annotation-driven DAO patterns), not JPA/Hibernate.
• Maven multi-module project experience.

1. Networking & API Contract

• Deep understanding of HTTP/HTTPS API design and production debugging.
• Experience with JSON-based messaging (Fastjson/Jackson/Gson interoperability).
• Ability to work with command-style API routing (single endpoint + operation key) rather than conventional REST resource routing.
• Familiarity with gzip-compressed request/response handling.

1. Database & Caching

• MySQL schema design and performance tuning.
• Redis (Jedis), including sorted sets, TTL patterns, and cache invalidation.
• Confidence handling consistency between relational DB writes and Redis updates.

1. Game Backend Domain Skills

• Leaderboards, player progression data, event systems, and anti-cheat validation logic.
• Handling high-frequency state updates and large player-state payloads safely.
• Idempotency, concurrency control, and rollback strategy for critical flows.

1. Legacy / Cross-Stack Collaboration

• Ability to read C++ code to understand client request construction and field contracts.
• Comfortable debugging cross-language issues between Cocos C++ client and Java backend.

Nice to Have

• Experience with legacy Spring MVC modernization.
• Prior migration of old connection pools (e.g., BoneCP) to HikariCP.
• Experience with Google App Engine or similar cloud runtimes.
• Experience with distributed locking (Redis / ZooKeeper/Curator).

• Market competitive, tax-free USD salaries
• Paid Time Off
• Medical Health Insurance
• Performance Bonus
• Annual Performance Reviews