Senior Backend Developer (Java) - Mobile Game Platform

UserWise Services

Lahore, Punjab, Pakistan permanent

Posted: April 27, 2026

Required Skills

Job Description

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

Requirements:
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.

2) 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.

3) 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.

4) 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.

5) 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).

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

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