Senior Java Developer

Rabbit Games aims to become the preferred co-development game studio for developers and publishers across the globe. Leveraging our extensive expertise in PC, mobile and console titles, we strive to co-develop some of the world’s leading gaming brands. Our international and diverse team endeavours to create gaming experiences that leave a lasting impact on players.

We excel not only in the development of Soulslike, PVP, Co-op shooters and RPG games, but we also have a genuine passion for playing them.

We are looking for Senior Java Developer - Mobile Online Shooter Backend .

For which tasks (responsibilities)?

We're developing a mobile online shooter game built on Unity, requiring a robust and scalable backend infrastructure to support thousands of concurrent players, real-time matchmaking, and seamless gameplay experience across devices.

What kind of professional are we looking for?

• Design and implement high-performance backend services for our mobile shooter

• Develop and maintain critical game systems: matchmaking, leaderboards, player profiles, in-game purchases

• Optimize system performance

• Ensure backend security against cheating and exploits

• Collaborate with Unity developers to integrate client-server solutions

• Participate in code reviews and maintain high code quality standards

Requirements

• 7+ years of commercial Java development experience (Java 17+)

• Strong knowledge of Spring Framework ecosystem (Spring Boot, Spring Cloud)

• Experience with high-load distributed systems and microservices architecture

• Proficiency in working with SQL and NoSQL databases (MongoDB, PostgreSQL, Redis)

• Experience with concurrent and asynchronous programming in Java

• Familiarity with CI/CD practices and containerization (Docker, Kubernetes)

• Ability to write clean, maintainable, and well-tested code

• Strong problem-solving skills and attention to detail

• English: B2 or higher

Nice to Have

• Experience with Kotlin and interest in gradual codebase migration

• Knowledge of actor-based frameworks (Akka, Vert.x) for concurrent processing

• Familiarity with game server architecture and online gaming challenges

• Experience with WebSockets

• Understanding of game development principles

• Experience with cloud platforms (AWS, Azure, GCP)

• Knowledge of authentication and authorization mechanisms

What are the conditions and bonuses?

• Remote, hybrid or onsite work in Poznan or Warsaw (Poland)

• B2B

• Paid leave: 20 days per year

• Sick leave 5 days per year

• Start your workday anytime between 9am to 12pm

• Co-financing of sport cards