**About Block Labs** ==================== Block Labs is a leading force in the Web3 space, incubating, investing in, and accelerating top\-tier fintech, crypto, and iGamingprojects. With a mission to shape the future of decentralized technology, we partner with visionary startups to raise funding, refine product\-market fit, and grow their audiences. As we continue to expand, we are looking for an ambitious and self\-drivenindividual to join our rapidly growing team! **About The Role** ================== You’ll join a high\-performing engineering team that values ownership, strong fundamentals, and pragmatic solutions. This role is ideal for a backend developer eager to work on large\-scale, real\-time gaming systems supporting both multiplayer and single\-player experiences. As a **Senior Backend Game Developer (Java)**, you will design and implement core services that support our multiplayer and single player gaming platforms. You will work with a modular Java architecture based on Spring Boot and handle areas such as user management, wallet systems, rake calculations, and real time communication. You will also use **Drools** for rule\-based decision logic, managing game outcomes, bonuses, and dynamic event triggers within a scalable and testable structure. **Key Responsibilities:** ========================= * Build and maintain backend modules for **user, wallet, and gameplay services**, ensuring consistency and high performance. * Implement **REST and custom protocol endpoints** for clients and partners. * Design and optimize **database** schemas and manage migrations with **Flyway**. * Ensure **transaction integrity** with **JTA/Atomikos** for wallet and reward systems. * Improve system scalability using **Spring Boot**, **Infinispan**, and **Quartz Scheduler**. * Write robust, testable code with **JUnit 5** and participate in reviews and CI/CD pipelines. * Collaborate cross\-functionally with Product, **Frontend, and QA** teams to deliver reliable releases. **About You:** ============== * 5\+ years of backend development experience with **Java (17–21\)**. * Strong expertise in **Spring Boot**, **Maven**, and **SQL database design**. * Experience with **distributed systems**, **multi\-threading**, and **containerised environments**. * Familiarity with **real\-time multiplayer or gaming backends** (matchmaking, wallet logic, scoring). * Knowledge of **REST APIs**, **microservice architecture**, and **network communication**. Experience with **Infinispan**, **Quartz Scheduler**, or **Apache MINA**, and an understanding of payment processing, commission/rake models, and gaming compliance. **What kind of culture can I expect?** Mature, mission\-driven, and low\-ego. We value clarity over noise, outcomes over theatrics, and pace without chaos. If you’re one of the smartest minds in your craft and want to build with other experts, you’ll feel at home here.