Senior Fullstack Developer (Java)

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 will join a multidisciplinary engineering team working on real time multiplayer and single player gaming platforms. This role is ideal for a developer with a strong Java background who can work confidently across backend services, frontend integrations, and supporting tools. A genuine fullstack engineer who can take ownership of features end to end.

As a Senior Fullstack Developer (Java), you will work across multiple components of our distributed platform, contributing to both backend microservices and web clients. You will collaborate closely with frontend engineers, game logic developers, and product managers to design and deliver secure, performant, and maintainable solutions.

The ideal candidate is a versatile developer who can navigate backend systems, network integrations, frontend logic, and debugging across the stack.

Key Responsibilities:

• Design and develop backend services in Java 17+ using Spring Boot and Maven

• Build and maintain microservice integrations across authentication, payments, chat, and gameplay

• Implement and maintain REST and WebSocket APIs for game logic and real time communication

• Integrate frontend clients (Dart, TypeScript, or similar) with backend systems

• Develop and support integrations with third party platforms, payment gateways, and cashier services

• Collaborate with product and backend teams to ensure seamless transaction management, wallet synchronisation, and player balance handling

• Contribute to frontend modules where needed, supporting UI logic and state synchronisation

• Collaborate on data modelling, schema design, and optimisation

• Participate in code reviews, debugging, and performance optimisation

• Ensure scalability, data consistency, and high availability across distributed systems

About You:

• Strong proficiency in Java (17+) and Spring Boot

• Experience integrating with payment systems, third party APIs, or cashier services

• Familiarity with WebSocket communication and real time data exchange

• Solid understanding of REST API design and microservice architecture

• Experience with SQL databases, schema design, and query optimisation

• Exposure to frontend development (Dart preferred, or JavaScript/TypeScript)

• Knowledge of containerised environments (Docker) and CI/CD pipelines

• Comfortable working in a multi repository, multi module setup

• Understanding of state management, protocol-based communication, and client server synchronisation

• Experience in real time multiplayer or financial transaction systems

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.