Senior Fullstack Engineer

Role Description

We are seeking a talented Senior Fullstack Engineer to join X-FLOW’s flagship mobile game project, Happy Color. In this role you will take ownership of end-to-end feature delivery, from designing and developing RESTful APIs with PHP/Laravel to building high-performance frontend applications using TypeScript and React. You will collaborate closely with product managers, designers and QA to define and maintain clear API contracts, integrate with external services, optimize performance through profiling and latency reduction, and ensure production reliability by implementing logging, metrics, alerts and traces. You will also design scalable database schemas, handle migrations, indexing and query optimization, write unit, integration and end-to-end tests, conduct code reviews, automate quality checks, and participate in architectural discussions to shape the platform’s future.

Why Join Us

At X-FLOW you will work in a dynamic, creative GameDev environment on one of the most popular mobile titles worldwide. We offer a competitive salary range up to 8 000 EUR, flexible hybrid work in Cyprus (remote/office), and a supportive culture that values diversity and innovation. You will have ample opportunities for career growth, professional development and mentoring, access to internal training programs, and the freedom to experiment with cutting-edge technologies like Kafka, ClickHouse and observability tools (Prometheus, Grafana, OpenTelemetry).

About X-FLOW

Founded in 2018, X-FLOW is a rapidly growing mobile game development studio with offices and partners across the UK, Cyprus and the Netherlands. Our flagship title, Happy Color, has been downloaded millions of times and continues to engage users with vibrant puzzles and community-driven content. We believe in a fun, inclusive culture where every team member’s voice matters. Join us to make an impact on a global audience and help build the next generation of hit mobile games.