Senior Back End Developer

London/Hybrid (2 office days)


Contribute to the development of the FSB platform. FSB has a wide range of clients operating in the competitive online betting marketplace. As a Back End Developer,

you will be responsible for creating, maintaining, testing, and debugging the back end of our applications and/or systems.

Key Responsibilities

• Develop high-volume, low-latency programs for mission-critical systems, delivering high-availability and performance.

• Be involved in the design process of programs, working closely with architects.

• Assist with release management, capacity planning and emergency response as an expert of the runtime environment and business logic behaviour.

• Give input and contribute to monitoring & alerting requirements and implementation.

• Prepare and perform releases of software components.

• Help develop & maintain your team CI/CD needs.

• Support continuous improvement by investigating alternative technologies and presenting these for architectural review.

• Serve as mentor/coach to more junior team members. Positively impact the team skills by imparting your wealth of knowledge to the team and learn along the way.

• Translate non-technical and technical requirements to appropriate audiences.


• 5+ years of Java development experience, strong interest in problem solving, strong analytical skills & independence.

• Good understanding of JVM, including analysing performance problems and finding.

• Good understanding of design & architecture in OO software technologies.

• Understanding of building and deploying of large scale system.

• Experience in developing highly scalable REST microservices for Java platform.

• Spring framework experience Core, Spring Data, Spring Boo.

• Experience with NoSQL technologies ( Redis or other in-memory data stores).

• Strong understanding of core Java, optimization opportunities (ability to read GC logs, GC tuning, memory usage...).

• Distributed computing: Load balancing, Caching, CAP theorem.

• Experience with managing high load performance applications: monitoring on all layers from CPU to application metrics.

• Understanding of common design patterns.

Desirable Requirements

• Hands on Linux experience.

• Experience with monitoring & logging technologies.

• Experience with infrastructure technologies. (GPC, AWS, k8s, Terraform, Docker...)

• BS/MS degree (or equivalent) in Computer Science, Engineering or a related subject

• Experience working with pub/sub/messaging systems (Kafka, ActiveMQ...)

• Push technologies (Websockets)

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