Backend Engineer Málaga

Sports Staff Backend Engineer (Performance & Scalability)

In Sports book we work in a high-volume, real-time environment, integrating data feeds with our modern trading system and transactional betting platform (UI/Backend). Your contributions will cover maintaining/expanding our current Betting/Trading services acting as a hands-on technical consultant and mentor to other engineering teams, helping them solve their toughest performance and scalability challenges.

We are recruiting the best Staff Backend Engineer, Performance & Scalability for our

Sports Engineering Team!

Join our team as a Staff Software Engineer, Performance & Scalability position and play a crucial role in driving our organisation's growth through the development of outstanding products. You will be part of the SPORTS ARCHITECTURE & TECHNICAL EXCELLENCE group reporting directly to the Director of Sports Engineering and working closely with Principal Architects and Principal Engineers.

Leo Vegas Group is building something special – a world-class team dedicated to creating the best Sports book platform in the market through cutting-edge technology and innovative gaming experiences.

This is a dynamic team that will be working on creating new cool features and integrating them into Leo Vegas platforms.

We’re seeking a dynamic individual who can deliver state-of-the-art code while prioritising performance and scalability.

As a key member of our team, you’ll collaborate effectively while also demonstrating initiative and a passion for sharing innovative ideas.

• Act as a hands-on technical consultant and mentor to other engineering teams, helping them solve their toughest performance and scalability challenges.
• Define and drive the adoption of a scalable performance testing strategy and tooling across the organization, enabling teams to own their performance.
• Work side by side with Principal Architects and Principal Engineers using state-of-the-art technology stack and deliver features in our microservice ecosystem.
• As a Staff developer you will have a key role in owning delivery plans and aligning the product importance of reducing technical debt and prioritising platform initiatives.
• Identify obstacles to ensure quality and improve our user experience and how we build our products.
• Work with product managers, architects, QA engineers, and other developers in a highly collaborative agile environment.
• Build for scale, availability, performance and security across the stack.

• 8+ years of software development experience with Java, Spring Boot and Event-Driven Architectures.
• Familiarity with Reactive Programming.
• Demonstrable, hands-on experience in performance analysis, profiling, and tuning of high-throughput, low-latency systems (e.g., garbage collection analysis, asynchronous patterns).
• Deep expertise in designing and implementing load testing strategies and familiarity with modern tooling.
• A strong understanding of observability principles and tooling for distributed systems (e.g., distributed tracing with Open Telemetry, advanced metrics with Prometheus).
• Proven ability to design, review, and enforce non-blocking end-to-end flows in reactive systems (event-loop discipline, worker isolation, back pressure, async drivers).
• Deep understanding of event-loop vs worker execution models, including failure modes (hidden blocking, context leaks, scheduler misuse).
• Hands-on experience debugging live performance incidents in distributed systems (CPU saturation, GC storms, tail latency explosions, noisy neighbors).
• Ability to form and validate performance hypotheses under incomplete data, using production-safe techniques.
• Deep JVM knowledge: allocation profiling, escape analysis, JIT behavior, safepoints, memory layout trade-offs.
• Experience tuning JVMs for low-latency and high-throughput workloads (heap sizing, region sizing, pause vs throughput trade-offs).
• Ability to design realistic load models (traffic shape, burstiness, fan-out, data skew) rather than synthetic steady-state tests.
• Proven track record of making pragmatic trade-offs between performance,…