Staff Backend Engineer - Sports Engineering

Our requirements

• Proven experience designing, building and operating distributed systems at scale, owning complex backend systems end-to-end in production.
• Strong backend expertise in Java (preferably 21+), with a solid understanding of JVM internals, concurrency and multithreading.
• Hands-on experience with Reactive Programming and non-blocking systems using Spring Boot and/or Vert.x.
• Hands-on experience with Apache Kafka and event-driven architectures; familiarity with streaming and messaging technologies such as Redis or NATS.
• Experience with Redis for caching and low-latency data access, and with SQL and NoSQL databases (e.g. PostgreSQL, MariaDB, MongoDB).
• Experience with observability and monitoring platforms such as Datadog, Grafana or Kibana, and with debugging complex production incidents.
• Strong system design and architectural decision-making, balancing latency, throughput, consistency, operational complexity and maintainability.
• Ability to influence technical decisions and communicate effectively with engineers, architects, product managers and other stakeholders.

Optional

• Experience with Kubernetes, AWS and/or GCP, and cloud-native architecture patterns.
• Experience with OpenSearch and/or Elasticsearch for search, analytics and operational troubleshooting.
• Experience building internal platforms, shared frameworks or developer productivity tooling, with a strong SRE mindset.
• Experience within sports betting, gaming or other real-time, data-intensive domains.

Your responsibilities

• Lead architecture and design discussions for scalable, resilient and maintainable distributed systems, evaluating options through spikes, experiments and proofs of concept.
• Drive simplification of complex systems while holding a high bar for performance, reliability and code quality.
• Identify scalability, resiliency and operational risks before they reach production, and lead root cause analysis when incidents occur.
• Improve observability, monitoring and operational readiness, and drive down technical debt across the platform.
• Promote best practices around event-driven and reactive architectures, performance optimisation, testing, automation and CI/CD.
• Mentor engineers through design reviews, code reviews, pair programming and technical guidance.
• Partner with Product, Engineering Managers and Architects to translate business problems into practical solutions, and help shape and break down technical initiatives.
• Contribute to a culture of ownership, collaboration, continuous improvement and engineering excellence.

About the project

This is how we organize our work

This is how we work on a project

• Clean Code
• code review
• design patterns
• DDD
• pair programming
• architect / technical leader support
• Continuous Deployment
• Continuous Integration
• DevOps
• team-level deployment
• active monitoring
• documentation
• functional tests
• integration tests
• test automation
• unit tests
• manual tests

WHAT SUCCESS LOOKS LIKE

• Teams rely on you for technical direction and practical problem-solving, and move faster thanks to the foundations, tooling, standards and guidance you help establish.
• The platform becomes more reliable, scalable and easier to operate over time, with fewer production incidents.
• Technical decisions are made with greater clarity, consistency and long-term sustainability.
• Cross-team dependencies are better coordinated, reducing friction and improving delivery.
• Engineers grow technically through your mentorship, feedback and leadership.

JOIN US!

What we offer

• Competitive salary aligned with your experience, expertise, and impact
• A collaborative, inclusive, and fast-paced engineering environment where ideas are welcomed, ownership is encouraged, and continuous learning is valued
• Hybrid work policy
• 4 weeks of Workation (T&C apply)
• Benefits package - 800 PLN net (B2B)/gross (UOP) monthly with access to the cafeteria platform (private medical care, insurances, sports card)
• Training budget
• ICAS's assistance program can provide help and guidance during challenging moments.
• Our office provides complimentary snacks and drinks; on Mondays, we serve complimentary breakfast.
• Team and office social events throughout the year
• Free parking for bicycles and motorcycles
• Free gym in the building
• Equipment: MacBook Pro + smartphone (iPhone 16/17 or Samsung Galaxy S25)

Development opportunities we offer

• conferences abroad
• conferences in Poland
• development budget
• external training
• space for experimenting
• support of IT events
• technical knowledge exchange within the company

Benefits

• sharing the costs of sports activities
• private medical care
• sharing the costs of professional training & courses
• life insurance
• flexible working time
• fruits
• integration events
• corporate gym
• no dress code
• coffee / tea
• drinks
• leisure zone
• employee referral program
• training budget
• free of charge psychological, financial and legal support

LeoVegas Group