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Freelance Backend Software Engineer

Beyond Sports · Hungary, Budapest

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Senior Backend Java Engineer (Freelance Contract) – Hungary Contract Length: 3+ Months Start Date: ASAP Day Rate: 120,000 HUF – 180,000 HUF per day Location: Hungary About the Role Beyond Sports is looking for an experienced Senior Backend Java Engineer to support the development, scaling, and modernisation of our high-performance backend systems and cloud infrastructure. This is a hands-on freelance contract opportunity for a senior engineer with deep Java expertise, strong cloud experience, and a passion for building resilient, scalable systems. You’ll work closely with cross-functional engineering teams to refactor core microservices, improve system architecture, and ensure low-latency integrations across our web and mobile platforms. Key Responsibilities

  • Design, refactor, and maintain scalable backend microservices and REST APIs using Java and Spring Boot
  • Re-architect existing backend systems to optimize for maintainability, reliability, and throughput
  • Implement secure identity, secrets management, and authentication standards across cloud environments
  • Integrate third-party systems, including real-time sports data feeds, video streams, and commentary providers
  • Deploy and manage containerised services using Docker and Kubernetes
  • Provision and maintain cloud infrastructure using Infrastructure as Code (IaC) tools like Terraform
  • Build, automate, and manage deployment workflows using modern CI/CD pipelines
  • Monitor, troubleshoot, and optimize application and database performance
  • Participate in technical planning, architectural discussions, and peer code reviews
  • Produce clear, maintainable technical documentation for APIs and core backend systems Required Skills & Experience Essential
  • Strong commercial contracting experience with Java and Spring Boot
  • Proven background building, deploying, and maintaining applications in production cloud environments ( AWS or Azure )
  • Hands-on experience with containerisation and orchestration using Docker and Kubernetes
  • Expertise in designing and building secure, high-traffic RESTful APIs
  • Practical experience writing Infrastructure as Code using Terraform
  • Solid working knowledge of relational and NoSQL databases (e.g., PostgreSQL , MySQL , DynamoDB , Cosmos DB )
  • Deep understanding of cloud security fundamentals (IAM, secrets management, key vaults)
  • Experience setting up and maintaining CI/CD pipelines (e.g., GitLab CI , Bitbucket Pipelines , or ArgoCD ) Desirable
  • Experience with event-driven architectures using Apache Kafka or similar messaging systems
  • Prior exposure to performance tuning and cloud cost-optimisation strategies
  • Strong automated testing practices (unit, integration, and regression testing)
  • Understanding of cloud networking components (VPCs/VNets, API Gateways)