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wearebeyondsports

Freelance Backend Engineer

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Senior Backend Java Engineer (Freelance Contract) – Hungary

Contract Length: 6+ 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 a large-scale cloud migration project, moving critical backend services and infrastructure from AWS to Azure.

This is a hands-on freelance contract opportunity for a senior engineer with deep Java expertise, strong cloud migration experience, and a passion for building scalable, high-performance backend systems. You’ll work closely with cross-functional engineering teams to modernise services, improve architecture, and ensure smooth integration across cloud environments.

Key Responsibilities

  • Design, refactor, and migrate scalable backend systems and REST APIs using Java and Spring Boot

  • Support AWS to Azure migration activities across applications and infrastructure

  • Re-architect and modularise services to improve scalability, maintainability, and performance

  • Implement secure identity, secrets management, and key vault solutions

  • Integrate third-party services including sports data, video, and commentary providers

  • Build and maintain APIs supporting web and mobile applications

  • Deliver infrastructure changes using Infrastructure as Code tools such as Terraform and Bicep

  • Manage deployments and automation through CI/CD pipelines

  • Monitor, troubleshoot, and optimise cloud services and application performance

  • Collaborate in sprint planning, technical discussions, and code reviews

  • Produce clear technical documentation for systems, APIs, and migration processes

Required Skills & Experience

Essential

  • Strong commercial experience with Java and Spring Boot

  • Proven experience delivering AWS → Azure migration projects

  • Strong understanding of cloud security, IAM, secrets management, and key vaults

  • Experience designing and integrating RESTful APIs

  • Docker containerisation experience

  • Kubernetes experience across EKS and/or AKS

  • Strong knowledge of AWS services including S3, DynamoDB, and RDS

  • Experience with Azure services including Cosmos DB, Blob Storage, and Azure Database for MySQL

  • Cloud networking knowledge including VPCs, VNets, API Gateway, and API Management

  • Infrastructure as Code experience with Terraform

  • CI/CD pipeline automation using tools such as GitLab, Bitbucket Pipelines, or ArgoCD

Desirable

  • Cloud cost optimisation and performance tuning experience

  • Strong testing and QA practices including automation and regression testing

  • Kafka or other event-driven architecture experience

  • SQL database experience including PostgreSQL, MySQL, or Azure SQL

If you're an experienced backend engineer looking for your next freelance contract within a modern sports technology environment, we’d love to hear from you.