- Employment
- Temporary
About the role
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.
747,000+ hidden jobs like this
Beyond Sports and thousands of companies post here first — often days before LinkedIn or Indeed. Your first 5 applications are free; go Pro to apply without limits.
Everything Pro unlocks:
- Unlimited applications — free stops at 5
- Track every application in one place
- Apply straight to the source, one click
- Save & organize roles you love
- Roles pulled from company boards before the big sites
