Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS, SQL, Distributed Systems | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract at Owen Thomas | B Corp™, United Kingdom, £400-£450 per day

Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS, SQL, Distributed Systems | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract

We’re hiring multiple Senior Go Backend Engineers (contractors) to join a large-scale public sector transformation programme delivered by a highly regarded product consultancy.

This work is focused on moving critical systems away from a legacy C# ecosystem into a modern, scalable, cloud-native architecture.

You’ll be joining cross-functional teams responsible for building resilient backend services that support high-impact, user-facing products used at national scale.

This is a 6-month initial contract, ideal for engineers who enjoy working on meaningful systems, solving complex migration challenges, and delivering production-grade backend services, fast.

The Role | Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS, SQL, Distributed Systems | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract

This is a hands-on backend engineering role with a strong focus on system design, scalability, and delivery.

You’ll be expected to:

• Build and scale backend services using Go within a cloud-native AWS environment
• Contribute to the migration of legacy C# systems into modern distributed architectures
• Design and develop APIs and event-driven systems
• Work closely with product, design, and other engineers in cross-functional teams
• Apply modern engineering practices including TDD, CI/CD, and Infrastructure as Code
• Write clean, maintainable, and well-tested production code
• Contribute to architectural decisions balancing performance, scalability, and delivery timelines
• Support continuous improvement through code reviews, pairing, and knowledge sharing

This role suits engineers who enjoy working on real-world systems at scale and are comfortable navigating complexity in modernisation programmes.

Technical Requirements | Senior Backend Engineer, Go (Contract) | C# to Go Large-Scale Migration, AWS, SQL, Distributed Systems | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract

Strong, recent experience with:

• Backend development using Go (Golang) in production environments
• Designing and building scalable APIs and distributed systems
• AWS cloud services (e.g. Lambda, ECS/EKS, S3, RDS)
• SQL and data modelling (relational databases)
• Working within microservices or event-driven architectures
• CI/CD pipelines and modern delivery practices
• Infrastructure as Code (e.g. Terraform or similar)
• Test-driven development and automated testing strategies
• Observability, performance tuning, and system reliability

Nice to Have

• Experience migrating legacy systems (e.g. C#/.NET to Go)
• Exposure to containerisation (Docker, Kubernetes)
• Experience in public sector or highly regulated environments
• Familiarity with event streaming (Kafka, SNS/SQS, etc.)

Why This Contract Stands Out | Senior Go Backend Engineer (B2B, Contract) | Golang, AWS, SQL, Distributed Systems | Large-Scale Migration Programme | £400–450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract

• £400-450 per day
• Outside IR35
• Fully remote within the UK
• Long-term programme with strong likelihood of extension
• Opportunity to work on systems with real national impact
• Modern tech environment with strong engineering practices
• Product-led teams with a pragmatic delivery culture

This isn’t a greenfield fantasy, it’s a high-impact backend role focused on modernising critical systems and delivering software that genuinely matters at scale.

If interested, in the Senior Go Backend Engineer (B2B, Contract) | Golang, AWS, SQL, Distributed Systems | Large-Scale Migration Programme | £400–450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract please apply here and WE will back get to you if it's a good fit for the client. :)