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
Posted Today by Owen Thomas | B Corp™
£450 Per day
Outside
fully remote
United Kingdom
Summary: The role of Senior Backend Engineer focuses on migrating critical systems from a legacy C# environment to a modern Go-based architecture within a public sector transformation program. The position requires hands-on backend engineering skills, particularly in building scalable services in a cloud-native AWS environment. Candidates will work in cross-functional teams to design and develop APIs and event-driven systems while applying modern engineering practices. This is a fully remote, 6-month contract role offering a competitive daily rate.
Key Responsibilities:
- 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
Key Skills:
- 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
Salary (Rate): £450/day
City: undetermined
Country: United Kingdom
Working Arrangements: fully remote
IR35 Status: outside IR35
Seniority Level: Senior
Industry: IT
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. :)