Avanti is working with an established software business that is investing heavily in the modernisation of one of it's core platforms and is looking for a Senior Fullstack .NET Developer with strong experience in React.
This is a hands on engineering role where you'll help evolve an established business-critical application into a more modern, scalable architecture.
The focus will be on improving the underlying platform, building modern services and APIs, increasing automated test coverage and gradually moving functionality towards a modern web-based frontend.
You'll remain very hands on with C#/.NET development while also contributing to software design, architecture and technical decisions across the wider engineering team.
The business places a strong emphasis on the engineering quality, automated testing and test-first development, so strong TDD experience is essential.
What you'll be doing
- Building and maintaining applications and services using C# and modern .NET
- Designing and developing REST APIs
- Developing frontend functionality using React
- Helping modernise an established application architecture
- Improving automated test coverage and overall code quality
- Working in a test-first development environment
- Contributing to software design and architecture decisions
- Improving platform maintainability, scalability and long-term technical direction
- Supporting existing systems while helping build their future replacement
Technology Environment
- C# / .NET 8
- REST APIs
- React
- SQL Server
- Automated testing
- TDD
- CI/CD
- Cloud technologies
Essential Skills
- Strong C#/.NET
- React
- TDD
- REST APIs
- CI/CD knowledge
- Experience contributing to architecture / design and technical decisions
- Ability to work independently and take ownership of technical problems
Experience with cloud platforms, legacy application modernisation or AI-assisted development would be useful.
Working arrangement
The role is remote first, with some initial time spent with the team during onboarding, and occasional in person collaboration thereafter (West London / M4 corridor) – costs covered.
Interview process
The process will involve an initial video call which will be a technical discussion, followed by a final-stage video interview including a practical coding element following TDD.
Package
Salary up to £70,000, plus pension, holiday allowance and additional employee benefits.
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Senior .NET Engineer in London employer: Avanti Recruitment
Join a forward-thinking technology company that values innovation and collaboration, offering a dynamic work environment for aspiring engineers. With a strong focus on employee development, you will have access to hands-on training and mentorship from experienced professionals in the field, ensuring your growth in ASIC testing and characterisation. Located in the UK, this role provides a unique opportunity to contribute to cutting-edge projects while enjoying a supportive and inclusive workplace culture.
