Full Stack .NET Developer Mid to Senior

Full Stack .NET Developer Mid to Senior Overview

This is a hands-on full stack development opportunity within a company that creates enterprise software for demanding, highly controlled environments such as defence and aerospace. The product is a training and resource management platform that supports complex operational lifecycles, so the work is focused on core business functionality rather than surface-level web content. Reliability, compliance, auditability, and traceability are central to the role.

The business has recently secured several new contracts and is now moving through a period of strong growth. Because of that expansion, they are looking for developers who can make an immediate contribution and help deliver robust, high-quality software at pace.

What you will do

• Build new product features and improve existing functionality in an enterprise application used in regulated, high-stakes settings.
• Work on software where quality, traceability, and dependable behaviour are essential.
• Contribute as a practical, delivery-focused engineer in a remote-first team.
• If you are hired at mid-level, your main focus will be feature development and enhancement work.
• If you are hired at senior level, you will take ownership of important areas of the product and drive work from early design through to release.
• Develop within a complex application environment, including systems that are commonly deployed in private cloud infrastructure.
• Write code that follows structured, maintainable design approaches.
• Take part in pull request-based code reviews.
• Use unit testing as part of everyday development, with test-driven development preferred where it makes sense pragmatically.
• Work independently while still collaborating effectively with the wider engineering team.
• For senior-level work, get up to speed quickly in an established codebase and operate with a high degree of autonomy.

Technology and engineering approach

• Backend development is based on .NET and C#.
• The frontend uses Vue.js, although experience with React is considered transferable.
• JavaScript is part of the frontend stack.
• Unit testing is expected.
• Test-driven development is preferred, but the team takes a pragmatic approach rather than insisting on dogma.
• Code quality is supported through pull request reviews.
• The team values structured, maintainable design patterns and clean application architecture.

What they are looking for

• Experience building application-level software, not just websites, CMS platforms, or marketing pages.
• A solid grasp of business logic and how to design software in a structured way.
• Comfort with unit testing and attention to test coverage.
• Knowledge of design patterns and clean architecture principles.
• A pragmatic mindset with a strong focus on delivery.
• Confidence working independently in a remote-first environment.
• For senior applicants, the ability to own features or modules end to end.
• For senior applicants, the ability to become productive quickly inside an existing codebase.
• For senior applicants, strong autonomy; this is not a formal leadership role, although progression is possible.

Helpful background

• Experience in regulated industries such as defence, aerospace, healthcare, or fintech would be advantageous.
• Experience with secure environments or private cloud deployments would be useful.
• Exposure to AI tools in development workflows would be a bonus.

Working arrangement

• The role is remote-first.
• There is an initial onboarding period on site in Oxfordshire.
• The team meets in person quarterly.
• Office access is available if needed, but it is optional.

Package and progression

• The salary range is £40,000 to £65,000.
• Exceptional candidates may be considered above that range.
• The company is scaling after recent contract wins, so there is strong growth momentum.
• Although immediate leadership duties are not part of the role, there is a clear path for progression over the next 6 to 12 months as the team grows.

Applications are being handled by Avanti Recruitment, and candidates can apply through the job listing.

Degree Requirement: Not Specified

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