Full Stack .Net Developer (Modernisation & Greenfield)
Milton Keynes, 2 days per week in office.
£45000 - £58000 + Package.
Your new company
This is a rare opportunity to join a well-established, highly profitable UK business at a genuine inflection point in its technology journey. Backed by a newly appointed CTO and a clear investment strategy, the organisation is accelerating its shift towards a modern, product-led engineering culture.
Historically rooted in large-scale, mission-critical systems, the business is now transforming how it builds and delivers software, moving away from legacy desktop applications towards scalable, cloud-oriented, API-first platforms. What sets this role apart is the balance of stability and ambition. You are not joining a startup, but you will get to work on a transformation programme that has real momentum, strong leadership backing, and visible business impact.
The role is 2 days per week in their new Head Office in Milton Keynes, easily accessible by car or train.
Your new role
You will join a high-performing development team of around 6 to 10 engineers, playing a key role in one of the organisation's most important technology programmes. The immediate focus will be evolving core systems, moving from legacy WinForms and desktop-based architecture into modern, web-based internal platforms built on APIs and cloud-first principles.
This is not a simple migration. It is a genuine re-engineering effort where you will influence design decisions, shape architecture, and help define how future systems are built. You will work across the full stack, delivering robust backend services alongside modern front-end applications, all within a structured but progressive Agile environment.
What makes this role stand out is the roadmap beyond the transformation. Once the modernisation programme is complete, there is a strong pipeline of greenfield work including new digital platforms, chatbot technology and AI-driven solutions. It is an opportunity to stay close to innovation, rather than being confined to legacy support.
Ultimately, this role suits someone who wants to do more than just deliver tickets. You will be someone who enjoys improving systems, influencing direction and contributing to a team that is actively evolving how it builds software.
What you'll need to succeed
These are mid-level or low-senior hires. We need minimum 2+ years commercial programming experience working as a Full Stack C# .Net Developer.
Strong Back End .Net Core / SQL Server and React/TypeScript (or Blazor) but new Front End development will be done in React.
You will bring solid expertise in cloud environments, particularly Azure. A grounding in engineering best practices is key, including object-oriented design, clean code principles and a structured approach to testing such as TDD, as well as experience working in Agile environments.
Beyond the core skillset, what will really set you apart is your ability to operate in more complex, scalable environments. Experience with microservices or distributed systems, an understanding of concurrency, parallelism or multi-threading, and exposure to high-scale cloud-based architectures will all add significant value. Any experience with AI tooling in a development environment, or relevant certifications within the Microsoft ecosystem, will further strengthen your profile.
What you'll get in return
You'll benefit from a competitive package including strong pension and life assurance, generous holiday allowance, a wide range of retail and lifestyle discounts, and access to comprehensive wellbeing support. The business also invests heavily in training and internal progression, alongside a flexible hybrid working model.
Alongside this, you will benefit from a flexible hybrid model with two days per week in a Milton Keynes office, a collaborative team environment where your voice is heard, and clear progression opportunities as the technology function continues to grow.
What you need to do now
To find out more and to be considered for this position please apply directly, or contact Max Wilcock, Business Director on .
At Hays Technology, we are shaping the future of recruitment. The rapid adoption of cloud, which is making customer interfaces more engaging and creating a seamless engagement with businesses, means that from the foundation of your organisation up, software developers are critical to success. As the competition for talent grows, we're ready and waiting to help developers really make an impact on organisations, so talk to us today. We are Hays Technology.
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