Senior Software Engineer (.NET / C#) | Greenfield Systems Rebuild | Remote | £80,000–£100,000
This is a hands-on senior engineering role with real technical authority. You will be the lead engineer and technical decision-maker on a greenfield rebuild of a mission-critical system, working within a small, senior team and reporting directly to the Head of Technology. Once the build is delivered, the role expands into enterprise architecture responsibilities. If you are a strong .NET engineer who has been moving into architecture and wants to own the outcome rather than advise on it, this is worth reading.
THE ROLE
- Lead the technical delivery of a greenfield rebuild of a core business system, covering policy, claims and integration layers.
- Set and enforce technical standards, own code quality, and conduct structured code reviews across the delivery team.
- Work directly with the BA to translate business requirements into sound technical design and produce low-level design documentation.
- Make architecture decisions, present options clearly to non-technical stakeholders, and govern integration standards across the programme.
- Support the Infrastructure and Data Engineers with cross-cutting technical decisions throughout the build.
- Post go-live: take on broader enterprise architecture responsibilities including architecture governance, technology strategy and platform evolution planning.
WHAT WE'RE LOOKING FOR
Must-have
- 5+ years in senior software engineering or technical lead roles, with strong hands-on .NET / C# delivery.
- Demonstrable experience leading architecture decisions on production-grade systems, not just contributing to them.
- REST API design and integration experience at scale, including defining and governing integration standards.
- Microsoft SQL Server: schema design, query optimisation, and working knowledge of Always On configuration.
- Azure infrastructure: practical experience with Azure VM, SQL on Azure and Availability Groups.
- Experience mentoring or managing more junior engineers within a delivery team.
- Comfortable producing and presenting design documentation to both technical and non-technical audiences.
Nice-to-have
- Prior experience in insurance, financial services or another regulated industry.
- Familiarity with claims management systems, policy administration platforms or related workflows.
- Python for automation, tooling or data engineering support.
- Experience stepping into or transitioning from an enterprise architect or solutions architect position.
- Active use of AI coding tools and a willingness to embed them into day-to-day engineering practice.
WHAT'S ON OFFER
- £80,000–£100,000 depending on experience.
- Fully remote role with occasional travel to London when needed.
- 28 days holiday plus bank holidays.
- Private Medical Insurance for you and your family.
- Pension with contributions matched up to 6%.
- Life assurance.
- Direct access to programme leadership, a senior multi-disciplinary team, and a clear path into enterprise architecture post-delivery.
APPLY
If this looks like the right next move, apply now or reach out directly for a conversation before committing to a full application. We are happy to talk through the detail first.