Senior Software Engineer (.NET / C#) Greenfield Systems Rebuild Remote (UK) 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.
You will be
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.
Application
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.