Senior Backend Engineer | .NET / C#, SQL Server, Azure | Founder-Built B2B SaaS Platform Ready to Scale
* Salary: £80,000 - £100,000 (dependent on experience and on-site attendance)
* Location: North London - hybrid, (3-4 days onsite)
A bootstrapped, profitable SaaS platform serving B2B operators across manufacturing, distribution, and wholesale - built lean, grown on reputation alone, and now at the point where the engineering team needs to grow. The product sits at the operational core of its customers businesses. When it goes down, they stop. It rarely does.
The founder is the sole developer, and you would be the second. Working directly alongside the person who built and knows the system end to end, on a product that competes with the likes of NetSuite and SAP at a fraction of the cost and without the third-party consultant overhead those platforms require.
The stack is .NET Core on the backend, SQL Server and PostgreSQL, React on the frontend, everything running on Kubernetes (AKS) in Azure across EU and US regions. A legacy MVC layer is being migrated out - comfort reading Razor is useful, but new work is all Core and API. CI/CD is in place and releases move fast.
Roughly 90% of the role is development. The remaining 10% is DevOps awareness - understanding what is happening in Kubernetes, handling the occasional VM incident, not being thrown by a kubectl query. The infrastructure is stable and largely self-managing.
Non-Negotiables
* .NET / C# - strong, production-level experience
* SQL Server - solid working knowledge (DBA level not required)
* Virtual machines - comfortable with VM environments
* Able to read and navigate legacy .NET MVC / Razor code
* Commercial software product development
What Youll Work With
* Azure (AKS) - Kubernetes clusters running EU and US workloads
* PostgreSQL (alongside SQL Server)
* React (frontend, primarily maintained by a separate engineer)
* HAProxy - VM monitoring and failover
* CI/CD pipeline - fast release cadence, multiple deploys daily
* Keycloak - authentication layer
* Marketplace and courier integrations (eBay, Amazon, Royal Mail, others)
Nice to Haves
* DevOps background or exposure to IaC
* Experience with multi-region deployments and failover architecture
* Leadership experience or appetite - there will be juniors to bring in as the team grows
* Familiarity with AI tooling) - the team is building with it
Why Join / Projects
The codebase was built by one person and the near-term work is making it team-ready - organising it, adding features, laying the foundations for a growing team. The business ships fast and there is a full product roadmap to get through.
It is bootstrapped and profitable, the founder is open to good ideas, and whoever joins now will have real influence on how the engineering function takes shape, as well as have the opportunity to eventually grow their own team. The product is also more modern than the legacy layer suggests - an MCP integration is already live and the team builds with AI tooling.
Employee Benefits
* Share options - intended for the right person as the business formalises the scheme
* Thursday team lunches
* Parking on site
* Flexible, grown-up environment - small team, a lot of give
Senior Backend Engineer | .NET / C#, SQL Server, Azure | Founder-Built B2B SaaS Platform Ready to Scale