Immersum
Senior Software Engineer
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Senior Software Engineer (.NET)
Hybrid – London | 2–3 days per week in office
£85,000 – £90,000
Tech stack:.NET 10, C#, Azure, SQL Server, EF Core, Azure DevOps, Grafana, Application Insights
Immersum is partnering with a global payments business looking for a Senior Software Engineer to join their Banking & FX team, working on the systems responsible for moving client money across payments, FX, reconciliation and banking integrations.
This is a hands-on role for a strong.NET engineer who enjoys working on complex, high-reliability systems where getting it right really matters.
The Role
- Build and own production services using.NET 10 and Azure
- Develop asynchronous, event-driven systems that handle failures, retries, timeouts, and duplicate messages
- Work across payments, FX, ledgers, reconciliation, and banking integrations
- Integrate with banks and payment schemes
- Make architectural decisions and own your services from development through to production
- Build security, reliability, and observability into systems from the start
- Use Grafana, Application Insights, and Claude Code as part of the engineering workflow
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What We’re Looking For
- Strong commercial experience with.NET / C#
- Experience building and running production services in the cloud
- Strong understanding of asynchronous and event-driven systems
- Experience with Azure, or AWS/GCP
- Strong SQL Server experience and familiarity with EF Core
- Good testing and software engineering fundamentals
- Experience working with security, reliability, and observability
- Comfortable working in a regulated environment
- Strong communication skills and the confidence to challenge technical decisions
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Why Join
- Work on critical systems responsible for moving client money
- Genuine ownership over the services you build
- Modern.NET 10, Azure, and AI tooling environment
- Autonomous engineering team with real influence over technical decisions
- Competitive benefits including 25 days' holiday + bank holidays, bonus, pension, healthcare, and enhanced parental leave.
Please note this role requires full right to work in the UK.
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