Senior Full Stack Developer

We’re looking for a Senior Full Stack Developer to own features end-to-end across our .NET backend and React Native mobile client. You’ll work close to the domain - instalment maths, double-entry ledgers, scheduled money movement, and third-party integrations with banking and identity providers. This is a hands-on senior role with real ownership and influence over architecture.

What you’ll work with

• Backend: .NET 10 / C#, EF Core (SQL Server), a service-oriented solution with clean domain boundaries
• Async & messaging: MassTransit, background workers, durable/idempotent scheduled jobs
• Cloud & platform: Azure, .NET Aspire, containerised services
• Mobile: Expo / React Native (TypeScript)
• Integrations: Open Banking, VRP, BaaS, identity verification, credit decisioning
• Practices: ADR-driven architecture, EF Core migrations, automated testing (MSTest, NSubstitute, FluentAssertions)

What you’ll do

• Design and ship features spanning the C# backend and the React Native app
• Model financial domains carefully - money, fees, timing differences, ledgers - where precision is non-negotiable
• Build resilient, idempotent background processing for payment execution and scheduling
• Integrate with external banking, payments, and identity providers
• Contribute to architectural decisions

• Strong commercial experience with C# / .NET and modern TypeScript
• Solid EF Core / relational database skills (SQL Server ideal)
• Experience building and consuming APIs, and working with asynchronous/message-based systems
• React Native (Expo) experience, or strong React skills and appetite to work across mobile
• A pragmatic, quality-first mindset - you care about correctness, testing, and clear design
• Bonus: FinTech / payments / Open Banking experience, cloud (Azure), event-driven architecture

• £65k-£85k salary depending on experience
• Hybrid working from our Manchester office
• 25 days holiday + bank holidays
• Pension, and the chance to shape a product (and a team) from an early stage
• Meaningful ownership and a direct line to the impact of your work
• Sound like you? Apply with your CV and a short note on something you’ve built that you’re proud of.

Pay: £65,000.00-£85,000.00 per year

Ability to commute/relocate:

• Manchester, Greater Manchester: reliably commute or plan to relocate before starting work (required)

Application question(s):

• Do you now or in the future require sponsorship for a work visa?
• What are your base salary expectations?

We’re a Manchester-based FinTech building a smarter way for tenants to pay rent. Our platform pays landlords the full rent on time and collects smaller instalments from tenants via Open Banking Variable Recurring Payments (VRP). We’re a small, high-trust engineering team solving genuinely hard problems in payments, credit, and financial correctness - where getting the maths and the money movement exactly right matters.