Senior Full Stack Developer

Spliit; Manchester; Hybrid; GBP 65,000 - 85,000; Full time

Benefits offered by this job

25 days holiday + bank holidays

Pension

Ownership and impact

Hybrid work in Manchester

Job summary

Spliit, a Manchester-based FinTech, is seeking a Senior Full Stack Developer to own features across the .NET backend and React Native mobile client. You’ll work near the payment domain, including instalment maths, ledgers, and third-party bank/identity integrations.

This hands-on senior role offers genuine ownership and influence over architecture, with a hybrid pattern (2–3 days/week in the office) and a culture of precision, testing, and reliable money movement.

Qualifications

• Strong commercial experience with C# / .NET.
• Experience with TypeScript and modern web/mobile stacks.
• Experience building and consuming APIs and asynchronous systems.
• React Native (Expo) experience or strong React skills.

Responsibilities

• Design and ship features spanning the C# backend and the React Native app.
• Model financial domains with precision (money, fees, timing differences, ledgers).
• Build idempotent background processing for payments and scheduling.
• Integrate with external banking, payments, and identity providers.
• Contribute to architectural decisions.

Skills

C# / .NET

TypeScript

React Native

APIs & async systems

Testing frameworks

Tools

MassTransit

Azure

EF Core

Open Banking integrations

React Native (Expo)

Job description

Location:Manchester (Hybrid — typically 2–3 days/week in-office)

Type:Permanent,full-time

About us

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 VariableRecurring 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 exactlyrightmatters.

The role

We're looking for aSenior Full Stack Developerto 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 bankingand identity providers. This is a hands-on senior role with real ownership and influenceoverarchitecture.

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
• 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

What we are looking for

• Strong commercial experience withC# / .NETand modernTypeScript
• 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