Mid-Level .NET / Full Stack Developer – Hybrid – £450/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven

Job description

Mid-Level .NET / Full Stack Developer – Hybrid – £450/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven

We have a great opportunity for a Mid-Level .NET / Full Stack Developer to join a growing payments company.

As a .NET Developer, you’ll be working as part of an experienced engineering team building and scaling a high-throughput payments platform. The business is entering its next phase of growth, launching new products, enabling new partner integrations, and expanding a platform that already powers multiple live financial services products used globally.

You’ll be contributing to a modern, cloud-native platform built with .NET and Azure, designed around API-first architecture and event-driven microservices. The platform supports complex payment flows, partner integrations, and high-volume transaction processing.

This is a hands-on development role where you’ll work closely with senior engineers to deliver reliable, scalable systems while continuing to develop your technical expertise within a modern fintech environment.

Working closely with Product, Data, Risk, and Platform teams, you’ll help build secure, scalable services that power real-time financial transactions.

2–3 days per week in the office – City of London

Up to £450/day Outside IR35

Initial 6-month contract

Responsibilities

• Build and maintain .NET services powering a global payments platform
• Contribute to event-driven microservices running in Azure
• Develop and maintain RESTful APIs used by internal systems and external partners
• Collaborate with senior engineers on system design and implementation
• Write clean, maintainable, and well-tested code
• Participate in code reviews and engineering best practices
• Support the team in delivering scalable and reliable distributed systems

What we’re looking for

• Experience developing applications with .NET / C#
• Exposure to cloud platforms such as Azure
• Experience building or consuming REST APIs
• Understanding of microservices or event-driven architectures
• Experience working in agile engineering teams
• Interest in building high-scale transactional systems

Mid-Level .NET / Full Stack Developer – Hybrid – £450/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full Time Jobs

Published at

16-03-2026

Profession type

Accountancy

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English