Senior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven
—
Senior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven We have a unique opportunity for a Senior .NET / Full Stack Developer to join a payments company. As a Senior .NET / Full Stack Developer, you’ll play a key role in building and scaling a high-throughput payments platform as the business enters its next phase of growth. This includes launching new products, enabling new partner integrations, and expanding a platform that already powers multiple live financial services products used globally. You’ll be building on top of 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 senior engineering role where you’ll contribute to architectural discussions, drive engineering best practices, and collaborate closely with other experienced engineers to deliver high-quality systems. Working closely with Product, Data, Risk, and Platform teams, you’ll help evolve the platform architecture and deliver secure, scalable, and resilient distributed systems within a regulated fintech environment. 📍 2–3 days per week in the office – City of London 💰 Up to £600/day Outside IR35 🗓️ Initial 6-month contract Responsibilities • Design and develop high-performance .NET services powering a global payments platform • Build and scale event-driven microservices running in Azure • Contribute to engineering best practices across architecture, coding standards, observability, and reliability • Work closely with product teams to design API-driven payment and partner integrations • Collaborate with other engineers to deliver high-quality, maintainable systems • Help evolve a scalable distributed architecture capable of handling high transaction volumes • Contribute to improving engineering velocity, delivery quality, and platform resilience What we’re looking for • Strong experience building production systems with .NET / C# • Experience building cloud-native systems in Azure • Experience with event-driven architectures (e.g., Kafka, Service Bus, Event Grid, messaging systems) • Proven experience building distributed systems and scalable APIs • Experience working on payments platforms, fintech systems, or high-throughput transactional platforms • Strong understanding of system design, reliability, and performance at scale Senior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven
| Skill | Source | Confidence |
|---|---|---|
| API Integration | llm_hard |
100%
|
| Azure (Microsoft) | llm_hard |
100%
|
| Microservices | llm_hard |
100%
|
| Event-Driven Architecture | llm_hard |
100%
|
| REST API | llm_hard |
80%
|
No soft skills extracted
| Query | Country | Status | Response ms | Created |
|---|---|---|---|---|
| Senior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven | extracted | 3650 | 2026-03-21 22:54 | |
| Senior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven | classified | 519 | 2026-03-21 18:55 | |
| graduate web developer in United Kingdom | gb | duplicate | 20448 | 2026-03-21 16:02 |
| junior full stack developer in United Kingdom | gb | duplicate | 29053 | 2026-03-21 15:40 |
| junior web developer in United Kingdom | gb | processed | 13421 | 2026-03-21 15:18 |
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"job_description": "Senior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven\n\nWe have a unique opportunity for a Senior .NET / Full Stack Developer to join a payments company.\n\nAs a Senior .NET / Full Stack Developer, you’ll play a key role in building and scaling a high-throughput payments platform as the business enters its next phase of growth. This includes launching new products, enabling new partner integrations, and expanding a platform that already powers multiple live financial services products used globally.\n\nYou’ll be building on top of 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.\n\nThis is a hands-on senior engineering role where you’ll contribute to architectural discussions, drive engineering best practices, and collaborate closely with other experienced engineers to deliver high-quality systems.\n\nWorking closely with Product, Data, Risk, and Platform teams, you’ll help evolve the platform architecture and deliver secure, scalable, and resilient distributed systems within a regulated fintech environment.\n\n📍 2–3 days per week in the office – City of London\n\n💰 Up to £600/day Outside IR35\n\n🗓️ Initial 6-month contract\n\nResponsibilities\n• Design and develop high-performance .NET services powering a global payments platform\n• Build and scale event-driven microservices running in Azure\n• Contribute to engineering best practices across architecture, coding standards, observability, and reliability\n• Work closely with product teams to design API-driven payment and partner integrations\n• Collaborate with other engineers to deliver high-quality, maintainable systems\n• Help evolve a scalable distributed architecture capable of handling high transaction volumes\n• Contribute to improving engineering velocity, delivery quality, and platform resilience\n\nWhat we’re looking for\n• Strong experience building production systems with .NET / C#\n• Experience building cloud-native systems in Azure\n• Experience with event-driven architectures (e.g., Kafka, Service Bus, Event Grid, messaging systems)\n• Proven experience building distributed systems and scalable APIs\n• Experience working on payments platforms, fintech systems, or high-throughput transactional platforms\n• Strong understanding of system design, reliability, and performance at scale\n\nSenior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven",
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