Senior Software Engineer | .NET | AWS | Kafka | London | Hybrid | £110-£120k
We're partnering with a high-growth Series B SaaS business that's transforming regulatory technology through a modern, cloud-native platform.
As part of a major re-platforming initiative, they're looking for a Senior Software Engineer to help build the next generation of their core products using .NET, AWS, Kafka, and modern software architecture.
This is an opportunity to join a collaborative engineering team where you'll have real ownership, work with the latest technologies, and help shape the future of a rapidly scaling platform. Working alongside Product, DevOps, Data Engineering, QA, and Regulatory teams, you'll deliver high-quality software that powers mission-critical services for global financial institutions.
What You'll Be Doing
- Building scalable backend services using C# and .NET
- Developing within an event-driven architecture using Kafka
- Writing clean, maintainable, well-tested code
- Participating in code reviews and driving engineering best practices
- Building resilient, observable, cloud-native services on AWS
- Using AI-assisted development tools to improve delivery and code quality
- Collaborating across engineering and product teams to solve complex technical challenges
What We're Looking For
- Strong commercial experience with C# and .NET
- Experience building event-driven, service-based applications
- Knowledge of DDD and modern software architecture
- Strong engineering fundamentals including testing, CI/CD and observability
- Hands-on experience with AWS
- Experience using AI development tools such as Copilot, Claude Code or Codex
- A proactive mindset with ownership of delivery and software quality
Nice to Have
- Experience modernising legacy platforms
- FinTech, RegTech or other regulated industry experience
- Experience with large-scale SaaS platforms
Why Apply?
- Join a fast-growing, private equity-backed SaaS business
- Play a key role in a major platform transformation
- Work in an engineering team actively embracing AI-assisted development
- Excellent opportunities for progression in a collaborative, high-performing environment
- Flexible hybrid working, strong benefits, and a culture focused on ownership, innovation and continuous improvement
Senior Software Engineer | .NET | AWS | Kafka | London | Hybrid | £110-£120k