Senior .NET Engineer – AWS, Kafka, AI-Driven SaaS (Hybrid)

Oliver Bernard; Greater London; Hybrid; GBP 110,000 - 120,000; Full time

Benefits offered by this job

Hybrid working

Career progression

Job summary

Oliver Bernard partners with a high-growth SaaS business in London seeking a Senior Software Engineer to help re-platform core products using .NET, AWS and Kafka in a hybrid setup. You will own delivery, build scalable backend services, participate in code reviews, and collaborate with product, DevOps and data teams to ship reliable, observable cloud-native software for global financial institutions.

You'll leverage modern architectures and AI-assisted tooling to improve speed and quality while

Qualifications

• 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.

Responsibilities

• 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

Skills

C# and .NET

Event-driven architecture

DDD & modern architecture

Testing, CI/CD & observability

AI development tools (Copilot/ Claude/

Tools

AWS

Kafka

Copilot

Claude Code

Codex

Job description

Oliver Bernard partners with a high-growth SaaS business in London seeking a Senior Software Engineer to help re-platform core products using .NET, AWS and Kafka in a hybrid setup. You will own delivery, build scalable backend services, participate in code reviews, and collaborate with product, DevOps and data teams to ship reliable, observable cloud-native software for global financial institutions.

You'll leverage modern architectures and AI-assisted tooling to improve speed and quality while