Senior Kotlin Engineer - Backend

Senior Backend Kotlin Developer (AWS)

Salary: Up to £130,000

Location: London (Hybrid – 2 days per week in office)

Experience: 8+ years

The Role

We’re looking for a highly experienced Senior Backend Kotlin Developer to join our growing engineering team. You’ll play a key role in designing, building, and scaling robust backend systems that power mission-critical products, working closely with product, frontend, and DevOps teams.

This is a hands-on senior role with real technical influence, ideal for someone who enjoys solving complex problems and shaping backend architecture in a cloud-native environment.

What You’ll Be Doing

• Designing, developing, and maintaining high-performance backend services using Kotlin
• Building and operating scalable systems on AWS
• Contributing to system architecture and technical decision-making
• Writing clean, maintainable, and well-tested code
• Improving reliability, performance, and security across backend services
• Mentoring junior engineers and promoting best engineering practices
• Collaborating with cross-functional teams to deliver high-quality solutions

What We’re Looking For

• 8+ years of professional backend development experience
• Strong commercial experience with Kotlin (or Java with deep Kotlin exposure)
• Solid experience designing and operating systems on AWS
• Experience with microservices, REST APIs, and event-driven architectures
• Strong understanding of databases (SQL and/or NoSQL)
• Experience with CI/CD pipelines and modern DevOps practices
• Excellent problem-solving and communication skills
• Comfortable working in a hybrid London-based setup (2 days/week)

Nice to Have

• Experience with containers (Docker, Kubernetes)
• Knowledge of infrastructure as code (Terraform, CloudFormation)
• Experience in high-scale or high-availability systems
• Exposure to domain-driven design or distributed systems