Lead Fullstack Engineer

We are looking for a Staff Full-Stack Engineer to take technical ownership across backend and frontend development, shaping high-quality, scalable solutions and setting engineering standards for the team. This role combines hands-on delivery with technical leadership, mentoring, and close collaboration with product and platform teams.

You will work across modern backend services built in Kotlin, rich frontend applications using React and Next.js with TypeScript, and cloud-native infrastructure on Azure or AWS.

This is an initial six month contract that sits outside IR35. Please note, you'll be required to work onsite in Paddington, London, for 3 days a week.

Key Responsibilities

• Lead the design and development of full-stack solutions, balancing backend robustness with high-quality user experiences
• Build and maintain backend services using Kotlin, following clean architecture and best practices
• Develop modern, performant frontends using React, Next.js, and TypeScript
• Take ownership of API design, integration, and lifecycle management using Apigee
• Design and operate cloud-native solutions using Azure or AWS, including containerised workloads
• Champion strong observability practices, ensuring systems are reliable, measurable, and easy to troubleshoot
• Set technical direction, standards, and best practices across the team
• Mentor and support other engineers through code reviews, pairing, and technical guidance
• Collaborate closely with Product, DevOps, and Architecture to deliver scalable, secure solutions