Back End Developer

Senior Backend Engineer/Full Stack (Node.js / TypeScript) – Contract

Location: London (Hybrid)

Duration: Initial 6 months (likely to extend)

Day Rate: £650–£800 per day (Inside IR35)

Overview

We’re looking for a Senior Backend Engineer to support the design and delivery of scalable systems, with a strong focus on workflows, event-driven architecture, and API design.

This role will play a key part in shaping system design decisions, balancing trade-offs, and contributing to the evolution of the engineering landscape as the team transitions from JavaScript to TypeScript.

Key Responsibilities

• Design and build scalable backend systems using Node.js
• Develop and optimise workflows across distributed systems
• Work with event-driven architectures and messaging patterns
• Design and integrate robust APIs (REST / event-based)
• Evaluate and communicate system design trade-offs (performance, scalability, maintainability)
• Contribute to architectural decisions and best practices
• Support the transition from JavaScript to TypeScript
• Collaborate closely with cross-functional teams across product and engineering

Skills & Experience

Essential

• Strong experience with Node.js in production environments
• Solid understanding of system design and architecture
• Experience working with workflows and event-driven systems
• Strong API design and integration experience
• Ability to evaluate and communicate technical trade-offs
• Experience working in agile, collaborative environments

Desirable

• Experience with TypeScript (or exposure and willingness to adopt)
• Experience with Next.js
• Familiarity with modern event streaming or messaging systems
• Exposure to AI-assisted development tools, including Claude Code
• Experience working in scaling or transformation environments