Principal Full Stack JavaScript Engineer

2 weeks ago Be among the first 25 applicants

Type: Full-time, Contract (outside IR35)
Location: UK-based (flexible home, office, or hybrid working)
Office locations: Newcastle and Leeds
Hub locations: Edinburgh, Manchester, London

We’re growing our Engineering team to strengthen our ability to deliver world-class digital products for our clients.

As a Principal Full Stack JavaScript Engineer, you’ll join a small, highly technical group tackling a complex transformation: down a monolithic JavaScript platform into clearer, modern components.

This is an individual contributor role for someone who thrives on problem-solving, can ramp up quickly, and can collaborate confidently with other very strong engineers.

You’ll be hands-on from day one, helping modernise architecture, improve maintainability, and set the foundations for future technology decisions, all while staying pragmatic and delivery-focused.

• Break down an existing monolithic system into well-structured components and services.
• Work closely with senior client engineers, ask the right questions, and influence technical direction through evidence and collaboration.
• Support a move from Vercel-hosted deployment towards a Google Cloud future, improving deployment and operational readiness.
• Contribute to authentication modernisation by integrating an identity platform rather than maintaining bespoke authentication.
• Deliver value quickly by quickly understanding the domain, codebase, and priorities.

We’re an outcome-driven product consultancy where product, design, and research sit side by side. You’ll join a team that values curiosity, collaboration and impact, building products that truly matter.

• Strong full-stack experience, including Node.js and API architecture.
• A pragmatic mindset: you care about quality, but you also deliver outcomes and keep momentum.
• Confident communicator who can hold their own in technical discussions with senior engineers.
• Comfortable working in small, flat teams with little hierarchy and lots of collaboration.

• Experience with Google Cloud (especially identity or auth-related services).
• Experience with Vercel or modern web deployment platforms.
• Interest or experience in open source communities or open source strategy.
• Exposure to geospatial/GIS/mapping products or highly interactive map UIs.

Submit your application below. Please note that we’re unable to offer visa sponsorship for this role.

Seniority level: Not Applicable

Employment type: Contract

Job function: Engineering and Information Technology

Industries: Business Consulting and Services