Lead Full Stack Engineer

We're working with a premium digital agency that specialises in the projects most agencies wouldn't.

They're looking for a Lead / Senior Full Stack Software Engineer who enjoys solving genuinely complex engineering problems, taking ownership of technical solutions and helping shape how a team builds and delivers.

This isn't a role centred around building Shopify stores. Shopify is part of the environment, but the real focus is full-stack engineering, architecture, infrastructure and technical leadership.

You'll work on projects involving complex integrations, custom systems, data, APIs and highly personalised customer journeys, helping architect solutions that go well beyond what an off-the-shelf platform can offer.

You'll be involved in:

• Taking technical ownership of projects from initial requirements through to delivery
• Architecting and building scalable, maintainable full-stack solutions
• Making key technical and architectural decisions
• Working across application, backend and infrastructure layers
• Turning complex requirements into clear technical approaches
• Helping shape engineering standards, processes and best practices
• Working closely with PM, Design and Data teams
• Speaking directly with clients, understanding their challenges and explaining technical solutions clearly
• Using AI effectively within your development workflow and helping identify where emerging technologies can improve how the team builds and delivers
• Supporting and mentoring other engineers, helping raise the technical capability of the wider team

What we're looking for;

We're looking for someone with a strong engineering background who has moved beyond simply delivering tickets and is comfortable taking ownership of how things are built.

You'll ideally have:

• Strong commercial experience across full-stack software engineering
• 5+ years' experience with JavaScript
• Strong Node.js and Vanilla JavaScript (ES6+)
• Good understanding of modern frontend and backend development
• Experience with cloud infrastructure, serverless architecture and cloud functions
• A strong understanding of APIs, integrations and distributed systems
• Experience making architectural and technical decisions on complex projects
• Good working knowledge of AI tools and how to use them effectively within software engineering
• Experience working in an agency, consultancy or other client-facing environment
• The confidence to speak with clients and translate technical concepts into clear, understandable language
• Strong communication skills and a genuine interest in helping other engineers develop

Shopify experience would be useful, but it isn't the defining part of the role. Experience with AWS, GCP, Azure or enterprise CMS platforms would also be valuable.

The team is based in Leeds and works flexibly. There is an expectation that you'll spend around one day a week in the Leeds office, with the rest of the role worked flexibly.

If you're a senior engineer who enjoys solving difficult problems, getting involved in architecture and infrastructure, working directly with clients and having a genuine influence on how a team builds software, this could be an interesting one.