Senior UI Engineer; Shopify Web & eCommerce - Front End

Who are IDHL?

At IDHL, we’re more than a digital agency, we’re a strategic partner to ambitious brands, helping them accelerate growth in the digital economy.

Our expertise is delivered through three core divisions:
Performance, Web & eCommerce, and Intelligence – all working closely together to create impact across channels.

We’re also home to Fostr, a Shopify Plus agency for luxury and lifestyle brands, and The MTM Agency, specialists in integrated marketing and audience engagement.

What connects it all is our focus on outcomes, not just outputs. We back each other, take pride in what we do, and make sure the way we work works for everyone.

As a Senior UI Engineer, you’ll operate as a technical leader across multiple projects and teams, shaping frontend architecture, enforcing platform-wide standards, and mentoring developers at all levels. You’ll play a critical role in ensuring code quality, consistency, and performance across the frontend practice, while collaborating with designers, backend developers, and stakeholders to deliver user-focused digital experiences. This is a senior technical role for developers who combine deep expertise with strong communication and leadership skills.

• Build high-quality, scalable Shopify solutions across themes, apps, checkout, and headless builds
• Own features end-to-end — from technical design to delivery and support
• Collaborate closely with designers, PMs, and clients to deliver excellent ecommerce experiences
• Champion clean code, performance, testing, and documentation
• Mentor teammates and contribute to better development standards and tooling

• Strong experience with Shopify (themes, apps, APIs, checkout, Markets, and Graph
  
  QL)
• Advanced JavaScript / Type Script skills and solid OOP fundamentals
• Experience with headless commerce (Hydrogen, Oxygen, or React-based frameworks)
• Performance-focused mindset, including Lighthouse optimisation
  
  Confident Git workflow and experience with CI/CD pipelines

• Experience with Gadget.dev, Shopify POS, or B2B features
• Knowledge of modern build tools (Webpack, Yarn, Gulp, etc.)
• Shopify certifications (or willingness to work toward them)

• Work on varied, high-impact ecommerce projects
• Real ownership, trust, and autonomy
• Strong focus on quality, learning, and career progression

Full Job Spec Available Upon Request