Lead / Senior Full Stack Software Engineer

Salary: £60,000 - 75,000 per year

Requirements:

We are looking for a Lead/Senior Full Stack Shopify Developer who understands the commercial realities of e-commerce and takes pride in the quality of our engineering.

Strong knowledge of Shopify, including its capabilities, quirks, and how to build custom workarounds when it hits its limits.

5+ years experience in JavaScript.

Strong knowledge of NodeJS and Vanilla JavaScript (ES6+).

Experience with serverless technology and deploying cloud functions.

Experience with AI tools and knowing when and where to use them effectively.

Experience with cloud platforms such as AWS, GCP, or Azure.

Experience working with enterprise CMS platforms such as Drupal or Umbraco.

A solid understanding of User Stories and agile workflows.

Experience with Test Automation, TDD, or BDD.

Responsibilities:

Architect and build solutions that push Shopify to its limits.

Define our technical approach and take ownership of our processes.

Ensure we deliver reliable, scalable, and maintainable systems.

Work within multidisciplinary teams across multiple high-stakes projects.

Lead the technical delivery of projects while keeping a close eye on our strategy.

Design robust technology solutions and maintainable codebases.

Convert complex scope into clear technical briefs and comprehensive project documentation.

Champion new technologies and standards.

Educate yourself and your team on bleeding-edge technology.

Collaborate cross-functionally with project management, design, and data & insight.

Manage team sprint burndowns, communicate budget impacts, and refine project scope with the PMs.

Provide constructive feedback on UI/UX, suggest innovations, and guide designs around Shopifys technical limitations.

Champion user value by defining what data we need to collect, how we collect it, and why it matters.

Define, refine, and communicate our core development processes and best practices across the agency.

Technologies:

AI

AWS

Architect

Azure

Cloud

CMS

Drupal

ES6

GCP

JavaScript

NodeJS

REST

Serverless

Shopify

TDD

Umbraco

UX UI Design

Support

Fullstack

More:

We are Onstate, a specialist Shopify agency based in Leeds with a hybrid approach, and most of our team works in the office two to three days a week with flexibility to work remotely the rest of the time. We take on complex, high-scale Shopify projects, including large product catalogues, custom systems, and highly personalised customer journeys. We deliver work through Discover, Define, Deliver, and Deploy, and we continually refine how we work. We offer a salary of £60,000 to £75,000, cash back medical care, a 5%/3% pension contribution, 25 days holiday plus your birthday off, a Mac or PC based on preference, dedicated time for process development and R&D, company events, on-site parking, and work from home flexibility.

last updated 36 week of 2026

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