Who are OnCommerce?
OnCommerce is a global selling platform that powers a growing network of retail channels, including:
OnBuy - The only marketplace in the world to give customers instant Cashback on everything
easyShop - An all-new marketplace created in collaboration with the easy® family of brands
Comet - The iconic UK tech brand making its return later this year OnCommerce is growing fast, launching new brands and scaling to power the future of ecommerce.
Be Part of the Story
OnCommerce is constantly evolving. Everyone here plays a hands-on role in shaping what comes next, building brands that make an impact across global markets. There’s no red tape or rigid corporate structure; just smart people taking ownership and figuring things out as we build something big together. The pace is fast, priorities shift, things aren’t always perfectly set up, and you’ll often need to get stuck in and solve problems. But if you thrive in that kind of environment, you’ll have real influence, real ownership, and the chance to grow with a rapidly scaling business.
The Role
End-to-End Engineering Ownership
Design, build, and maintain full-stack solutions across UI, APIs, and backend systems
Translate product requirements, designs, and wireframes into scalable, production-ready systems
Own features from concept → development → testing → release → monitoring Front-End Excellence
Build responsive, high-performance user interfaces using modern JavaScript frameworks
Translate UI/UX designs into clean, maintainable code
·Optimise applications for speed, scalability, and usability Back-End & Platform Engineering
Design and develop scalable services and APIs
Work across monolith and microservices architecture (Laravel / PHP services)
Maintain and evolve legacy systems while building modern, scalable architecture Quality & Engineering Standards
Own quality to production — testing is embedded, not a phase
Write and maintain automated tests (unit, integration, end-to-end)
Participate in and lead code reviews to ensure high engineering standards
Debug, troubleshoot, and resolve issues across the stack Performance & Scalability
Optimise systems for performance, reliability, and scale
Work with large-scale data systems (MySQL, NoSQL, search platforms)
Identify bottlenecks and proactively improve system efficiency Collaboration & Leadership
Work in cross-functional teams with Product, Design, QA, and other Engineers
Mentor and support less experienced engineers
Communicate technical concepts clearly to non-technical stakeholders Requirements
Essential
Strong full stack engineering experience, owning end-to-end delivery
Proven backend expertise in PHP (Laravel)
Strong JavaScript (ES6+) skills with modern frameworks (React/Vue/Angular)
Experience designing and building RESTful APIs and scalable systems
Experience with MySQL and NoSQL databases (e.g. Couchbase, MongoDB)
Strong understanding of system architecture and microservices
Experience with event-driven systems (e.g. RabbitMQ, Pub/Sub) and cloud environments (GCP)
Familiarity with Docker and CI/CD pipelines
Strong engineering practices: testing, code quality, and production ownership Desirable
Experience in eCommerce or marketplace platforms
Cloud experience (GCP)
Experience with NoSQL (e.g. Couchbase) and Search platforms (e.g. Constructor & Solr)
Experience working in microservices architecture Benefits
This role is UK remote role you must be based in the UK and have full right to work in the UK.
The day rate is £450- £650 per day. DOE Please confirm your outside IR35 day rate upon application. This is a 2.5 month contract until the end of August,
Our Commitment
OnBuy is an equal opportunities employer. We are dedicated to creating a fair and transparent workforce, starting with a recruitment process that does not discriminate on the basis of gender, sexual orientation, marital or civil partnership status, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability, or age.
Just a heads up — we never use WhatsApp or any messaging apps to contact candidates. If someone reaches out this way, it isn’t us and let the recruitment team know.
OnCommerce is a global ecommerce platform that powers a growing network of retail channels and marketplaces. The company operates OnBuy, a marketplace distinguished by offering customers instant cashback on all purchases, as well as easyShop, created in collaboration with the easy® family of brands, and Comet, the iconic UK tech brand making its return. OnCommerce is rapidly scaling and launching new brands to shape the future of ecommerce across global markets. The company operates with a flat structure emphasizing hands-on ownership, fast-paced execution, and collaborative problem-solving among smart teams building impactful brands.
