Senior Full Stack Engineer, Contractor

🕒 July 6

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OnBuy

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2016

🏪 Marketplace

🛍️ eCommerce

🛒 Retail

💰 Debt Financing on 2021-07

Marketplace • eCommerce • Retail

OnBuy is a UK-based online marketplace that offers a wide variety of products ranging from home and garden essentials, health and beauty products, electronics, and more. Unique in its approach, OnBuy does not sell its own products but provides a platform for small businesses and trusted brands to reach a broad audience. It is known for offering cashback on all purchases, enhancing customer savings with every transaction. With over 35 million products across diverse categories, OnBuy positions itself as a trusted and fair platform for both buyers and sellers, ensuring transparency and protection for each transaction.

📋 Description

• 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 • 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 • 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 • 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 • Optimise systems for performance, reliability, and scale • Work with large-scale data systems (MySQL, NoSQL, search platforms) • Identify bottlenecks and proactively improve system efficiency • 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

• 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. • Please confirm your outside IR35 day rate upon application. • 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.