Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK 's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don 't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. Working at OnBuy: . This is a critical role responsible for building, scaling, and evolving OnBuy's core commerce platform across both front-end and back-end systems. As a Senior Full Stack Engineer, you will own engineering delivery end-to-end; from customer-facing experiences to underlying services and data systems. You will operate within a cross-functional team and be accountable for shipping high-quality, scalable solutions that directly impact GMV, seller performance, and customer experience. This role moves beyond "front-end vs back-end " you are...

Agile Delivery Lead / Agile Coach (ERP / Transformation) Contract: £500-£550 per day + £100 per day retention bonus (Outside scope of IR35) Location: UK (hybrid) - 3 days on site Duration: 15 month contract Role overview We're supporting a major transformation programme seeking an experienced Agile Delivery Lead / Agile Coach to help stand up and optimise Agile delivery across a complex relex implementation. This role requires someone who can go beyond Agile theory , bringing clarity, structure, and measurable outcomes in a programme with defined requirements and delivery pressures. Key Responsibilities Establish and embed effective Agile ways of working across the programme Challenge and refine the use of Agile methodology to suit a structured ERP environment Ensure delivery of a Minimum Viable Product (MVP) while maintaining focus on business value Drive benefits realisation ensuring outcomes are tangible and measurable Work closely with internal...

Role: Security Architect / Security Consultant SC‑cleared (mandatory) £500 Outside ir35 Remote Start 18/04 End 3 Months initially - client has opportunity to extend Must be able to: Communicate clearly and confidently with senior stakeholders. Take ownership of workstreams. Operate independently — not be led by the client. Hold their own in discussions with technical and non‑technical stakeholders. Expected to work across different areas of DWP throughout the week. Skills & Experience Essential Strong background as a Security Architect or Senior Security Consultant. Ability to work autonomously and provide high‑level security guidance. Excellent communication and stakeholder‑management skills. Experience working in large government environments. Ability to translate complex technical concepts into clear business language. Comfortable working in a small, high‑trust team. Technical Exposure AWS (highly beneficial). DWP experience (strong advantage). Nice to Have Experience...

Senior DevOps Engineer (Azure / Terraform) £550–£650 per day | Outside IR35 | 6 Month Contract | Remote Overview An exciting opportunity has arisen for a Senior DevOps Engineer to join an established project delivering within a modern, cloud-first environment. You’ll be joining a lean, high-performing team, where DevOps is central to delivery not an afterthought. This role offers a high level of ownership, with the opportunity to shape infrastructure, improve reliability, and influence engineering best practices across the wider team. We’re looking for someone with deep Azure and Terraform expertise, who is comfortable operating in a hands-on capacity, while also mentoring others and driving improvements across CI/CD, observability, and security. Role & Responsibilities Design, build, and manage Azure infrastructure using Terraform, including modules, state management, and pipelines Develop and maintain CI/CD workflows (GitHub Actions, Azure DevOps or similar)...