At a Glance
- Tasks: Design and build a revolutionary AI-powered marketplace for secondhand goods.
- Company: Join a forward-thinking fashion tech company tackling waste in the industry.
- Benefits: Competitive salary up to £140k, dynamic work environment, and growth opportunities.
- Other info: On-site role in London with a collaborative, fast-paced team.
- Why this job: Make a real impact on sustainability while shaping the future of e-commerce.
- Qualifications: 3-6 years backend engineering experience and a passion for product innovation.
The predicted salary is between 60000 - 80000 £ per year.
The fashion industry is broken. Billions of garments end up in landfill, not because they're unwanted, but because the supply chain for secondhand goods is offline and inefficient. We're building the AI‑powered infrastructure to fix this, making secondhand the first choice globally. Our platform has already saved millions of items from landfill, and we're backed by leading VCs with significant funding to tackle a market projected to reach hundreds of billions.
This isn't another standard e-commerce role. You'll join a small, senior product engineering squad, owning the entire marketplace journey from discovery to checkout. Every item is unique, inventory is unpredictable, and quality is graded by our proprietary AI. You'll design how the transaction layer works for a market that hasn't existed before, integrating AI directly into the product experience. This role is for a product‑obsessed builder who wants to define, not just execute, in a hyper‑growth environment. It's not for those seeking narrow, siloed ownership or a slow‑paced, spec‑driven environment.
The work
- Design and build the core marketplace backend, from item discovery and search to checkout, payments, and post‑purchase. Your features will directly drive GMV.
- Integrate our proprietary AI classification engine directly into the product, ensuring seamless grading, pricing, and categorisation for unique items.
- Architect systems to scale from 500K+ items per month to millions, making pragmatic trade‑offs between speed and long‑term scalability.
- Shape technical direction and engineering standards for a rapidly growing team, challenging assumptions and proposing innovative solutions.
- Work embedded with product and design, translating complex real‑world logistics into reliable, scalable software.
What You Bring
- 3‑6 years of professional backend engineering experience, shipping production systems that handle real traffic and money.
- Strong fundamentals in system design, data modelling, and API architecture.
- Proficiency in Node.js/TypeScript, or a comparable stack with willingness to transition.
- A background in consumer tech (marketplace, fintech, or consumer product), building for end‑users at scale.
- A product engineering mindset: you connect technical decisions to commercial outcomes and thrive in ambiguous, fast‑paced startup environments.
- You've built AI capabilities or are eager to integrate AI deeply into product.
This is an on‑site role in London, 5 days a week.
Senior Product Engineer (up to £140k) employer: Dex
Join a pioneering early-stage venture-backed company at the forefront of building foundation models for extreme physics, where you will have the unique opportunity to shape the engineering culture from day one. With a strong focus on innovation and collaboration, this role offers competitive compensation, a dynamic work environment, and the chance to contribute to critical advancements in global infrastructure and energy. You'll be part of a small, research-heavy team that values your expertise and encourages personal growth, making it an excellent place for those looking to make a meaningful impact.
