At a Glance
- Tasks: Own the ecommerce journey, building backend systems for payments and seller tools.
- Company: Join Fleek, a fast-growing startup transforming the secondhand fashion market.
- Benefits: Competitive salary, equity options, and a chance to make a real impact.
- Other info: Be part of a dynamic team in a rapidly scaling environment.
- Why this job: Tackle unique challenges with AI tech while saving millions of items from landfills.
- Qualifications: 6-10 years backend experience, ideally with Node.js and TypeScript.
The predicted salary is between 100000 - 140000 £ per year.
Fleek is a ~$50M Series B startup backed by a16z and Y Combinator, building the AI-native infrastructure for the $350B global secondhand fashion market.
You will join the Growth squad to own the core ecommerce journey, building backend systems for discovery, payments, and seller tools. Reporting to the CTO, you'll integrate the proprietary FleekSort AI classification engine into a marketplace handling millions of items. This role is about digitizing a broken, manual supply chain at global scale.
Why this role is remarkable:
- Work on a genuinely novel technical challenge by integrating FleekSort, a custom AI model (not a GPT wrapper) that digitizes opaque secondhand inventory.
- Join a hyper‑growth company tripling year‑on‑year with ~$50M in funding from top‑tier investors like a16z, Y Combinator, and HV Capital.
- Deliver massive environmental impact by building systems that have already saved 9 million items from landfills and are scaling to serve thousands of global retailers.
What You Will Do:
- Architect and own the end‑to‑end ecommerce journey, including item discovery, search, multi‑currency payment systems, and credit infrastructure.
- Design and scale backend services to handle over 1 million unique items per month, connecting AI grading engines to real‑time marketplace workflows.
- Collaborate in a senior product squad to translate complex international logistics and supply chain challenges into reliable, high‑performance software.
The ideal candidate:
- Has 6‑10 years of professional backend experience, ideally using Node.js and TypeScript, with a proven track record of shipping high‑traffic production systems.
- Possesses a product engineering mindset from a consumer‑facing marketplace or fintech background, focusing on commercial outcomes rather than just infrastructure.
- Thrives in early‑stage, fast‑paced environments (Seed to Series B) and utilizes AI tools like Cursor or Copilot as a force multiplier in their workflow.
Senior Backend Software Engineer (£100k–£140k + Equity) at Fleek in London employer: Jack & Jill
Fleek is an exceptional employer, offering a dynamic work environment in London where innovation meets sustainability. As a rapidly growing startup backed by top-tier investors, employees have the opportunity to work on groundbreaking AI technology that is transforming the secondhand fashion market while making a significant environmental impact. With competitive salaries, equity options, and a culture that fosters collaboration and personal growth, Fleek is dedicated to empowering its team members to thrive in their careers.
