Senior Backend Software Engineer (£100k–£140k + Equity) at Fleek

Job Title

Senior Backend Software Engineer

Salary

£100k–£140k + Equity

Company Description

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.

Location

London, UK

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.

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