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🥝 Senior Backend Engineer - AI-Driven Marketplace

Jack & Jill/External ATS | london, United-Kingdom | Posted June 20, 2026

Job Description

A leading fashion tech startup in London is seeking a Senior Backend Software Engineer to architect transaction systems for their AI-native secondhand fashion marketplace. You'll work on scalable systems integrating AI models into ecommerce, impacting the $350B industry. The ideal candidate has 3–6 years of experience with Node.js and TypeScript, and is product-minded, focusing on user experience. This role offers significant mentorship opportunities and involves leading a senior squad within a rapidly growing team.
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