Senior Backend Software Engineer at Joinfleek.com

Jack and Jill AI • london, england, United-Kingdom • Posted June 16, 2026

Location london, england

Job Type Full-time

Category IT & Technology

Posted June 16, 2026

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Job Title Senior Backend Software Engineer 
Company Description Joinfleek.com - Series B fashion-tech marketplace backed by a16z and YC 
Job Description You will architect the transaction layer for the world's first AI-native secondhand fashion marketplace. Reporting to the CTO, you will build scalable systems handling 500k+ items monthly, integrating proprietary computer vision models into core ecommerce flows. This is a high-impact role digitizing a $350B industry while diverting millions of garments from landfills. 
Location London, UK 
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