All Fellows

Moscow, Russia
Zakhar Poselkov
Backend EngineerSoftware ArchitectTeam Lead
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About
I build Go services that stay fast under real traffic — payments, credit, and real-time targeting for millions of users. I also untangle AI-built apps that got too messy to ship.
Behind me is a small dev team ready for anything bigger. Clean code, clear communication, and no late surprises.
Open to
Projects, consultations, and collaborations — solo for backend and rescue work, with my team for full builds.
Always open to talking with agencies and founders who need somewhere to hand overflow work.
Project Highlights
Built a real-time personalization systemthat reacts to user behavior instantly for 3M+ users
Cut ad-selection latency to ~3mswith bitmap logic, filtering 300K+ creatives at 20K RPS
Built installment and credit services for a marketplace:scoring, payment schedules, repayments
Kept a payment gateway stablethrough seasonal sales peaks at 40K requests per second
Rebuilt AI-generated apps into codebasesthat can ship features again, without a full rewrite