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