Sergey T
Co-founder, CEO at DOO
Cyprus
Summary
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SeniorSergey T is an engineering leader and CEO with 15+ years designing, building, and operating large-scale backend systems for global platforms, and a proven track record of owning architecture end-to-end across payments, trust & safety, and identity. He has scaled teams from single digits to 15+, promoted engineers on both IC and management tracks, and maintained spotless operational records including zero production incidents for 18+ months. Technically hands-on, Sergey has implemented WebAuthn and SCIM servers from scratch, led zero-downtime payments modernization, and designed systems handling 350K+ RPS and tens of millions of monthly users. Comfortable across Java, microservices, AWS and secure protocols, he blends deep distributed-systems expertise with pragmatic product-aligned collaboration across security, compliance, and data teams. Now based in Cyprus and open to B2B or Upwork engagements, he pairs startup founder experience with enterprise-grade delivery discipline. An offbeat detail: despite professing a love of front-end JavaScript chaos on GitHub, his career footprint is firmly in resilient backend and security-critical infrastructure.
9 years of coding experience
18 years of employment as a software developer
English, RussianProgramming languages (1)
Github contributions (5)
H1cki/Homework
Feb 2017 - Oct 2018
Contributions:2 PRs, 5 pushes, 3 branches in 1 year 8 months
Varlamov-Sergey/astral-frontend
Apr 2021 - Sep 2022
Contributions:15 pushes, 2 branches in 1 year 4 months
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