SCSergey Chaschin
@sergeychaschin
Senior Full Stack Engineer delivering scalable web platforms and integrated payment solutions.
ThailandWhat I'm looking for
I am a Senior/Lead Full Stack Engineer with 7+ years building scalable web platforms, from MVPs to enterprise applications. I focus on aligning technical solutions with business goals to improve user engagement and operational efficiency.
I have led migrations and refactors, integrated multiple payment providers, and designed modular architectures that enabled international launches and simplified maintenance. I champion pragmatic tool selection and CI/CD workflows to speed delivery and reduce technical debt.
My backend work includes Nest.js, PostgreSQL, Node.js, and integrations with Stripe, Xendit, and Airwallex; on the frontend I deliver rich interfaces with React, Vue, Nuxt, Next and modern Angular. I also build automation—onboarding flows, translation tooling, and error-catching systems—that frees developer time and stabilizes production.
I communicate through documentation and onboarding processes, mentor engineers, and run code reviews to maintain high quality. I am results-oriented, practical, and keen to join teams that value scalable engineering and measurable business impact.
Experience
Work history, roles, and key accomplishments
Lead Frontend Developer
Xtix
Mar 2025 - Present (11 months)
Integrated multiple payment providers and designed a modular multi-provider payment architecture to enable international launches; migrated ~60% of legacy AngularJS/early Angular to modern Angular and refactored core flows into modular components, improving maintainability and stability.
Product Engineer (Contract)
Xtix
May 2024 - Mar 2025 (10 months)
Led an internal automation project to remove developer involvement in client onboarding, defined requirements and roadmap, and delivered integrations that streamlined third-party service onboarding.
Backend Developer
Cue
Feb 2023 - May 2024 (1 year 3 months)
Enhanced service booking backend using Nest.js and PostgreSQL, improving system performance by ~30% and integrated Stripe for international payments to enable global transactions.
OZSenior Frontend Developer
Ozon
Jan 2021 - Oct 2022 (1 year 9 months)
Improved UI/UX and launched features with Nuxt/TSX that increased user engagement by ~30%; led Cypress end-to-end testing adoption and Sentry integration to reduce frontend errors and boost release reliability.
UPDelivered full-stack projects using Vue/React/Node and PostgreSQL, refactoring legacy apps to TypeScript to reduce bundle size and improve load speed, and built CRM and booking systems that streamlined client operations.
Frontend Developer
Tochka Bank
May 2016 - Jan 2019 (2 years 8 months)
Redesigned mobile interfaces and modernized legacy code, increasing mobile user engagement by 30% and reducing technical issues by ~25% through upgrades and code quality improvements.
Education
Degrees, certifications, and relevant coursework
Ural State College
Computing Machines and Network Complexes
2011 - 2013
Specialization in Computing Machines and Network Complexes completed from 2011 to 2013.
Ural State College
Land and Property Relations; Computing Machines and Network Complexes
2009 - 2013
Completed studies with specializations in Land and Property Relations and in Computing Machines and Network Complexes between 2009 and 2013.
Ural State College
2009 - 2011
Specialization period from 2009 to 2011 (part of overall studies at Ural State College).
Availability
Location
ThailandAuthorized to work in
Job categories
Skills
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