Andrii Kostromin

Available to hire

I'm Andrii Kostromin, a Senior Full Stack Engineer with 15+ years of experience building scalable web applications across healthcare, fintech/financial media, e-commerce, and enterprise sectors.

About

I’m Andrii Kostromin, a Senior Full Stack Engineer with 15+ years of experience building scalable web applications across healthcare, fintech/financial media, e-commerce, and enterprise sectors. I specialize in React, Node.js, PHP, and Python, designing robust REST and GraphQL APIs, and I routinely leverage AWS, Docker, PostgreSQL, and MySQL. I value clean architecture, scalable design, and clear collaboration with clients and teams.

I work directly with clients across time zones, gathering requirements, guiding architecture, and delivering demos at key milestones. I lead distributed teams of 5–15 engineers from discovery through production, owning code quality, architecture decisions, and delivery timelines, while emphasizing clear communication and thorough documentation.

  • 14 years' experience
  • Joined April 2026

Languages

  • EnglishAdvanced
  • UkrainianFluent
  • RussianFluent

Industry experience

  • Healthcare
  • Financial Services
  • Software & Internet
  • Media & Entertainment
  • Professional Services

More experts in Sofia, Bulgaria

Work experience· 10 roles

Team Lead · EPAM SystemsJul 2025 – Mar 2026 · 9 mos

Led frontend development using React component libraries; established and enforced development standards, ensuring code quality across the team; interviewed and onboarded new engineers; conducted regular code reviews and knowledge-sharing sessions.

Engineer · EPAM SystemsJul 2023 – Mar 2024 · 9 mos

Implemented GDPR-compliant webform submission with 3rd-party service integration; built a reusable plugin-based system for PDF generation and email dispatch across a multi-site factory; redesigned component architecture using Storybook and atomic design; improved SEO and accessibility scores via automated metatag generation and accessibility audit remediation.

Engineer · EPAM SystemsJan 2023 – Jun 2023 · 6 mos

REST API integration between Vue.js frontend, API gateway, and backend services; implemented OAuth2 authentication integration; upgraded legacy backend with full security audit and vulnerability remediation; managed deployments and CI/CD pipeline via Jenkins and GitHub.

Architect · EPAM SystemsNov 2022 – Dec 2022 · 2 mos
Team Lead · EPAM SystemsJul 2022 – Aug 2022 · 2 mos
Key Engineer · EPAM SystemsFeb 2021 – Jun 2022 · 1 yr 5 mos
Key Engineer · EPAM SystemsSep 2020 – Feb 2021 · 6 mos
Full Stack Developer · Smile (formerly Adyax)Jul 2017 – Jun 2019 · 2 yrs

Education

Master's degree · Petro Mohyla Black Sea State University2030 – 2026
Technical diploma · Nikolaev Building College2030 – 2026

Certifications and awards

AWS Cloud Developer (RS School)2025 – 2026
AI Literacy Program (EPAM)2024 – 2026
AI Masterclass Excellence (EPAM)2024 – 2026
Acquia Certified Developer – Drupal 92022 – 2026

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