Gleb Kostyunin
Senior Frontend Developer at Izzy Stuff
Leipzig, Saxony, Germany
Summary
👤
Senior🎓
Top SchoolGleb Kostyunin is a Senior Frontend Developer with 11 years of experience building high-performance, scalable storefronts and component libraries for global brands. He has led critical replatforming efforts—most notably migrating Harrods.com to a Vue/Nuxt + Tailwind stack serving 400k+ SKUs across 100+ countries—and delivered measurable business impact for clients like FC Bayern (double-digit lifts in sales and conversion). Comfortable in both consultancy and in-house roles, he combines hands-on engineering (Vue, React, TypeScript, Cypress testing) with stakeholder-facing presentation and alignment skills for large cross-functional audiences. Gleb runs a Germany-registered B2B consultancy, is open to international contracts, and has contributed testing infrastructure to prominent open-source projects such as react-styleguidist. He brings an operator’s mindset from earlier product and marketing roles, which helps him translate business goals into resilient front-end architectures.
11 years of coding experience
13 years of employment as a software developer
specialist Crisis Managment, specialist Crisis Managment at Finance University under the Government of the Russian Federation
English, German, Russian, Czech
Stackoverflow
3,813reputation
198kreached
73answers
8questions
javascript
top-5%
cypress
top-5%
testing
top-5%
Github Skills (17)
styles10
styleguidist10
cypress10
testing10
react10
test-automation10
javascript9
html6
integration-testing6
bootstrap-modal6
nodejs6
modal-dialog6
css6
twitter-bootstrap6
react-native6
Programming languages (3)
Github contributions (5)
styleguidist/react-styleguidist
Feb 2018 - Aug 2018
Isolated React component development environment with a living style guide
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:8 commits, 7 PRs, 21 comments in 6 months
Contributions summary:Gleb primarily focused on adding and improving the testing infrastructure for the React Styleguidist project. They set up Cypress for end-to-end testing, writing tests for core features and individual components, and improved the testing coverage. The user's work included creating and modifying Cypress test files, focusing on testing component behavior and user interface interactions.
react-componentreactstyle-guidestyleguidestyled-components
glebez/gleb.works
Jan 2019 - Feb 2023
personal page inspired by retro game dialogues
Contributions:2 PRs, 28 pushes, 2 branches in 4 years 1 month
dialoguespersonal-pageretro-gameretro
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