Yevhen

Yevhen Zanko
Senior Frontend Developer · React, TypeScript
Lublin, Poland [відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація»)
github.com/sedrik124679

SUMMARY
Frontend Developer with 4+ years of experience building SaaS products, Jira Marketplace apps and a large-scale CRM
platform with React and TypeScript. Led a zero-downtime migration of a production Marketplace app to Atlassian Forge,
including a full rewrite from Vue.js to React. Experienced in frontend architecture, performance optimization for large
datasets, and leading teams of up to 6 developers.

SKILLS
Core React, TypeScript, JavaScript (ES6+), HTML5, CSS3
State & data Redux Toolkit, React Query, Zustand, REST APIs
UI MUI, Atlaskit, AG Grid, data visualization, dashboards, complex data tables
Testing Jest, Vitest
Platforms Atlassian Forge, Atlassian Connect, Jira Cloud, Chrome Extensions
Backend Node.js, Express, MongoDB
Tools Git, Bitbucket, Jira, Azure DevOps
AI tools Claude Code

EXPERIENCE
Frontend / Full Stack Developer, Team Lead · SaaSJet Jun 2022 – Present
Led the migration of Time in Status (Jira Marketplace app) from Atlassian Connect to Forge with zero downtime
and no customer churn; the switch was invisible to users.
As part of the migration, rewrote the entire frontend from Vue.js to React, eliminating a large share of
accumulated technical debt.
Design frontend architecture and implement product features in React and TypeScript.
Built Jira Marketplace apps and Chrome Extensions; contributed to Node.js backend services.
Lead a team of up to 6 developers: code reviews, mentoring, merge strategy and release process.
Own the technical roadmap and release planning together with the product team.

Frontend Developer · Freelance, CRM platform (part-time) Jun 2023 – Dec 2025
Developed and maintained a large-scale CRM platform with complex business logic, dashboards, data tables and
user management.
Owned technical decisions: technology selection, application architecture and libraries for long-term scalability.
Built interactive dashboards, analytics views and reporting modules.
Optimized performance on large datasets with lazy loading, caching, pagination and efficient state management.
Refactored legacy code, reduced bundle size and improved rendering performance of complex interfaces.
Worked with backend developers on API design and integrations.

EDUCATION LANGUAGES
West Ukrainian National University Ukrainian: Native
Computer Engineering English: Upper-Intermediate (B2)