Вадим

Vadym Halahan Professional Summary

Senior Full Stack Developer Senior Full Stack Developer who architected enterprise e-
commerce platform (MyPrint) and led web development for
[open contact info](look above in the "contact info" section) 100K+ user micro-investing app (Raiz Invest). 6+ years
commercial experience building scalable React Native, Next.js,
[open contact info](look above in the "contact info" section)
and NestJS applications. Expert in application architecture,
github.com/Fukuro5 performance optimization (3x load time improvements), and
leading cross-functional teams to deliver user-centered
t.me/galagan_vadim
solutions with clean, testable TypeScript code.

EDUCATION WORK EXPERIENCE
Software Engineering, Senior Full-Stack Developer, MyPrint
Zhytomyr State Technological University 02/2025 – 04/2026
2020 – 2023 | Zhytomyr Solo-architected complete large-scale e-commerce
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ecosystem (5 interconnected applications) as sole full-stack
Software Engineering,
developer;
Zhytomyr Technological College of KNUBA
Designed PostgreSQL database schemas, NestJS APIs, and NX
2016 – 2020 | Zhytomyr
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monorepo—cut deployment time 60%;
Delivered end-to-end ownership: architecture, features,
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SKILLS optimization, testing, deployment, maintenance;
Tech Stack: React, NextJS, TypeScript, NestJS, PostgreSQL,
TypeScript
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NX Monorepo, Mantine.
React
Raiz Invest (Web App Tech Lead), Onix-Systems
React Native 11/2022 – 01/2025
Redux Served as Web App Tech Lead for Australia's popular micro-
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investing platform serving 100K+ users;
NextJS Led feature planning meetings, React/​Redux bug fixes, code
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NodeJS reviews, and production releases for the web application;
Drove technical direction for the web app using
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NestJS comprehensive experience and knowledge following world-
PostgreSQL class best practices;
Tech Stack: React, Redux, TypeScript, Firebase.
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LANGUAGES Weere, Onix-Systems
Ukrainian 06/2022 – 10/2022
Fluent Enhanced live streaming + video calls for 50K+ member
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community platform post-launch;
English Fixed critical bugs and boosted app performance 40%
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C1 through code optimizations;
Tech Stack: React Native, Redux, GraphQL.
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Gather My Crew, Onix-Systems
04/2021 – 05/2022
Built Slack-style platform tripling volunteer engagement
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across 25+ nonprofit organizations;
Engineered real-time workspaces, event calendar, task
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management—boosted coordination 3x;
Managed full delivery lifecycle from feature spec to App Store
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deployment at 99% uptime;
Tech Stack: React Native, Redux, Firebase, NestJS.
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Duscholux, Onix-Systems
09/2020 – 03/2021
Architected unified codebase powering 4 department apps (2
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desktop, 1 mobile, 1 tablet) for 500+ users;
Delivered tailored workflows via GraphQL APIs—cut
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development overhead 60% through code reuse;
Streamlined enterprise operations across 4 departments with
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consistent UX;
Tech Stack: React Native, React Native Windows, GraphQL.
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Cake Trader, Spasehub coworking
03/2020 – 08/2020
Built realistic market engine for strategy backtesting with
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10K+ simulated trades;
Created portfolio analytics dashboard tracking performance/​
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risk metrics across 50+ assets;
Added CSV import/​export, reducing user setup time 70%;
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Tech Stack: React, Redux, Ant Design, ApexCharts.
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