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Hi, I’m Oleh Sysa, a frontend developer focused on TypeScript and Vue 3. I own features end-to-end, collaborating with backend and design to design architectures, implement, test, and ship production-ready software. I’ve led major refactors, shipped three products and a Chrome MV3 extension, and I’m comfortable switching frameworks. My background as an ICU nurse during wartime in Ukraine taught me resilience, rapid adaptation, and steady delivery under pressure. I also leverage AI tools to augment daily workflows while maintaining high-quality results.…Hi, I’m Oleh Sysa, a frontend developer focused on TypeScript and Vue 3. I own features end-to-end, collaborating with backend and design to design architectures, implement, test, and ship production-ready software. I’ve led major refactors, shipped three products and a Chrome MV3 extension, and I’m comfortable switching frameworks. My background as an ICU nurse during wartime in Ukraine taught me resilience, rapid adaptation, and steady delivery under pressure. I also leverage AI tools to augment daily workflows while maintaining high-quality results.

Oleh Sysa

Front-End Developer, Full Stack Developer, Web Developer, +2

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Hi, I’m Oleh Sysa, a frontend developer focused on TypeScript and Vue 3. I own features end-to-end, collaborating with backend and design to design architectures, implement, test, and ship production-ready software. I’ve led major refactors, shipped three products and a Chrome MV3 extension, and I’m comfortable switching frameworks. My background as an ICU nurse during wartime in Ukraine taught me resilience, rapid adaptation, and steady delivery under pressure. I also leverage AI tools to augment daily workflows while maintaining high-quality results.…Hi, I’m Oleh Sysa, a frontend developer focused on TypeScript and Vue 3. I own features end-to-end, collaborating with backend and design to design architectures, implement, test, and ship production-ready software. I’ve led major refactors, shipped three products and a Chrome MV3 extension, and I’m comfortable switching frameworks. My background as an ICU nurse during wartime in Ukraine taught me resilience, rapid adaptation, and steady delivery under pressure. I also leverage AI tools to augment daily workflows while maintaining high-quality results.

Available to hire

Hi, I’m Oleh Sysa, a frontend developer focused on TypeScript and Vue 3. I own features end-to-end, collaborating with backend and design to design architectures, implement, test, and ship production-ready software.

I’ve led major refactors, shipped three products and a Chrome MV3 extension, and I’m comfortable switching frameworks. My background as an ICU nurse during wartime in Ukraine taught me resilience, rapid adaptation, and steady delivery under pressure. I also leverage AI tools to augment daily workflows while maintaining high-quality results.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Ukrainian

Fluent

Russian

Fluent

English

Advanced

German

Intermediate

Work Experience

Frontend Developer (Contractor) at Engineering studio (client and product names under NDA)

May 1, 2023 - August 1, 2025

Owned end-to-end delivery of business-critical sections of a Vue 3 SPA for a flagship multichain DeFi platform: liquidity pools, yield farms, isolated-collateral money markets, analytics dashboards, and real-time user-position monitoring. Reduced initial page load from over a minute to 5–10 seconds by introducing a Pinia + localStorage TTL cache and multi-source token-price aggregation with BigInt-safe serialization; consolidated on-chain calls with a multicall layer. Unified wallet/connectors behind a single reactive API; migrated from ethers v5 to viem + Wagmi v2 and deployed a LayerZero v2 cross-chain UI across 6+ networks. Built a multi-step financial form flow with 3–4 cross-bound inputs and dynamic decimal handling, via a transaction-builder architecture that eliminated copy-paste across 8 flows. Delivered a Pinia-powered analytics dashboard with 8 chart types and 366-day rolling snapshots, and provided reusable UI primitives (adaptive dropdown, loaders, data tables). Refacto