Oleg Stakhniuk
Oleg Stakhniuk

Senior Frontend Engineer

Open to offers · Member since 26 Oct 2026
Location
Ukraine
Desired salary
Unspecified
Work preference
Remote Only / Full Time
Experience level
Senior

About

Professional summary

I am a Senior Frontend Engineer with more than five years of experience building fintech products where reliability, performance, and transaction accuracy are critical. I specialize in payment and card flows, KYC onboarding, digital wallets, real-time trading interfaces, and blockchain-based payment rails.

I take products from an initial business idea through requirements discovery, MVP scoping, frontend architecture, release, and production support. I work directly with clients and technical stakeholders to turn product needs into practical, maintainable solutions.

My strongest frontend technologies are Angular and React, with additional production experience in Next.js, Vue, Nuxt, and NestJS. I have led frontend teams, distributed work across engineers, reviewed code, and mentored junior and mid-level developers.

I have delivered fintech and crypto products involving VISA and MasterCard features, stablecoins, EVM, Solana, TON, token sales, vesting, DEX trading, and wallet integrations. My work includes transaction simulation, real-time market data, TradingView charts, and secure authentication flows.

I also use AI-assisted engineering tools, including Claude Code, Cursor, and OpenCode, for research, prototyping, implementation, and unit-test generation. I retain ownership of architecture, technical decisions, and code review while using these tools to improve delivery speed.

Skills

23 capabilities

Tech stack & tools

Working toolkit

Development

Languages & Frameworks

Libraries

Monitoring

Experience

Career history

Senior Frontend Engineer / Frontend Lead Lazy Ants MANAVA

Led frontend development for a fintech and gaming platform serving approximately 500,000 users. Managed a team of three frontend engineers, worked with Angular and NestJS, and contributed to requirements definition, task allocation, code review, and mentoring.

Built an AI support agent in React that explains user balances, transactions, and rewards using account context. Designed it as an embeddable widget with a TypeScript SDK for web, Telegram Mini Apps, and native mobile delivery, and implemented end-to-end localization with Tolgee across the NestJS backend and Angular frontend.

Sole Frontend Engineer Token Trading Platform (NDA)

Delivered a token launch and trading platform from scratch as the sole frontend engineer in a three-person team. Implemented Web2 and wallet-based authentication, token creation, trading against the platform smart contract, and DEX trading after token migration.

Added transaction simulation before signing to help users identify failing transactions before paying network fees. Independently obtained and integrated TradingView Charting Library, with real-time price streaming through Socket.IO.

Frontend Engineer / Technical Lead GEME

Led frontend development from scratch for a non-custodial multichain digital wallet delivered through Telegram. Built transaction, asset-tracking, and real-time balance functionality across EVM, Solana, and TON networks.

Handled Telegram WebView differences across iOS and Android. Established coding standards, assigned and explained refactoring work, and reviewed code for a team of one to two engineers.

Frontend Engineer Clarnium

Owned the complete token-sale and IDO experience for a token analytics and launchpad platform with more than one million users. Delivered deposit and payment flows, smart-contract and checkout-provider integration, vesting rounds, token claims, quests, and community-program features.

Migrated the live frontend from Nuxt 2 to Nuxt 3 and introduced an asset-handling workflow that reduced staging-to-production release time from approximately one hour to 15 minutes. The token sale raised $300,000 in investment.

Frontend Engineer Lot Trade

Worked on a crypto trading competition platform using Angular. Integrated BNB Smart Chain for staking, wallet authorization, and blockchain transactions.

Built real-time trading charts and contributed to frontend functionality for the trading experience.

Education

Learning history
No education data available.

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