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I’m Ihor Ovsianykov, a full-stack developer focused on building reliable backend systems and production-ready web interfaces. I work extensively with Node.js and TypeScript, designing transaction flows and integration layers that connect multiple crypto networks and third-party services while keeping performance, scalability, and maintainability in mind. In recent roles, I’ve developed crypto payment and custody/compliance infrastructure (including exchange integrations and wallet tooling), and I’ve also modernized frontends by migrating legacy UI to React with consistent component design. I enjoy creating reusable integration patterns, improving operational resilience with idempotency and locking, and delivering polished SaaS experiences such as real-time webhook debugging with strong security considerations.…I’m Ihor Ovsianykov, a full-stack developer focused on building reliable backend systems and production-ready web interfaces. I work extensively with Node.js and TypeScript, designing transaction flows and integration layers that connect multiple crypto networks and third-party services while keeping performance, scalability, and maintainability in mind. In recent roles, I’ve developed crypto payment and custody/compliance infrastructure (including exchange integrations and wallet tooling), and I’ve also modernized frontends by migrating legacy UI to React with consistent component design. I enjoy creating reusable integration patterns, improving operational resilience with idempotency and locking, and delivering polished SaaS experiences such as real-time webhook debugging with strong security considerations.

Ihor Ovsianykov

Full Stack Developer, Back-End Developer, Web Developer, +3

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I’m Ihor Ovsianykov, a full-stack developer focused on building reliable backend systems and production-ready web interfaces. I work extensively with Node.js and TypeScript, designing transaction flows and integration layers that connect multiple crypto networks and third-party services while keeping performance, scalability, and maintainability in mind. In recent roles, I’ve developed crypto payment and custody/compliance infrastructure (including exchange integrations and wallet tooling), and I’ve also modernized frontends by migrating legacy UI to React with consistent component design. I enjoy creating reusable integration patterns, improving operational resilience with idempotency and locking, and delivering polished SaaS experiences such as real-time webhook debugging with strong security considerations.…I’m Ihor Ovsianykov, a full-stack developer focused on building reliable backend systems and production-ready web interfaces. I work extensively with Node.js and TypeScript, designing transaction flows and integration layers that connect multiple crypto networks and third-party services while keeping performance, scalability, and maintainability in mind. In recent roles, I’ve developed crypto payment and custody/compliance infrastructure (including exchange integrations and wallet tooling), and I’ve also modernized frontends by migrating legacy UI to React with consistent component design. I enjoy creating reusable integration patterns, improving operational resilience with idempotency and locking, and delivering polished SaaS experiences such as real-time webhook debugging with strong security considerations.

Available to hire

I’m Ihor Ovsianykov, a full-stack developer focused on building reliable backend systems and production-ready web interfaces. I work extensively with Node.js and TypeScript, designing transaction flows and integration layers that connect multiple crypto networks and third-party services while keeping performance, scalability, and maintainability in mind.

In recent roles, I’ve developed crypto payment and custody/compliance infrastructure (including exchange integrations and wallet tooling), and I’ve also modernized frontends by migrating legacy UI to React with consistent component design. I enjoy creating reusable integration patterns, improving operational resilience with idempotency and locking, and delivering polished SaaS experiences such as real-time webhook debugging with strong security considerations.

Skills

Experience Level

Expert

Expert

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Expert

Intermediate

Beginner

Language

English

Advanced

Ukrainian

Fluent

Work Experience

Full-Stack Developer (Node.js, TypeScript) at YamSoft

December 1, 2024 - Present

Developed and maintained crypto payment infrastructure for a platform with 10K+ wallets using Node.js and TypeScript. Implemented transaction flows across TRON, Bitcoin, and Ethereum, including manual and automated buy, sell, send, receive, and swap operations. Integrated cryptocurrency custody and compliance infrastructure with Fireblocks, Sumsub, and GetID, and worked on exchange integrations with Kraken and XBO. Designed reusable integration solutions across providers, improving consistency and reducing implementation effort. Improved scalability and reliability via idempotent transaction processing, Redis-based distributed locks, and performance optimizations. Designed and optimized MySQL persistence layers using TypeORM. Modernized the frontend by migrating legacy interfaces to React and MUI. Built an MCP server for the wallet platform so AI assistants can interact with wallet functionality through standardized tools and workflows.

Backend/Full-Stack Developer (Node.js) at Peanut Trade

April 1, 2024 - October 1, 2024

Built and maintained NestJS microservices in a distributed backend architecture. Integrated SUI and KAIA blockchain networks with chain-specific transaction flows to expand cross-chain capabilities. Designed and optimized integrations with cryptocurrency exchange APIs. Implemented Redis-based caching, inter-service communication, and RabbitMQ-based asynchronous messaging. Optimized complex MySQL queries and indexing for large statistical datasets, reducing query time from ~5 minutes to ~10 seconds. Designed and optimized Solidity smart contracts with a focus on gas efficiency and project requirements.

Full-Stack Developer (Node.js, TypeScript) at FlexoForge

October 1, 2023 - April 1, 2024

Developed and maintained full-stack web applications using Node.js, TypeScript, NestJS, React, and MUI. Built a coupon and deals platform with offer management plus user and admin functionality. Implemented restaurant management features including menus, offers, and business administration. Integrated Stripe payments including Apple Pay and Google Pay and handled related backend payment flows. Developed a customer support and messaging module with conversations, notifications, and administrative controls. Implemented cloud-based file/image storage and optimized application performance. Set up CI/CD pipelines with GitHub Actions for automated build, testing, and deployment.