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Denys Rachynskyi

@denysrachynskyi

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Senior Frontend Engineer specializing in React and TypeScript, delivering scalable user-centric web solutions.

Poland

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What I'm looking for

I’m seeking a collaborative team where I can lead frontend architecture, build scalable React/TypeScript products, and improve performance and observability.

I am a Senior Frontend Engineer with 7+ years of experience building performant, maintainable web applications using React and TypeScript. I design architectures, implement core features, and optimize code for scalability and reliability across multiple products.

I have led projects from scratch, integrated third-party services, implemented telemetry and observability, and collaborated closely with onsite teams and customers to ensure alignment and delivery. My work emphasizes testing, performance, and developer experience.

I bring strong expertise in modern frontend tooling and libraries (Next.js, Redux/RTK-Query, React-Query, Storybook, Jest, Cypress) and a pragmatic, team-oriented approach focused on shipping high-quality user-centric solutions.

Experience

Work history, roles, and key accomplishments

Senior Frontend Engineer

Betterme

Feb 2024 - Jul 2025 (1 year 5 months)

Created a personal coach training platform from scratch using modern Next.js features, implemented core functionality, third-party integrations, and telemetry to ensure scalability and stability.

React Next.js TypeScript Redux OpenTelemetry Sentry AWS Jest

Senior Frontend Engineer

EPCNetwork

Nov 2023 - Feb 2024 (3 months)

Built automation-focused features and custom marketing widgets, improved CSV pipeline processing and refactored code to boost application performance and reliability.

React TypeScript Redux Storybook CSS Modules Formik Jest AWS

Frontend Engineer

Provectus

Apr 2022 - Aug 2023 (1 year 4 months)

Developed and optimized core components and major features for AI-related products, improving performance and driving product enhancements while collaborating with onsite teams and customers.

TypeScript React Redux styled components Jest React Testing Library Yarn

Middle Frontend Developer

AgileEngine

Jan 2019 - Jan 2022 (3 years)

Designed and optimized key components for analytics and visualization platforms, remediated memory leaks, and delivered features that improved performance and user engagement.

JavaScript TypeScript React Redux MobX)styled components Jest Webpack

Javascript Developer

SharkSoftware

Sep 2018 - Feb 2019 (5 months)

Developed features and fixed bugs across multiple NDA projects including a gamer marketplace and workflow automation hub using React, Vue.js and Next.js technologies.