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I am a frontend developer with 4 years of experience building and scaling cross-platform applications using React and React Native. I have delivered production-ready apps across diverse industries including green tech, social platforms, agriculture, and construction. Skilled in design review and translating Figma prototypes into clear, backend-ready API specifications. I have experience extracting business logic from UI flows and shaping it into actionable API contracts, enabling smooth handoffs to backend developers and ensuring alignment across product, design, and engineering. I am also experienced in automated testing, performance optimization, and close collaboration with developers, designers, and QA teams throughout the product lifecycle.…I am a frontend developer with 4 years of experience building and scaling cross-platform applications using React and React Native. I have delivered production-ready apps across diverse industries including green tech, social platforms, agriculture, and construction. Skilled in design review and translating Figma prototypes into clear, backend-ready API specifications. I have experience extracting business logic from UI flows and shaping it into actionable API contracts, enabling smooth handoffs to backend developers and ensuring alignment across product, design, and engineering. I am also experienced in automated testing, performance optimization, and close collaboration with developers, designers, and QA teams throughout the product lifecycle.

Mark Duchynskiy

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

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I am a frontend developer with 4 years of experience building and scaling cross-platform applications using React and React Native. I have delivered production-ready apps across diverse industries including green tech, social platforms, agriculture, and construction. Skilled in design review and translating Figma prototypes into clear, backend-ready API specifications. I have experience extracting business logic from UI flows and shaping it into actionable API contracts, enabling smooth handoffs to backend developers and ensuring alignment across product, design, and engineering. I am also experienced in automated testing, performance optimization, and close collaboration with developers, designers, and QA teams throughout the product lifecycle.…I am a frontend developer with 4 years of experience building and scaling cross-platform applications using React and React Native. I have delivered production-ready apps across diverse industries including green tech, social platforms, agriculture, and construction. Skilled in design review and translating Figma prototypes into clear, backend-ready API specifications. I have experience extracting business logic from UI flows and shaping it into actionable API contracts, enabling smooth handoffs to backend developers and ensuring alignment across product, design, and engineering. I am also experienced in automated testing, performance optimization, and close collaboration with developers, designers, and QA teams throughout the product lifecycle.

Available to hire

I am a frontend developer with 4 years of experience building and scaling cross-platform applications using React and React Native. I have delivered production-ready apps across diverse industries including green tech, social platforms, agriculture, and construction. Skilled in design review and translating Figma prototypes into clear, backend-ready API specifications.

I have experience extracting business logic from UI flows and shaping it into actionable API contracts, enabling smooth handoffs to backend developers and ensuring alignment across product, design, and engineering. I am also experienced in automated testing, performance optimization, and close collaboration with developers, designers, and QA teams throughout the product lifecycle.

Skills

Experience Level

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Work Experience

Frontend Developer at Farmable

January 1, 2024 - Present

Worked at a Norwegian agri-tech startup helping farmers manage fieldwork and compliance. Streamlined developer workflows in the React Native app, rebuilt the web platform finishing three months ahead of schedule, and updated legacy codebase to the latest Expo SDK. Migrated from bare workflow to Expo Prebuild, reducing native configuration overhead and cutting new developer onboarding time by 35%. Migrated to Apollo Codegen for strongly-typed GraphQL schemas, decreasing GraphQL runtime errors by 15.3%. Implemented Detox UI tests to cover critical user flows, reducing post-release bug reports by 9%.

Frontend Developer at Donut

November 30, 2023 - August 27, 2025

Contributed to a social platform designed to help people donate to nonprofits and support local communities. Joined at inception and led full product lifecycle including project setup, tech stack selection, development, testing, and App Store launch. Set up a Firebase CI/CD pipeline, accelerating development by 5.8%. Simplified and streamlined user registration workflow, improving conversion by 14.7%. Customized Firebase Analytics to track user flows and feature usage, increasing adoption by 16.7%.

Frontend Developer at Green Badger LEED Automation

December 1, 2022 - August 27, 2025

Worked on a U.S.-based SaaS platform simplifying LEED compliance documentation for construction companies. Developed the mobile app using MVVM architecture to streamline data entry, compliance tracking, and reporting. Implemented adaptive layouts for tablets and phones, which increased positive UI feedback by 11.7%. Expanded test coverage from ~1,900 to ~2,300 cases, improving reliability and reducing QA turnaround time by 8%. Developed advanced keyboard handling that eliminated all keyboard-related bugs and resolved longstanding user complaints.