Email: olehzinchenko.zo@gmail.com
LinkedIn: https://www.linkedin.com/in/olehzinchenko
GitHub 1: https://github.com/OlegZinch
GitHub 2: https://github.com/Oleg1983
Stack Overflow: https://stackoverflow.com/users/7551481/oleg-zinchenko
YouTube: https://www.youtube.com/@olegmaz3969

Frontend | Backend | React Native Engineer

Visa: Eligible to work in Ireland full-time (Stamp 4)

Experienced Frontend Engineer with 6.5+ years in React/Next.js and 2 years in React Native. Delivered production apps for fitness (BTWB) and payments (GoDaddy). Skilled in TypeScript and GraphQL.

(Jan 2024 – Present)

After relocating to Ireland, focused on professional development — completed over 10 Udemy certifications in React, Next.js, TypeScript, Node.js, PostgreSQL, MongoDB, Docker, Kubernetes, AWS, and Generative AI. Built several study projects to strengthen and update technical expertise.

SPD Technology — Lviv, Ukraine (Hybrid)
(Dec 2020 – Jan 2024)

Contributed to the development and maintenance of web and mobile applications that increased user engagement by 30%, working with modern front-end technologies and frameworks. Expanded expertise from web to mobile development through self-learning and practical implementation.

• Built and maintained web applications using Next.js SSR, React, TypeScript, Redux Toolkit, React Hooks, and GraphQL, with adherence to accessibility best practices and WCAG guidelines.
• Developed production-ready Next.js SSR app for CrossFit (programs.btwb.com), reducing load time by 40% via optimization, serving thousands of users.
• Contributed to a React Native project, closing mobile development tasks after self-learning the framework.
• Worked on Poynt Smart Terminal (GoDaddy) project – a fintech payment solution enabling secure in-store transactions – utilizing React, Cypress, and Pug (Jade) (Dec 2020 – Jun 2021).
• Received two salary raises in recognition of proactive self-learning and expanding technical expertise.

Skills used: Next.js, React, React Native, TypeScript, Redux Toolkit, GraphQL, Cypress, Pug
Professional growth: Transitioned successfully from web to mobile development, strengthened problem-solving skills, and demonstrated initiative in self-driven upskilling.

GlobalLogic — Lviv, Ukraine (On-site)
(Jun 2019 – Jan 2021)

Worked on developing single-page applications (SPAs) with React and Vue frameworks. Took ownership of front-end development for a medical project.

• Built and maintained SPA applications using React (Redux), React Hooks, and Vue (Vuex).
• Led the front-end development of an internal Medtronic project, creating a visualization tool for insulin pump test results.
• Mentored a junior developer in Vue.js, conducted regular code reviews, and provided best-practice guidance.
• Teamwork: Member of a 100-person team that delivered exceptional results on time and under budget 100% of the time.
• Gained hands-on experience in Python 3 and Jenkins (CI/CD) for automation tasks.

Skills used: React, Redux, Vue, Vuex, Python 3, Jenkins, Groovy, code reviews, mentoring
Professional growth: Enhanced leadership and mentoring abilities, broadened technical expertise beyond front-end development, and improved skills in automation and CI/CD processes.

Almira — Lviv, Ukraine (Remote)
(Dec 2017 – Jun 2019)

Developed cross-platform desktop and mobile applications, working with modern JavaScript frameworks and adapting quickly to new technologies. Expanded expertise from jQuery and basic JavaScript to advanced Angular and Electron development.

• Built desktop applications using Angular 2+, TypeScript, and Electron for Windows and macOS.
• Worked on React projects involving class-based components.

Skills used: Angular 2+, TypeScript, Electron, React
Professional growth: Strengthened adaptability in mastering new technologies, broadened development expertise across web, desktop, and mobile platforms.

• Core: JavaScript (ES6+), TypeScript
• Frontend: React/Next.js, HTML5/CSS3, Sass/Scss, Flexbox/CSS Grid, React Router, React Query (Tanstack Query), RESTful APIs, GraphQL, WebSockets, Framer Motion, Recharts, Webpack, Vite
• Backend: Node.js/Express, WebSockets, Pug
• UI libraries: React-Bootstrap, Bootstrap, Styled Components, Tailwind CSS, Material UI
• State Management: Redux Toolkit (RTK), React Context
• Mobile Development: React Native (Expo)
• Database: MongoDB, PostgreSQL, Supabase
• Testing: Jest, Vitest, Cypress
• Cloud & DevOps: AWS (S3, EC2, ECS, EKS), Docker, Kubernetes
• Tools & IDEs: Visual Studio Code, Cursor, Android Studio, Postman, MongoDB Compass, Figma
• Version Control: Git, GitHub
• Languages: English, Polish, Ukrainian

• Higher Education in Web Development and Promotion
  IT Step Academy, Lviv, Ukraine (Feb 2016 – Jul 2016)

• Master's Degree at NFQ Level 9 in Photonics, Laser Equipment, and Optical Fibre
  Lviv Polytechnic National University, Ukraine (Sep 2000 – Jul 2006)

• Successfully transitioned from frontend development to mobile development (React Native) at SPD Technology, proactively learning new skills and contributing to multiple projects simultaneously.
• Self-taught in Next.js to build a production-ready SSR application, impressing clients with the ability to quickly adopt and implement new technology. This dedication to upskilling was recognised at SPD Technology with two salary increases after mastering both Next.js and React Native.
• Became the first developer in a 100+ person team at GlobalLogic to work with Vue.js, later mentoring a junior developer in the same framework.

• 2025 — The Ultimate React Course 2025: React, Next.js, Redux & More, Udemy
• 2025 — SQL and PostgreSQL: The Complete Developer's Guide, Udemy
• 2025 — Local LLMs via Ollama & LM Studio - The Practical Guide, Udemy
• 2025 — Docker & Kubernetes: The Practical Guide [2025 Edition], Udemy
• 2025 — AWS Certified Cloud Practitioner CLF-C02, Udemy
• 2025 — MongoDB - The Complete Developer's Guide 2024, Udemy
• 2024 — JavaScript Unit Testing - The Practical Guide, Udemy
• 2024 — Node.js, Express, MongoDB & More: The Complete Bootcamp 2024, Udemy
• 2024 — ChatGPT, Midjourney, DALL-E 3 & APIs - The Complete Guide, Udemy
• 2023 — Cypress End-to-End Testing - Getting Started, Udemy
• 2023 — React Native - The Practical Guide, Udemy
• 2022 — Git & GitHub - The Practical Guide, Udemy
• 2022 — Understanding TypeScript - 2022 Edition, Udemy
• 2022 — Next.js & React - The Complete Guide (incl. Two Paths!), Udemy
• 2022 — GraphQL by Example, Udemy
• 2021 — React - The Complete Guide (incl Hooks, React Router, Redux), Udemy
• 2020 — React + Redux - Professional Development, Udemy
• 2016 — Responsive Website Basics: Code with HTML, CSS, and JavaScript, University of London

Full list of 28 certifications available on LinkedIn.

• Active contributor on GitHub & Stack Overflow.
• Enjoys reading technical blogs and staying updated on the latest AI and web development trends.
• Passionate about fitness & CrossFit, which aligns with professional experience in sports-related applications.
• Volunteering: Assisted an Irish charity organisation in Enniscorthy with packing and loading Christmas gift boxes prepared by Irish children for children in Ukraine.

Excellent references can be provided upon request.