Full-Stack Developer with 5+ years of experience building and scaling web & mobile products. I've delivered 10+ production-ready applications, including cross-platform mobile apps, improved performance by up to 40%, and reduced load times 2–3x through smart architecture and optimization. Currently open to new opportunities. From idea to launch - I design systems, build features, and ship reliable products across web and mobile that actually work in real-world environments I work across the full stack using React / Next.js - building fast, user-focused interfaces with JavaScript / TypeScript and scalable backends with Node.js (NestJS, Express). I’ve designed and implemented APIs handling thousands of requests daily, working with PostgreSQL, MySQL, MongoDB, and Redis, and integrating services like Stripe, OpenAI, Google Maps, Firebase, and AWS. On the mobile side, I develop cross-platform applications using React Native (CLI & Expo) for IOS and Android, integrating cloud services like Firebase, Supabase, and AWS, and delivering smooth, production-ready user experiences. I also have strong experience in cloud and DevOps, deploying and maintaining applications with AWS, Docker, CI/CD pipelines, and platforms like Vercel and Firebase - ensuring reliability, scalability, and smooth delivery processes. I enjoy owning the full development lifecycle - from architecture and planning to deployment and optimization. As a developer, I’m detail-oriented and thoughtful in my approach. I prefer well-structured, scalable solutions over quick fixes, and I’m comfortable diving deep into complex problems to find the best possible outcome. I value clear communication, responsibility, and consistent progress in both team environments and independent work.

Oleksandr Sasiuk

Full-Stack Developer with 5+ years of experience building and scaling web & mobile products. I've delivered 10+ production-ready applications, including cross-platform mobile apps, improved performance by up to 40%, and reduced load times 2–3x through smart architecture and optimization. Currently open to new opportunities. From idea to launch - I design systems, build features, and ship reliable products across web and mobile that actually work in real-world environments I work across the full stack using React / Next.js - building fast, user-focused interfaces with JavaScript / TypeScript and scalable backends with Node.js (NestJS, Express). I’ve designed and implemented APIs handling thousands of requests daily, working with PostgreSQL, MySQL, MongoDB, and Redis, and integrating services like Stripe, OpenAI, Google Maps, Firebase, and AWS. On the mobile side, I develop cross-platform applications using React Native (CLI & Expo) for IOS and Android, integrating cloud services like Firebase, Supabase, and AWS, and delivering smooth, production-ready user experiences. I also have strong experience in cloud and DevOps, deploying and maintaining applications with AWS, Docker, CI/CD pipelines, and platforms like Vercel and Firebase - ensuring reliability, scalability, and smooth delivery processes. I enjoy owning the full development lifecycle - from architecture and planning to deployment and optimization. As a developer, I’m detail-oriented and thoughtful in my approach. I prefer well-structured, scalable solutions over quick fixes, and I’m comfortable diving deep into complex problems to find the best possible outcome. I value clear communication, responsibility, and consistent progress in both team environments and independent work.

Available to hire

Full-Stack Developer with 5+ years of experience building and scaling web & mobile products. I’ve delivered 10+ production-ready applications, including cross-platform mobile apps, improved performance by up to 40%, and reduced load times 2–3x through smart architecture and optimization. Currently open to new opportunities.

From idea to launch - I design systems, build features, and ship reliable products across web and mobile that actually work in real-world environments

I work across the full stack using React / Next.js - building fast, user-focused interfaces with JavaScript / TypeScript and scalable backends with Node.js (NestJS, Express). I’ve designed and implemented APIs handling thousands of requests daily, working with PostgreSQL, MySQL, MongoDB, and Redis, and integrating services like Stripe, OpenAI, Google Maps, Firebase, and AWS.

On the mobile side, I develop cross-platform applications using React Native (CLI & Expo) for IOS and Android, integrating cloud services like Firebase, Supabase, and AWS, and delivering smooth, production-ready user experiences.

I also have strong experience in cloud and DevOps, deploying and maintaining applications with AWS, Docker, CI/CD pipelines, and platforms like Vercel and Firebase - ensuring reliability, scalability, and smooth delivery processes.

I enjoy owning the full development lifecycle - from architecture and planning to deployment and optimization.

As a developer, I’m detail-oriented and thoughtful in my approach. I prefer well-structured, scalable solutions over quick fixes, and I’m comfortable diving deep into complex problems to find the best possible outcome. I value clear communication, responsibility, and consistent progress in both team environments and independent work.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
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Language

English
Advanced
Ukrainian
Fluent
Russian
Advanced

Work Experience

Senior Full-Stack Developer at Galaktica
January 1, 2023 - January 1, 2026
Led full-stack development for SaaS and AI-powered products across web and mobile apps. Built RESTful and GraphQL APIs using Node.js and PostgreSQL; frontend implemented in React/Next.js, with performance optimizations (code-splitting, Redux Toolkit, Tailwind). Delivered 5+ production features across 2+ enterprise web apps, built data visualization dashboards and admin panels, and integrated OpenAI API for content generation. Implemented Stripe payments and deployed on AWS/Vercel using Docker-based CI/CD, achieving ~99.5% uptime over 18 months. Also led Pillowtalk, a cross-platform mobile journaling app, with React Native/Expo, real-time speech-to-text, AI-powered conversations, mood tracking, push notifications, and App Store/Google Play deployment.

Education

Master’s Degree - Computer Engineering at Ivan Franko National University of Lviv
September 1, 2023 - July 1, 2025
Bachelor’s Degree - Computer Engineering at Ivan Franko National University of Lviv
September 1, 2019 - July 1, 2023

Qualifications

Meta React Native Developer
June 1, 2024 - June 5, 2026

Industry Experience

Software & Internet, Professional Services, Retail, Financial Services, Other