Олександр

Oleksandr Portianko
Frontend Software Engineer | React, Next.js, TypeScript
[open contact info](look above in the "contact info" section) [open contact info](look above in the "contact info" section) Lutsk, Ukraine

[open contact info](look above in the "contact info" section) github.com/oleksandrportianko

Summary
Frontend Software Engineer with 4+ years of commercial experience specializing in React, Next.js, TypeScript and
modern web application development. Contributed to and delivered 20+ projects across SaaS, mobile
applications, e-commerce, logistics, AI tools and data visualization. Experienced in building complex user
interfaces, dashboards, editors, payment and subscription flows, AI-powered features, and third-party
integrations. Also worked as a Tech Lead, taking ownership of frontend architecture, technical decisions, code
reviews, development coordination and production releases.

Professional Experience
Technical Lead, SP-Lutsk 01/2026 – 06/2026
•Coordinated development work, technical decisions, code reviews and release Lutsk, Ukraine
planning.
•Communicated with stakeholders and helped define implementation priorities.
•Oversaw features from planning and architecture to deployment and production
release.
•Continued hands-on development across frontend and full-stack product features.

Full-Stack Developer, SP-Lutsk 01/2025 – 01/2026
•Developed frontend and full-stack features for production SaaS products using React, Lutsk, Ukraine
Next.js,and TypeScript.
•Built complex user interfaces, business workflows, dashboards and backend API
integrations.
•Developed AI-powered features and integrated payment, analytics, authentication and
third-party services.
•Improved application performance, stability, scalability and user experience.

Frontend Developer, SP-Lutsk 12/2021 – 01/2025
•Developed production web applications and reusable interfaces with React, Next.js, Lutsk, Ukraine
JavaScript and TypeScript.
•Built dashboards, forms, editors, tables, data visualizations and responsive user flows.
•Integrated REST APIs, authentication, payments, analytics and cloud services.
•Improved frontend performance, usability, responsiveness and cross-browser
compatibility.

Education
Master’s Degree in Computer Engineering, Lutsk National Technical University 09/2022 – 12/2023
Lutsk, Ukraine

Bachelor’s Degree in Computer Engineering, Lutsk National Technical University 09/2018 – 06/2022
Lutsk, Ukraine

Skills
React, Next.js, TypeScript, JavaScript REST APIs & Third-Party Integrations
HTML5, CSS3, Tailwind CSS Authentication & Authorization
Redux Toolkit, RTK Query Payment & Subscription Integrations
Responsive Web Development AI & LLM Integrations
Frontend Architecture React Native, Expo

Performance Optimization Technical Leadership
Code Review Team & Stakeholder Communication

Languages
Ukrainian English
Native Upper-Intermediate (B2)

Projects
CoinZecca , AI-Powered Coin Identification Mobile App 05/2026 – 06/2026
Improved and production-hardened an AI-powered React Native application for coin
identification. Worked on subscription and trial flows, analytics, attribution, consent,
production monitoring and iOS/Android release management.

JustHeadshots , AI Headshot Generation Platform 05/2024 – 06/2026
Developed an AI-powered platform for generating professional headshots from user-
uploaded images. Built image upload and customization workflows, integrated AI
generation services, improved reliability and usability across the generation process.

QRCodeveloper , Dynamic QR Code SaaS Platform 05/2023 – 06/2026
Developed and maintained a SaaS platform for creating and managing dynamic QR
codes. Built complex editors, file-based QR workflows, analytics, scan tracking, and
third-party integrations. Contributed to a product serving 800,000+ users and
processing over 6 million scans.

CloudOrder , E-commerce and Order Management SaaS 01/2022 – 06/2026
Developed and maintained a cloud-based platform for order, inventory, customer and
fulfillment management. Built complex React interfaces, backend integrations, real-time
notifications and operational dashboards that helped automate business workflows.