Олександр

Oleksandr Portianko
Frontend Software Engineer | React, Next.js, TypeScript
[відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація») Lutsk, Ukraine

[відкрити контакти](див. вище в блоці «контактна інформація») github.com/oleksandrportianko

Summary
Frontend Software Engineer with 4+ years of commercial experience building and maintaining production web
and mobile applications with React, Next.js, TypeScript and React Native. Delivered frontend and full-stack
features across 20+ commercial projects in SaaS, e-commerce, logistics, mobile applications, AI-powered
products and data visualization.
Experienced in building complex dashboards, editors, business workflows, responsive interfaces and data-
driven applications, integrating REST APIs, authentication, payments, analytics and third-party services.
Contributed to products serving 800K+ users.
Also worked as a Technical Lead, owning frontend architecture and technical decisions, coordinating
development, reviewing code and supporting production releases. Experienced with integrating AI/LLM services
into production applications and delivering features from implementation through deployment.

Professional Experience
Technical Lead – Frontend / Full-Stack, SP-Lutsk 01/2026 – 06/2026
•Led development work across production web products, coordinating technical Lutsk, Ukraine
decisions, code reviews, implementation priorities and release planning.
•Owned features from technical planning and frontend architecture through
implementation, deployment and production release.
•Communicated with stakeholders to clarify requirements, define implementation
priorities and coordinate delivery.
•Continued hands-on development of frontend and full-stack product features using
React, Next.js and TypeScript.
•Supported production stability, performance and maintainability across active
products.

Full-Stack Developer – Frontend-focused, SP-Lutsk 01/2025 – 01/2026
•Developed and maintained production SaaS applications using React, Next.js and Lutsk, Ukraine
TypeScript, with a strong focus on frontend development.
•Built complex dashboards, business workflows, editors, forms and data-driven
interfaces backed by REST APIs.
•Implemented integrations with authentication, payment, analytics and third-party
services.
•Developed AI-powered product features and integrated external AI/LLM services into
production workflows.
•Improved application performance, stability, responsiveness and user experience
across production products.

Frontend Developer, SP-Lutsk 12/2021 – 01/2025
•Developed production web applications and reusable interfaces using React, Next.js, Lutsk, Ukraine
TypeScript and JavaScript.
•Built complex dashboards, forms, editors, tables, data visualizations and
responsive user flows.
•Integrated REST APIs, authentication, payments, analytics and cloud services into
frontend applications.
•Worked on production SaaS and e-commerce products, implementing business
workflows and third-party integrations.
•Improved frontend performance, usability, responsiveness and cross-browser
compatibility.
•Contributed to products including SaaS platforms, e-commerce/order-management
systems, AI applications and data-driven tools.

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 and user consent.
•

Supported 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 and integrated AI generation
services.
•Improved reliability and usability across the image-generation workflow.

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 React interfaces, editors, file-based workflows, analytics and scan-
•

tracking functionality.
Integrated third-party services and contributed to production application reliability
•

and usability.
Contributed to a product serving 800,000+ users and processing 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, operational dashboards and business workflows.
•Integrated frontend functionality with backend APIs and third-party services.
•Implemented real-time notifications and interfaces supporting logistics and order-
management workflows.

Skills
Frontend: React, Next.js, TypeScript, JavaScript, State & Data: Redux Toolkit, RTK Query, REST APIs,
React Native, Expo, HTML5, CSS3, Tailwind CSS API Integrations
Frontend Engineering: Frontend Architecture, Testing & Quality: Code Review, Production
Responsive Web Development, Performance Monitoring
Optimization, Reusable UI Components, Cross-
AI: AI & LLM Integrations, AI-powered Product
Browser Compatibility
Features
Integrations: Authentication & Authorization,
Payment & Subscription Integrations, Analytics,
Third-Party Services
Leadership: Technical Leadership, Development
Coordination, Stakeholder Communication

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

Languages
Ukrainian English
Native Upper-Intermediate (B2)