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Alex Kaminskiy

@alexkaminskiy

Message

Frontend engineer building high-performance React/Next.js products with accessibility, speed, and API-driven UX.

Ireland

Message

What I'm looking for

I want to build React/Next.js products where performance (Core Web Vitals), API-driven UX, and WCAG accessibility are priorities. I enjoy Agile sprints, code reviews, and cross-functional collaboration to deliver measurable speed and SEO improvements.

I’m a Frontend Engineer with 5 years of commercial experience delivering web applications for EU/US clients, focused on React 18, TypeScript, and Next.js. I build with strong JavaScript engineering, REST API integration, and performance optimisation tied to Core Web Vitals.

In my current role, I architect and develop Rentola, a full-stack car rental application using Next.js 15 (App Router), Prisma ORM, PostgreSQL, Auth.js v5, and Tailwind CSS. I’ve implemented Server Actions for data mutations, role-based middleware for route protection, and server/client component architecture for type-safe access and maintainable UI.

Previously, I improved Core Web Vitals scores by up to 35% across client sites through image optimisation, code splitting, lazy loading, and caching, while keeping WCAG accessibility in mind. I work confidently in Agile/Scrum with code reviews and cross-functional collaboration, consistently shipping responsive, production-ready experiences.

Experience

Work history, roles, and key accomplishments

Current

Frontend Engineer (Independent)

Current

Independent

Jan 2026 - Present (5 months)

Architected and developed Rentola, a full-stack car rental application using Next.js (App Router) with TypeScript strict mode. Implemented role-based authentication (USER/ADMIN), server actions for mutations, route protection middleware, and type-safe data access with Prisma ORM and PostgreSQL.

TypeScript React Prisma PostgreSQL Server Actions

Frontend Developer

Next Level Solutions

Nov 2021 - Jan 2026 (4 years 2 months)

Developed responsive, component-based interfaces for 15+ client projects, integrating third-party services via REST APIs. Improved Core Web Vitals by up to 35% and built a reusable UI component library, reducing frontend development time for new features by ~20%.

Javascript (ES6)Responsive Design REST APIs Code Splitting Lazy Loading Caching Strategies UI Components WCAG Accessibility

Web Developer (Independent)

Independent

Jan 2020 - May 2021 (1 year 4 months)

Delivered landing pages and business websites, managing the full lifecycle from requirements gathering to deployment. Implemented responsive design, on-page SEO, SSL configuration, and performance optimization to achieve consistent 90+ PageSpeed scores.

HTML5 JavaScript Responsive Design On Page SEO Performance Optimization CMS Integration

Education

Degrees, certifications, and relevant coursework

Zhytomyr Polytechnic State University

Bachelor of Software Engineering, Software Engineering

Part-time Bachelor's Degree in Software Engineering focusing on algorithms and data structures, web development, databases, computer networks, software engineering practices, and cybersecurity.