Олександр

Alex Kadai
Kyiv, Ukraine [відкрити контакти](див. вище в блоці «контактна інформація») https://alexkadai.vercel.app
[відкрити контакти](див. вище в блоці «контактна інформація») github.com/alexandrkadai [відкрити контакти](див. вище в блоці «контактна інформація»)

FRONT END DEVELOPER
Frontend Developer with strong expertise in React.js, Next.js, and TypeScript, specializing in building
scalable, high-performance, and responsive web applications. Experienced in developing e-commerce
platforms, SaaS solutions, fintech integrations, and cross-platform mobile applications using modern
frontend and full-stack technologies.
Proficient in component-based architecture, state management (Redux, Zustand), RESTful APIs,
WebSockets, SSR/SSG, and performance optimization. Hands-on experience integrating backend services
(Node.js, Deno.js), PostgreSQL databases, Supabase, authentication systems, payment gateways (Stripe),
and real-time features.
Strong understanding of clean code principles, software architecture, security best practices (RLS policies),
CI/CD workflows, Git version control, and Agile methodologies. Passionate about writing maintainable,
testable code and continuously improving through algorithmic problem-solving and modern engineering
practices.

TECHNICAL SKILLS
Frontend Development:
React.js, Next.js, React Native, React Router, TypeScript, JavaScript (ES6+), HTML5, CSS3, SASS
State Management & Data Fetching:
Redux (Saga, Thunk), Redux Toolkit, Zustand, TanStack Query
Backend & APIs:
Node.js, Deno.js, REST APIs, WebSockets, SMTP
Databases & Backend Services:
PostgreSQL, Supabase, Prisma, Redis
Authentication & Integrations:
Clerk, Resend
Styling & UI / Animation:
Tailwind CSS, Framer Motion, GSAP, Three.js, PUG
DevOps & Tools:
Docker, CI/CD, Git
Computer Science Fundamentals:
Data Structures, Algorithms

SOFT SKILLS
Strong communication and interpersonal skills
Creativity and solution-oriented thinking
Advanced problem-solving abilities
Goal-oriented mindset with strong execution focus
Resilience and persistence in challenging situations
Team collaboration and active listening
Proactive contribution to team success
Reliable and committed professional
Ability to remain supportive and effective in high-pressure situations
PROFESSIONAL EXPERIENCE
Gerko - South Africa Sep 2025 - Present
Front End Developer

Achievements:
Improved overall application performance by 40% through frontend optimization, efficient state
management, and backend query refinement.
Architected and integrated secure backend services using PostgreSQL, Supabase Edge Functions, and
RLS policies, strengthening data protection and access control.
Designed and deployed an automated customer support chatbot, reducing manual support workload by
30%.
Implemented PDF generation, email, and SMS notification systems, increasing operational automation by
35%.
Refactored legacy modules, improving maintainability and reducing technical debt by 25%.
Contributed to structured Git workflows, pull request reviews, and issue management to enhance
development efficiency.

Key Tasks & Responsibilities:
Fixed bugs and implemented new features based on project requirements.
Created and managed GitHub issues, pull requests, and code reviews.
Worked with PostgreSQL: managing tables, writing queries, and implementing RLS policies.
Developed and maintained database Edge Functions for backend logic.
Enhanced and redesigned layouts to improve usability and visual consistency.
Built and optimised server-side logic using Node.js and Deno.js.
Implemented functionality for PDF generation, email, and SMS sending.
Created and maintained chatbot functionality for customer support.

Technologies:

React.js, Typescript, React-Router, Node.js, Deno.js, WebSockets, Tailwind, Shadcn, Tanstack Query, Zod,
Supabase, PostgreSQL, Telegram Api.

Solvd - USA Jan 2025 - June 2025
Front End Developer
Applied advanced frontend architecture and scalable application patterns.
Delivered multiple production-level assignments in a collaborative Git-based workflow, improving code
quality through structured peer reviews.
Increased task delivery efficiency by 20% by applying best practices in component design and state
management.
Successfully passed three technical evaluation stages demonstrating strong proficiency in React and
modern JavaScript.

Technologies:

React.js, Next.js, Node.js, Javascript, Es6+, React-Router, Redux, TypeScript, Mui, Tailwind, Shadcn,
Html5, Css3, Styled Components.
NewsFeed March 2024 - January 2025
Front End Developer / React Native Expo Developer

Developed secure application architecture with protected routing and authentication flows using React
and TypeScript.
Integrated Stripe payment system ensuring reliable and secure transaction handling.
Enhanced large dataset rendering performance by 45% through query optimization and efficient state
updates.
Engineered advanced filtering and search mechanisms, significantly improving data discoverability.
Built complex mobile interfaces with React Native and Expo, ensuring smooth cross-platform
performance.

Technologies:
React Native, Expo, Native Navigation, Reanimated, TypeScript, Solr, Stripe, Node.js, React, React-Router,
Redux, TypeScript, Tailwind, Shadcn

Rowdy.is October 2023 - February 2024
Frontend Developer

Led end-to-end development of an e-commerce platform from concept to deployment.
Increased user engagement by 30% by implementing dynamic UI components and interactive
animations.
Integrated Nova Poshta shipping API, streamlining checkout and delivery workflows.

Technologies:

React, React Router, HTML5, CSS3, SASS, Redux-toolkit, i18n, Tailwind, TypeScript, REST API

Grillbar.com.ua March 2023 - August 2023
Web Developer

Redesigned and developed user-friendly menu cards for a restaurant, enhancing readability and visual
appeal for customers.
Created dedicated pages for multiple locations, ensuring tailored content and improved user experience
across different branches.
Improved and optimized website sections to streamline navigation and provide a more cohesive and
engaging interface.

Technologies:

HTML, CSS, JavaScript, SASS, PHP, Hostinger, Email.js

HelpUkraineFoundation.org September 2022 - March 2023
Frontend Developer

Built responsive layouts and improved navigation flow to enhance overall user experience.
Implemented Stripe.js payment processing, enabling secure and seamless donations.
Integrated multilingual support (i18n), expanding accessibility for international users.
Developed dynamic news modules to ensure real-time content updates.

Technologies:

React, Redux-toolkit, i18n, Tailwind, TypeScript, Stripe
EDUCATION

Polsko-Japonska Akademia Nauk Komputerowych Warszaw, Poland 2015-2018
Web Communication and Information Systems
Relevant focus: Web Technologies, Information Systems Architecture, Human-Computer Interaction (HCI),
Digital Communication Systems

International University of Finance Kiev, Ukraine 2010-2014
Bachelor of Management and Administration
Relevant focus: Business Management, Organizational Strategy, Analytical Thinking, Project Coordination

PROFESSIONAL DEVELOPMENT & COURSES

Complete React Developer (w/ Redux, Hooks, GraphQL)
Udemy Advanced training in React.js ecosystem including state
management, modern hooks architecture, performance optimization,
and scalable frontend application design
Udemy Certificate of Completion.

Complete course on JavaScript + React - from scratch to results
JavaScript + React – From Fundamentals to Advanced Applications –
Udemy
Comprehensive course covering JavaScript (ES6+), asynchronous
programming, component-based architecture, and production-ready
React development.
Udemy Certificate of Completion

LANGUAGES

English – Upper-Intermediate (B2)
Polish – Upper-Intermediate (B2)
Ukrainian – Native
Russian – Native
Spanish – Beginner (A1)