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Yehor Kozlianskyi

Contacts

About Me

I’m a frontend developer with a strong hands-on background and a deep theoretical foundation. Proficient in HTML, CSS, SCSS, and modern responsive web development. Experienced in adaptive, cross-browser, semantic, and pixel-perfect layout with advanced animations.

I possess solid JavaScript knowledge — I’ve solved and analyzed a wide range of problems, including multiple implementations and performance measurements. Confident working with React and TypeScript, implementing routing, and managing state with Redux and RTK Query.

I enjoy exploring language internals, and writing clean, efficient, and maintainable code.

Skills

HTML / CSS / SCSS

Semantic and responsive layout
Cross-browser compatibility
BEM methodology
CSS and JavaScript animations
Pixel-perfect implementation

JavaScript

Advanced knowledge (closures, scopes, async/await, execution context, etc.)
Solution optimization (complexity analysis, performance benchmarking)
In-depth understanding of the DOM, event model, and rendering process

React + TypeScript

Functional components, hooks, context
Strong typing in components, props, and state
React Router for client-side routing
Redux and Redux Toolkit for state management
RTK Query for efficient API interaction

Problem-Solving Approach

Explore multiple solutions from basic to optimal
Analyze time/space complexity and profile code performance
Use JavaScript with deep understanding, not just intuition
Write clean, readable, and reusable code with maintainability in mind

Code Example

function sortArray(arr) {
    const filteredOdd = arr.filter(el => el % 2).sort((a, b) => a - b);
    let result = [...arr];
    for (let i = 0, x = 0; i < result.length; i++) {
        if (result[i] % 2) {
            result[i] = filteredOdd[x];
            x++;
        }
    }
    return result;
}

Languages

Russian — Native
Ukrainian — Native
English — B1