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Tekion UI developer Interview Experience

UI developer

Tekion
September 25, 2026
16 Questions
Not Selected

Summary

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The interview process at Tekion consisted of two main rounds focusing on frontend fundamentals and high-level design (HLD). Candidates faced a variety of questions covering topics from JavaScript execution to React component lifecycle, as well as design considerations for a scalable UI system. Overall, the difficulty level of the interview was medium, with a mix of theoretical and practical applications, reflecting Tekion's emphasis on strong frontend expertise.

1

Pure Frontend fundamentals

#1

JavaScript Execution Context and Event Loop

Explain how the JavaScript execution context works, including async behavior and the event loop.
Medium
#2

JavaScript Closures and Promises

What are closures? Also, explain Promises and their use in async logic. Include questions on hoisting, string methods, and array methods.
Medium
#3

Top-K Elements Problem

How would you find the top-k elements in an array? Explain the hash map problem related to this.
DSA
Medium
#4

Arrow Functions vs Normal Functions

What is the difference between arrow functions and normal functions in JavaScript?
Easy
#5

Rebuilding Common Patterns with React

Build a React list with a collapse/expand feature and create a reusable Button component with variants and sizes (similar to MUI).
React
Medium
#6

React Lifecycle and Hooks

Explain the lifecycle of React class components and the behavior of hooks.
React
Medium
#7

React Reconciliation

What is reconciliation in React? How does rendering work and why does React behave a certain way?
React
Medium
#8

Browser Reflow and Repaint

Define reflow and repaint in the browser. When do they occur?
Medium
#9

CSS Animation Performance

Why is transform preferred for CSS animations in terms of performance?
Medium
#10

Event Propagation

Explain event propagation, including the concepts of bubbling and capturing.
Easy
#11

Promise Polyfill

Write a Promise polyfill and provide real use cases where it might be applied.
Hard
#12

Async Scheduler

Implement an async scheduler with a maximum concurrency limit.
Hard
#13

Big List Rendering Optimization

How would you optimize rendering of a big list using windowing or virtualization techniques?
Medium
#14

Building React-like Class Components

How would you build React-like class components from scratch using ES5?
Hard
2

HLD

#1

Design a Grid UI System

Design a Pinterest-like grid UI system. Discuss the architecture and performance, covering how components break down, data flow, and handling large datasets efficiently.
Medium
#2

Discuss HLD of a Frontend System

Discuss the high-level design of your current or past frontend system or project, including modules, component hierarchy, API contracts, caching, performance, and non-functional requirements such as response time and availability.
Medium
ReactJavaScriptDSAHLDFrontend Fundamentals
A

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