Frontend Engineer Job Simulation
HireGrid's candidate board broke in production and its four candidate tables have drifted apart. You get both tickets a frontend engineer actually gets in week one: find why the board misbehaves, then design the component that replaces the copies.
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Alex WhitfieldFrontend Lead, HireGrid
Welcome to HireGrid. I'm Alex, Frontend Lead here. We build the applicant tracking tool recruiters live in all day, and you're joining right after a rough release - so you get the interesting work immediately. Two tickets: find out why our candidate board broke in production, then design the table component four of our screens should have shared from the start. I care less about perfect code than about whether you can explain what you found and defend a decision. Read carefully, then tell me what you think.
Your manager for this simulation. Reviews feel this real too.
Why finish this simulation
A risk-free way to experience the frontend job before you're hired - debug real production React, defend a component API in review, and back your applications with evidence instead of adjectives.
Evidence, not a certificate. Your answers map onto the Frontend Engineer competencies in your Talent Graph - CSS, rendering model, accessibility and performance - so employers see what you actually demonstrated.
The week-one work, not a puzzle. Reading unfamiliar React and explaining why it misbehaves is the real first month of a frontend job. Nobody hands a fresher a greenfield app.
Accessibility as an engineering skill. An accessible name and an announced sort are decisions, not a checklist item bolted on later. Most fresher portfolios never show this.
Performance you can reason about. Layout shift and needless re-renders are the two frontend costs teams actually measure. You will be able to name both and their causes.
A design you have to defend. FE-102 is a review, not a quiz. You state a component API and argue for it - the exact conversation of a frontend interview loop.
Feedback that names the gap. Every submission returns per-question results and a rubric read of your notes, so a retry is targeted rather than a guess.
How it works
01Pick up a ticket
Real tasks land on your board like a Jira queue. Download the dataset and work in your tool of choice.
02Submit for review
Your work enters review - results within 24 hours (usually much sooner). The clock pauses while you wait, like a real take-home.
03Pass, then progress
Pass to unlock the next ticket. Clear every ticket to earn a certificate and a spot on the weekly leaderboard.
Skills you will learn and practice
- Debugging React re-render loops from referential identity
- Why list keys must be stable identity, not array position
- CSS grid and flex automatic minimum size (min-width: auto)
- Diagnosing Cumulative Layout Shift from unsized media
- Accessible names for icon-only controls
- Designing a candidate-agnostic component API
- Announced sorting with aria-sort
- Virtualisation and debounce placement at 10k rows
The tickets
What you'll learn
- Why a grid child with overflow scrolls the page instead of itself
- How React reuses DOM by key, and what array indices do to component state
- Why React.memo silently does nothing when a prop is rebuilt every render
What you'll do
- Read a real ~130-line React + CSS board and locate five distinct defects
- Answer five questions checked against the code's actual behaviour
- Write the fix note your lead reads before approving the PR
Weekly leaderboard
Highest ranking points top the board - your score counts 80%, your speed 20%.
Your Future Certificate
Preview only. Clear both tickets to earn your personalized certificate - free.
Verified Certificate
Unique verification URL & QR code
LinkedIn Integration
Add to your profile with one click
Performance Analysis
Detailed insights into your results
Issued by DPIIT-recognized & MSME-registered company
Clear it, prove it
Pass both tickets and your verifiable certificate is free - add it to LinkedIn right away. Want to go deeper? Generate a personalized AI review of your performance for a one-time ₹99.