Hire JavaScript developers by skill
To hire a JavaScript developer, check how they handle async code, the browser and APIs on a real task, then talk through their own solution. DeveloperHiring does the sourcing, testing and AI interview, and gives you a ranked top five. You keep the hire and pay a flat subscription, not an agency fee.
Edit the role, then see the skill matrix, screening questions and a sample coding task in about a minute.
#1 Candidate 6368
JavaScript, Node.js, Express · code, interview and integrity done
#2 Candidate 7522
JavaScript, Node.js, Express · code, interview and integrity done
#3 Candidate 5344
JavaScript, Node.js, Express · code, interview and integrity done
#4 Candidate 8583
JavaScript, Node.js, Express · code, interview and integrity done
#5 Candidate 4286
JavaScript, Node.js, Express · code, interview and integrity done
What does a JavaScript developer do?
JavaScript runs in the browser, on servers and in build tools. A JavaScript role can mean frontend features, Node.js services or both. We help you pick the task that fits your real work.
Which JavaScript skills do we test?
The skill matrix for a JavaScript role starts with these six areas. You can change the weights in the role builder.
Async code
Promises, async and await, error handling and cancelling work that is no longer needed.
The browser
The DOM, events, fetch and storage, without relying on a framework for everything.
Modern syntax
Modules, destructuring and array methods used for clarity, not cleverness.
APIs
Calling and shaping JSON APIs, retries and timeouts.
Debugging
Reading stack traces and using browser dev tools to find the real cause.
Testing
Unit tests for logic and a few tests for the critical user paths.
Which screening questions work for JavaScript roles?
Screening questions go out by email right after a candidate enters the pipeline. Answers are scored against the skill matrix, with a written reason. Here are three from the JavaScript library.
- Q1 Explain a bug you fixed that came from async timing. How did you find it?
- Q2 How would you cancel a slow request when the user types a new search term?
- Q3 What do you check before adding a new npm dependency?
What does the JavaScript coding task look like?
Resilient API client. Write a small client that calls a flaky API, retries with backoff, cancels stale requests and caches results. Time limit 60 minutes.
- Wrap fetch with timeouts and retries
- Cancel older requests with AbortController
- Cache successful responses for 60 seconds
- Test the retry and cancel behavior
export async function getJson(url, { signal, retries = 3 } = {}) {
for (let i = 0; i <= retries; i++) {
try { return await fetchWithTimeout(url, { signal }) }
catch (e) { if (i === retries || signal?.aborted) throw e; await sleep(2 ** i * 200) }
}
}Running hidden tests
passed 9 of 11
failed aborts_stale_request, caches_for_60_secondsHow do you tell a junior from a senior JavaScript developer?
The test and the AI interview look for different signals at each level. Use these to set the seniority in the role builder.
| Level | What you should see |
|---|---|
| Junior | Writes working async code, may miss edge cases like cancellation. |
| Mid | Handles errors, retries and timeouts on purpose, writes tests for them. |
| Senior | Designs clean module boundaries and explains why each dependency is worth it. |
How much does a JavaScript developer cost?
Pay varies a lot by country, city, seniority and company. Public salary surveys show broad yearly ranges like these for mid-level to senior JavaScript developers. Treat them as a starting point and check current surveys for your market.
Pure JavaScript roles often pay a little less than roles that add TypeScript, React or Node.js depth.
| Region | Typical range |
|---|---|
| United States | about 80,000 to 140,000 USD |
| Western Europe | about 40,000 to 75,000 EUR |
| Latin America and Eastern Europe, remote | about 25,000 to 60,000 USD |
| India | about 8,000 to 30,000 USD |
Blind review on
Name and photo hidden until shortlist
91
overall
Code
93
Interview
89
Integrity
Clean
How does the JavaScript shortlist work?
Many JavaScript developers publish small libraries, browser extensions or open source fixes. Public commits show how they write and review code. Every candidate then goes through the same screen, the JavaScript task and an AI interview about their own solution. Integrity signals show paste events, similarity and AI code likelihood.
The top five land on your shortlist with a scorecard each. Your team meets them and makes the offer. You keep the hire and pay a flat subscription, from $99 per month billed yearly, not an agency fee.
Learn more about the coding assessment, the technical interview and pricing.
Questions about hiring JavaScript developers
Related stacks
Get five verified JavaScript developers for your role
Paste a role description and get a skill matrix, screening questions and a sample coding task. Plans start at $99 per month billed yearly, with no placement fees.