For logic that still has to be right when no framework is watching
Hire JavaScript Developers
Most JavaScript work has quietly become framework work. A candidate who only knows React's or Vue's conventions can still misunderstand what the language underneath is doing. These engineers are tested on the language itself, then placed wherever your stack needs someone who understands JavaScript before a framework steps in to help.
- Profiles typically within two business days
- Replacement Assurance: If an engineer is not the right fit, a replacement from our own team starts within ten business days of your request, at no extra cost
- You interview before placement if you want to
- At least four hours a day inside your core working hours. Two hours plus a daily written handover for the US West Coast
- 14-Day Risk-Free Trial: For your first engineer on a time-and-materials engagement. Up to 14 calendar days or 80 logged working hours, whichever comes first. End within the trial and pay nothing for trial hours. Continue beyond it and those hours are billed at the agreed rate. Unpaid trial work remains ours if you stop
How we evaluate a JavaScript engineer
The tasks, the signals and the onboarding, walked through by the people who run them.
90 secSample frame · video pending01Published, not promised
The assessment behind every engineer we send.
The JavaScript bar is published rather than assumed: five competencies, the exact task behind each, and what a failing answer sounds like. Most vendors test framework trivia. We test the language itself.
What we listen forWhether they understand what a closure actually captures, not just that the word exists.
A loop that creates five buttons makes all of them alert the number five when clicked, no matter which one is pressed. Explain why, and fix it two different ways.
- What strong sounds like
- Explains the shared variable binding precisely and offers both a scoping fix and a closure-capturing fix, understanding the tradeoff.
- What gives us pause
- Reaches for a library or framework feature to work around the problem without explaining why the bug happens.
JavaScript (ES2023) · TypeScript · Web APIs · WebAssembly basics
Node.js · Deno · Browser engines · Service Workers
Jest · Mocha · Playwright
Webpack · Vite · ESLint · npm/pnpm
02Who you actually meet
The bench, priced by seniority.
Three seniority tiers, priced honestly, and the engineers who fill each one today. Real names and photos take their place as soon as we can share them, and the standard stays exactly the same.
Engineer
Features scoped tightly enough to ship inside your review bar, every time.
The right first hire when your seniors already set the standard.
$2,300–3,000per month
Senior
The hard module nobody else wants to own, taken end to end.
Ownership of a surface, without adding a manager to your headcount.
$3,300–4,200per month
Lead
The workstream's decisions, made daily, so nothing waits on a meeting.
One accountable voice for a pod or initiative that can't afford to drift.
$4,500–5,700per month
JavaScript engineer
3 yrs · US East overlap
Diagnosed a memory leak in a single-page app that had eluded two previous audits
- JavaScript
- Node.js
- Jest
Senior JavaScript engineer
7 yrs · UK + EU hours
Rebuilt a checkout flow's event handling after months of intermittently lost clicks
- JavaScript
- Webpack
- Playwright
- Web APIs
Lead JavaScript engineer
10 yrs · EU + US split
Owns the shared utility library three product teams build on daily
- TypeScript
- Node.js
- CI/CD
- Performance profiling
Indicative ranges, representative profiles. Exact figures and named engineers arrive with your shortlist.
Weighing this against a freelancer, a direct hire or a marketplace? See the honest comparison
03From stated problem to first change
Four steps, each closing on evidence.
Matching starts from language fundamentals, not a framework checklist. Each step below produces something you can inspect, and stopping after any of them costs you nothing.
Define the actual problem
We map what the code genuinely needs to do underneath whatever framework sits on top. The role brief names the problem, not a list of JavaScript buzzwords.
A brief your leads signMatch against your runtime
Candidates are screened against your actual runtime, build tooling and review culture. Three engineers who understand your stack beat thirty who list ES6 on a resume.
Three fits, not thirty CVsAssess on the real tasks
Your team can sit in on the closure and event-loop exercises directly. You see reasoning about the language itself, not a framework tutorial recited back.
Evaluation you can watchOnboard inside your process
Access, standards and a first bounded fix to real production code. Continuity cover means a departure is our scheduling problem, not a gap in your sprint.
A merged change in week one
04Evidence and proof
Engineers who understood the language, not just the framework.
JavaScript proof is a diagnosis that holds up without a framework to lean on. Every record here waits for written client approval before production.
Explore case studies
A checkout script that stopped losing clicks under real traffic.
Koru Health's vanilla-JS checkout widget dropped clicks intermittently under load with no framework in place to blame. An embedded JavaScript engineer traced it to an event-listener leak and fixed it inside a sprint.
- Dropped-click rate
- Eliminated
- Time to root cause
- Under one week
He diagnosed a closure bug live in the interview that our own team had been chasing for two weeks.
Sample · pending client approval
She explained the event loop to our juniors in a way that finally made their async bugs make sense.
Sample · pending client approval
05Three shapes, one standard
Add an engineer, a JavaScript pod, or a practice.
Most teams start with one engineer working inside an existing runtime and grow from there. Some need a pod that owns a slice of the platform outright. When delivery ownership is the honest need, we say so plainly.
- Team extension
One named engineer
A single JavaScript specialist inside your direction and your reviews. The smallest commitment, and the most common way teams start.
- Delivery pods
A JavaScript pod
A pod with its own lead that takes ownership of a runtime, build pipeline or shared library. You set priorities while the pod carries delivery.
- Custom software development
The practice, not the person
When what you need is software delivered rather than a seat filled, custom software development takes on that accountability instead.
06Straight answers
Asked before a JavaScript hire is signed.
01What does a JavaScript engineer actually do day to day?
Writes and debugs core application logic, reasons about asynchronous sequencing and the event loop, and keeps code correct at the language level regardless of which framework sits on top. The unglamorous majority of the work is code that still makes sense once a framework is stripped away.
02Do you hire JavaScript engineers who also know a specific framework?
Matched to your actual stack. The evaluation focuses on language fundamentals first, which transfer across any framework, then confirms depth in whichever one your codebase runs.
03Can we run our own interviews as well?
Yes, and the published tasks travel well into your own loops. Several clients reuse the closure and event-loop exercises directly for their own future hiring.
04How fast can a JavaScript engineer start?
A shortlist arrives in days because JavaScript matching draws from a bench evaluated continuously. Onboarding speed after that mostly tracks your own repository access process.
05Who manages the engineer day to day?
Your leads set direction, run the reviews and hold the standards. We carry continuity, payroll and replacement risk, which is the part a direct hire never covers.
06What if the engineer is not the right fit?
Flag it in the first weeks and the replacement is funded by us. The next match is briefed on exactly what missed, so it rarely takes a third attempt.
07Do your JavaScript developers use AI coding tools?
Yes, openly. AI drafts boilerplate and repetitive test cases quickly; the engineer stays accountable for every closure, async sequence and merge that reaches your codebase.
08How does pricing work for a hired JavaScript engineer?
The bands above set the honest range; the shortlist carries the exact figure per engineer. Monthly billing, no placement fee, and a notice period instead of a lock-in.