What we test for
Typical work
- Features across whichever framework the code base already uses
- Code that has to run in the browser and on the server without two copies
- Shared libraries and tooling that several teams depend on
- Performance and bundle work the framework will not do for you
The coding test
Make a slow page fast without rewriting it: a real profile first, then the bundle, the main thread, and whatever loads that nobody ever sees. After that, fix a bug that only appears when two requests come back out of order. Scored on measuring before changing, and on how little they change.
Inside JavaScript
The ones people search for by name get a page of their own, with their own coding test and interview questions.
React
Frontend engineers who ship the UI your roadmap promised.
See the page →Angular
Large typed front ends, RxJS, and upgrades from old Angular versions.
See the page →Vue.js
Vue 3 and Nuxt product UI, Pinia, and migrations off the Options API.
See the page →TypeScript
Types that make a refactor safe, migrations off JavaScript, and contracts that hold.
See the page →Five interview questions you can reuse
We use questions like these in our soft-skills and technical rounds. Steal them for your own interviews.
Modules still collide in real projects. Where does it hurt?
A strong answer covers: A package published both ways and resolved twice, so two copies of the same class never match. __dirname and require missing on the modern side. Export maps pointing somewhere the bundler agrees with and the test runner does not. The way out is to pick one at the edge of your own code rather than keep both alive.
Where does JavaScript quietly get numbers and dates wrong?
A strong answer covers: Floats for money, which wants integers of the smallest unit or a decimal library. JSON turning a 64-bit identifier into something approximate, which is why ids travel as strings. And a date with no time zone of its own, so the browser, the server and the database each assume a different one. Store in UTC, format at the edge.
A page takes four seconds to become interactive. What do you look at?
A strong answer covers: A real profile before any guess: what is in the main bundle, what blocks the main thread, what loads that nobody sees. Then code splitting, deferring, and the images and fonts, which usually beat anything the framework can give you.
What goes wrong with async code in JavaScript?
A strong answer covers: Floating promises nobody awaits, errors swallowed because nothing catches, sequential awaits where one Promise.all would do, and race conditions from state written after the component or the request is gone.
How do you choose between a dependency and writing it yourself?
A strong answer covers: Weigh what it costs to own against what it costs to depend: size, maintenance, how hard it is to replace, and whether you would understand it the night it breaks. Date and utility helpers are usually worth the thirty lines.
One monthly price per developer. Everything in it.
No deposit, no minimum term, no placement fee. You pay one invoice a month for each developer on your team.
Per developer, all-in. Your quote arrives by email with your exact number after you send the brief.
- Developer pay, local payroll and taxes
- Vetting: coding test, soft skills, English
- Free replacement within 90 days
- A direct line to our CEO
What changes the price
- Seniority and role. Senior engineer, tech lead or architect.
- Stack. Some stacks and niche tools cost more to staff.
- Team size. Larger teams get a better monthly rate per seat.
- White-label. Agencies reselling under their brand get partner pricing.
Terms in plain words
- First 2 weeks risk-free: if it isn't working, you don't pay for them
- Month to month, 30 days' notice to end
- No deposit and no minimum number of seats
- Want to hire the developer full-time? Buyout of 3 months' fee in year one, 2 months' after
Questions tech leads ask us
How senior are your JavaScript developers?
6+ years of professional JavaScript work, with recent production experience.
Can I see the coding test results?
Yes. Every profile card includes the score and the reviewer's notes.
What does it cost?
$6,900 per developer per month, all-in, and flat: the same rate whatever the stack. Your exact quote arrives by email after you send the brief.
Skip the sales rep. Talk to the CEO.
Tell us what you're building, your stack and when you need people. Three matched profiles within 48 hours, and a straight answer on whether we're the right fit.