Profiles in ~48 hoursVetted shortlist after your brief
Start within a weekAfter a short interview or trial
You own the codeIP assignment and NDA
Scale with 30 days noticeAdd or release engineers
Trusted by founders and enterprises worldwide
About hiring JavaScript engineers
Everything to know before you hire JavaScript talent
Hire JavaScript developers who write TypeScript by default and understand the language underneath the frameworks. Speqto engineers work across browser and server, from interface logic to build tooling and APIs, supporting founders and engineering leads who want one pool of flexible talent for web products that keep changing.
Frameworks come and go, but teams that understand closures, the event loop, prototypes, modules and asynchronous control flow adapt to each new one in weeks. Developers who only know a framework's idioms struggle when the abstraction leaks, for example in memory leaks, race conditions or confusing rendering bugs. The ecosystem moves quickly, so judgment about which libraries are worth adopting matters as much as knowing how to use them.
TypeScript has become the practical standard for any codebase meant to last. Strict mode, discriminated unions and well-designed types act as living documentation and catch large classes of mistakes before runtime. We expect JavaScript developers on your team to use it confidently and to explain when types help and when they get in the way. Engineers who understand the platform can also work effectively without a framework, which keeps small widgets and marketing pages light and fast.
How we vet JavaScript developers
Our screening starts with language fundamentals: scope, this binding, promises, async iteration and error handling. Candidates then solve problems in TypeScript, work through a debugging exercise in browser dev tools and Node, and review a pull request containing subtle bugs, such as unhandled rejections or unsafe type assertions. We also look at how candidates read other people's code, since most real work involves extending an existing project, and weak readers tend to write fragile patches.
We add platform knowledge as the role requires: DOM and browser APIs, web workers, service workers, bundlers such as Vite and esbuild, ESLint rules, package management and supply-chain hygiene. Security topics matter too, including cross-site scripting, prototype pollution and safe handling of third-party scripts. Good developers explain trade-offs plainly, for example why a small utility is better than a large dependency, and why a build step is worth its complexity.
What the engagement looks like
Tell us the product, stack and the kind of work, whether front end, back end or both, and we send profiles in about two business days. Developers use your repositories, tickets and CI, and demonstrate progress every week so decisions never wait for a quarterly review. The first weeks usually go on environment setup, a read-through of the code and a small production change, which gives both sides an honest view of fit.
One developer can extend a team, or several can form a delivery squad with QA. We ask for 30 days notice when changing team size. NDAs are available on request, and all code and IP is assigned to you. AI coding assistants support routine work, with human review on every merge. If priorities shift from interface work to server work, the same engineer can often follow the change, which makes planning easier.
Why teams hire from Speqto
A bench, not a single freelancer
If an engineer is unavailable or the fit is wrong, a replacement comes from the same bench, with knowledge handed over.
Typed front-end and back-end code with strict compiler settings, shared types across packages and linting rules that match your team's conventions.
Browser and web platform work
Features using modern browser APIs, offline support with service workers, performance-sensitive interactions and compatibility across the browsers your customers actually use.
Node.js services and tooling
APIs, command-line tools, build scripts and integrations written in TypeScript, with tests and sensible error handling from the first commit.
Monorepo and build setup
Workspaces with pnpm or Nx, shared configuration, fast builds and caching so several packages evolve together without friction.
JavaScript to TypeScript migration
Incremental adoption of types in existing codebases, starting at the boundaries and the riskiest modules, without halting feature work.
Code quality and security review
Audits of dependencies, bundle size, error handling and common web vulnerabilities, ending in a prioritized, practical list of fixes.
Skill set
Skills and tools your JavaScript hire brings
Matched against your stack during screening, not listed for decoration.
JAJavaScript (ES2023)
TypeScript
Node.js
DEDeno
Vite
ESesbuild
ESLint
Jest
VIVitest
Playwright
PNpnpm
Webpack
How we vet
Five filters before you see a profile
You only interview engineers who have already cleared code review, a live problem-solving session and a communication check.
1Role brief matched to our bench
2Code and project review
3Technical assessment
4Live problem solving
5Communication and culture check
How to hire
Hire JavaScript talent in four steps
A short, low-risk path from your brief to a working engineer. If the first engineer is not right, we replace them.
1
Share your brief
Tell us the role, stack, hours overlap and how long you need the engineer. A 20-minute call is usually enough.
2
Get vetted profiles
In about two business days you receive candidates with assessment notes, code samples and availability.
3
Interview and trial
Speak to the engineers yourself. Start with a short paid trial and continue only if the fit is right.
4
Onboard and ship
Your engineer joins stand-ups and repositories, demos weekly and is backed by a delivery lead.
Included
Every engineer comes with
No hidden extras: the basics of a safe, managed engagement are part of the package.
NDA and IP assignment
Signed before details are shared; everything built is yours.
Weekly progress reports
Plain-language updates and a demo of working software.
Replacement from our bench
If the fit is wrong, a new engineer joins with a proper handover.
Your tools and repositories
Your Git, tickets and chat; we adapt to your process.
Equipment and payroll handled
Hardware, leave and compliance stay with Speqto.
30 days notice to scale
Add engineers or release them as your roadmap changes.
Compare options
Speqto, freelancer or in-house hire
Speqto dedicated engineer
Freelancer
In-house hire
Time to start
About one week
Days, but quality varies
Often two to four months
Vetting
Practical assessment and senior review
You test every candidate
You run the whole process
If someone leaves
Replacement from our bench
You start the search again
Gap until the next hire
Management
Delivery lead plus your direction
Entirely yours
Entirely yours
Scaling
Add or release with 30 days notice
One person at a time
Slow and costly to reverse
IP and NDA
Assigned to you by contract
Depends on the agreement
Standard employment terms
Equipment and payroll
Handled by Speqto
Their own
Yours
FAQ
Hire JavaScript Developers FAQs
Straight answers on cost, timelines, IP ownership, team setup and how we work. Cannot find yours? Ask a solutions architect directly.
TypeScript for almost anything beyond a quick prototype. It makes refactoring safer and documents data shapes, especially with several developers. The extra setup is small, and our developers can configure it so it helps rather than slows the team.
Can one JavaScript developer handle both front end and back end?
Often yes for early products and internal tools, because the language is shared. As complexity grows, specialists produce better results. We will tell you honestly which setup fits your scope instead of overselling a single person.
How do you manage JavaScript dependency risk?
By pinning versions, running automated audits, reviewing new packages before adoption, keeping the tree small and updating regularly. We also watch for abandoned libraries and prefer standard browser or Node features when they are sufficient.
What if our codebase is old jQuery or plain scripts?
Our developers can modernize it gradually: adding modules and a build step, writing tests around critical behavior, replacing jQuery where it hurts and introducing TypeScript at the edges. This avoids a risky rewrite. Each step ships independently.
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