JavaScript codebases that grew without structure reach a point where each change breaks something nobody expected.
Hire JavaScript Developers for Web Apps, Browser Integrations & Legacy Script Cleanup
JavaScript engineers who understand the language underneath the frameworks. They can work in React, Vue or plain scripts, and they leave code easier to change than they found it.
- Modern ECMAScript, modules and async code
- Works across the browser and Node.js
- Adds types and tests to code that has neither
- Interview the developer before any agreement
- DaysTo a shortlist
- MonthlyContract terms
- YoursCode and IP
Teams That Build With SyntecHire
References available on request.
What You Can Build With JavaScript
Interactive Web Apps
Browser applications with client-side routing, live validation and state that survives a page reload.
Tech Stack
- JavaScript
- React
- Vite
- REST APIs
Outcome
Users complete tasks in the browser without waiting on full page loads.
JavaScript is standardised as ECMAScript by Ecma International, and a new edition of the specification is published every year.
Technical Expertise Our JavaScript Developers Bring
Closures, prototypes, scope and the event loop, understood well enough to debug code without guessing.
- Closures
- Prototypes
- Event Loop
Promises and async functions with proper error handling, cancellation and no unhandled rejections.
- Promises
- async/await
- AbortController
Direct use of the DOM, storage, observers and service workers when a framework is not needed.
- DOM
- Fetch API
- Service Workers
TypeScript for new code and JSDoc annotations for older files that cannot be converted yet.
- TypeScript
- JSDoc
- Type Checking
Working knowledge of the major front-end frameworks, with depth in the one your project uses.
- React
- Vue
- Angular
Server-side JavaScript for APIs, scripts and tooling, including streams and package management.
- Node.js
- Express
- npm
Bundlers, transpilers and linters configured so builds are quick and output is predictable.
- Vite
- webpack
- esbuild
Unit tests for logic and browser tests for user journeys, run automatically on each pull request.
- Jest
- Vitest
- Playwright
How JavaScript Has Evolved
- 1995
JavaScriptCreated
Created by Brendan Eich at Netscape for use in the browser.
- 1997
ECMAScript 1Standard
The first edition of the language standard was published by Ecma.
- 2009
ECMAScript 5Strict mode
Added strict mode, native JSON support and new array methods.
- 2015
ECMAScript 2015ES6
Classes, modules, arrow functions, promises and block-scoped variables.
- 2017
ECMAScript 2017async/await
Async functions made asynchronous code read like synchronous code.
- 2020
ECMAScript 2020Modern syntax
Optional chaining, nullish coalescing, BigInt and dynamic import.
When JavaScript Is The Right Choice
Choose JavaScript when
- The product runs in a browserJavaScript is the language browsers run natively, so every web interface involves it.
- You want one language across the stackWith Node.js, the same developers can work on the interface and the server.
- You rely on many third-party servicesMost web services publish a JavaScript client, which shortens integration work.
- You need a working prototype soonThere is no compile step to set up and the package ecosystem covers most common needs.
Consider something else when
- The workload is heavy computationNumber crunching, video processing and similar tasks suit compiled languages better.
- Many developers share a large codebaseUntyped code becomes hard to refactor at that scale. TypeScript is the safer choice.
- The app needs deep access to device hardwareNative mobile development gives more direct control over sensors and background work.
Why CTOs Choose Us
Screening covers how JavaScript itself behaves, so developers are not lost when the framework changes.
You interview the developer and see how they reason about code before any agreement is made.
Code goes into your repository and follows your linting, review and release process. An NDA precedes code access.
Your developer is not shared with other companies.
Engagements are month to month with no exit fee, and we replace the developer if the fit is wrong.
How Your Developer Joins The Team
- 1Step 1
Discovery
A call about your stack, team and the work ahead.
- 2Step 2
Matching
A shortlist of people who have done similar work.
- 3Step 3
Onboarding
Access, environment setup and a first small task.
- 4Step 4
Shipping
Regular pull requests inside your review process.
AI In Delivery
Where coding assistants help, and where a person decides.
Used for speed
Boilerplate, test scaffolding and first drafts of documentation.
Always reviewed
Every change is read and approved by an engineer before it merges.
Never given secrets
Credentials and client data stay out of prompts. Your policy on AI tools applies.
Security And IP
What we enforce on every engagement.
IP assignment
All work product is assigned to you in the contract.
NDA first
Signed before anyone sees your code.
Least privilege
Access limited to what the task needs.
Clean exit
Access revoked and handover documented when work ends.
JavaScript Developer Pricing Tiers
- Early career
Entry
On request
- Works on defined tasks
- Pairs with a senior reviewer
- Suited to well-scoped backlog items
- Mid level
Experienced
On request
- Owns features end to end
- Reviews others' code
- Suited to most product teams
- Senior
Expert
On request
- Leads architecture decisions
- Mentors the team
- Suited to complex or legacy systems
Rates depend on seniority, stack and team size. We quote a fixed monthly figure per developer.
What Is Included In The Rate
| SyntecHire dedicated developer | Typical freelancer | |
|---|---|---|
| Screening and onboarding | Included | Your time |
| Replacement if the fit is wrong | Included | Start again |
| Continuity and handover notes | Included | Varies |
| IP assignment and NDA | In the contract | Varies |
| Availability | Full time on your product | Shared across clients |
Is A Dedicated Developer The Right Fit?
Five quick questions.
1Is the work expected to run for three months or longer?
2Do you have someone who can set priorities each week?
3Is there an existing codebase or a clear specification?
4Do you want the developer inside your own tools and reviews?
5Would losing context between contractors hurt the project?
0 of 5 answered. Answer every question to see the result.
Related Insights
View All Articles- HiringHow to brief a remote developer so week one is productiveA short checklist covering access, context and a first task that is small enough to finish.
- Project ManagementStaff augmentation or a dedicated team: a decision you can make in ten minutesFour questions about ownership, runway and management time that settle the choice.
- ModernisationSigns your legacy platform has become a business riskWhat to look for in release frequency, incident history and hiring difficulty.
JavaScript Hiring Questions
If your product is built on one framework and will stay there, hire for that framework. If the work spans plain scripts, several frameworks or Node.js, a strong JavaScript generalist is the better match.
Most do. Say in the brief whether your codebase is typed, partly typed or plain JavaScript and we will match on that.
Yes. Maintaining and gradually modernising older scripts is common work. The developer will suggest a staged plan instead of a rewrite.
Candidates review and change an existing codebase, then sit a technical interview on language behaviour, async code and debugging. We also assess communication.
Your company. All code and IP belong to you under the contract and live in your repositories.
Yes. Because terms are month to month, you can add people or reduce the team as the workload changes.