JavaScript Development Services

JavaScript, Done
Properly From
Frontend to Backend

CrestCoder builds custom JavaScript solutions for businesses across India, Australia, South Africa, and the UK — interactive frontends, Node.js APIs, and full-stack applications. Not to be confused with Java; we cover that separately too.

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8+
Years building JS apps
4
Countries served
100%
In-house team
4.9/5 on Clutch · 32 verified reviews
Listed on GoodFirms
100% in-house team · no subcontracting
NDA on every project
What "JavaScript Development" Covers

One language,
the whole stack

JavaScript runs in the browser and, via Node.js, on the server — which means a single language can cover your entire application if that's what makes sense for your team.

Frontend frameworks

React, Vue, or Angular — we pick based on your project and team, with dedicated pages covering each in depth.

Node.js backends

REST and GraphQL APIs built on Node.js with Express or Fastify, sharing types and logic with a JavaScript frontend.

Vanilla JS & jQuery

Not every project needs a framework — for simpler sites and legacy maintenance, plain JavaScript or jQuery is often the right call.

What We Build

JavaScript development
services we deliver

01

Frontend UI Development

Interactive, responsive interfaces built in React, Vue, Angular, or plain JavaScript depending on project needs.

02

Node.js Backend Development

RESTful and GraphQL APIs, authentication, and server-side logic built on Node.js.

03

Full-Stack JavaScript Apps

End-to-end applications where frontend and backend share a single language and type definitions.

04

Legacy jQuery Maintenance

Bug fixes, security patches, and incremental modernisation of older jQuery-based sites.

05

Third-Party API Integrations

Payment gateways, mapping, analytics, and other third-party services wired into your JavaScript application.

06

Maintenance & Support

Dependency upgrades, security patches, and ongoing feature development under a monthly retainer.

JavaScript in Production

Platforms we've
built and shipped

Winery SaaS Platform
Web · SaaS

All-in-One Winery SaaS Platform

Challenge

A winery operations business needed a single SaaS platform to handle sales, bookings, and day-to-day operations, with a frontend and backend that could be maintained by one small team.

Solution

We built the entire stack in JavaScript — a React frontend on a Node.js and PostgreSQL backend — sharing types and validation logic across both layers to keep the codebase consistent and easier to maintain long-term.

View Full Case Study →
Connected Commerce & Logistics
Web · Commerce & Logistics

Foil Republic — Connected Commerce & Logistics

Challenge

A retail and logistics business needed their point-of-sale system connected directly to fulfilment operations, on an existing JavaScript/jQuery frontend that needed to keep working throughout.

Solution

We extended the existing JavaScript and jQuery frontend and Core PHP backend incrementally, connecting storefront sales directly to logistics and fulfilment without a disruptive rewrite.

View Full Case Study →
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Why CrestCoder

Honest framework
recommendations

We recommend, not push

React, Vue, Angular, or plain JS — we recommend whichever actually fits your project, not whichever we'd prefer to build.

TypeScript by default

Type safety on any project beyond a small script — fewer bugs reaching production, easier for new developers to onboard.

Full project visibility

Two-week sprints with a working demo at the end of each — you see real software, not slide decks.

25-30 person team, senior-led

Small enough that senior engineers stay hands-on, large enough to staff a dedicated team when you need one.

How We Work

Our JavaScript
development process

01

Discovery & stack decision

We confirm which framework (or none) actually fits your project, and decide on frontend/backend split before writing code.

02

UI/UX design

Figma designs validated against real user flows, with the component breakdown mapped out alongside the visual design.

03

Agile development

Two-week sprints with a working demo at the end of each, deployed to a staging environment you can access anytime.

04

Testing & QA

Unit and integration tests with Jest or Vitest, end-to-end coverage on larger applications before each release.

05

Launch & support

Production deployment, then an optional monthly retainer for dependency upgrades and continued feature work.

Common Questions

Frequently
asked questions

Still have questions? Contact us directly.

Is JavaScript the same as Java?+
No — despite the similar name, JavaScript and Java are different languages with different runtimes, syntax, and typical use cases. JavaScript runs natively in every web browser and, via Node.js, on the server too. If you are looking for Java specifically, we cover that as a separate service.
Do you build frontend, backend, or both with JavaScript?+
Both. On the frontend we typically use React, Vue, or Angular depending on the project. On the backend, Node.js with Express or Fastify. Many of our projects use JavaScript or TypeScript across the entire stack, which simplifies hiring and code sharing between frontend and backend.
Do you write JavaScript or TypeScript?+
TypeScript by default for any project beyond a small script or prototype. The type safety pays for itself quickly once a codebase has more than one developer or is expected to live longer than a few months. We are equally comfortable in plain JavaScript when that is what an existing codebase uses.
Can you take over an existing JavaScript codebase?+
Yes. We regularly onboard to existing JavaScript and Node.js projects. Our first step is always a technical audit covering dependency health, code structure, and any performance or security issues, then we continue development from there with a clear report of what we found.
What if I'm not sure which JavaScript framework I need?+
That is a normal place to start. On a free discovery call we will ask about your team, timeline, and what the application actually needs to do, then recommend React, Vue, Angular, or plain JavaScript honestly — whichever fits, not whichever we'd prefer to build.
How do you price a JavaScript development project?+
Most projects are quoted as a fixed price after a discovery call. A standard frontend or small Node.js API typically starts around $4,000-$10,000. Full-stack applications with custom backend logic usually run $12,000-$40,000, depending on scope.
Get Started

Tell us about
your project

We reply within 24 hours with an honest stack recommendation — no obligation.

Confidential. NDA available on request.

Ready to Start?

Build Your
JavaScript App

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