// US-based JavaScript developers
Free project plan & cost estimate in 48 hours.
Senior JavaScript developers, based in the US, working your hours
Front-end apps, back-end services, and the glue in between, built by engineers who write tested, readable code and join your standups.
- Interview engineers before you pay anything
- 100% U.S.-based, working your hours
- No brief or spec needed to get started
First 5 Dev Hours Free
Project plan. Roadmap. Cost & ROI estimation.
Real engineers. Real conversations.
Talk to an engineer. Not a salesperson.
Free · No commitment · Project-focused call
Most teams interview matched engineers within a week
Not the right fit? We bring in a replacement
Get your free project plan
Three quick steps. No brief needed.
Free · No commitment · Reply within one business day
// teams we've worked with
“NextGen scaled us from 2 to 7 dedicated engineers in under a quarter. Enterprise-grade capacity, zero agency drag.”
Sound familiar?
- Hiring a senior JavaScript developer full-time is taking months.
- Your JavaScript codebase has grown messy and every change breaks something else.
- Offshore hand-offs and time-zone gaps turn one-day fixes into week-long threads.
- You need someone senior enough to make decisions, not just close tickets.
What our JavaScript engineers build
Web applications
Fast, accessible front-ends in modern JavaScript and the framework you already use.
APIs & services
Node.js back-ends and integrations with tests, logging, and clean deploys.
Legacy cleanup
jQuery-era code modernized step by step without stopping feature work.
How it works
- 01
Pick a time
Book a 30-minute project call directly in our calendar.
- 02
Talk through the problem
Tell us what needs building, what's stuck and what success looks like. No spec needed.
- 03
Your plan in 48 hours
Get your project plan, roadmap, cost and ROI estimates. The plan is yours to keep.
- 04
First 5 dev hours free
Agree the scope with our team. Decide whether to continue before any paid work begins.
Common questions
Will this turn into a sales pitch?
No. The call is about your project: what needs building, what's stuck, and whether we have the right engineers. If we're not a fit, we'll say so.
What do I get for free?
A project plan, roadmap, cost estimate and ROI estimate within 48 hours of your project call. Your first 5 development hours are free, too. We agree the scope and any paid work with you before proceeding.
Do I need a spec or brief?
No. Tell us the problem in plain words and we'll help shape the scope with you.
Are the engineers really in the U.S.?
Yes. Every engineer lives and works in the United States. No offshore hand-offs, and that's in the contract.
What our clients say
"NextGen scaled us from 2 to 7 dedicated engineers in under a quarter. Enterprise-grade capacity, zero agency drag."
"Their R&D tax credit workflow platform paid for itself in the first filing season."
"AI-native from day one. Our IRS transcript pipeline runs 24/7 without a human in the loop."
"Property tax appeals used to take weeks. Their comp analysis tooling turned it into hours."
"The AI intake agent handles our tier-1 patient calls with a hand-off cleaner than our old call center."
"POS, inventory, ordering — all unified. We finally have one source of truth across every location."
"The procurement platform paid for itself in the first quarter of use."
"They shipped our matching engine in 6 weeks. Our old team would've taken 6 months."
"Enterprise-grade delivery without the enterprise-agency price tag."
"Their team plugged into our sprint on day one. Zero ramp time."
"NextGen scaled us from 2 to 7 dedicated engineers in under a quarter. Enterprise-grade capacity, zero agency drag."
"Their R&D tax credit workflow platform paid for itself in the first filing season."
"AI-native from day one. Our IRS transcript pipeline runs 24/7 without a human in the loop."
"Property tax appeals used to take weeks. Their comp analysis tooling turned it into hours."
"The AI intake agent handles our tier-1 patient calls with a hand-off cleaner than our old call center."
"POS, inventory, ordering — all unified. We finally have one source of truth across every location."
"The procurement platform paid for itself in the first quarter of use."
"They shipped our matching engine in 6 weeks. Our old team would've taken 6 months."
"Enterprise-grade delivery without the enterprise-agency price tag."
"Their team plugged into our sprint on day one. Zero ramp time."
Hire US-based JavaScript developers from NextGen Coding Company for React interfaces, Next.js applications, and Node.js services. Match the role to the work you actually need: fixing hydration errors, untangling shared state, building Express 5 endpoints, or migrating a large codebase toward TypeScript. A useful starting scope names your runtime, rendering strategy, test gaps, and the user journeys that currently break or feel slow.
A React 19 frontend and a Node.js 24 backend need different debugging skills, even when both use JavaScript. Use your backlog to distinguish browser performance work, Next.js App Router boundaries, API design, and dependency maintenance. Our engineers are senior; many have 10+ years of experience. They work your hours and join your standups. Book a 15-minute call to outline the role and interview priorities.
Frequently asked questions
- Should I hire a frontend or full-stack JavaScript developer?
- Choose frontend depth when the backlog centers on React rendering, accessibility, browser performance, and component architecture. A full-stack role makes more sense when delivery also requires Node.js APIs, authentication, and database changes. Describe the actual ownership boundaries rather than relying on the title, and test candidates against a representative task.
- Can a JavaScript developer migrate our application to TypeScript gradually?
- Yes. TypeScript supports incremental adoption through options such as allowJs, letting JavaScript and TypeScript files coexist. Begin with shared API shapes and frequently changed modules, then tighten compiler checks deliberately. Runtime validation remains necessary for external inputs because TypeScript types do not validate network responses or user-submitted data at execution time.
- What skills matter when hiring a Next.js App Router developer?
- Look for a clear understanding of Server Components, Client Components, caching, and server-side authorization. Candidates should explain hydration failures and distinguish rendering problems from slow data access. Ask how they would test a route with Playwright and inspect its browser bundle rather than assuming every dependency belongs on the client.
- How should developers diagnose a slow Node.js API?
- Measure request latency across the database, external calls, and application code before rewriting anything. Node.js profiling and event-loop delay metrics can reveal synchronous work blocking other requests. Check connection pools, unbounded concurrency, and oversized payloads. Reproduce the issue under realistic load, then compare the same workload after each targeted change.
- How does hiring a US-based JavaScript developer through NextGen work?
- Start with a 15-minute call covering your frameworks, backlog, and working hours. Most teams interview matched engineers within a week of that conversation. Every engineer lives and works in the US, without offshore subcontracting. We sign an NDA and full IP assignment before code access and provide a replacement with proper hand-over if needed.
- Are your developers really based in the US?
- Yes. Every engineer lives and works in the United States. No offshore subcontracting and no hand-offs to another team. That's written into the contract.
- How fast can someone start?
- Most teams interview matched engineers within a week of the first call. Start dates depend on your interview process.
Related reading
- How to hire a software developer
What to check before you sign.
- Hiring test for senior engineers
How to vet senior talent fast.
- Senior engineer salary guide 2026
What the market pays.
- Onshore vs offshore vs nearshore
The honest tradeoffs.
- Forward deployed engineers
Need an owner, not just capacity?
- Resource library
Every guide and benchmark we publish.
Start your project request
Tell us what you're building — engineering capacity, AI, QA, cloud, or a fixed-scope software engagement. Our NYC team responds within one business day.
- Response within 1 business day
- 30-minute discovery conversation
- Recommended engagement model & pricing
- NYC-focused — in-person available
Inbound sales only. All form information is encrypted in transit.