Senior TypeScript developers, based in the US, working your hours
Type-safe front-ends and back-ends, built by engineers who use TypeScript to catch bugs before your customers do.
- Every engineer lives and works in the US
- Works your hours, joins your standups
- NDA and full IP assignment from day one
Book your call: tell us what you need
"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."
Sound familiar?
- Hiring a senior TypeScript developer full-time is taking months.
- Your TypeScript 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 TypeScript engineers build
Full-stack apps
TypeScript across the front-end and back-end with shared types.
JavaScript to TypeScript
Existing codebases migrated gradually without freezing feature work.
APIs
Typed APIs and SDKs your other teams can use with confidence.
How it works
- 01
15-minute call
Tell us what you need built or fixed and where it's stuck.
- 02
Matched profiles
You meet US-based engineers with directly relevant work behind them.
- 03
You interview
Run your own technical interview. You only move forward with people you pick.
- 04
They start shipping
Onboarded into your repo, tools, and review process, with a weekly written update.
Hire US-based TypeScript developers from NextGen Coding Company to work on your JavaScript-to-TypeScript migration, React application, or Node.js API. For TypeScript 5.x projects, define the work around concrete needs: strict compiler settings, runtime validation with Zod, typed database access through Prisma, or package boundaries in a pnpm workspace. Every engineer lives and works in the US, with no offshore subcontracting.
A TypeScript codebase needs more than interfaces added to existing JavaScript. Untyped dependencies, inconsistent ESM and CommonJS imports, and slow builds can make everyday changes difficult. Discuss your tsconfig, Node.js version, test coverage, and CI pipeline when matching an engineer. Our senior engineers work your hours and join your standups; an NDA and full IP assignment are signed before anyone touches code.
Frequently asked questions
- Can we migrate JavaScript to TypeScript without rewriting everything?
- An incremental migration is often practical. Start with allowJs, convert shared modules in manageable batches, and introduce stricter checks as the code becomes ready. Use Vitest or Jest to protect existing behavior. Avoid replacing every unknown value with any; validate external inputs and make uncertain types explicit at application boundaries.
- What should we assess when hiring a senior TypeScript developer?
- Ask candidates to explain a real type error, model a discriminated union, and distinguish compile-time guarantees from runtime validation. For backend work, include Node.js error handling and API contracts. For frontend work, examine React state modeling. NextGen engineers are senior, and many have more than ten years of experience.
- Can TypeScript types be shared between React and Node.js?
- Yes, but shared types need deliberate boundaries. A pnpm workspace or Nx monorepo can hold API contracts consumed by React and Node.js packages. Keep database internals out of browser bundles, and remember that TypeScript types disappear at runtime. Zod schemas or generated OpenAPI clients can help keep external payloads aligned.
- How should we fix TypeScript ESM and CommonJS import errors?
- First check the Node.js version, package.json type field, file extensions, and TypeScript module and moduleResolution settings. NodeNext and bundler resolution serve different execution environments. Reproduce the failure in the actual runtime, not only the editor, and inspect dependency exports before changing compiler settings across the repository.
- How quickly can we interview a US-based TypeScript developer?
- Most teams interview matched engineers within a week of the first call. Bring your framework versions, repository structure, and immediate technical priorities so the conversation stays specific. Book a 15-minute call to get started. If the match is not right, we bring in a replacement with a proper hand-over.
- 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
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