// US-based TypeScript developers · SaaS
Free project plan & cost estimate in 48 hours.
Senior TypeScript developers for SaaS companies, based in the US
Engineers who have shipped multi-tenant products, care about uptime and onboarding, and help your roadmap move faster without piling up debt.
- 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?
- The roadmap is slipping and hiring can't keep up.
- Tech debt makes every new feature slower to ship.
- Performance and reliability issues are showing up in churn.
- You need senior engineers who can own features end to end.
What our TypeScript engineers build for SaaS companies
SaaS product work
Multi-tenant features, billing, permissions, and dashboards built to scale.
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.
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 TypeScript SaaS developers from NextGen Coding Company for multi-tenant applications, subscription workflows, and customer-facing APIs. Define the role against your stack: Next.js App Router, NestJS, tRPC, Prisma, or PostgreSQL. The important questions are product-specific: how tenant access is enforced, where entitlements are checked, and whether a schema change can ship without breaking existing customers or background workers.
Growing a SaaS codebase often exposes contracts that were previously implicit: organization membership, plan limits, job payloads, and API compatibility. TypeScript 5.x, Zod, and integration tests can make those boundaries easier to maintain when applied deliberately. Our US-based senior engineers join your standups and work your hours. Before repository access, we sign an NDA and full IP assignment; no work is subcontracted offshore.
Frequently asked questions
- How do we enforce tenant isolation in a TypeScript SaaS app?
- Establish tenant identity from authenticated server-side context, not an unchecked request field. Scope reads and writes consistently, and consider PostgreSQL row-level security as an additional control where appropriate. Prisma types do not enforce tenant isolation by themselves. Include integration tests that attempt cross-tenant access through APIs, exports, and background jobs.
- Should our SaaS use tRPC or a REST API with OpenAPI?
- tRPC works well when TypeScript frontend and backend teams can coordinate changes and share contracts. REST with OpenAPI is often a better boundary for public integrations, independently released clients, or non-TypeScript consumers. Evaluate versioning and deployment independence first; strong inference is useful, but it does not replace a stable external API.
- How should Stripe subscriptions connect to SaaS feature access?
- Model entitlements separately from the checkout screen and update subscription state through verified, idempotent Stripe webhooks. Decide how trials, failed payments, cancellations, and plan changes affect access. Enforce limits on the server, not only in React components, and provide a reconciliation path when local subscription records diverge from Stripe.
- How can TypeScript SaaS teams deploy database changes safely?
- Use an expand-and-contract approach: add compatible schema changes, deploy code that supports the transition, backfill data, then remove obsolete fields later. With Prisma migrations, review generated SQL and assess locking behavior. Test older workers and queued BullMQ payloads against the new schema instead of assuming every process updates at once.
- Can a US-based TypeScript engineer join our existing SaaS team?
- Yes. Our engineers follow your working hours and participate in your standups. Bring your tenant model, deployment setup, and current backlog to a 15-minute call. Most teams interview matched engineers within a week of the first call, and an unsuitable fit is handled with a replacement and 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
Inbound sales only. All form information is encrypted in transit.