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Frequently asked questions

Is Next.js enough for a SaaS app, or do I need NestJS?

Next.js can handle a SaaS interface and request-oriented backend work in one application. A separate NestJS service becomes useful when you need independently deployed APIs, substantial background processing, or multiple clients sharing business logic. Decide from operational boundaries and workload needs rather than splitting a small product into services prematurely.

How should a Node.js SaaS application enforce tenant isolation?

Establish tenant identity from authenticated server-side context, not a client-supplied identifier alone. Apply authorization to every data access path, including exports, queues, and administrative tools. PostgreSQL row-level security can add protection, but connection handling and policies need careful testing. Include explicit cross-tenant access attempts in your integration test suite.

How do developers handle Stripe subscriptions and webhook retries?

Verify Stripe webhook signatures, record processed event identifiers, and make handlers idempotent. Do not assume events arrive in order or that checkout completion alone proves continuing access. Model subscription states explicitly, reconcile against Stripe when needed, and test failed payments, plan changes, cancellations, and replayed events before connecting billing to entitlements.

What testing tools make sense for a JavaScript SaaS product?

Vitest or Jest can cover business rules, while React Testing Library checks component behavior. Use Playwright for critical browser journeys such as signup, workspace switching, and subscription changes. API integration tests should exercise real database constraints and permission boundaries. Keep tenant isolation and billing state transitions outside a browser-only test strategy.

How quickly can I interview a JavaScript SaaS developer?

Most teams interview matched engineers within a week of their first call with NextGen Coding Company. Bring your framework versions, tenancy model, and near-term backlog to a 15-minute call. Every engineer lives and works in the US; there is no offshore subcontracting. A mismatch leads to 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.