Node.js Development Services

PS3G provides Node.js development services for teams whose front end is JavaScript and who want the backend to speak the same language. That is a founder shipping a React or React Native product with one small team, a growing company that needs a real-time feature or a fast API in front of older systems, or a product group inside a larger organization standardizing on TypeScript end to end. We build Node.js APIs, backends-for-frontend, serverless functions and event-driven services, in TypeScript, with the tests and pipelines to run them.

Node.js Development Services: what we build and for whom

Node.js earns its place in two situations: when the team is already JavaScript-first and a second language would split it, and when the workload is many concurrent, I/O-heavy requests rather than heavy computation. APIs, chat and notification services, webhook handlers, gateways and backends for single-page and mobile apps all fit that description. As a Node.js development company we see most of our work in these shapes.

• APIs for web and mobile apps. REST or GraphQL backends with authentication, validation and documentation, often sharing TypeScript types with the React or React Native client. The full-stack version of this is our web application development service.
• Real-time features. Chat, presence, live dashboards, collaborative editing and notifications over WebSockets, with the scaling questions answered before launch.
• Serverless and integration functions. Webhook receivers, scheduled jobs, event processors and API adapters on Azure Functions, AWS Lambda or Google Cloud Functions, following the patterns on our API development and integration page.
• Backend-for-frontend layers. A thin Node.js layer that aggregates several internal services into the exact shape a front end needs, which is often how Node.js enters a .NET or Java estate.

Node.js is the wrong choice for CPU-bound work: video processing, large numeric computation, heavy reporting over big tables and long-running batch jobs are better placed in .NET, Java or Python, and we build those too. It is also the wrong choice for a team whose skills, hosting and standards are entirely Microsoft, where ASP.NET Core gives the same API with less to learn. We make that call in the assessment.

What the service covers

Our nodejs development work is TypeScript by default and covers the full lifecycle. The table lists the typical work and our usual tools.

Type of work	What it looks like	Typical tools
REST API development	Resource design, validation, authentication, rate limits, OpenAPI documentation, versioning	NestJS or Fastify or Express, Zod, OpenAPI, Passport or OpenID Connect
GraphQL	Schema design, resolvers, data loaders, subscriptions, federation across services	Apollo Server, GraphQL Yoga, Pothos
Real-time services	WebSocket gateways, presence, pub/sub fan-out, horizontal scaling with a shared broker	Socket.IO or ws, Redis, Azure Web PubSub or managed equivalents
Serverless development	Functions for webhooks, scheduled jobs and event processing, with cold-start and timeout handling designed in	Azure Functions, AWS Lambda, Google Cloud Functions, Serverless Framework or SST
Background jobs and queues	Email, exports, imports, retries, dead-letter handling	BullMQ, Azure Service Bus, SQS, Pub/Sub
Data access	Type-safe database access, migrations, caching	Prisma or Drizzle or TypeORM, PostgreSQL, SQL Server, Redis
Quality and delivery	Unit and integration tests, contract tests with the front end, linting, containers, pipelines, observability	Vitest or Jest, Supertest, Playwright, Docker, GitHub Actions or Azure DevOps, OpenTelemetry

If you need engineers rather than a delivered project, see hire Node.js developers for a monthly arrangement inside your team.

How we work

Node.js backend development has a specific set of ways to go wrong: an Express app that grew without structure, secrets in environment files nobody rotates, a WebSocket feature that works on one server and fails on two, and dependencies that drift until an audit lights up. Our process is built around avoiding those.

1. Assessment. The front end that will consume the API, the data, the integrations, the expected concurrency, and who will own the code. For an existing Node.js codebase, a read of the structure, dependencies, tests and deployment, written up as risks and quick fixes.
2. Architecture note. Framework choice (NestJS for larger, structured applications; Fastify or Express for small services), API style (REST or GraphQL), authentication, data access, hosting (containers or functions) and how the front end and backend share types.
3. Walking skeleton. One endpoint from request to database to deployed environment, with tests, linting, dependency scanning and a pipeline in place first.
4. Increments. Two-week deliveries with a demo, reviewed pull requests, and contract tests so the front-end team can build against the API before it is finished.
5. Hardening and handover. Load tests at expected concurrency, failure drills for the queue and the socket layer, a runbook, then handover or a maintenance agreement under defined SLAs.

Team and stack choices

A lead engineer in the United States owns the design and your weekly conversation; Node.js engineers at our India delivery center add capacity with overlapping hours; a QA engineer from our testing center of excellence tests each increment. Our express js development and nestjs development both run on a current long-term-support Node.js release with TypeScript, ESLint and a lockfile that is audited in the pipeline. We default to NestJS for anything a team will grow, because its structure keeps a large codebase legible.

Describe the API or feature you need and we will reply with a fixed-scope quote.

Where this fits with the rest of your systems

Node.js rarely replaces a system of record. It usually sits in front of one: a BFF or API layer between a React or mobile client and the services that hold the data. We design it to stay thin and well-typed, so the real logic lives where it belongs and the Node.js layer is easy to change.

Because PS3G’s core engineering practice is .NET and the Microsoft stack, we pair Node.js with ASP.NET Core often. A common shape is a Node.js BFF that aggregates several ASP.NET Core APIs for a React front end, with one identity provider issuing tokens that both sides validate, one message broker, and one observability pipeline. Node.js is also the natural place for a WebSocket gateway in front of a .NET application that was not built for real-time traffic. When a Microsoft-centered team does not already have JavaScript backend skills, we will say so and recommend ASP.NET Core instead.

With React and React Native clients, shared TypeScript packages for models, validation and API clients remove a whole class of integration bugs; we structure the repository for that from the start. On the cloud side, Node.js runs as containers on Kubernetes or a managed app platform, or as functions, on Azure, AWS and Google Cloud alike.

Examples by organization size

These are typical engagement shapes, not named clients.

• A founder with a React product. A fixed-scope NestJS API with authentication, a data model, background jobs and a deployment pipeline, sharing types with the front end so one small team can move quickly without the two halves drifting.
• A growing company adding real-time. A dedicated engineer for a few months who builds a notification and live-status service on WebSockets in front of the existing .NET application, scaled across several instances with a shared broker and tested at the concurrency the business expects.
• A product group inside a larger organization. A GraphQL gateway that federates several internal services for a new customer portal, built inside the organization’s security and procurement rules, with contract tests so internal teams can evolve their services without breaking the portal.

Engagement models

• Fixed-scope project: a defined deliverable and price for an API, a real-time feature or a set of functions.
• Dedicated team or staff augmentation: Node.js engineers inside your team on a monthly basis, scaled as the roadmap changes.
• Managed services: we run, patch, monitor and improve your Node.js services under defined SLAs.
• Advisory: a code and architecture review of an existing Node.js backend, or a framework decision.

How we start: a first conversation, a short assessment, a written proposal.

Why PS3G for Node.js work

We have been building software for more than a decade from Wilmington, Delaware and our India delivery center, with open-source-certified and Microsoft-certified engineers on the same teams, which is why Node.js and .NET cooperate well in our projects. We build and run our own products, so we know what an API has to survive after launch. Our testing center of excellence is part of every delivery team.

Related services

• All services: everything we build, test, run and advise on.
• Hire Node.js developers: engineers inside your team on a monthly basis.
• Web application development: the full-stack version, front end included.
• API development and integration: contracts, gateways and integrations across any stack.
• React development: the front end most of our Node.js backends serve.

Frequently asked questions

What do your Node.js development services include?

REST and GraphQL API development, real-time services over WebSockets, serverless functions for webhooks and jobs, background processing with queues, backends-for-frontend in front of existing systems, and the testing, deployment and maintenance around them. All of it is written in TypeScript and available as a fixed-scope project, staff augmentation, a managed service or an assessment.

Express, Fastify or NestJS: which framework do you use?

NestJS for applications a team will grow, because its modules, dependency injection and conventions keep a large codebase organized. Fastify or Express for small services and functions where that structure would be overhead. We maintain existing Express applications regularly and can add structure to one without a rewrite. The choice is made in the assessment, based on the size of the system and your team.

Is Node.js fast enough for a production backend?

For I/O-heavy workloads such as APIs, gateways, real-time messaging and integrations, yes; its event loop handles many concurrent connections efficiently. For CPU-heavy work such as video processing, large computations or heavy reporting, it is the wrong tool and we would place that work in .NET, Java or Python. We load-test at your expected concurrency before launch rather than assuming.

Can Node.js work with our .NET backend?

Yes, and that is a pattern we build often: a Node.js backend-for-frontend or WebSocket gateway in front of ASP.NET Core services, with one identity provider, one message broker and shared observability. PS3G builds both sides, so the boundary is designed up front. If your team is entirely Microsoft and has no JavaScript backend skills, we may recommend ASP.NET Core alone.

Do you build serverless Node.js functions?

Yes. Webhook receivers, scheduled jobs, event processors and API adapters run well as functions on Azure Functions, AWS Lambda or Google Cloud Functions. We design for cold starts, timeouts, idempotency and retries from the start, and we keep the function code in the same TypeScript repository and pipeline as the rest of the backend so it does not become a separate, untested island.