Express, NestJS, or Fastify?

NestJS when the team is more than three engineers or the system has real domain complexity, because structure that is enforced beats structure that is agreed. Express when the surface is small and the team is senior. Fastify when raw throughput is the constraint. We confirm this in the architecture week rather than assuming it at the pitch.

Is Node.js good for high-traffic applications?

For I/O-heavy workloads, very. Thousands of concurrent connections on modest hardware is normal. The caveat is that one blocking operation degrades every request on that process, so high traffic on Node.js is an engineering discipline rather than a property you get for free.

Node.js or Python for my backend?

Node.js when the workload is real-time, connection-heavy, or when sharing types with a JavaScript frontend is worth real money. Python when the system involves machine learning, data processing, or needs an admin interface on day one. Plenty of systems run both, and we build them that way when it's the right answer.

Can you take over an existing Node.js codebase?

Yes. We start with a code and architecture review, with particular attention to blocking operations, untyped boundaries, and unbounded caches, because those are where inherited Node.js systems hide their problems. You get the findings whether or not you continue with us.

Do you always use TypeScript?

On anything we ship, yes. A JavaScript backend past roughly ten thousand lines cannot be refactored safely, and every hour saved by skipping types is repaid with interest in the second year.

Which industries do you build Node.js systems for?

Real-time SaaS, fintech, logistics, retail, and healthcare. Our deepest Node.js work sits in event-driven and notification-heavy platforms. We will tell you on the call whether your domain is one we have shipped in or one we would be learning.

You do, throughout. Source, infrastructure, and documentation transfer at handover, and you have repository access from the first sprint.

Node.js web development

Node.js web development services

Real-time applications and APIs, engineered to hold their throughput under load.

40+AI systems shipped to production
3.5×Median speed-up vs. in-house build
99.9%Uptime across deployed models

What we build

Node.js web application development services

Node.js gets chosen for the wrong reason more often than any other backend. Teams pick it because the frontend is already JavaScript, then discover that the event loop has rules and nobody wrote them down. Our Node.js web development services start with the concurrency model, because that is the thing that decides whether the system holds. Every one of these gets scoped to the system you have, not to a package.

Serverless and edge deployment

Node.js is the default runtime on Lambda, Vercel, and Cloudflare Workers. We build for cold starts, execution limits, and connection pooling from the beginning, because retrofitting a serverless system is close to a rewrite.

Learn more

Migration and modernization

JavaScript to TypeScript, Express to NestJS, or a legacy backend moved onto Node.js. We map the risk before touching anything, and you get the assessment whether or not you continue with us.

Learn more

Tech & tools

Our Node.js web development stack

We pick the framework for the constraint, not the habit. Any Node.js web development company can list Express. The useful question is when each one wins.

NestJS

When the team is more than three engineers or the system will outlive its authors. Opinionated structure, dependency injection, and modules mean a new engineer finds their way around in a day. Our default for platforms with real domain complexity.

Express

When the surface is small and the team is senior. Minimal, unopinionated, and everywhere. The cost is that structure is your responsibility, and Express codebases drift without discipline.

Fastify

When throughput is the constraint. Lower overhead per request and schema-based validation built in. Our default for high-volume APIs and gateway services.

TypeScript on all three. Not optional on anything we ship. A JavaScript backend past about ten thousand lines becomes a system nobody can refactor safely.

Runtime & frameworks

Node.js LTS
TypeScript
NestJS
Express
Fastify

Real-time

Socket.IO
ws
Server-Sent Events
Redis pub/sub

Data

PostgreSQL
MongoDB
Redis
Prisma
Drizzle

Queues

BullMQ
RabbitMQ
Kafka

Infra

Docker
Kubernetes
AWS Lambda
Vercel
GitHub Actions

Quality

Vitest
Playwright
ESLint
Sentry
OpenTelemetry

How we design

Node.js web application architecture

Node.js fails differently from other backends. It rarely falls over. It gets slow, everywhere at once, for reasons that don't show up in a single slow query. Four decisions we make deliberately.

Keeping the event loop free

Node handles thousands of concurrent connections on one thread, which works until something blocks. A synchronous JSON parse over a large payload, an unbounded loop, a regex on user input, and every request on that process stalls. CPU-bound work goes to worker threads or off the box entirely. We set an event loop lag budget and monitor against it from the first release.

Where the types live

Shared type definitions between API and client, in a monorepo or a published package. The contract is enforced by the compiler rather than by a document nobody reads. This is the difference between TypeScript as a formality and TypeScript as an architecture.

The process model

Node scales by running more processes, not more threads. That means designing stateless from the start: sessions in Redis, no in-memory caches that diverge between instances, and WebSocket state that survives a connection landing on a different server.

Memory over time

Node processes run for weeks. A listener added and never removed, a cache with no eviction, and the heap climbs until the container restarts at three in the morning. Heap monitoring and load testing that runs long enough to expose it, not just long enough to hit peak.

Runtime path

01
Event loop
I/O stays non-blocking; lag is budgeted
02
Worker threads
CPU-bound work leaves the main process
03
Redis pub/sub
Shared state across Node processes

Industries

Node.js web development across industries

Domain logic differs by sector. The concurrency model does not.

Node.js web development for real-time SaaS and B2B collaboration platforms

Real-time SaaS and B2B platforms

Live collaboration, presence, and instant notification are Node.js at its strongest. Our event notifier build runs on exactly this pattern: publish once, fan out, keep the read path cheap. Where a platform needs users to see the same state at the same moment, this is the stack we reach for first.

Explore SaaS

Fintech

Transaction feeds, live position updates, and event-sourced ledgers suit an event-driven runtime well. One caution we raise early: JavaScript's native number type is not safe for currency, so money is handled in minor units or a decimal library from the first commit rather than discovered during reconciliation.

Explore Fintech

Node.js web development for logistics fleet tracking and live ETAs

Logistics and supply chain

Fleet tracking, live ETAs, and dispatch systems are thousands of low-payload connections, which is the workload Node.js handles better than almost anything. We can build the socket layer, the geospatial queries, and the operator dashboard on one runtime.

Explore Logistics

Retail and e-commerce

Traffic in retail is spiky, and Node.js on serverless scales to a launch peak and back down without paying for idle capacity. We can build the storefront API, the checkout flow, and the inventory sync in one codebase with types shared to the frontend.

Explore Retail

Healthcare

Appointment systems, clinical dashboards, and integrations with existing record systems. We can build the API layer and the audit trail on Node.js, though where the work is heavy clinical data processing we will usually recommend Python underneath it.

Explore Healthcare

Discovery

Plan your Node.js web development project

Bring us the system you're building or the one that stopped scaling. Discovery takes one to two weeks and produces an architecture proposal and a fixed estimate.

You keep the document either way.

Node.js web development services — technical discovery call

Scoping

Node.js web development cost factors

We scope from the constraint, not from a price list. Five things move the number on a Node.js build.

Concurrency requirements

Five hundred simultaneous connections and fifty thousand are different systems. Presence, reconnection, and message ordering each add real engineering time, and they need designing in rather than adding later.

Integration count

Every external system carries its own auth, rate limits, and failure modes. Three integrations and eleven are different projects.

TypeScript debt

If you have an existing JavaScript codebase, migration cost sits mostly in the untyped boundaries between modules. We assess this in discovery rather than estimating around it.

Deployment target

Serverless, containers, and a long-running server have different architectures, not just different hosting bills. Choosing late is expensive.

Who operates it after launch

A system your team runs needs different documentation, tooling, and observability than one we maintain.

Discovery produces a fixed estimate. You see the number before you commit to the build.

When Node.js is the wrong choice

We would rather tell you now than three months in.

CPU-bound work
Image processing, video transcoding, and heavy computation block the event loop and take the whole process down with them. Worker threads help. A different runtime helps more. Go or Rust.
Machine learning and data science
The libraries live in Python and they are not close to being matched. We build the Node.js API and put Python underneath it rather than pretending otherwise. Python web development services.
Systems that need an admin out of the box
Node.js has no equivalent to Django's admin. If your operations team needs a working interface over the data model on day one, Django saves months. Python web development.
Native mobile
Node.js builds the backend the app talks to, not the app. Flutter, Swift, or Kotlin. Custom app development.

We build in eight stacks. The recommendation follows the problem. See engineering services.

How we engage

Node.js web development engagement models

All three carry the same handover terms. Source, infrastructure, and documentation are yours throughout, and you have repository access from the first sprint.

Fixed scope

Defined requirements, agreed deliverables, a fixed price. Best when the problem is well understood and the boundary is clear. You know the total before work starts, and change requests are priced separately rather than absorbed silently.

Variable scope

Sprint-based delivery with priorities set at each sprint boundary. Best when discovery is ongoing or requirements will move. You can redirect the team every two weeks without renegotiating the contract.

Staff augmentation

Our Node.js engineers working inside your team, under your process and your management. Best when you have the direction and need capacity. Engineers stay with your project rather than rotating.

How we work

Our Node.js web development process

A defined path from technical scope to handover, with repository access from the first sprint.

How to choose

Choosing a Node.js web development company

Node.js has the widest quality spread of any backend stack, because the barrier to writing some is low and the barrier to writing it correctly is not. Ask any Node.js web development company how it keeps the event loop free and how it scales WebSockets past one server. The answer separates them quickly.

The honest case for an in-house hire: if this system is your core product and needs continuous work for years, hire. We will say so on the call. Our work is strongest when you need senior Node.js capacity now, or when the build has a defined end.

Criterion	Xorora	In-house hire	Freelancer
Time to start	1–2 weeks	8–14 weeks to hire	1–3 weeks
Senior Node.js availability	Immediate	Competitive market	Variable
Architecture review	Included	Depends on the hire	Rarely
Continuity if someone leaves	Team-backed	Single point of failure	Single point of failure
Cost after launch	Scales down	Fixed salary	Depends on availability
Source and infra ownership	Yours	Yours	Negotiate

Time to start

Xorora
1–2 weeks
In-house hire
8–14 weeks to hire
Freelancer
1–3 weeks

Senior Node.js availability

Xorora
Immediate
In-house hire
Competitive market
Freelancer
Variable

Architecture review

Xorora
Included
In-house hire
Depends on the hire
Freelancer
Rarely

Continuity if someone leaves

Xorora
Team-backed
In-house hire
Single point of failure
Freelancer
Single point of failure

Cost after launch

Xorora
Scales down
In-house hire
Fixed salary
Freelancer
Depends on availability

Source and infra ownership

Xorora
Yours
In-house hire
Yours
Freelancer
Negotiate

Good to know

Node.js web development FAQs

Ask how they keep the event loop free under load, and how they scale WebSocket connections across more than one server. Those two answers tell you more than a portfolio does. Ask whether they ship TypeScript in strict mode. Ask who owns the source and infrastructure after launch.

Power your next digital move.

Tell us what you're building. We will tell you what it takes, what it costs, and whether Node.js is the right call.

Most conversations start with a 30-minute technical call. No deck.