Node.js & full-stack JavaScript — for product teams and agencies worldwide

Node.js apps that handle real concurrency — and a team can actually ship on for a decade.

Custom Node.js engineering for APIs, real-time applications, microservices, and full-stack JavaScript products — MERN, MEAN, and Next.js. We ship Node applications with p95 latency under 200 ms, 85%+ test coverage on critical paths, typed end to end with TypeScript, and an event loop that never blocks.

Start a Node.js project See apps we have shipped

1,000⁺

Node.js apps shipped since 2015

10yrs

Building with JavaScript & Node

4.9★

Across 1,000+ reviews

200ms

p95 API latency baseline · every build

The real cost

Node.js is fast and flexible — and both of those can quietly turn against you.

Node's speed depends on one thread never being blocked, and its flexibility means the framework decides almost nothing for you. Used well, both are strengths. Used without discipline, they are how a Node app ends up slow, untyped, and shaped differently by every engineer who touched it. The three observations below are what we say out loud on every Node.js discovery call.

Node is fast — until something blocks the event loop.

Node handles thousands of simultaneous connections on a single thread by never waiting. That model is genuinely fast — and genuinely fragile. The moment one piece of synchronous, CPU-heavy code holds that thread — a large computation, a synchronous file read, a heavy parse — every other request is frozen until it finishes. A Node app that is quick in testing and stutters under real load is almost always blocking the event loop somewhere, and the team usually does not know where. Keeping the loop unblocked is not an optimisation; it is the core discipline of writing Node well.

JavaScript everywhere only pays if it is TypeScript everywhere.

The strongest argument for Node is one language across the whole stack — frontend, backend, shared logic. That advantage is real, but it only fully pays in TypeScript. Plain JavaScript on a backend that handles money, auth, and user data means every refactor is a gamble and every new engineer onboards by reading carefully and hoping. TypeScript turns those gambles into compile-time guarantees, and lets a team genuinely share types from the database to the browser. A serious Node backend in 2026 is a TypeScript backend — checked in strict mode, treated as a build failure when a type is wrong.

Node gives you everything and decides nothing.

Node and npm hand you a near-infinite menu — every framework, every library, every pattern — and impose no structure at all. For a disciplined team that is freedom. For most teams, over time, it is drift: every engineer organises code differently, validation is done five ways, the project structure is whatever it accreted into. Two years on, the codebase is hard to onboard into and harder to change. Good Node engineering means making the structural decisions deliberately and early — the framework, the project shape, the conventions — and holding them, because Node itself will not hold them for you.

What we build

Six kinds of Node.js build, each engineered to last a decade.

Node.js APIs & microservices

REST and GraphQL APIs and microservice backends in TypeScript. Express, Fastify, or NestJS depending on the project. Typed request and response validation, rate limiting, versioning, OpenAPI documentation, and an event loop kept clear under load.

Real-time applications

Live dashboards, chat, collaboration, notifications, streaming feeds. WebSocket and Socket.io, server-sent events, presence and connection management at scale. Node's concurrency model is at its best here, and so is our engineering around it.

Full-stack JavaScript (MERN, MEAN, Next)

Whole products in one language — MERN (React) and MEAN (Angular) stacks, and Next.js full-stack apps. A Node backend, a JavaScript frontend, and shared types between them, so a small team ships fast without context-switching across languages.

NestJS enterprise backends

Structured, opinionated Node backends for larger applications and teams. NestJS with modules, dependency injection, and TypeScript throughout — the architecture decided so consistency holds as the codebase and the team grow. The right choice for long-lived, multi-engineer products.

Express & Fastify services

Lean, focused services where minimalism is the right call — Express for ubiquity and a fast start, Fastify where performance and schema-based validation matter. Light frameworks, with the structure, types, and tests we add deliberately on top.

Performance audits & migrations

p95 latency under 200 ms, event-loop lag under 50 ms, no runaway memory. Profiling, event-loop unblocking, async-pattern fixes, and JavaScript-to-TypeScript and Express-to-NestJS migrations — one major step at a time, tests passing throughout.

Beyond the build

The work that keeps the Node.js app healthy after launch.

A Node app is healthy only as long as someone is watching the event loop, the memory, the dependencies, and the security patches. We offer three engagement types alongside the build itself.

Node migrations & upgrades

Legacy Node brought up to current versions and patterns — old callback-based code to async/await, plain JavaScript to TypeScript, Express to NestJS where the structure is needed. One major step at a time, tests passing at each step, no big-bang rewrites.

JavaScript → TypeScript with strict checking
Callback / promise-chain code → async/await
Express → NestJS where structure is needed
Node version upgrades · dependency modernisation

Performance audits & ongoing engineering

Monthly retainers covering security patches, Node version updates, dependency upgrades, event-loop and memory monitoring, error tracking with Sentry, slow-query review, and a fixed allocation of engineering hours per month for fixes, small features, and refactors.

Event-loop lag & memory monitoring
Security patches · weekly cadence
Dependency upgrades with npm audit
Allocated hours: bug fixes, small features, refactors

Security audits & compliance

OWASP Top 10 audits on every build. Dependency vulnerability scanning with npm audit on every CI run — critical for Node, where a deep dependency tree is a real attack surface. PCI and SOC 2 control implementation. Security is part of the build, not a fix before launch.

OWASP Top 10 audit on every release
npm audit on every CI build · dependency tree reviewed
PCI / SOC 2 control implementation
Pen-test remediation as a service

Backend & reliability scoreboard

The numbers every Node.js build we ship has to hit.

Every Node build is shipped against four hard targets. We measure, we tune, we re-measure. Below the line, the build is not done until each number is in the green.

01 — API latency & the event loop

p95 under 200ms · event-loop lag under 50ms

p95 is the latency metric that matters — the median hides the slow tail. For Node there is a second number just as important: event-loop lag, how long the single thread is held away from requests. Both are measured continuously in production.

02 — Test & type coverage

85%+ tests · TypeScript strict · Vitest / Jest

Test coverage on critical paths above 85%, and the whole codebase typed and checked with the TypeScript compiler in strict mode on every CI run. Tests and types together are what make a Node codebase safe to refactor and safe to grow.

03 — Security & OWASP

OWASP Top 10 passing · dependency tree clean

SQL and NoSQL injection, XSS, CSRF, SSRF, broken access control, vulnerable dependencies — every Node build is audited against the OWASP Top 10, and npm audit runs on every CI build. Node's deep dependency tree is a real attack surface, and we treat it as one.

04 — Observability & uptime

Sentry · structured logs · 99.9% uptime SLA

Production error tracking on every Node build with Sentry. Event-loop and memory metrics monitored with alerting. Structured, searchable logging. Uptime monitoring. The team finds out about a problem before customers do.

How we work

Five steps from brief to a Node.js app your team can run for a decade.

The process below has stayed the same for ten years and 1,000+ Node builds. Every step is required. Skipping any one of them is how Node apps end up slow, untyped, or shaped differently by every engineer.

Brief and API spec

We learn the application, the team, the existing codebase if any, the integrations, and the performance and concurrency targets. We finish with a written brief, an API specification on paper, and a data model diagram.

Architecture and data modelling

Database schema and indexes. The framework decision — Express, Fastify, or NestJS — and the project structure that Node will not impose for us. Service boundaries, caching strategy, real-time strategy, auth strategy. The architecture is decided before any feature work starts.

Custom Node.js build

TypeScript in strict mode from the first commit. Async written to run concurrently, CPU-heavy work kept off the main thread. Tests alongside the code. Weekly demos, two-week sprints, preview deploys on every pull request.

Security and load testing

OWASP Top 10 audit. npm audit for vulnerable dependencies. Load testing against expected production traffic, watching event-loop lag and memory under pressure. p95 latency tuning. The team that will run the app uses it before launch.

Launch, monitor, maintain

Launch checklist. Sentry error tracking live. Event-loop and memory monitoring with alerting. Structured logging enabled. Uptime monitoring. Monthly maintenance from day one. Quarterly security and performance reviews.

Selected work

Node.js apps we have shipped across APIs, real-time, full-stack JavaScript, and microservices.

Six Node.js applications from the last 24 months. Every one passes the backend scoreboard targets, runs OWASP-clean, types clean under TypeScript strict, and a mid-level Node engineer can pick it up on day one.

Meridian Realtime

p95: 88ms · WebSocket: 30ms · AA

Real-time ops dashboard · Node + WebSocket

Stratos API

p95: 96ms · 90% covered · SOC 2

Multi-tenant SaaS API · NestJS

Frondhill Stack

p95: 104ms · 87% covered · AA

MERN full-stack app · one language

Aurora Gateway

p95: 72ms · 6 microservices

API gateway & microservices · Express

Postbrew Live

p95: 92ms · 2,400 concurrent

Real-time commerce · Socket.io

Chayya BFF

LCP: 1.0s · p95: 84ms · typed ✓

Next.js + Node backend-for-frontend

Need a Node.js app that handles real concurrency without stuttering?

Send us a brief about the application, the team, and the integrations. We will come back with a free, honest plan — fixed scope, fixed targets, no slides.

Request a discovery call

Where it shows up

Four kinds of Node.js build, one engineering team behind them.

The same Node.js capability adapts to four very different surfaces. The engineering discipline stays constant; what changes is the framework, the concurrency shape, and the architecture.

APIs & microservices

REST & GraphQL backends

Node APIs and microservice backends for web and mobile products and partner integrations. TypeScript throughout, typed validation, rate limiting, versioning, and OpenAPI documentation.

Real-time applications

Live, connected experiences

Dashboards, chat, collaboration, notifications, live commerce. WebSocket and Socket.io, presence and connection management — the workload Node's concurrency model is genuinely best at.

Full-stack JavaScript

MERN, MEAN & Next.js products

Whole products in one language — a Node backend, a JavaScript or TypeScript frontend, shared types between them. The efficient path for a small team building fast.

Enterprise NestJS

Structured, long-lived backends

NestJS backends for larger applications and teams — modules, dependency injection, conventions that hold consistency as the codebase and the engineering team grow.

Client stories

Two Node.js engagements, and what changed for the businesses behind them.

Meridian Realtime

Real-time ops dashboard · Node + WebSocket · 2024–2026

The situation

An operations company ran its business on a dashboard that polled for updates every thirty seconds — slow to reflect reality, and heavy on the server every time it refreshed. As the business grew, the polling model strained, and the team wanted genuinely live data without the page stuttering.

What we did

We rebuilt the backend in TypeScript on Node with a WebSocket layer, so updates are pushed the instant they happen rather than polled for. CPU-heavy report generation was moved off the main thread to worker threads and a queue, so the event loop stays clear under load. Redis-backed presence tracked live connections; Sentry and event-loop monitoring went in from day one.

The outcome

The dashboard now updates live, with p95 latency at 88 ms and WebSocket round-trips around 30 ms. It holds 300-plus concurrent connections on a single modest server because the event loop is never blocked. Server load dropped sharply once the thirty-second poll was gone, and the team trusts what they see on screen.

More about Meridian Realtime →

Stratos API

Multi-tenant SaaS API · NestJS · 2023–2025

The situation

A B2B SaaS had an Express API built fast by a small team and grown well past what an unstructured codebase could carry. With no type safety and no consistent shape, every engineer organised code differently, every change was a gamble, and onboarding a new developer took weeks.

What we did

We migrated the API to NestJS with TypeScript in strict mode, one major step at a time with tests passing throughout — no big-bang rewrite. Modules and dependency injection gave the codebase a single, consistent shape. We added a proper test suite, fixed the N+1 queries the old code had hidden, and built multi-tenant scoping in cleanly.

The outcome

p95 latency settled at 96 ms, test coverage reached 90% on critical paths, and the TypeScript compiler runs clean in strict mode. New engineers now onboard in days rather than weeks, because every part of the codebase looks the same. The team ships features without the fear that used to come with every change.

More about Stratos API →

For agencies & product teams

The Node.js engineering team behind the agency.

Roughly 35% of our Node.js work is built for other agencies, product teams, and consultancies — under their brand, against their clients' deadlines. Three partnership models, all NDA-protected, with senior Node engineers working in time zones overlapping the UK, EU, and US workday.

01 · Partnership model

White-label Node.js development

Your brand. Our engineers. We never appear in front of your client — all communication, deliverables, and code go out under your name. The standard model for agencies that win Node.js projects but do not want to hire in-house Node engineering.

NDA & sub-contract in place before any work begins
Code and deliverables shipped under your brand
Joint Slack / email channels with your team only
You stay client-facing; we stay implementation-facing

Used by: digital agencies, product teams, consultancies

02 · Partnership model

Agency-of-record & dedicated Node pod

A pod of senior Node.js engineers and a project lead working as your in-house Node capacity — full-time or fractional, month-to-month or annual. The choice when Node is core to your service mix and hiring in-house is slower or more expensive than partnering.

Dedicated pod: 2 to 6 engineers + lead, scaled to your roadmap
Direct integration into your project tools (Jira, Linear, ClickUp, Asana)
Monthly capacity commitment; retainer or rolling SoW
Code ownership transferred to your repositories

Used by: full-service agencies, SaaS product teams

03 · Partnership model

Capacity overflow & sprint-by-sprint

When your in-house Node team is full and the next project cannot wait. Sprint-by-sprint engagement, no commitment beyond the current two-week sprint, ready to pick up scoped work within 5 to 7 business days from green-light.

Two-week minimum sprint, rolling renewal
Scoped fixed-price work — feature build, migration, performance pass
Fast spin-up: 5 to 7 business days from signed SoW
No long-term commitment; ramp up or down per sprint

Used by: agencies with seasonal Node demand spikes

NDA-protectedStandard NDA, sub-contract, and IP transfer in place before any work begins.

Time-zone overlapWorking hours overlap with UK mornings, the EU workday, and US afternoons every business day.

Single point of contactNamed project lead on every engagement. No agency-side account churn.

Your repos, your codeCode ownership transfers cleanly. We work in your Git, your hosting, your tooling.

Already running an agency or product team? Explore our white-label terms Start a partner conversation

From the journal

Cheap Node shops, structure-free JavaScript, and untyped rapid builds vs Node done properly.

Three routes most product teams consider before they hire a real Node.js engineering team. Each makes sense for someone. None hold up under real concurrency the way a properly built Node app does.

Cheap Node shop

Tutorial-grade Node, the event loop blocked
Plain JavaScript · no type safety
p95 over 1 second under modest load
No observability · bugs found by customers
Cheap up-front · expensive to inherit and fix

Structure-free JavaScript

No framework discipline, no agreed shape
Every engineer organises code differently
A deep, unaudited npm dependency tree
Onboarding a new developer takes weeks
By year two, hard to change and hard to trust

Custom Node.js at Dream Steps

TypeScript strict · typed end to end
Event loop kept clear · p95 under 200ms
85%+ test coverage · OWASP audited
Sentry + event-loop monitoring · observability built in
Structure chosen deliberately — a team can ship on it

Cheap Node is the most expensive Node.

The savings show up in month one. The cost shows up when the event loop blocks under real traffic, when an untyped refactor breaks something nobody could see coming, when a deep npm dependency carries a vulnerability nobody audited, and when the rewrite finally happens 18 months later. Every cheap Node build we have inherited has cost the client more in rebuild than custom would have first time round.

JavaScript without structure is technical debt with extra steps.

Node and npm impose no structure, which means a team without the discipline to impose its own ends up with a codebase that is shaped differently in every file. TypeScript, a deliberate framework choice, and agreed conventions are the cheapest engineering investment a Node team can make — and the difference between a codebase a new engineer joins in days and one they fight for weeks.

A custom Node build does more, scales further, and the team can ship on it.

It costs more up front because that is what it costs to keep the event loop clear, type the codebase end to end, choose the structure deliberately, and build in observability and security from day one rather than retrofit them. Three years in, the maths favours it on every axis we measure — engineering velocity, p95 latency, security posture, hire-ability, total cost of ownership.

— The honest read

Build the Node.js app that fits the team in three years.

Request a Node.js engagement

Common questions

Questions Node.js buyers actually ask.

Fourteen of the most common WordPress questions, answered straight. If yours is not below, send it and we will reply with a real answer — not a sales pitch.

Why choose Dream Steps for Node.js development?

We have shipped 1,000+ Node.js applications since 2015 across APIs, real-time apps, microservices, and full-stack JavaScript products. Our 40-person team of senior Node engineers, designers, and project leads in Noida, India works in time zones overlapping the UK, EU, and US workday. We hold every Node build to four hard targets: p95 API latency under 200 ms, 85%+ test coverage on critical paths, a clean TypeScript strict check, and an OWASP Top 10 audit passing before launch. We write Node in TypeScript by default and choose the framework deliberately, because Node itself will not impose structure for you.

Can you white-label Node.js development for our agency?

Yes — roughly 35% of our Node.js work is built for other agencies and consultancies under NDA. Three partnership models: white-label (your brand, our engineers, fully invisible), agency-of-record (a dedicated Node pod working as your in-house capacity), and capacity overflow (sprint-by-sprint engagement when your in-house team is full). Code ownership transfers to your repositories. Time zones overlap with the UK, EU, and US workday, and we run inside your tooling — Slack, Jira, Linear, ClickUp, Asana — as standard.

Where is your Node.js team based?

Our entire Node.js engineering team is based in Noida, India — 40 people in our iThum Tower B office, founded in 2015. We work with product teams and agencies across the UK, US, Ireland, Australia, the UAE, Germany, and the Netherlands. Working hours overlap with UK mornings, the full EU workday, and US afternoons. For agency partners we run in their tooling — Slack, Jira, Linear, ClickUp, Asana — as standard.

Should I use Node.js or Python for my backend?

Node.js for real-time and I/O-bound workloads, for JavaScript-native teams, and when you want one language across the frontend and backend with shared types. Python for business and CRUD-shaped applications, and — decisively — for anything with AI or serious data work in its present or near future. For a large share of ordinary product backends either is a good choice, and the team’s existing strength should win. We build both and tell clients honestly which one fits the workload and the team.

How much does a custom Node.js build cost?

Custom Node.js builds range from focused APIs and microservices through to real-time applications and full-stack JavaScript products. The right scope drivers are the number of features, the user roles, third-party integrations, whether real-time concurrency is involved, and the team’s Node maturity. We scope every engagement against the specific brief, are competitive with established engineering rates internationally, and are honest about which features can wait until phase two.

How long does a Node.js build take?

A typical Node.js API for a separate frontend takes 6 to 12 weeks. A full-stack MERN or MEAN application takes 10 to 16 weeks. A real-time application with WebSocket infrastructure takes 10 to 16 weeks depending on the concurrency requirements. A NestJS enterprise backend takes 12 to 20 weeks. We work in two-week sprints with weekly demos and a deployable staging environment from sprint one.

Will my Node.js app be fast?

Yes — every Node.js app we ship hits p95 API latency under 200 ms on real production traffic, event-loop lag under 50 ms so no request is starved, query count under 10 per read request, and a cache hit ratio above 80% on cacheable endpoints. We achieve this by keeping CPU-heavy work off the main thread, writing async to run concurrently, eliminating N+1 queries, caching with Redis, offloading slow work to a queue, and scaling across CPU cores. Performance is part of the build, not an afterthought.

Do you build with TypeScript?

Yes — every Node.js build we ship is written in TypeScript and checked with the compiler in strict mode on every CI run. We treat a type error as a build failure. For full-stack JavaScript projects we share types between the backend and the frontend, so a change to an API shape is caught at compile time across the whole stack. Typed JavaScript is what makes a Node codebase safe to refactor and safe to grow, and a serious backend should not be written any other way.

Which Node.js framework do you build with — Express, Fastify, or NestJS?

All three, chosen to fit the project. Express for small services and prototypes where minimalism and ubiquity help. Fastify where performance and schema-based validation matter and the team still wants a light framework. NestJS for larger applications, bigger teams, and long-lived products that need a strong, consistent structure. The framework choice is one of the architecture decisions we make deliberately at the start — because Node will not make it for you — and we recommend based on team size and the project’s lifespan.

Do you build the MERN and MEAN stacks?

Yes. MERN (MongoDB, Express, React, Node) and MEAN (MongoDB, Express, Angular, Node) are full-stack JavaScript stacks, and we build both — along with Next.js full-stack applications, which many teams now prefer. The advantage of these stacks is one language across the whole product, with shared types between the backend and the frontend, which is genuinely efficient for a small team. We will also tell you honestly when a different database than MongoDB suits your data better; the stack acronym should not override the right data model.

Can you build real-time applications with Node.js?

Yes — real-time is where Node.js is genuinely at its best. Live dashboards, chat, collaboration, notifications, live commerce: we build these with WebSocket and Socket.io, or server-sent events where they fit, with proper presence and connection management. The engineering that matters in real-time Node is keeping the event loop clear under many open connections, scaling connections across processes with a Redis adapter, and handling reconnection cleanly. We have shipped real-time Node apps holding thousands of concurrent connections on modest infrastructure.

Will you maintain the Node.js app after launch?

Yes. We offer monthly Node.js maintenance retainers covering security patches, Node version upgrades, dependency updates with npm audit, event-loop and memory monitoring, error tracking with Sentry, and a fixed allocation of engineering hours per month. Node’s deep dependency tree changes constantly and needs active attention, and a long-running Node process needs its memory and event loop watched. For teams without a dedicated Node engineer in-house, this is how the app stays healthy, fast, and secure past month one.

Can you take over or upgrade an existing Node.js codebase?

Yes. We regularly take over Node.js codebases — adding the types, tests, structure, and observability they were missing — and run upgrades: plain JavaScript to TypeScript, old callback or promise-chain code to async/await, and Express to NestJS where the structure is needed. The process is one major step at a time, with tests passing at each step and no big-bang rewrites. We also handle Node version upgrades and dependency modernisation, which on a neglected Node project is often the most urgent work of all.

What stack do you ship for a typical Node.js application?

Our default 2026 Node.js stack: Node.js with TypeScript in strict mode; NestJS for larger applications, or Express or Fastify for focused services; PostgreSQL with proper indexing for most products, or MongoDB where a document model genuinely fits; Redis for caching, sessions, and as the queue backend; BullMQ for background jobs; Socket.io for real-time; Vitest or Jest for tests; Sentry for production error tracking; and structured logging with event-loop monitoring. We adjust to the team and requirements, but that is what we recommend by default.

Ready when you are

Build a Node.js app your team can run for a decade.

Tell us about the application, the team, the integrations, and the concurrency shape. We will come back with a written brief, a realistic build cost, and a clear set of performance, type-safety, security, and test-coverage targets we will hold ourselves to.

Request a discovery call See more of our work

What to expect

A 30-minute conversation about your business, the editorial team that will run the site, and where you want to be in three years. No slide deck, no pitch.

You walk away with

A written brief naming the build scope, the performance and accessibility targets we will hold to, the timeline, and a realistic build cost.

Node.js apps that handle real concurrency — and a team can actually ship on for a decade.

Node is fast — until something blocks the event loop.

JavaScript everywhere only pays if it is TypeScript everywhere.

Node gives you everything and decides nothing.

Node.js APIs & microservices

Real-time applications

Full-stack JavaScript (MERN, MEAN, Next)

NestJS enterprise backends

Express & Fastify services

Performance audits & migrations

Node migrations & upgrades

Performance audits & ongoing engineering

Security audits & compliance

p95 under 200ms · event-loop lag under 50ms

85%+ tests · TypeScript strict · Vitest / Jest

OWASP Top 10 passing · dependency tree clean

Sentry · structured logs · 99.9% uptime SLA

Brief and API spec

Architecture and data modelling

Custom Node.js build

Security and load testing

Launch, monitor, maintain

Need a Node.js app that handles real concurrency without stuttering?

REST & GraphQL backends

Live, connected experiences

MERN, MEAN & Next.js products

Structured, long-lived backends

White-label Node.js development

Agency-of-record & dedicated Node pod

Capacity overflow & sprint-by-sprint

Node.js vs Python — which backend should you build on?

Why is your Node.js app slow? The event loop, blocking code, and the seven fixes

Express vs NestJS — which Node.js framework should you choose?

Cheap Node is the most expensive Node.

JavaScript without structure is technical debt with extra steps.

A custom Node build does more, scales further, and the team can ship on it.

Build the Node.js app that fits the team in three years.

Build a Node.js app your team can run for a decade.