ANode.jsdevelopment company for APIs that hold up under real traffic.

We design and build the back end behind your web and mobile apps: APIs, real-time features, integrations and the services that process your data. Typed, tested and ready for growth.

Discuss your back end

Your back end shouldn't be the reason a launch slips.

Node.js runs one language across your front end and back end, handles many open connections well and makes real-time features natural. It also makes it easy to build a fragile API quickly. We structure Node.js services so they stay readable, testable and fast as traffic and the team grow.

Where Node.js back ends struggle

A blocked event loop slows everyone

One heavy calculation or synchronous call in the wrong place stalls every request on that server.

An unstructured codebase

Express apps without clear modules turn into route files nobody wants to touch.

Real-time features break at scale

Chat, live dashboards and notifications work in testing, then drop connections in production.

A monolith that's hard to split

Every deploy ships everything, and one bug can take down the whole API.

Weak error handling and logging

Unhandled promise rejections crash processes, and the logs don't explain why.

Dependency risk

Hundreds of npm packages, some unmaintained, and nobody tracking their updates.

Why teams choose Node.js

Node.js is a strong fit for APIs, real-time features and products with a JavaScript front end. Where it isn't, we'll tell you.

One language across the stack

JavaScript and TypeScript on both sides
Shared types and validation
Simpler hiring and code review

Built for concurrency

Handles many open connections efficiently
Suits APIs, chat and streaming
Low overhead per request

Real-time by design

WebSockets for live updates
Event-driven architecture
Notifications without polling

Fast to iterate

A large package ecosystem
Prototypes that can grow into products
Fits serverless with AWS Lambda

Signs your back end needs Node.js expertise

If two or more of these sound familiar, it's time for experienced hands on the server side.

Response times keep creeping up

Endpoints that used to be fast now time out under normal load.

Front end developers own the API by default

JavaScript developers keep the back end running, but nobody really designed it.

Users expect live updates

Chat, tracking or dashboards need real-time data, and polling no longer works.

Integrations keep breaking

Payment, CRM and partner APIs fail silently and data drifts out of sync.

Deploys are scary

No tests, no staging and no rollback plan, so releases happen late at night.

You're planning microservices

The monolith limits you, and you want to split it without breaking production.

What we do

Node.js web development services

API development

REST APIs in NestJS or Express with clear contracts, validation and documentation.

Real-time features

Chat, live tracking, notifications and dashboards over WebSockets.

Microservices

Monoliths split into services that talk through queues like RabbitMQ and deploy independently.

Integrations

Payments, CRMs, ERPs and partner APIs with retries, logging and monitoring.

Serverless and cloud

AWS Lambda functions and containerized services on AWS with Docker and Kubernetes.

Data layer

PostgreSQL, MySQL and MongoDB schemas, queries and migrations tuned for your load.

Performance and scaling

Profiling, caching, background queues for heavy work and load tests before traffic arrives.

Upgrades and rescue

Old Node.js versions upgraded, JavaScript moved to TypeScript and risky code cleaned up.

Who is this for

For products that run on JavaScript

Startups

You need an API behind your web and mobile apps, built to grow with your users.

Product companies

Your Node.js back end needs more capacity, more structure or a path to microservices.

SMBs

You need integrations and internal APIs that keep your operations and data in sync.

Agencies

Your clients need back ends, and you need a reliable Node.js team behind your front end work.

How we build Node.js back ends

Requirements and review

We learn what the API serves, who uses it and how much traffic it carries, and review any existing code.

Architecture

Modules or services, the data model, API contracts and how real-time and background work will run.

Build and test

Features ship in sprints with automated tests, code review and API documentation.

Deploy and monitor

CI/CD, staging and production environments, with logging and monitoring in place before launch.

Scale and maintain

We tune performance, update dependencies and evolve the architecture as usage grows.

How we work

Choose how to start

Node.js project

Fixed scope, defined in a 2-week Discovery Sprint

Fixed price, agreed after discovery.

For a new API or a well-defined piece of back end work.

Architecture and API design

Development and automated tests

CI/CD and deployment setup

API documentation

Hand-over to your team

Scope your project

Node.js engineers

most popular

Engineers in your team or as a dedicated team

Monthly, per engineer. Scale up or down.

For products with ongoing back end work.

Senior Node.js and TypeScript engineers

You interview and choose

Your repositories and process

QA and DevOps on request

Start in about two weeks

Add Node.js engineers

Products we've engineered

Data MANAGEMENT & payroll

AI Payroll Platform (NDA)

Europe

An AI-powered payroll validation platform that extracts data from salary slips, verifies payroll calculations, and automates reporting and approval workflows for HR and finance teams

Before

→

after

↓

Manual payroll validation

↑

17% fewer salary calculation errors

↓

Complex PDF extraction

↑

AI-powered PDF data extraction

↓

Manual approval workflows

↑

Automated payroll validation and reporting workflows

↓

Limited processing scalability

↑

Scalable platform for payroll processing

AI Commerce PlatformE

QLode

USA

Europe

An AI-powered fashion commerce platform that helps retailers deliver personalized shopping experiences through virtual styling, AI recommendations, image search, and intelligent product discovery.

Before

→

after

↓

AI search didn't scale

↑

AI-based recommendation engine developed

↓

Scalable infrastructure needed

↑

Image & text search implemented

↓

Complex retailer integrations

↑

Multi-retailer integration architecture built

↓

Product discovery wasn't production-ready

↑

High-performance backend for AI-driven flows

Manufacturing

Incident management system for auto parts manufacturer

Read the case study →

Make the most of the experienced team

We are a global team of

creative

and

strategic thinkers

who specialize in building custom digital products

from scratch. Our main goal is to

deliver high-quality solutions

that meet our clients' needs.

We are a global team of

creative

and

strategic thinkers

who specialize

in building custom digital products

from scratch. Our main goal is to

deliver high-quality solutions

that

meet our clients' needs.

Learn more

85%

recurring customers

12M

the biggest fundraising round by one startup

X3 MRR

growth of partner's business in 5 mos

2 weeks

for project start

5+ years

av. partnership duration with SMBs and product companies

Why Gilzor

We're a JavaScript development company with deep back end experience. Our Node.js engineers work next to React, mobile and QA specialists, so the API is built for the apps that actually use it.

What we bring

Fast start

Node.js engineers can start in about two weeks.

Full product context

React, React Native and QA in the same team as your back end.

Delivery record

70+ products launched, 98% delivered on time.

Returning clients

85% of our customers come back with new work.

Infrastructure skills

AWS, Docker, Kubernetes, NGINX and CI/CD in-house.

What makes us different

TypeScript by default

Typed back ends that are safer to change.

Observability built in

Logs, metrics and alerts set up before launch.

Honest stack advice

If Python fits a workload better, we'll say so. We build with both.

Documented APIs

Contracts your front end and partners can rely on.

Overlap with US hours

Our engineers in Europe overlap with part of the US working day.

What our clients
frequently ask

Why choose Node.js for our back end?

It fits APIs, real-time features and products with a JavaScript or TypeScript front end well, since one language runs across the stack. For data science or heavy CPU-bound processing, Python can be a better choice, and we work with both.

NestJS or Express?

NestJS gives larger codebases a clear structure, modules and dependency injection out of the box. Express is lighter and fits small services or existing apps. We choose based on team size, scope and what you already run.

Can you build real-time features?

Yes. We build chat, live tracking, notifications and dashboards over WebSockets, and design them to scale beyond a single server.

Do you move monoliths to microservices?

When it pays off, yes. We usually split out one service at a time, with queues like RabbitMQ between them, so production keeps running. Sometimes a well-structured monolith is the better answer, and we'll say so.

Can you take over an existing Node.js app?

Yes. We review the code, dependencies and infrastructure, fix the riskiest parts first, then continue development.

How is Node.js development priced?

Monthly per engineer for ongoing team work, or a fixed price after discovery for defined projects. Share your needs and we'll send an estimate.

No sales pitch

Tell us about your back end

Describe your product, your API and its traffic, or what's breaking. We'll come back with an approach and an estimate. If we're not the right fit, we'll say so.

Something went wrong. Please try again, or email us at contacts@gilzor.com.

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Node.js Development