Node.js development for
SaaS backends that survive scale.
Node.js has been our primary backend since 2017. We build multi-tenant SaaS platforms, REST APIs feeding web and mobile clients, and real-time features over WebSockets. Node's single-threaded event loop is what lets one modest server hold thousands of open connections without falling over.
Node.js for high-concurrency, API-first applications
Node's event-driven architecture handles thousands of simultaneous connections efficiently. For SaaS backends and real-time features, that concurrency model matters from day one.
Multi-tenant SaaS Backends
Tenant isolation, subscription billing, team management, and API layers. i-mve, the removals-industry platform we built on Node.js, runs 510 companies and has processed over 314,500 jobs on one codebase.
REST API Development
High-performance APIs connecting frontends, mobile apps, and third-party services. Documented, versioned, and built to survive your first 10,000 users without a rewrite.
Real-Time Applications
Live dashboards, notifications, chat, and collaboration features via WebSockets and Socket.io. Node's event-driven model makes real-time efficient at any scale.
Microservices
Independently deployable services replacing monolithic architectures. We've migrated legacy systems to microservices and built greenfield architectures for enterprise clients.
Not every project needs Node.js. Here's when it's the right call.
Node excels at I/O-bound, high-concurrency workloads. For CPU-heavy computation it's not the best choice, but for most SaaS backends and API layers, it's hard to beat.
Concurrency without the overhead
Node handles thousands of simultaneous connections on a single thread. For SaaS platforms expecting rapid growth, this concurrency model matters from the first day in production.
JavaScript across the full stack
When your frontend is React or Angular, Node on the backend means one language across the stack. Shared validation logic, less context-switching, unified tooling.
npm has 2 million packages
Authentication, payments, PDF generation, email, queuing: there's a battle-tested package for each. We don't reinvent wheels. We pick the right one and integrate it properly.
TypeScript as standard
We default to TypeScript on all Node projects. Typed APIs, typed database queries, typed middleware: bugs caught at compile time, not at 2am in production.
When should you choose Node.js?
Node excels at I/O-bound, high-concurrency workloads. For CPU-heavy computation, it's not the best choice.
Node.js makes sense when
- You're building an API-driven SaaS backend expecting concurrent users
- Real-time features like live updates or chat are part of the product
- Your frontend is React or Angular and you want one language across the stack
Consider alternatives when
- The workload is CPU-heavy computation rather than I/O-bound
- You're already on PHP/Laravel or .NET with no reason to migrate
- Data science or ML workloads are core, where Python is usually the better fit
What we pair with Node.js
Node.js rarely runs in isolation. Here's the full stack we build around it.
Hire a Node.js Developer
Skip the full build. Get a vetted Node.js developer working inside your existing team, on your stand-ups and your roadmap.
Hire a Node.js Developer →Node.js in production
🇩🇪Rezi24
We designed and built Rezi24 — a GDPR-compliant healthcare SaaS that gives German medical practices an online reception: patients book appointments 24/7, reception teams field fewer calls, and everything runs on German data centres. Website and full multi-tenant web application, from concept to launch.
Read case study →
🇬🇧i-mve
We built i-mve from scratch — an all-in-one SaaS/CRM for UK removals companies covering job management, crew scheduling, automated quoting, invoicing, client contracts, and lead intake from every major UK lead platform. 510 companies use it as their operational backbone today.
Read case study →Built by AI-native engineers, so your Node.js backend is ready for agents and LLM features
We design the API surface, auth, and event model so language-model features and AI agents can consume your backend safely later, rather than bolting them on after. It's how our own products, Tully AI and Mebag, were built.
Typed schemas, scoped tokens, and predictable errors so an AI agent can call your Node.js API without surprises.
Retrieval endpoints and event streams that feed a vector store without a nightly export job.
A managed Node.js layer in front of OpenAI, Anthropic, or Gemini with rate limits, caching, and fallbacks.
Shipped with prompt versioning, evals, and guardrails. See how we build AI →
Common questions about Node.js development
Straight answers on stack fit, working in your codebase, cost, and how we start.
Do you build custom Node.js applications, or can we hire a Node.js developer to join our team?
Both. Most engagements are a fixed-price custom build: we scope it, design it, and ship it. If you already have a team and just need capacity, we also place vetted Node.js developers who work inside your workflow, on your tools and your stand-ups, while we handle employment and payroll.
How much does Node.js development cost?
We work fixed-price, not hourly. You get a fixed number and a fixed timeline before any code is written. The number depends on scope; a focused SaaS MVP backend is a different figure from a multi-integration enterprise platform. See our pricing page for how we structure engagements, or book a call for a real number.
How experienced is your team with Node.js specifically?
Node.js has been our primary backend since 2017: 8+ years and part of 600+ shipped projects. It runs the backends behind i-mve (510 companies, 314,500+ jobs processed) and Rezi24, our GDPR-compliant healthcare SaaS for German medical practices.
Do you use TypeScript with Node.js?
Yes. TypeScript is our default. Typed code catches errors at development time rather than runtime, makes refactoring safe, and is the standard for professional Node.js work at any scale.
Do you work with the current Node.js LTS and modern frameworks?
Yes. Node.js 22 LTS for new projects, with Express, NestJS, or Fastify depending on the shape of the work. Express for APIs where you want full control, NestJS for larger applications where opinionated structure helps, Fastify where raw throughput matters. For existing codebases we work with whatever version is live and recommend upgrades where they add value.
Is Node.js still a good choice in 2026?
For I/O-bound, high-concurrency work such as SaaS backends, REST and real-time APIs, and backends paired with a React or Angular frontend, yes, it is still hard to beat. Where it is not the right fit: CPU-heavy computation, data science and ML workloads (Python is usually better), or a team already productive on .NET or Laravel with no reason to migrate. We will tell you if your project is one of those.
Can you migrate an existing application to Node.js?
Yes. We have migrated PHP, Python, and .NET backends to Node.js. Before recommending migration, we assess whether it is actually the right move; sometimes optimising the existing stack is better value.
What does the process look like?
A 30-minute scoping call, then a fixed-price, fixed-timeline proposal within 48 hours. A focused SaaS MVP backend typically runs 12 to 20 weeks; a full platform with complex business logic and third-party integrations, 20 to 32 weeks.
Do you sign an NDA before we talk details?
Yes. We can have an NDA in place before the first call. Just ask and we will send one over.
Hire Node.js Developers
Need Node.js engineers embedded in your team rather than a full project handoff? Our Node.js Developers join your existing workflow (your tools, your stand-ups, your roadmap) while we handle employment, payroll, and HR. Add one developer or a full team, scale up before a release and back down after, and keep everything they build.
Need a Node.js team for your backend?
We've been building with Node since 2017.
SaaS backend, REST API, real-time platform. Tell us what you're building. We'll give you a straight answer on scope and fit.