Build your backend with our senior NestJS team based in Krakow, Poland. We pair modular, TypeScript-first NestJS APIs with React and Next.js frontends - the same combination behind Speeki's migration to a backend now serving 100+ enterprise clients.
NestJS is a TypeScript-first Node.js framework with an architecture inspired by Angular - modules, decorators, and dependency injection built in from the start. It gives backend teams a structured, opinionated foundation instead of assembling one from scratch on top of a minimal framework like Express.
NestJS has grown to roughly 76,000 GitHub stars and clears over 13 million weekly npm downloads for its core package, with Enlyft tracking 42,269 companies now running it in production.
At Dev and Deliver, we build NestJS APIs with Prisma or TypeORM for SQL databases, Mongoose for MongoDB, and native support for GraphQL, WebSockets, and microservices when a project needs to scale past a single service. That structure is what powers backends like Speeki's - migrated from a Java and PHP monolith to Node.js microservices, now serving 100+ enterprise clients under continuous ISO audit.
Whether you're starting a new product or replacing an ageing backend, NestJS gives your team a codebase that stays testable and maintainable as it grows - not just fast to write on day one.
The benefits of choosing NestJS for your project
NestJS fits both simple and highly complex projects alike.
From a simple REST API to a complex, enterprise-level system, NestJS adapts to the scope of the project rather than the other way around.
Looking for NestJS developers? Let's talk about your backend
From a single API to a full microservices architecture, our NestJS team can jump in at any stage - planning, migration, or ongoing support.
We design modular NestJS applications from the ground up - clear module boundaries, dependency injection, and decorators used the way the framework intends, not bolted on after the fact.
We connect NestJS to SQL databases via Prisma or TypeORM, or to MongoDB via Mongoose, choosing the right tool for your data model rather than forcing one default everywhere.
We build REST controllers and, where a project needs it, GraphQL resolvers through NestJS's native GraphQL module - so your API shape follows what your clients actually need.
Every layer of the application is strongly typed, from database models to controllers, cutting down on runtime errors and making the codebase easier to onboard new engineers into.
We use NestJS's native microservices support (TCP, Redis, RabbitMQ, Kafka transporters) to split a growing system into independently deployable services - the same approach behind Speeki's migration to a Node.js microservices backend now serving 100+ enterprise clients.
Dependency injection and a modular architecture make unit and integration testing straightforward. We build test suites with Jest that isolate services and controllers without complex mocking setups.
We implement guards, interceptors, and strategies (Passport, JWT) to secure your API, with role-based access control designed around how your product actually needs to restrict data.
We migrate existing Node.js or Express backends to NestJS incrementally, and maintain and extend NestJS systems already in production without disrupting how your team ships.
Where and how we put NestJS to work in production - from Speeki's migration to a Node.js microservices backend now serving 100+ enterprise clients, to Hemfrid's customer and employee apps for Sweden's largest home-services company - the pattern is consistent: NestJS gives teams structure, type safety, and one team accountable for the full stack. It's not an experiment. It's how we build by default.
Straight talk on architecture
We build long-term relationships, not one-off projects. You get transparency, honest technical advice, and a team that will tell you when a modular monolith is a better fit than microservices for your stage.
One team owns the whole module
Our NestJS expertise spans the full chain - from module and database design on the backend to React and Next.js frontends. No handoffs, no gaps, no integration surprises.
Shipped through real migrations
Our engineers have shipped NestJS in enterprise compliance platforms and fast-moving product migrations, including Speeki and Eatzon. That range shows up in every architecture decision.
Testable by design
Type-safe code end to end, automated tests on services and controllers, and dependency-injection-friendly test setups are part of how we ship, not features we add later when something breaks.
NestJS projects get a team built around the backend's real shape: a backend engineer designing modules, database schema, and API contracts, a frontend engineer when a React or Next.js client is part of the picture, a QA engineer covering functionality end to end, and a project manager holding it all together.
Delivery runs in Agile sprints with clear communication and regular check-ins, so your backend keeps evolving without disrupting what's already in production.
Get started with NestJS - build your backend with a team that knows the full stack
Ready to build or modernise your backend? Whether you're starting a new API, adding microservices to an existing system, or migrating away from a legacy stack like Speeki did, we'll help you design a NestJS architecture that's type-safe, modular, and built to last.
NestJS is a TypeScript-first Node.js framework inspired by Angular's architecture, providing a structured, modular approach to building backend applications. Unlike Express, which is minimal and unopinionated, NestJS comes with dependency injection, a module system, and built-in support for testing - making it better suited for large, maintainable codebases.
Kickstart your new project with us in just 1 step!
