Backend & API development in Node

We build fast, scalable backends using Node.js and NestJS. Whether it’s a web app, mobile app, CRM, ERP integration, or any system that needs solid backend functionality, we deliver clean architecture and high-performance APIs

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01Our backend & API development offer

We dev and deliver backends quickly, reliably, and with an eye toward future scalability. From lightweight APIs, high-load systems, or real time data streams - we never compromise on performance, nor seamless integration. Our expertise spans across GraphQL APIs, RESTful APIs, and CMS layers, always prioritizing maintainability over complexity.

Thinking of switching from PHP, Java, or Kotlin to Node.js? We make the migration easy and cost-effective, refactoring where necessary to reduce pain points. Monolith or microservices? This choice comes down to what suits your needs - we design scalability and future-proof systems.

A backend that doesn't work under heavy load isn’t an option. With Kubernetes and Docker, we can utilise an autoscaling infrastructure, so traffic spikes will never slow you down. Plus, with robust CI/CD pipelines, deployments will be seamless and your team will be focused on building, not troubleshooting.

Mobile & Web APIs development

API does more than just connecting between two systems; it manages the performance, scale, and integration of your application into the outside world. We design, develop and deploy mobile and web APIs that earn trust with their reliability, effectiveness, and ability to withstand any demands placed upon them by your project. Whether you need a lightweight, high-speed solution or a robust, high-load system built for scalability and performance, we tailor APIs to fit your exact requirements. Developing for IoT? No problem - we ensure seamless real-time data exchange and reliable device communication. Each API is equipped with well-structured-to-the-point documentation that banishes the need for your developers to waste time deciphering any cryptic instructions. Aside from things like that, we also coordinate with frontend developers, which is why our backend ones will truly know the data structures, response times, and types of integrations your frontend guys will be needing. Therefore, less blocking and higher development speeds - solid stuff on the backend. 

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GraphQL and RESTful APIs development

GraphQL or REST? We do it all and we do it well. Whether you're creating a high-performing API using Apollo Federation or a tidy RESTful service, all of our solutions are designed to scale with your architecture. We prioritize performance in all our API solutions, ensuring optimal speed and efficiency. Need a CMS layer to manage the data? No problem here. We'll integrate one or build one where data is organized and accessible. We keep the three parameters: performance, maintainability, and ease of integration with frontend or third-party systems in focus for every API we make. We don't go for clever solutions that over-engineer, we're not here for unnecessary complexity-just APIs that work the way they should and are built for real-world use.

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Migration to Node

Legacy systems can slow you down - outdated code, scaling issues, and maintenance headaches. If you’re running PHP-based frameworks like Laravel, Symfony or Yii and want to transition to a modern, high-performance Node.js architecture, we can make that happen. Some of our developers have previously worked with PHP, which allows us to make seamless and predictable migrations to Node. But it’s not just about PHP; whether you’re moving from Java, Kotlin, or other existing backend base which now seems incompatible, we ensure a structured, minimal-risk migration process.  We analyze your existing architecture; refactor it as appropriate; while we will also recreate components, making sure that the re-creating costs would be minimal without too much disruption. Every decision is based on performance, scalability, and maintainability. The result? Clean, faster, more flexible back-ends, easier to maintain and integrate with modern technologies. All the benefits from using Node without suffering the pains of a bad migration.

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Microservices / Monoliths architecture

The decision is not about the trends of monolithic versus microservices. It's about what actually works for your business. We built both, and we learned when each one makes sense. Want a monolith that is solid and well-structured? We can create one that is scalable and maintainable instead of a horrible web of dependencies. Thinking about the transition to microservices? We take a thoughtfully strategic approach to breaking the system apart and making sure that every service remains independent yet smoothly works together with the others. The decision is really not just a technical one; it's based on the scale of your application, the performance demands it has, and its future growth. Some projects can thrive on a single code base, while some have the need for the flexibility that a microservice architecture can give them. We analyze your architecture, identify the bottlenecks, and implement a structure to optimize performance without imposing unnecessary complexity. Be it simplicity or large scaling with service-based solutions, we build the backends that fit, not impose the right solution on your product.

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Scalable backends

A backend that crumbles under load isn’t an option. We design scalable architectures that handle traffic spikes, heavy data processing, and unpredictable workloads without breaking a sweat. Our developers and DevOps engineers work together to configure auto-scaling environments, leveraging load balancers, Kubernetes (K8s), and containerized deployments with Docker. Need horizontal scaling? We optimize node distribution. Require fine-tuned resource allocation? We configure it down to the last detail. Every decision is made with performance, reliability, and cost-efficiency in mind—no unnecessary over-engineering, no bloated infrastructure. Whether you’re running a high-traffic e-commerce platform, a data-heavy SaaS application, or an API serving thousands of requests per second, we make sure your backend scales smoothly. Resilient, responsive, and built to grow with your business.

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Devops and deployments

A slow and unreliable deployment pipeline can halt any development. We come in to smoothen out inefficiencies and bottlenecks and stabilize and speed up your infrastructure. CI/CD pipeline optimization? Nearby environments just need an upgrade? Deployments to Cloud appear to be more of guesswork than a real process? We keep everything working! Local environments for testing and collaboration have to be dynamic? We can set it up, so every developer comes with a consistent and up-to-date setup. Our DevOps engineers don't just keep your app running; they keep it stable, predictable, and ready to scale. No more deployment headaches! No more fighting fires! Just a streamlined workflow allowing your team to build instead of fixing.

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02Backend development process

Analysis

discovery / conceptualization / choosing software type / scope of the project determination

Architecture design

planning / architecture analysis / choosing pattern / decomposition / documentation

Database setup & deployment

server-side software build & development / functionality tests / database development database and APIs setup

Quality assurance

QA / Integration tests/ Stress tests / Security tests

Deployment & support

cloud or on-premise deployment / integration with the client-end

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Analysis

Architecture design

Database & development & integration

Quality assurance

Deployment / CI & CD / support

The most important aspect of a successful project is the analysis phase wherein everything is given its first structure. It begins before one writes a single line of code; it enables immersion into what your business idea is all about and what problem you are trying to solve. Important questions are asked: what the goals are, who will use the system, and what features are the most crucial to success in the project- it is a collaborative process, one in which we listen to your vision and correlate that with our own experience in technology and development.

At this stage, we will ascertain what kind of software will be best suited for your needs. Be it a web app, mobile solution, or even custom enterprise software, we will walk with you all through the different options available to you in your quest for the right road ahead. We examine scope, number of users, and long-term growth potential to ensure that any solution we propose can grow with your business. It is not merely a function, but it future-proofs the system from day one against obsolescence. At the conclusion of this phase, we will have established a clear roadmap outlining the core features of the project, the technical requirements, and the overall strategy for bringing it to life.

03Our latest backend / API projects

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Expertise in Node.js

Customization and Flexibility

Some developers work with Node.js—we specialize in it. Years of experience have taught us that writing JavaScript on the server is the easy part—building high-performance, scalable, and resilient applications is where true expertise comes in. The systems that we architected were able to handle thousands of requests per second without a sweat, optimize code to shave off precious milliseconds, and make APIs that developers love to work with. From using event-driven architecture for real-time applications to fine-tuning database queries to handle massive datasets, we know the subtle differences that make an average Node.js backend stand out from an extraordinary one. And we don’t just rely on what worked yesterday—Node.js evolves fast, and we stay ahead by continuously refining our approach, adopting the best tools, and applying the latest best practices.

We know about the Node.js ecosystem in and out. It includes NestJS for structured backend development, Express for lightweight APIs, Prisma for modern database management, and the whole arsenal of libraries that help us in building efficiently without unnecessary bloat. But we do not only pick tools from a list; every project is governed by its own demands, and we make decisions based on performance, maintainability, and long-term scalability. Our collective experience in cross-platform development ensures that the applications we build run on different environments like web apps, mobile backends, or IoT systems without breaking a sweat. Performance-obsessed – profiling, caching, and optimizing and squeezing every last ounce of efficiency out of our systems. That is the difference between backend that works and the one that works smoothly under heavy load.

No two projects are alike, and we build backends that are custom-made, adaptable, and engineered to fit instead of being forced into a one-size-fits-all-type contraption. To us, business logic is no generic issue, and so are our solutions. Whether what you need is a fine-tuned API, a backend that integrates with existing systems, or an architecture that flexibly works with your business to grow, we treat every project afresh. In iterations, we are getting things done with refinements and adjustments as requirements emerge; delivering what works is not enough; it has to work towards your own goals. For us, the agile process is not just buzzwords; it is a way of working—sensitive, efficient, and improving all the time.

Systems do not just exist in isolation, and neither shall yours. We know how to make things work together smoothly-whether it is interfacing with third-party services, synchronization of information between platforms, or modernization of your outdated infrastructure with no disruption. Real-time notification system? Multi-tenant platform? Backend that just scales? Designing with the future in mind, we will make sure that your application can grow without unwarranted rewrites down the road. And though backend development will always be our bread and butter, we never forget about the end-user—that a great system is only powerful when it works perfectly for them on the front end.

04FAQ

What types of companies do we usually work with?

Are the backend development consultations free?

What’s the standard length of the backend project?

What team works on a backend website development?

What happens if I am not satisfied at any of the steps of the API development?

How much does a backend development cost?

Is Node good for backend? Is NestJS a good Node framework?

What is a back-end API?

05Recent posts

06Our clients

They’ve already trusted us.

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07Testimonials

Dev and Deliver have become our trusted partner during the development of recruitment platform GigPlug! We have really valued their technology insight, expertise and professionalism during the tech build process, and they always exceed expectations to help our business. We also enjoy working with Michal, our Dev and Deliver PM!

Elaine Relihan, GigPlug / Co-Founder and CEO

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Node JS backend developers from Kraków, Poland

Dev and Deliver

sp. z o.o. sp. k.

Address

Józefitów 8

30-039 Cracow, Poland

VAT EU

PL9452214307

Regon

368739409

KRS

94552994