Backend Development Services
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Power your product with scalable backend engineering by QueryBlocks
From RESTful APIs to microservices, QueryBlocks builds robust, secure, and scalable backends tailored to your product's growth. We work with modern technologies like Python, Go, Java, and Node to support real-time data, AI, and distributed systems. Trusted by companies like Helpby, You Might Need Work, and La Casa de Ruben, we deliver infrastructure that’s ready for millions of users and built to evolve.
Backend technologies we use
Browse through the cutting edge technologies we use for our backend development services and choose the one that fits your needs and business requirements
Python
Python is one of the most versatile and productive backend languages. At QueryBlocks, we use it to build RESTful APIs, microservices, data pipelines, and machine learning integrations. Whether it's with Django for rapid development or FastAPI for high-performance asynchronous services, Python offers clarity, speed, and scalability for modern backend systems.
Solidity for Smart Contracts
We use Solidity to build and audit secure smart contracts on Ethereum and EVM-compatible chains. From DeFi protocols to NFTs and DAOs, QueryBlocks helps you launch reliable and gas-optimized blockchain solutions with on-chain logic and off-chain integration. We follow best practices for contract architecture, security patterns, and upgradeability.
Node.js
Younger than Java, Node.js is eagerly used both by startups and large enterprises. It is an excellent backend choice for building fast, scalable business applications. As with Java, a lively community makes Node.js resources dependable and up to date with the latest tech standards. One of the biggest advantages of using Node.js as a backend language is the impressive development speed, which can significantly reduce your app’s time-to-market. Node.js apps are also known for their high efficiency, enhanced performance and easy scalability.
Golang
Adored by startups as one of the hippest backend languages, Golang is a great choice for forward-thinking businesses pursuing innovation. Thanks to a number of built-in features, Golang reduces the need to use outside resources and provides outstanding application speed. Well suited for building microservice-based solutions, Golang is a great choice for applications that are expected to grow rapidly and need to be easily scalable. This language is also a great choice for projects that require efficient parallelism as it was specifically designed for multicore computers.
Java
Java is one of the most popular and powerful backend languages, used widely by multi-billion-dollar enterprises around the globe. It’s been used and developed for over 25 years now, which makes it rich in open-source libraries, frameworks, and other community resources. Therefore, it is considered one of the most secure and reliable among backend programming languages, and works equally well in client-side and server-side applications.
Kotlin
Constantly growing in popularity, Kotlin for backend is one of the relatively new programming languages that has managed to gain excellent community support in a short time. Kotlin offers full compatibility with Java and its ecosystem, which means it will work well if you have an existing Java tech stack. At the same time, Kotlin holds the advantage of being more concise and allowing backend developers to write much less code that they would in Java. All in all, Kotlin is known for powerful, scalable server-side applications.
Quick app development
The headless software architecture allows brands to create tailor-made systems composed of third-party microservices loosely connected via API. If you seek unprecedented flexibility, reduced time-to-market, and the possibility of testing various external solutions without impacting the entire infrastructure, our frontend and backend teams can develop a custom headless solution just for you.
Top-notch cybersecurity
Do you need a fast and effective time-to-market strategy? Develop your competitive edge by choosing an experienced Android application development services that will optimise the development process by using Android libraries, frameworks and automated testing. Don’t build common app features from scratch – benefit from a wide selection of pre-built Android app development solutions and focus on creating your unique value proposition.
Targeting multiple platforms
Take advantage of the cross-platform frameworks and SDKs to develop a scalable Android app with reusable code. Choose Flutter, React Native or Kotlin Multi-platform to create a native-like Android solution that can be easily transformed to iOS, desktop or web application. Leverage the power of Kotlin and Java to simplify porting the Android app into multiple operating systems.
Your Telemedicine Solution for Seamless Healthcare Access
Developed during the pandemic to meet the urgent need for remote healthcare, HelpBy bridges patients and doctors through a fully integrated digital clinic experience.
HelpBy offers patients tools to manage their healthcare from anywhere, with features like specialist searches, one-click appointment booking for video or in-office consultations, easy access to their health history, digital prescriptions, and follow-up reminders for treatments. The platform’s built-in video call technology ensures smooth virtual appointments without the need for external apps.
HelpBy offers patients tools to manage their healthcare from anywhere, with features like specialist searches, one-click appointment booking for video or in-office consultations, easy access to their health history, digital prescriptions, and follow-up reminders for treatments. The platform’s built-in video call technology ensures smooth virtual appointments without the need for external apps.
QueryBlocks backend development services
From powerful APIs to scalable distributed systems, QueryBlocks delivers high-performance backend solutions using Python, Go, Java, and more. We help startups and enterprises design, build, and maintain systems that are ready to grow with your business. Whether you're launching a new product or optimizing an existing infrastructure, our backend team is ready to support you.
Custom Backend Development
We build robust, scalable, and secure backend systems tailored to your business needs. Whether it's an MVP or a complex microservices architecture, QueryBlocks provides the engineering power behind modern digital products.
API Development with Python, NestJS, and Go
Our team specializes in high-performance APIs using Python, NestJS, and Go. We design clean, well-documented RESTful and GraphQL APIs that power mobile, web, and enterprise applications with speed and reliability.
Java-Based Enterprise Solutions
We deliver enterprise-grade backend systems using Java and Spring Boot, ideal for applications that demand high security, scalability, and stability. Our engineers help you modernize legacy systems or build new Java-based services from scratch.
Microservices & Modular Architectures
QueryBlocks builds and orchestrates distributed systems with Docker, Kubernetes, and service meshes. Whether you need a microservice control plane (MCP) or a modular monolith, we design architectures that evolve with your product.
Machine Learning & Data Processing
From real-time analytics to predictive models, we integrate machine learning directly into your backend. We work with frameworks like TensorFlow, PyTorch, and Scikit-learn, deploying intelligent features into production-ready APIs.
Security, Performance & DevOps
We implement secure authentication, access control, encryption, and monitoring into every layer. Our DevOps practices ensure smooth CI/CD pipelines, autoscaling, logging, and observability from day one.
Other projects with IOs technology
Help By
"With QueryBlocks, we built a telehealth solution that we launched in Ecuador and successfully tested with hospitals."
Steven Lauwers
COO & Founder
You might need work
"Together with QueryBlocks, we created a product that enables individuals and companies to connect and collaborate on jobs efficiently and at scale."
Nelson Canro
CEO & Founder
Atua
"With QueryBlocks, we were able to expand our Airbnb-style car rental business in Argentina and have already started renting vehicles to Cabify and Uber drivers."
Matias Mendiondo
CEO & Founder
Understanding your business logic and backend needs
We start by analyzing your business goals, expected scale, and required features. This step includes defining key data models, service flows, and selecting the right backend architecture.
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Transforming your ideas into digital success
We blend innovative technologies with cutting-edge design to create digital products that excel in both function and form. Discover how our expertise brings ideas to life.
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