---
title: "Custom software development for SMEs"
description: "We design, build and run web and mobile apps, platforms, APIs and real-time systems. Experience with APIs serving 50M+ monthly users and live 5G monitoring."
canonical: https://sdk.enterprises/en/services/product-engineering
language: en
---

# Custom apps, shipped on time and fast under real traffic.

From a first version to a platform with millions of users. We build web and mobile apps, the APIs and backends behind them, and real-time features like live dashboards and alerts. You see working software every week, and you keep code your team can change.

## When teams call us

- You have an idea or a spec, but no team to build it
- Pages and APIs slow down every time traffic peaks
- Every change to an old codebase risks breaking something else
- Your users need live data, not yesterday's report

## What we deliver

- **Web and mobile apps**: Product screens, admin tools and internal apps, designed with you and shipped in small working steps.
- **APIs and backends**: Documented APIs in PHP (Laravel, Symfony), Java (Spring Boot), Node.js or Python, with caching and queries tuned for real traffic.
- **Real-time systems**: Streaming ingestion, WebSocket dashboards and alerts that fire on their own, for data that matters right now.
- **Upgrades and rewrites**: Old frameworks and language versions upgraded step by step, with tests guarding each move.

## How it runs

- **Agree the first version**: One call and a written scope: what we build first, what done looks like and who builds it.
- **Build in small steps**: A demo of working software every week, so you can try it and change direction early.
- **Review and release**: Another engineer reviews every change, and critical paths are tested before anything goes live.
- **Hand over or keep going**: You get the code, documentation and runbooks. We keep running it with you, or step away.

## Related work

Our engineers re-architected critical APIs for NorthStar Network's sports media platform, serving 50M+ monthly users, and built Slump's real-time 5G monitoring platform for operators in southern Spain.

- [Re-architecting APIs for a sports media platform with 50M+ monthly users](https://sdk.enterprises/en/work/northstar-sports-media-apis)
- [Real-time 5G network monitoring for operators in southern Spain](https://sdk.enterprises/en/work/slump-5g-monitoring)
- [Secure platforms for energy-sector clients through Sopra Steria](https://sdk.enterprises/en/work/energy-platforms-sopra-steria)

## FAQ

### Which stacks do you work in?

PHP 8 with Laravel, Symfony and CodeIgniter; Java with Spring Boot; Node.js and Python where they fit; React on the front end. MySQL, PostgreSQL, Redis and Elasticsearch on the data side.

### Can you start from just an idea?

Yes. Bring the problem and who it is for. We help you cut it down to a first version worth building, then we build it.

### Will you rewrite our existing system?

Rarely. We fix the parts that hurt most first and change the architecture where it pays back, so your product keeps shipping during the work.

### Can you add real-time features to an existing product?

Yes. Live updates and alerts can often be added next to an existing backend, without a rewrite.

## More ways to get this done

- [Hire full-stack developers](https://sdk.enterprises/en/hire/full-stack-developers): Vetted freelance full-stack developers who ship features from the database to the screen.