Since 2010 we have shipped 100+ apps, and we know an app is only as solid as the backend behind it. We design and build the APIs, serverless functions and cloud infrastructure that power mobile and web products, with Node.js, Go and Rust on AWS, GCP, Firebase and Kubernetes.
Fast, documented APIs your apps can rely on.
REST and GraphQL APIs, authentication, payments, notifications and integrations with the systems you already use. Built in Node.js and TypeScript, Go or Rust, documented with OpenAPI and designed around the way mobile and web clients actually consume data.
Infrastructure that grows with your user base.
Serverless and container-based architectures on AWS, Google Cloud and Firebase. We use managed services where they save you work and custom components where they save you money, so the platform scales with your traffic instead of with your operations team.
Ship often, sleep at night.
CI/CD pipelines, infrastructure as code and Kubernetes clusters that make releases routine. Automated tests and deploys, staging environments that match production, and monitoring that flags problems before your users notice them.
The server side of your mobile app.
Backends designed for iOS and Android clients: offline sync, push notifications, real-time messaging and secure file uploads, plus integrations with CRMs and enterprise systems. We also run the WhatsApp Business messaging infrastructure behind MyPorter, our own AI assistant for short-term rentals.
We map your product, data and integrations, then agree on requirements, expected traffic and budget constraints.
We design the data model, APIs and cloud architecture, and document the trade-offs before writing code.
Iterative development with automated tests, code review and a staging environment you can try at every step.
Deploy, monitoring and ongoing maintenance. We keep running the platform for you or hand it over to your team with full documentation.
Backends are where apps succeed or fail at scale. We build both sides, so the API is shaped by the app that uses it.
APPSTYX is a software house in Florence, Italy. Since 2010 we have shipped native iOS and Android apps for retail chains, media and sports brands, public institutions and enterprise field teams. Our co-founder Matteo Innocenti leads DevOps and cloud infrastructure, so the same team that builds your app can design, deploy and monitor the backend behind it.
Need the app as well? See our mobile app development services. Want an existing platform reviewed? Our cybersecurity team runs penetration tests and cloud hardening.
It depends on the job. Node.js with TypeScript is our default for most APIs because it is fast to develop and shares a language with web front ends. We use Go for high-throughput services and Rust where performance and memory safety matter most. We recommend one and explain why.
Firebase is a great fit for getting a mobile app to market quickly, with authentication, real-time data and notifications ready to use. AWS and Google Cloud make sense when you need more control, heavier workloads or specific compliance requirements. Many projects combine them, and we keep the architecture portable where it matters.
Yes. We start with a review of the code, infrastructure and running costs, then propose a plan: fixing bottlenecks, adding tests and CI/CD, moving workloads to managed cloud services or rewriting the parts that hold you back.
Both. We have been building native iOS and Android apps since 2010, so we can deliver the full product or work alongside your in-house app team on the server side only.
Your choice. We can keep running and monitoring the platform for you, or hand it over to your team with documentation, infrastructure as code and deployment pipelines they can run on their own.
Yes. We are based in Sesto Fiorentino, Florence, and work with clients across Italy, Europe and worldwide, in English or Italian. Most projects run remotely, with on-site meetings when useful.
Via San Morese 9, 50019
Sesto Fiorentino (FI) Italy