API & Integration Development
We build custom APIs and integrations for B2B software, mobile apps, and enterprise platforms — reliable, documented, and built to scale.
Schedule a Free Consultation See What We DoWhen systems can't talk to each other cleanly, the hidden costs stack up fast: duplicate data entry, fragile workarounds, slow onboarding for new tools, and engineers spending time on glue code instead of features. We help B2B companies cut through that complexity with APIs and integrations that are built properly from the start.
Let's talk about your integration challengeWe are a specialized software engineering team with deep experience in mobile app backends, enterprise system integrations, and API-first architectures. Here is what that means in practice:
We connect demanding systems, platforms, and applications into a stable, working whole — including ERP, CRM, logistics, and custom backends.
We develop APIs hand-in-hand with the apps that consume them. No hand-off friction, no mismatched contracts — one team, end to end.
We design for where you are going, not just where you are. Your API will handle growing load, new partners, and evolving requirements without major rework.
Every integration we build is designed around your actual systems and processes. We do not sell templates — we solve your specific problem.
What we actually build
Our team handles the full integration stack: backend APIs that power your mobile apps and web frontends, system-to-system integrations that keep your data in sync, and platform connectors that let you plug in third-party tools without losing control of your architecture.
We also work on real-time data pipelines, webhook systems, and event-driven architectures when your processes can't afford delays. Whether you are building something new or untangling an existing mess of integrations, we bring structure, documentation, and long-term maintainability to the table.
Discuss your API project for freeHow we work
»TELEMATICS enables farmers and service technicians to maintain oversight of their farm and machinery and make efficient decisions — a key element in our digitalization strategy. Cayas Software worked with us in close cooperation to develop the TELEMATICS app and did a great job, especially when it came to scaling for a large number of users and machines.«
API & Integration Partner
FAQ
A Web API (Application Programming Interface) is the backbone of modern software integration. It defines how your applications communicate with each other over the internet — whether that's your mobile app pulling data from your backend, your CRM syncing with your ERP, or a partner platform connecting to your service.
Without a well-designed API, data silos grow, manual work increases, and scaling becomes expensive. A clean, documented API lets your systems talk to each other automatically and reliably.
REST (Representational State Transfer) is the modern standard for web APIs. It is lightweight, flexible, and works seamlessly with mobile apps and web services. SOAP (Simple Object Access Protocol) is an older, more rigid protocol often used in enterprise and legacy systems.
We work with both. If you are building something new, we typically recommend REST. If you need to integrate with existing enterprise systems that use SOAP, we handle that too.
Yes. We have experience integrating with a wide range of enterprise platforms including ERP systems like SAP, CRM tools, logistics platforms, and custom backends. We review your existing API landscape, identify what already exists, and build exactly what is missing — without unnecessary duplication.
Yes. Good documentation is part of a good API. We deliver clear, structured documentation so your internal teams and external partners can work with your API confidently and independently. We use established formats like OpenAPI (Swagger) where appropriate.
Yes, absolutely. We collaborate with clients across Europe and internationally using async-first communication, structured sprint reviews, and clear documentation. Time zone differences are manageable with the right process, and we have experience making remote collaboration work well.
Yes. We regularly step into projects where a previous team has left off. We review the existing API architecture, document what we find, and either extend it or refactor where necessary. We do not rebuild things just to rebuild them — we focus on what actually improves stability, performance, or maintainability.
Security is built into our API development from the start, not added as an afterthought. This includes authentication and authorization (OAuth 2.0, JWT), encrypted connections (HTTPS/TLS), input validation, rate limiting, and secure error handling. We can also advise on compliance requirements relevant to your industry.
Costs vary depending on the complexity of your system landscape and integration requirements. In an initial conversation, we assess the scope together and give you a transparent estimate — no hidden fees. We can work on a fixed-scope basis or as an ongoing development partner depending on what fits your situation best.
App Development
A mobile app is only as good as the backend it talks to. We develop apps and their APIs together — same team, same codebase ownership, no interface friction. From the first architecture decision to go-live, we make sure the full stack works reliably and is ready for what comes next.
Learn about App DevelopmentCustom Software Development
Standard software solves standard problems. If your workflows, data structures, or integration requirements are complex, you need something built for your situation. We develop custom software solutions that fit your processes precisely — maintainable, scalable, and designed to grow with your business.
Explore our services
Developer Training
Want your team to understand modern app and API development from the inside? Our hands-on training sessions give developers and technical leads practical knowledge of how APIs, integrations, and mobile apps work together. Less reliance on external help, better decisions in your own projects.
Learn about our trainings
In a free 30-minute call, we will listen to your setup, ask the right questions, and tell you honestly what we think the smartest path forward looks like. No pitch, no pressure.