API Development Services and System Integration Advice

API strategy and system integration

API Development Services for connected websites, SaaS products and legacy systems

Modern businesses rely on connected systems. A website may need to talk to a CRM, a SaaS platform may need to exchange data with an accounting system, a mobile app may need a secure backend, and a legacy platform may still hold operational data that the business cannot afford to lose. We help organisations plan and implement API foundations that make those systems work together more reliably.

Blue Donut Studios has experience developing and integrating SaaS, web systems, eBusiness platforms, healthcare workflows, retail and distribution systems, mobile applications, VR/Unity applications and legacy business software. We have provided API foundations for NHS-related services, integrated SaaS and web systems with NHS Digital Services, and helped provide vital data collection and storage capability during the COVID-19 pandemic for NHS work.

Our integration background also goes back to EDI (Electronic Data Interchange) services for national retail chains, DHL-linked services for the NHS and a wide range of distribution businesses. That gives us a practical understanding of data exchange, operational reliability, secure transfer, auditability and what happens when integrations become business-critical.

Connected software services, API, cloud, SaaS and business system integration illustration

API development and integration planning illustration

We can help create an API foundation for websites, SaaS products, mobile apps, eCommerce platforms, Unity applications, internal tools, legacy systems and third-party web services.

API (Application Programming Interface) Integration Services

We have a background in developing and integrating with many different software applications. If you have a legacy system such as AS/400, Sage MMS, Sage Line 500 we can help you connect to newer applications such as Microsoft AX. For those needing integration with third-party applications we can help develop and document API calls and write supporting code to help you communicate between valuable online resources.

Integration strategy and system mapping

We help you understand which systems need to connect, what data needs to move, who owns each process, where the source of truth sits, and what risks exist in the current workflow. This can include mapping websites, SaaS products, CRMs, ERP platforms, accounting systems, eCommerce tools, legacy databases, mobile apps and operational spreadsheets.

API design and service architecture

We can help design API endpoints, data structures, authentication approaches, integration flows, middleware, documentation, testing requirements and service boundaries. The aim is to create an API foundation that is understandable, maintainable and suitable for the size and risk profile of the business.

Reliability, monitoring and operational planning

APIs often fail because the technical build is considered without the operational reality. We help plan retries, logging, error handling, data validation, support processes, rate limits, change control, fallback procedures and the human workflow needed when a connected system does not behave as expected.

Security and data protection

Data security has to be designed into the integration, not bolted on later. We can help review access controls, authentication, API keys, token handling, encryption, audit logs, data minimisation, retention, hosting, supplier exposure and GDPR considerations for UK and EU organisations.

SaaS, website and mobile integration

We can support integrations for websites, customer portals, SaaS platforms, mobile apps, eCommerce systems, booking systems, payment services, content systems, reporting dashboards and internal business tools. We can help create the data layer needed for a service to move from concept to operational use.

Legacy, EDI and distribution experience

Our experience includes legacy environments, EDI services, AS/400-style systems, Sage MMS, Sage Line 500, Microsoft AX-style integration needs, DHL-linked services, national retail chains and distribution businesses. This helps when a business needs to modernise without discarding systems that still perform important work.

What API integration means for startups and small businesses

Reduce manual re-keying Connect SaaS tools Secure data flows Prepare for scale Modernise legacy systems Improve reporting

For startups and small businesses in the UK and EU, API integration can be the difference between a promising digital service and a fragile manual process. We can help you connect the systems that matter, protect sensitive information, reduce duplicated work, improve reporting, prepare for growth and avoid becoming trapped by poor platform decisions.

API foundations for web services, websites and business-critical data

We can help create the API foundation for a new web service, customer platform, SaaS product, booking system, data collection workflow, eCommerce operation, internal dashboard or mobile application. That may involve planning the data model, defining service boundaries, choosing the right integration pattern, documenting API calls, handling authentication and preparing the operational process around the technology.

Our NHS-related experience is particularly relevant where data collection, storage, privacy, reliability and clear audit trails matter. During the COVID-19 pandemic, we helped provide vital data collection and storage capability for NHS work, and our experience integrating web and SaaS systems with NHS Digital Services informs how we think about secure, resilient and practical API delivery.

We are also useful when you are dealing with older infrastructure. Many businesses still rely on legacy systems because they contain valuable data, support established processes or connect to suppliers. We can help bridge old and new systems without pretending that modernisation is simply a matter of replacing everything at once.

API Services We Offer

Integration strategy and system mapping.
API design, service architecture and documentation.
Web service, SaaS, website, mobile and eCommerce integration planning.
Legacy system connection, EDI and data exchange support.
Reliability, logging, error handling and operational planning.
Security, authentication, privacy and GDPR-aware data flow review.
NHS Digital Services and healthcare data workflow experience.

1Map

2Design

3Build

4Support