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SaaS - What is Software-as-a-service?

The future of modern software solutions for companies and public administrations

Software-as-a-Service (SaaS) concept | Digital cloud subscription model & business applications

June 29, 2026, Reading time: 8 minutes

At a glance: What is Software-as-a-Service?

Software-as-a-Service (SaaS) is a cloud computing model in which software applications are provided and used directly via the Internet instead of installing them locally on their own devices.

The most important features for companies and authorities:

  • No own IT effort: The cloud provider (like STACKIT) takes over the complete hosting, automatic updates, maintenance and backups.
  • Full flexibility: Users can access the applications via web browser regardless of device.
  • Predictable costs: Instead of high one-time investments for licenses and hardware, a transparent subscription model is used (e.g. monthly).
  • Highest data security: Modern European SaaS solutions guarantee GDPR compliance and operation in certified data centers to protect sensitive data.

Digitization is not a trend, but a reality. It poses the same central question to companies and public institutions alike: How can we keep our IT efficient, secure and flexible - now and in the future? The answer is increasingly: SaaS - Software as a Service.

Instead of laboriously installing software on individual computers, with SaaS solutions users simply access the desired applications via the internet. The software runs in the cloud: without the need for in-house IT management or hardware. This saves resources, ensures greater agility and makes organizations of all sizes fit for everyday digital life.

SaaS also enables simple collaboration across departments and locations. Thanks to central data storage, information is always up-to-date and immediately accessible to authorized users - regardless of the device.

SaaS: Find out how the cloud is changing your IT

SaaS is a building block in the larger concept of cloud computing, which also includes Platform as a Service (PaaS) and Infrastructure as a Service (IaaS). While Infrastructure as a Service (IaaS) primarily provides the technical basis - i.e. storage and networks - and PaaS serves as a development environment for programmers, SaaS is aimed directly at end users: they access mobile applications without any installation or complex set-up. This not only reduces the amount of training required, but also the time needed to introduce new software solutions - a clear advantage in a dynamic working environment.

The entire software runs on the SaaS provider's servers, which take care of everything: from updates and maintenance to security, backups and support. All users need is a web browser or an app - and they can get started straight away. Cloud computing allows resources to be provided flexibly and in line with demand. Providers such as STACKIT not only provide the technical infrastructure, but also support with expertise and GDPR-compliant solutions from Germany. This strengthens trust among customers and partners and promotes long-term, secure digitalization strategies.

SaaS: Everything you need to know about the key terms

SaaS with STACKIT: The clear advantages for companies and authorities

1. Stay flexible, scale easily

SaaS scales with you—whether you’re a startup, a local government, or a large public agency. New users? No problem. Additional features? Quickly integrated. And all without the hassle of buying hardware or dealing with complicated installations. For organizations with fluctuating needs—such as healthcare services or cities experiencing project peaks—this flexibility is worth its weight in gold.

2. Easily calculable—no unpleasant surprises

Large one-time investments? There aren’t any. Instead, companies and government agencies simply pay a monthly or annual fee—and get everything from a single source. This makes costs predictable and ensures full budget transparency.

3. Updates run automatically

Missed a security patch? Not with SaaS. We handle all the technical details behind the scenes—from the latest features to patching security vulnerabilities. This allows your IT teams to focus on strategic priorities instead of having to manage individual applications or the server itself.

4. Data protection included—at the highest level

Security and protection against unauthorized access are absolutely essential, especially when it comes to sensitive data—for example, in healthcare or government administration. Modern SaaS providers rely on certified data centers, encryption, and clearly defined access rights. Compliance with the GDPR is a given at STACKIT.

5. Working from Any Location

Whether in the office, working from home, or on the go with a tablet—SaaS software is always at your fingertips. Everything runs over the Internet, without complicated VPNs or local servers. Mobile access ensures that teams can work flexibly and from anywhere—with access to all relevant data and tools. This also makes it easier to integrate external service providers or project-based teams, who can get to work immediately without needing additional IT infrastructure—a major advantage for modern ways of working.

Employees in digital data management and document management | Filing, archiving & cloud storage

SaaS in the public sector: digital sovereignty and efficient processes

Digital transformation is at the top of the agenda for many municipal and state administrations. SaaS software makes it possible to provide administrative applications quickly, securely and economically - without the need for in-house infrastructure or costly IT projects.

Typical requirements in the public sector

  • Data protection and compliance: Public bodies must meet the highest security requirements. STACKIT, with server locations in Germany and Austria, certified data centers and GDPR-compliant processes, offers clear advantages here.
  • Cost transparency: Every expense counts, especially when budgets are tight. SaaS models with clearly defined services and ongoing fees make planning easier and avoid unforeseeable additional costs.
  • Flexibility and expandability: Requirements for digital applications are constantly changing - whether due to new legal requirements, organizational changes or technical developments. SaaS solutions can be modularly expanded and specifically adapted without the need for in-depth system interventions or complex development processes.
  • System integration: Existing IT structures and specialist processes must remain usable. Modern SaaS platforms offer interfaces for smooth integration.
  • Accompaniment and support: Expert support from experienced providers is required, especially for awarding and tendering procedures - from planning to implementation.

Typical SaaS fields of application in municipalities and public authorities

  • Digital citizen services (e.g. online applications, appointment scheduling)
  • Document management and audit-proof archiving
  • Communication and collaboration tools (e.g. video conferencing, internal platforms)
  • Specialist applications for finance, human resources, regulatory affairs or social administration
A doctor or medical professional in a white coat with a stethoscope types on a laptop while holding a smartphone. Above the laptop, a holographic projection of a blue circle with a heart symbol in the center and many smaller icons representing digital health services (e.g., Wi-Fi, communication, medication) hovers. Another person in a shirt is in the background. The image symbolizes e-health, telemedicine, and digital transformation in healthcare.

SaaS in the healthcare sector: Security and innovation

The healthcare sector has particularly high IT security and compliance requirements. The processing of sensitive patient data requires reliable technical and organizational measures. SaaS solutions can make an important contribution if you have to meet industry-specific standards.

Typical requirements for SaaS in the digital health environment

  1. Data sovereigntyHealth data must generally be stored within Germany or the EU - ideally in certified, locally operated data centers.
  2. Certified infrastructure: Providers should have security certifications such as ISO/IEC 27001 or comparable standards.
  3. Integration: A seamless connection to existing systems in practices, clinics or laboratories is essential - e.g. to HIS, PVS or laboratory systems.
  4. Scalability: SaaS platforms must grow reliably with the growing number of users, applications and data volumes.
  5. Compliant data processing: Compliance with the GDPR, the IT Security Act and sector-specific regulations (e.g. Section 203 of the German Criminal Code or the Digital Health Applications Ordinance) is mandatory.

Typical application scenarios for SaaS in the healthcare sector

  • Patient management systems
  • Telemedicine platforms
  • Scheduling and resource planning
  • Analysis and reporting software for medical or administrative evaluations

Finding the right SaaS provider: What customers should look out for

Location and legal certainty

Data centers in Germany or the EU ensure compliance with European data protection standards - a must for companies and public institutions. Providers such as STACKIT are experienced, rely on German infrastructure and offer full GDPR compliance.

Certifications and security standards

Pay attention to ISO certifications (e.g. ISO/IEC 27001), modern encryption and transparent security processes - ideally with regular audits and emergency concepts STACKIT meets all the key requirements for secure cloud operation.

Integration into existing systems

Open interfaces (APIs) and compatibility with existing tools facilitate the connection and ensure a smooth start.

Transparent price structure

A good SaaS offering is characterized by clear, comprehensible costs - without hidden fees. Flexible billing models make it possible to plan usage.

Reliable support & services

An experienced provider not only accompanies its customers through the introduction, but also during ongoing operation - with training, documentation and a personal contact person. STACKIT supports its customers with technical expertise and direct support from Germany.

SaaS as the key to digital transformation

SaaS has long been more than just a technical delivery model - it is a driver of innovation, efficiency and digital sovereignty. The benefits are compelling: flexible use, predictable costs, high security standards and easy integration with existing systems. In the public sector and healthcare in particular, SaaS opens up the possibility of providing modern digital services - while reliably meeting the strictest data protection and compliance requirements.

Those who rely on SaaS are investing in a future-proof solution that grows with their requirements, conserves resources and creates scope for strategic development. It all depends on having the right partner: STACKIT not only offers a GDPR-compliant infrastructure with server locations in Germany and Austria, but also reliable support, technical expertise and a deep understanding of industry-specific requirements.

After all, digitalization is not a one-off project, but a continuous process. With a strong SaaS partner at your side, it becomes a real driver of progress - for your organization, your employees and your customers.

FAQ - frequently asked questions about SaaS solutions

How can I successfully migrate to a SaaS application without losing data?

Structured data migration is crucial. Good providers - such as STACKIT - actively support you with suitable software, personal advice and good service in order to transfer existing data securely and completely.

What specifically needs to be considered when it comes to data protection?

Clear access regulations and role-based authorization concepts are important so that only authorized persons can access sensitive information. STACKIT offers GDPR-compliant solutions with server locations in Germany and Austria - so sensitive data remains protected at all times.

How do you convince management teams of the new solution?

Success stands and falls with user acceptance - and this begins even before the introduction. Training, transparent communication and the early involvement of employees are crucial. If teams are involved right from the start, not only will acceptance increase, but also long-term use and efficiency in day-to-day operations.

How does the SaaS solution stay up-to-date in the long term?

SaaS applications are constantly evolving. Automatic updates regularly bring new functions and security improvements - without any effort on the part of your IT department.

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