Is custom software less secure than off-the-shelf software?

Not necessarily. It depends on how consciously security was included during the development process. A good partner builds security in from the start, so custom work can be just as secure as standard solutions.

Do I as a business owner need technical knowledge to assess security?

No, but you do need to dare to ask the right questions. Ask about access control, data protection, maintenance after delivery, and agreements around GDPR.

What happens if something goes wrong with my data?

A reliable software partner has a plan in place beforehand for data breaches and incidents. Ask about this before you start, so you know what steps are taken and who you need to inform, such as customers or regulators.

Security in Custom Software: What to Watch for as a Business Owner

Custom software gives you great freedom, but also comes with responsibility when it comes to security. As a business owner, you don't need to be a technician, but you do need to know what questions to ask your software partner. In this article, we explain what security in custom software is about and how you as the client stay in control.

Why security in custom software is different from off-the-shelf software

With standard software from large vendors, security is often already built in and tested by thousands of users worldwide. With custom software, you're building something unique, specifically for your business. That means security doesn't come automatically, but must be a deliberate choice throughout the entire process. A good software partner thinks about this from the first sketch, not after the system is already running.

Access and permissions, who can see what

One of the most important security principles is that not everyone needs access to everything. Think of a system where employees only have access to the information they need for their job. This is called the principle of minimal access and prevents sensitive data from spreading unnecessarily wide within your organization.

Make sure user roles are clearly defined, for example administrator, employee, or external party.
Ask how passwords and login credentials are protected.
Check whether a log is kept of who did what in the system.

Data protection and GDPR

Once you process personal data, such as customer data, personnel files, or order history, you're dealing with GDPR. Custom software must be set up so that data is stored safely, not kept longer than necessary, and only accessible to authorized persons. Ask your software partner explicitly how they handle this and put agreements in place, for example in a data processing agreement.

Also pay attention to where the data is stored. This can affect which legislation applies and how easily you can comply with customer requests, such as the right to access or deletion of their data.

Testing, checking and monitoring

Software that has been delivered once is never finished when it comes to security. New vulnerabilities are constantly discovered, and software that is not maintained becomes more vulnerable over time. So ask not only about security at delivery, but also about maintenance afterward.

Are vulnerabilities checked periodically?
Is there a plan for if something goes wrong, such as a data breach?
How quickly are updates rolled out if a problem is discovered?

A reliable partner is transparent about this and documents it in the collaboration agreements, so you know where you stand, even after delivery.

Working with third parties and integrations

Custom software rarely stands alone. Often it is linked to other systems, such as an accounting package, a CRM system, or external payment services. Each integration is a point where data leaves or enters the system, and therefore a moment where extra attention to security is needed.

Ask about each integration who is responsible for security on both sides and how data is protected in transit. A good partner can explain this clearly without you needing technical knowledge yourself.

What you can do as the client

Security is not only the responsibility of your software partner. As the client, you also play a role, for example by staying critical and asking questions throughout the entire process, not just at the start. Make sure security is part of the conversation with every new feature, not something that gets added later.

In addition, it helps to make clear internal agreements about who has access to which systems, and to make employees aware of safe use, such as not sharing passwords or reporting suspicious situations.