Personal data protection for software development teams

Contrary to what a lot of people think, personal data protection is not just “a lawyer thing”.

Personal data protection tends to be treated as the exclusive turf of a company's legal or compliance departments. And there is something to that: they are the ones buried in the law and in endless documents, planning how to meet its requirements.

For technology teams, though, understanding the basics of this subject is just as important, if not more. A single line of code or a database query can directly determine whether your company respects its users' privacy.

Below we walk through some key concepts so that you, as a software developer, can take a leading role in this challenge. We will look at a few tips to make your software not only efficient and functional, but also respectful of users' privacy and of the proper handling of their data.

Key aspects: confidentiality, integrity and availability

When you build software that handles personal data, you have to start by securing three things: confidentiality, integrity and availability. These three principles are the foundation for keeping personal information secure, and therefore for keeping personal data protected.

Confidentiality: makes sure only authorized people can access the data.

Integrity: makes sure data is not altered or tampered with without authorization.

Availability: the data has to be available for use whenever it is needed.

These principles should not be left as an “extra” at the end of development: they belong in the picture from the moment you start designing your solution.

Recognizing personal data

Now, getting into the specifics of personal data protection, do you know the first thing you need to master? Identifying what counts as personal data. It sounds obvious, but it isn't.

Put simply, personal data is any information that can identify a person, whether directly or indirectly. That includes the classics like names, addresses and phone numbers, but also more technical things like IP addresses, cookies or device identifiers.

And anonymized data? Careful there! If there is any way to link it back to a person, it is still personal data and has to be handled with the same care. Make sure your team is clear on this: if you don't know what to protect, you will struggle to protect it well.

Privacy by design and by default

Let's talk about two key concepts: privacy by design and privacy by default. Both principles appear in Chilean law and in other regulations around the world.

Privacy by design means data protection has to be there from minute zero. It is not something you patch on at the end; it is a central part of how the software is conceived and built. Think of it as a mindset: designing with privacy in mind from the start.

An example: imagine you are building a messaging app along the lines of WhatsApp or Telegram. To get privacy by design right, you would build in data protection measures that respect the user's privacy from the very start of development. You could make end-to-end encryption a central part of the app's design, shape the interfaces and the app logic to minimize the personal data requested when creating an account, and decide that your users' online status will not be shared with other users by default, but only as a setting the user chooses to turn on.

Privacy by default, on the other hand, is about your software's initial settings. They should be the most restrictive ones in terms of exposing personal data.

Another example: if a user wants to share their location, that option should not be enabled by default. The user should be the one making that decision, not the software on their behalf.

Make these principles part of your team's DNA by building them into design and into the reviews you run during development. You will avoid legal trouble, and your users will thank you for it.

To process or not to process, that is the question 🤔

One question every developer should ask is: do I really need this data? Every time you decide to process or store personal data, you are stepping onto sensitive ground. The less data your app handles, the less risk you take on.

For example, do you really need to store a full date of birth, or is the year of birth enough? Do you need to keep IP addresses, or can you anonymize that field in your logs? Less data = less risk. It is that simple.

If, after thinking it through, you decide to ask for extra data, such as information for marketing or for a personalized experience, do it transparently and with the user's explicit consent. The key is to be clear, ask only for what you need and give users control over their data.

At Soyio, we help companies manage consent simply and efficiently. What does that mean? That we plug a clear, transparent system into your web forms or apps so you can ask your users for authorization properly, without complications.

We also produce a unified record of every consent your users grant across different channels. So you always know what, where and when your users authorized you to use their data. That makes day-to-day management easier and also gives you solid, organized evidence for audits.

Want to know more? Explore our documentation and find out how we can help you meet the regulations.

Get your software ready for users to exercise their rights

Did you know your users have rights over their data? And not only that: they expect you to help them exercise those rights simply and reliably. So you will save yourself a lot of headaches if you get ready to do the following:

Access and portability: let users see their data and, if they ask for it, download a copy in accessible formats such as JSON or CSV. Make sure the process is secure and includes a check confirming that the person requesting the data really is its owner.

Correction and erasure: make it easy for users to fix errors in their data or to request that information be deleted. This improves the user experience and also protects you from legal problems.

Objection to automated decisions: if your software makes automated decisions that affect users, give them a way to object and ask for those decisions to be turned off. This is a fundamental right and should not be overlooked.

💡 At Soyio we simplify how you handle user rights requests, with an intuitive module you can plug into your platforms easily. Our solution:

Connects in real time to the consent record so everything stays traceable.

Makes reviewing and managing requests easier for both users and your team.

Includes identity validation to keep personal data secure.

If you need help handling these requests from your users, take a look at soyio.id and get in touch.

Documentation: your best ally

Last but not least: documentation. It is not only for meeting regulations or auditing processes, it is also your insurance against chaos. Why? Because documenting what data you collect, for how long, how and where you store it and who has access makes internal collaboration, onboarding new team members and security reviews much easier.

Good documentation is the glue that keeps everything in order, from the data you handle to how you protect it. And believe me, when audit time comes around, the compliance team will love you.

Data protection is not only the legal or compliance team's responsibility. Those of us on technical and software development teams also play a crucial part in making sure users' personal data is handled securely and respectfully. By keeping these practices in mind, we can improve the user experience and build trust, while making compliance easier at the same time.