# What is the role of security in software development? [Home](https://3bird.nl/)/What is the role of security in software development? # What is the role of security in software development? Security plays a fundamental role in software development: it protects user data, prevents unauthorized access, and ensures that an application remains reliable under pressure. Without active attention to security during the development process, vulnerabilities arise that are later difficult and costly to fix. In this article, we answer the most frequently asked questions about security in software development, from common risks to the right time for an external audit. ## What security risks arise during software development? During software development, security risks arise when code is written, dependencies are added, or configurations are set up without sufficient attention to security. The most common vulnerabilities are injection attacks, insecure authentication, exposed sensitive data, and incorrectly configured access permissions. Specific risks that regularly occur include: - **SQL injection and code injection:** attackers send malicious input that the application executes as code - **Weak authentication policies:** simple passwords or missing two-factor authentication make accounts vulnerable - **Unsecured APIs:** endpoints that return too much data or do not perform authorization checks - **Outdated libraries:** external packages with known vulnerabilities that are not updated - **Hardcoded credentials:** passwords or API keys stored directly in the source code Many of these risks arise not from carelessness, but from time pressure or a lack of knowledge about security principles. That is precisely why it is wise not to treat security as a separate step at the end of the process, but as a continuous point of attention throughout the entire development process. ## What is the difference between security by design and security testing after the fact? Security by design means that security is incorporated into every design decision and every line of code from the very beginning of the development process. Security testing after the fact means that an application is only tested for vulnerabilities after the software has already been built. The difference lies in timing, cost, and effectiveness. With **security by design**, you already think during the design phase about questions such as: who is allowed to view which data? How are sessions managed? Which input needs to be validated? This prevents vulnerabilities from being baked into the architecture, which would later make them virtually impossible to fully remove without rewriting large parts of the application. **Security testing after the fact**, such as penetration testing or static code analysis, is still useful and even recommended, but it does not solve structural problems. It finds symptoms, not always the root cause. Moreover, a vulnerability that is only discovered after delivery is on average many times more expensive to fix than one that is prevented during the design phase. The best approach combines both: build with security in mind and validate that with targeted tests before going live. ## How is security integrated into an agile development process? Security is integrated into an agile development process by including security tasks in every sprint, rather than treating them as a separate phase. This is also known as **DevSecOps**: a working method in which development, security, and operations collaborate closely. Practical ways to embed security in agile include: - **Threat modeling in the planning phase:** identify per sprint which security risks are relevant to the functionality you are building - **Secure coding guidelines:** ensure the team works with agreed standards for input validation, error handling, and authentication - **Automated security tests in the CI/CD pipeline:** tools that check every commit for known vulnerabilities in code and dependencies - **Code reviews with a security focus:** have colleagues explicitly pay attention to security aspects when reviewing pull requests - **Regular dependency updates:** keep external libraries up to date to close known vulnerabilities By including security as a fixed part of the definition of done, you prevent it from becoming a bottleneck at the end of a release. ## Which security standards and norms are relevant to software development? The most relevant security standards for software development are the **OWASP Top 10**, **ISO 27001**, and **NEN 7510** (for the healthcare sector). Which standards apply to your situation depends on the sector, the type of data you process, and the market in which you operate. An overview of commonly used standards: - **OWASP Top 10:** a list of the ten most critical web application vulnerabilities, widely recognized as a starting point for every web application - **ISO 27001:** international standard for information security, relevant for organizations that want to demonstrably work securely - **AVG/GDPR:** European privacy legislation that sets requirements for how personal data is processed and secured - **PCI DSS:** mandatory for applications that process payment data - **NEN 7510:** specific to healthcare institutions in the Netherlands that process medical data For most software development projects, the OWASP Top 10 is a good starting point. Depending on the sector and the type of data your application processes, additional standards may be mandatory or strongly recommended. ## Why is security especially critical in remote software development? In remote software development, developers work from different locations, networks, and devices, which increases the attack surface. Security is particularly relevant here because sensitive code, client data, and access permissions are shared across digital channels, each of which carries its own risk. Specific points of attention in remote development include: - **Access management:** ensure that every developer only has access to the systems needed for their work (principle of least privilege) - **Secure communication channels:** use encrypted connections and VPNs for access to company systems - **Version control and audit trails:** keep track of who has made which changes to the codebase - **Onboarding and offboarding:** ensure a clear process for revoking access rights when a developer leaves the team - **Contractual agreements:** record confidentiality obligations and security responsibilities in agreements Remote working does not inherently carry higher risks if the right processes and tooling are in place. It does require deliberate choices and clear agreements made in advance. ## When should you have an external security audit carried out? An external security audit is advisable before going live with a new application, after major changes to the architecture, and when processing sensitive data such as payment information or personal data. An external party looks with fresh eyes and finds vulnerabilities that an internal team may overlook. Situations in which an audit is particularly useful: - You are launching a new application that is accessible to the public or customers - You are processing financial data, medical information, or other sensitive personal data - You have carried out a major refactoring or new integration - A client or partner requests demonstrable security validation - You want to comply with a specific standard such as ISO 27001 or PCI DSS An audit does not need to happen annually as a routine, but it should occur at logical moments in the lifecycle of your software. Think of a penetration test before going live and thereafter with every significant release featuring new functionality or integrations. ## How we help with secure software development At 3Bird, we combine more than 25 years of experience in software development with a working method in which security is not an afterthought, but a fixed part of our process. Our Dutch fractional CTOs actively guide the development team and ensure that security agreements are upheld, even in remote collaboration. What you can expect from us in the area of security: - Developers who work according to common security standards such as the OWASP Top 10 - Clear agreements on access management, confidentiality, and responsibilities - Guidance in Dutch, so you always understand which choices are being made and why - Flexible teams that scale up and down, with quality control maintained by our CTOs - Support across a wide range of technologies, from cloud environments on AWS and Azure to mobile apps in Flutter and Swift Would you like to know how we approach your software development project securely and affordably? **Get in touch via [contact@3bird.nl](mailto:contact@3bird.nl) or call us at +(31)75-7993038.** We are happy to think along with you about the approach that suits your situation. ## Ready to Get Started? Talk to us about your project and find the right 3Bird solution. [Contact Us Today](https://3bird.nl/contact/) --- Book a free 30-minute consultation: https://calendly.com/3-bird/3bird-oscar-30-minuten-meet Email: contact@3bird.nl | Phone: +31757993038