Secure Software Development: What It Is & Why It Matters

What it is

Secure software development is the practice of building security into software from the outset and throughout its lifecycle, rather than treating it as a final check or an afterthought once something goes wrong. It applies whether an organisation builds its own systems or significantly customises others, and it is sometimes described through a secure software development lifecycle.

The idea is that security is cheaper, more effective and less disruptive when it is considered while software is being designed and written, instead of being retrofitted later. It is a way of working, not a single tool, and it touches everyone involved in producing software.

Key principles

Secure development weaves security into each stage of building software. A common shorthand is to shift left, meaning to consider security earlier in the process where issues are easier and cheaper to address.

• Requirements and design — thinking about threats and abuse cases, not just features.
• Secure coding — following safe practices and avoiding well-known classes of flaw.
• Code review and testing — peer review and security testing before release.
• Dependency management — keeping third-party components current and free of known issues.
• Change control — releasing changes in a controlled, reviewable way.

Threat modelling, secure coding standards and automated security testing within the build pipeline are common tools, but the underlying principle is to make security a normal part of producing software rather than a separate event.

Why it matters for debt recovery

If a provider builds or heavily customises the systems that hold debtor data, the security of that software determines a large part of the overall risk. Many of the weaknesses that lead to data exposure originate in how software was designed and written. Secure development matters because it reduces those weaknesses at the source, before they ever reach production.

For a risk team, secure development practices indicate that a provider does not rely solely on perimeter defences. Software that is designed and tested with security in mind is less likely to contain the flaws, such as broken access control or unsafe input handling, that attackers seek out.

What to ask a provider

Helpful questions include:

• How is security considered during design, including threat modelling?
• Do you follow secure coding standards and perform security-focused code review?
• How is security testing integrated into your build and release process?
• How do you manage and update third-party dependencies?

A provider with mature practices can describe security as part of how software is produced, not a separate sign-off at the end. These practices connect closely to the application risks in the security overview we publish.

How Merion approaches it

Merion follows good practice by considering security throughout development, including thinking about threats during design, reviewing and testing changes, and keeping dependencies current.

This page is general information and not a claim of any particular assessment for Merion. As practices and tooling evolve, please verify a provider's current development practices directly during due diligence.