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Secure Software Development

Technology Fundamentals

Secure Software Development

1 min readPublished 22 Jul 2026

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Most breaches exploit software flaws, so secure software development — building security into the development lifecycle — is one of the highest-impact areas of cyber security.

Interactive explainer

Secure Software Development

Building security in from design to deployment.

1Design2Code3Test4Deploy & maintain

Tap or hover a part to learn more.

Design

Threat model.

Consider threats and security requirements during design — the cheapest place to prevent flaws. Shifting left starts here.

Check your understanding

1. What is the OWASP Top 10?

2. When is a flaw cheapest to fix?

Keep learning

Secure Software DevelopmentDevSecOps CSSLP / GIAC GWEB
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Building security in

  • Secure SDLC — weave security into every phase: requirements, design (threat modelling), coding, testing and deployment (DevSecOps).
  • The OWASP Top 10 — the essential list of the most critical web application risks (injection, broken access control, etc.).
  • Input validation — never trust user input; validate and encode to prevent injection (SQL injection, XSS).
  • Secure defaults & least privilege — the safe option is the default.
  • Code review & testing — SAST/DAST and peer review catch flaws early.

Fixing a flaw in design costs a fraction of fixing it in production — security must shift left.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

Software flaws cause most breaches, so secure development skills are highly valued and impactful.

Technical questions
How do you build security into the development process?+

Shift left: threat model in design, validate input, use secure defaults, run SAST/DAST and peer review — security in every phase.

Behavioural questions
Describe improving quality by catching issues early.+

Show preventing defects in design/build rather than fixing them in production.

Real-world scenarios
“A web app concatenates user input into queries and HTML.”+

Expected answer: Flag injection/XSS risk — enforce input validation, parameterised queries and output encoding, guided by the OWASP Top 10.

Practise in AI Interview™Rehearse these questions, scored.Plan with Career Coach™A personalised path to your goal.Evidence it in Career Passport™Prove this skill to employers.

Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles
Application Security EngineerDevSecOps EngineerSoftware Developer
Skills you're proving
Secure SDLCOWASP Top 10Input validation
Recommended certifications
CompTIA Security+GIAC GWEB / CSSLP
Career progression

Cyber Fundamentals → AppSec/DevSecOps roles.

What employers expect

That you understand core security principles and can apply them to real risks, controls and incidents.

Frequently asked questions

What is the OWASP Top 10?

A widely used list of the most critical web application security risks, such as injection and broken access control.

What is a secure SDLC?

A software development lifecycle with security built into every phase, from requirements and design through to deployment.

How do you prevent injection attacks?

Validate and encode all untrusted input, and use parameterised queries and safe APIs.

Related guides

Cyber Security Fundamentals: Principles, Threats, Defence & OperationsSecurity Principles: CIA, Defence in Depth & Zero TrustRisk Management & GovernanceThreat Actors & Threat Intelligence

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