> Markdown version of [/jobs/ext/2813250-senior-application-security-specialist](https://www.wearedevelopers.com/jobs/ext/2813250-senior-application-security-specialist). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Application Security Specialist

- **Company:** La Fosse
- **Location:** Greater London, UK
- **Experience:** Expert
- **Salary:** £90,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Software System Penetration Testing, Continuous Integration, Open Web Application Security, Systems Development Life Cycle, Secure Coding, Web Applications, Web Platforms, Software Security, Devsecops, Static Application Security Testing, Vulnerability Analysis, Dynamic Application Security Testing
- **Published:** September 10, 2026
- **Apply:** https://www.collegerecruiter.com/job/2840588706-senior-application-security-specialist

## About the Role

* Strong background in application security within complex technology environments.
 * Hands-on experience with secure coding, SAST, DAST, CI/CD integration, and DevSecOps practices.
 * Good understanding of OWASP Top 10, API security, threat modelling, and common web application attack vectors.
 * Able to operate as a credible technical SME while communicating clearly with senior stakeholders.
 * Experience improving security across customer-facing digital platforms in large-scale environments.

## Description

* Own and improve application security tooling, including SAST and DAST, across web, mobile, and API environments.
 * Lead application security testing activity, including penetration testing and bug bounty, working closely with internal teams and external partners.
 * Partner with engineering and product teams to embed security into the SDLC and drive a more proactive approach to AppSec.
 * Support the security of customer-facing applications and APIs, including oversight of threats such as credential stuffing and broader web application risk.
 * Build dashboards, metrics, and KPIs to improve visibility of application security posture and progress.
 * Provide technical leadership within AppSec, helping the wider team build capability and improve processes over time.


## Related Videos

- [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers)
- [DevSecOps: Injecting Security into Mobile CI/CD Pipelines](https://www.wearedevelopers.com/videos/273-devsecops-injecting-security-into-mobile-ci-cd-pipelines)
- [How to Cause (or Prevent) a Massive Data Breach- Secure Coding and IDOR](https://www.wearedevelopers.com/videos/39-how-to-cause-or-prevent-a-massive-data-breach-secure-coding-and-idor)
- [Project Fugu: Extending the web](https://www.wearedevelopers.com/videos/832-project-fugu-extending-the-web)
- [ Secure Code Superstars: Empowering Developers and Surpassing Security Challenges Together](https://www.wearedevelopers.com/videos/422-secure-code-superstars-empowering-developers-and-surpassing-security-challenges-together)
- [DevSecOps: Security in DevOps](https://www.wearedevelopers.com/videos/36-devsecops-security-in-devops)

## Related Articles

- [Understanding and Mitigating Common Web Vulnerabilities](https://www.wearedevelopers.com/magazine/565-understanding-and-mitigating-common-web-vulnerabilities)
- [The 8 Best Code Testing Tools](https://www.wearedevelopers.com/magazine/402-the-8-best-code-testing-tools)
- [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)
- [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)
- [Events like RSAC Get You CISOs. Developers Decide What Actually Gets Deployed.](https://www.wearedevelopers.com/magazine/693-events-like-rsac-get-you-cisos-developers-decide-what-actually-gets-deployed)
- [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers)