Senior AppSec Engineer

Leighton

5h

About The Position

Are you passionate about building security into software from the ground up? We’re looking for a Senior Application Security Engineer to take charge of strengthening and evolving security across our Loyalty division. In this role, you won’t just identify risks; you’ll lead the charge in transforming how secure software is built, working side-by-side with engineering and product teams to make security an intrinsic part of everything we deliver.

Requirements

• A background in software engineering with a security-first mindset
• Strong knowledge of modern web and API vulnerabilities (OWASP Top 10 and beyond)
• Hands-on experience with automation, scripting, and integrating security into CI/CD workflows
• Familiarity with security tooling such as SAST, DAST, and SCA
• Experience working in cloud-native environments (AWS), microservices, and containerised systems
• Confidence in reviewing architecture, leading threat modelling, and influencing secure design decisions
• Excellent communication skills, ability to engage, educate, and inspire engineering teams

Responsibilities

• Own and drive application security strategy, influencing key security metrics and outcomes
• Embed secure-by-design principles into every stage of the development lifecycle
• Partner with engineers and product teams to elevate security awareness and capability
• Introduce and optimise automated security controls within CI/CD pipelines
• Lead threat modelling and secure design discussions, shaping decisions around critical areas like authentication and data protection
• Ensure security tooling (SAST, DAST, SCA) is effective, scalable, and delivering real value
• Oversee and enhance testing initiatives including penetration testing, scanning, and bug bounty programmes
• Act as a trusted advisor to engineering teams triaging issues and guiding practical remediation
• Contribute to security standards, documentation, and audit readiness
• Champion a strong, proactive security culture across the organisation

Benefits

• A competitive salary this will be dependent on experience.
• A contributory pension scheme
• Private healthcare
• 25 days annual leave, plus bank holidays and the opportunity to buy or sell holiday
• A flexible approach to working hours
• Continuous personal development, career path and training

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed