Security Design Engineer (AppSec)

The Company

Superb opportunity to join a leading financial services client with offices in Edinburgh.

This is an initial 6-month contract inside IR35. There will be a requirement to be in the office up to 3-days per week.

The Role

We are seeking an experienced Security Design Engineer (AppSec) to lead end-to-end security solution design across complex technology environments. You will produce high-quality architecture and design artefacts aligned to business and security standards, influence strategic direction, and provide hands-on application security expertise across large-scale transformation programmes.

What you’ll do

• Own and deliver secure solution designs, architecture patterns, design decisions, and risk assessments
  
  
• Partner with enterprise and solution architects to ensure alignment with strategic architecture
  
  
• Provide technical leadership and act as an AppSec subject matter expert for delivery teams
  
  
• Design and embed security into modern application stacks and CI/CD pipelines
  
  
• Present designs and recommendations to design authorities and senior stakeholders
  
  
• Identify control gaps, define remediation plans, and manage residual risk
  
  
• Support governance, peer review, and architectural assurance processes
  
  What you’ll bring
  
  
• Deep application security experience across cloud-native, microservices, containerised and Kubernetes environments
  
  
• Strong expertise in SAST, DAST, IAST, MAST, SCA, SBOMs, and supply-chain security
  
  
• Proven experience integrating security testing into CI/CD (e.g. GitHub Actions, GitLab, Jenkins, Azure DevOps)
  
  
• Threat modelling, secure SDLC design, and risk-based security policy development
  
  
• Experience in vulnerability and exposure management and network security concepts (segmentation, logging, scanning)
  
  
• Familiarity with industry frameworks (OWASP SAMM/ASVS, NIST SSDF, SLSA, CSA)
  
  
• Ability to communicate complex security concepts to both technical and non-technical stakeholders
  
  
• Experience working in large, complex IT transformation programmes
  
  Tools & technologies
  
  
• AppSec tools such as Checkmarx, Invicti, Snyk, Black Duck, Tenable (or similar)
  
  
• Architecture modelling (e.g. BizzDesign, Archi, UML)
  
  
• Jira and Confluence
  
  Qualifications (preferred)
  
  
• Degree in cybersecurity, computer science, software engineering, or related field
  
  
• CISSP, CISM, or equivalent cybersecurity certification
  
  
• SABSA or TOGAF certification
  
  This is an opportunity to shape secure architecture at scale, influence senior stakeholders, and drive developer-centric security practices in a complex enterprise environment.
  
  More details available on successful application