Security Design Engineer; AppSec

Position: 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 (App Sec) 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 App Sec 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. Git Hub Actions, Git Lab, Jenkins, Azure Dev Ops)

* 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

* App Sec tools such as Checkmarx, Invicti, Snyk, Black Duck, Tenable (or similar)

* Architecture modelling (e.g. Bizz Design, 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