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 applicat...