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Are you an experienced Security Engineer who enjoys sharing knowledge as much as solving complex technical challenges? Would you like to use your expertise to mentor the next generation of security talent, partner with engineering teams, and help make security a natural part of how we design, build, and deliver technology? As a Senior Security Engineer at Thredd, you will become a security ambassador across the business — you will use your technical credibility, communication skills, and a collaborative approach to influence engineering decisions, share security best practices, and help teams embed security into everyday decision-making. This role will play a key part in building scalable security solutions, controls, guardrails, and security visibility across AWS platforms and development workflows. By embedding security into the way we build and operate technology, you will enable continuous assurance and resilience by design, strengthen collaboration between security and engineering teams, and help create a culture where security accelerates innovation rather than slows it down. What you’ll be doing as a Senior Security Engineer Embed security-by-design across all initiatives, ensuring client trust, regulatory alignment, and strong collaboration with IT, business, legal, and external stakeholders. Design secure-by-default cloud and platform architectures, implementing automated security and compliance controls using policy-as-code and infrastructure-as-code to improve reliability and reduce manual effort. Build and maintain robust security telemetry, dashboards, and reporting to support data-driven risk assessments, vulnerability prioritisation, audit readiness, and alignment with frameworks (e.g., SOC 2, ISO 27001, NIST, CIS). Plan and execute complex initiatives, enhance guardrails and validation mechanisms across environments, and drive measurable improvements in security posture, compliance maturity, and operational resilience. Shape engineering best practices, identify systemic risks, and lead continuous improvement and change management efforts across systems and departments. Mentor and lead within the security architecture function, foster learning and leadership development, remove barriers to performance, and build a strong, future-ready security culture. Deliver reliable, well-documented security metrics and reporting aligned to business and regulatory needs; ensure controls are testable, monitored, and continuously enhanced through automation and engineering improvements. Influence engineering practices through technical leadership, identifying opportunities to reduce manual effort, improve reliability, and embed security-by-design across all technology initiatives. Work closely with IT and business stakeholders to integrate security requirements into project planning, manage organisational impact assessments, and ensure compliance without operational disruption. Maintain strong knowledge of cloud security, DevSecOps, application security, and compliance automation practices. Design and implement   secure-by-default cloud and platform architectures that embed preventative and detective controls, and build and maintain robust security controls, guardrails, and validation mechanisms across cloud, network, and application environments. Prioritise vulnerabilities, technical debt, and control improvements based on threat models and risk assessments. Build and maintain strategic relationships: with senior leadership, legal teams, and external regulatory bodies to ensure security strategies align with business and compliance requirements Shape talent development strategies to build a pipeline of future security leaders, ensuring a high standard of cybersecurity knowledge and capability across the team. What you'll bring to the Senior Security Engineer role           Demonstrate experience designing, building, and operat