Senior DevSecOps Engineer - Linux, IAM, HashiCorp Vault Perm or Contract - London, UK - Hybrid working A leading quantitative technology-driven firm is building a next-generation Identity and Access Management (IAM) capability to underpin its global infrastructure. They are seeking a skilled DevSecOps Engineer with deep Linux expertise and a security-first mindset to play a critical role in designing and deploying this new authentication and authorization platform. You will join a newly established security engineering function and take ownership of foundational elements of a greenfield IAM architecture. This role involves full lifecycle responsibility — from design and implementation to operationalisation — of secure identity systems and automated infrastructure components. Required Skills & Experience Strong background in systems or security engineering within Linux-centric environments Expert-level understanding of IAM concepts and architecture Hands-on experience deploying and managing HashiCorp Vault (preferably from scratch) Familiarity with Kerberos, LDAP, and other secure authentication mechanisms Experience with containerised environments and automation tooling (e.g. Terraform, Ansible) Excellent problem-solving, documentation, and collaboration abilities Degree from a top-tier institution in a relevant field (Computer Science, Engineering, etc.) Desirable Exposure to high-performance or low-latency environments Prior experience in financial services or trading environments Familiarity with Zero Trust Architecture (ZTA) principles