Remote Senior Platform Engineer at 9fin.com in Edinburgh

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network The next step is to speak to Jack . Job Title: Senior Platform Engineer (DevSecOps) Company Description: 9fin.com - Series C AI platform for debt markets Job Description: Join 9fin's high-seniority Platform team to lead the security function from the ground up. You will design and implement the automated guardrails, policy-as-code, and secure-by-default systems that allow engineers to move fast while protecting a platform used by 300+ blue-chip institutions across the $145 trillion global debt market. Location: Remote, UK Why this role is remarkable: Opportunity to build a security function from a "cold start," defining the standards, tooling, and culture for a unicorn-stage fintech. 9fin just closed a $170M Series C at a $1.3B valuation, providing massive growth trajectory and stability with 300+ institutional clients. Work in a high-autonomy, low-ego environment within a senior Platform team that functions as an internal product group rather than a ticket-based service. What you will do: Design and implement automated security guardrails across a multi-account AWS environment using Terraform and policy-as-code. Build and maintain secure CI/CD pipelines in GitHub Actions, including secret scanning, dependency analysis, and build integrity checks. Partner with the Head of InfoSec to translate SOC 2 compliance requirements into pragmatic, engineering-led platform features and automated gates. The ideal candidate: Proven experience owning or significantly improving cloud security posture, ideally building security functions from scratch in a startup/scale-up environment. Expert-level proficiency with AWS, Infrastructure as Code (Terraform), and modern application security patterns like decentralized authentication. Strong communicator who can balance security requirements with developer experience to influence engineering teams across the entire organization. Who are Jack