[Hiring] Senior Platform Engineer @Jack & Jill/External ATS

Role 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.

Qualifications

• 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.

Next Steps

• Step 1. Visit our website.
• Step 2. Click 'Talk to Jack'.
• Step 3. Talk to Jack so he can understand your experience and ambitions.
• Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
• Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.
• Step 6. If not, Jack will find you excellent alternatives. All for free.

Company Description

• 9fin.com
• Series C AI platform for debt markets