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Founding Platform & Security Engineer at Gradient Labs

Join an elite founding team of former Monzo, Pleo, and Google builders as the first Platform & Security Engineer. In this greenfield role, you will architect and secure the only unified AI operations agent built specifically for the high-stakes financial services sector. You'll take complete ownership of scaling a multi-cloud infrastructure and implementing a next-gen security framework against AI-enabled threats. This is a rare opportunity to shape the technical vision of a startup modernizing customer experience in finance while working alongside some of the industry's most respected engineers in a flexible, dog-friendly London office.

About this role

Role overview

As the first platform hire, you will architect and secure a cutting-edge AI agent platform from the ground up. Reporting to the CTO, you will lead the technical vision for global multi-cloud scaling and security. You will bridge the gap between AI innovation and enterprise-grade infrastructure to redefine financial services operations.

About the company

Software

Gradient Labs is a London-based AI startup building a compliant customer operations platform powered by procedural AI agents that automate complex, high‑risk customer support workflows end to end, with an initial focus on regulated industries such as financial services. Its AI agent (Otto) learns company-specific products and processes to reliably and safely resolve a large share of inquiries while providing deep quality control, observability, and safety features (e.g., audit logs, role-based permissions, GDPR compliance, multi‑model support, auto‑QA). Founded in 2023 by Monzo alumni Dimitri Masin, Neal Lathia, and Danai Antoniou, the company has raised venture funding (including a 2025 Series A) and reports customer programs achieving higher CSAT than human agents and significant cost reductions.

What you'll do

What you will do

  • Architect and implement a comprehensive security framework across AWS, Azure, and GCP to protect against both classic and emerging AI-enabled threats.
  • Scale the core platform and AI agent infrastructure to support global deployments while maintaining rigorous application and network security standards.
  • Collaborate with AI engineers to embed security best practices into model training and evaluation, ensuring safe and responsible autonomous agent outcomes.

Who you are

Who this is a fit for

  • At least 5+ years of experience in security engineering with deep expertise in cloud platforms like AWS or GCP and production software in Go and Python.
  • Proven track record of building automated CI/CD security tooling, vulnerability scanning, and managing complex incident response in fast-paced environments.
  • Exceptional communicator capable of explaining complex risk trade-offs to executive leadership and building trust with enterprise customers in regulated sectors.

Why this role

Why this role is remarkable

  • Join an elite founding team of former Monzo, Pleo, and Google builders creating the only unified AI operations agent purpose-built for high-stakes financial services.
  • True greenfield opportunity with significant equity, allowing you to shape the security posture and infrastructure vision for a company modernizing a multi-billion dollar industry.
  • Tackle unique technical challenges at the intersection of LLM security, automated incident response, and global multi-cloud orchestration for highly regulated enterprise clients.

Jack & Jill

How Jack & Jill work together

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Jill
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