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Senior Platform Engineer (AI Security Infrastructure)

refractal • United Kingdom
Visa Sponsorship
This Job is No Longer Active This position is no longer accepting applications
AI Summary

Own the end-to-end platform architecture for Refractal’s Security Context Graph, designing APIs, SDKs, and operator tools to enable secure AI agent deployments. Focus on multi-tenant security, real-time observability, and customer integrations while shaping technical standards and product roadmaps. Requires deep expertise in backend systems, authentication, and high-assurance data modeling.

Key Highlights
End-to-end ownership of platform APIs, SDKs, and operator dashboards for AI security infrastructure
Design and implement multi-tenant security, authentication, and auditability for high-assurance environments
Collaborate directly with founders and early customers to translate operational needs into scalable technical solutions

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Key Responsibilities
Design and maintain the core platform APIs and SDKs, ensuring stable versioning, clear documentation, and compatibility
Build FastAPI services for authentication, multi-tenant isolation, and real-time event interfaces (SSE, audit ledger)
Develop customer onboarding flows, policy integration tools, and operator dashboards for security teams
Define and enforce engineering standards for APIs, SDKs, and customer-facing quality assurance
Work closely with customers to translate operational security needs into reliable platform interfaces
Own the build, test, and deployment pipeline, including API compatibility testing and cloud infrastructure (Cloud Run, Cloud SQL)
Technical Skills Required
Python FastAPI PostgreSQL

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Benefits & Perks
Competitive salary and performance-linked bonus
Meaningful founding equity
Direct influence over product and company direction

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Nice to Have
Experience with AI security or high-assurance systems
B2B/enterprise integrations with trust/auditability/compliance requirements
Open-source contributions demonstrating engineering decisions and product judgment
Experience with real-time data-dense systems (e.g., security consoles, observability tools)

Job Description

About Us

Refractal is building security infrastructure for autonomous systems. Tomorrow’s attacks will use adaptive reasoning agents; cyber defenders need the right tools for adaptive defence. Refractal builds the Security Context Graph, which allows defenders to reason more effectively about risk and enforce controls.

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Job Overview
Posted Aug 13, 2026
Employment Full-time
Experience Entry level
Location United Kingdom
Category Programming
Company refractal
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