Senior AI Engineer - Platform

Senior AI Engineer - Platform at PhysicsX

Location: London (Hybrid — Shoreditch office + remote)
Seniority: Senior
Employment Type: Full-time
Visa Sponsorship: Available

About PhysicsX
PhysicsX is a deep-tech company with roots in numerical physics and Formula One, building an AI-driven simulation software stack for engineering and manufacturing. Serves aerospace, defense, materials, energy, semiconductors, and automotive sectors.

About the Role
The Platform AI Engineer will build and scale the Agentic stack — the production-grade platform that enables PhysicsX teams to compose advanced AI workflows. You have practical experience running agents in production and understand the failure modes.

Primary Responsibilities:

• Full-Stack Observability: Deep tracing and cost tracking to ensure visibility across the agent lifecycle.
• Deployment Patterns: Tooling for auth, discoverability, resource management.
• Sandboxing Implementation: Secure runtime environments isolating agents.
• Systematic Evals: Feedback loops for domain expert annotation.
• Enterprise Governance: RBAC and OIDC for multi-tenant security.

Required Qualifications:

• 3+ years Platform Engineering, Backend, or SRE experience.
• Python/Go proficiency; Kubernetes, Docker, Terraform expertise.
• Production agentic architecture design experience.
• Familiarity with agentic frameworks and "durable execution" patterns.

Tech Stack:

• Languages: Python (primary), Go or TypeScript (secondary)
• Agentic Frameworks: LangGraph, LangChain, PydanticAI
• Infrastructure: Temporal (durable execution), Pinecone, Weaviate
• Observability: OpenTelemetry, LangSmith, Arize, Braintrust
• Platform: Kubernetes, Docker, Terraform

Bonus Qualifications:

• Engineering workflows or simulation platform background.
• Internal developer platform (IDP) building experience.

Benefits:

• Equity options
• 10% pension contribution
• Free office lunches
• Enhanced parental leave (3 months paternity / 6 months maternity, full pay)
• 25 days annual leave plus public holidays
• Private medical insurance (100% employee coverage)
• Wellhub fitness subscription
• Eye tests, EAP, bike scheme, season ticket loan, EV salary sacrifice