You'll own the platform our agents run on — event-driven architecture, data pipelines, integrations with customer accounting systems, and the infrastructure that makes everything reliable, auditable, and fast. What you'll do • Event store — Append-only PostgreSQL with tamper-evident hash chaining, real-time event distribution, agent replay and recovery, schema versioning. • Cryptographic signature infrastructure — Key management, signature verification on all agent events, approval chains for external actions. • Workflow Constraint Engine — The gateway that verifies authorization before any external action (email, payment, API call) proceeds. • PII Vault & GDPR compliance — Isolated, encrypted storage for personal data. Right to erasure. Data residency per region. • Multi-tenancy — Row-level security, tenant isolation across all data stores, tenant-scoped LLM API keys. • Authorization (Cerbos) — Attribute-based access control for agents and humans. Deterministic policy evaluation — LLMs never make auth decisions. • MCP security layer — Authentication, capability-based scoping per partner, and rate limiting for the Model Context Protocol endpoint. • Database architecture — PostgreSQL schema design, indexing strategy, performance tuning, read replica topology. What we're looking for • 3+ years experience with Python and/or TypeScript in production. • 5+ years designing backend platforms for production systems. • Strong systems design skills — this is the primary requirement. You think in boundaries, contracts, failure modes, and scaling characteristics. • Deep PostgreSQL knowledge — RLS, indexing tradeoffs, event sourcing patterns, schema evolution. • Strong application security architecture skills: encryption models, key management, auth patterns. • Experience with policy-as-code authorization (Cerbos, OPA, Cedar, or similar). • Strong code review skills for security-sensitive AI-generated code. • Nice to have: • Cryptographic primitives in production (digital signatures, hash chaining, application-layer encryption). • Event streaming platforms (Kurrent, Redpanda, Kafka). • SOC 2 or GDPR compliance engineering. • Fintech or regulated-environment background.