# Senior Backend / Platform Engineer - Company: [Causaprima]() - Location: Madrid · Munich - Team: ENGINEERING - Employment type: Full Time - Posted: May 4, 2026 ## Job description 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. ## Apply [Apply on Causaprima]() Canonical job page: