Senior Backend / Platform Engineer
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Before you apply
LocationMadrid
Work modeon-site
Typefull-time
SenioritySenior
Experience3+ yrs
DepartmentENGINEERING
Company size11–50 people
PostedMay 4, 2026 · 6mo ago
Verified live1d ago
May no longer be actively hiring
Posted by the company on May 4, 2026
At a glanceSummarised by Seekless from the posting.
3+ years experience with Python and/or TypeScript in production
5+ years designing backend platforms for production systems
Strong systems design skills
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
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
Skills
Python
TypeScript
PostgreSQL
Cerbos
OPA
Cedar
Kurrent
Redpanda
Kafka
About the role
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.
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PII Vault & GDPR compliance — Isolated, encrypted storage for personal data. Right to erasure. Data residency per region.
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Multi-tenancy — Row-level security, tenant isolation across all data stores, tenant-scoped LLM API keys.
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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:
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.