Build and maintain a production‑grade email protection platform that processes email events in near real‑time, integrates multiple detection engines, and executes policy‑driven actions across major email providers. Responsible for backend system ownership, data flow correctness, and long‑term stability of security‑critical services while collaborating closely with DevOps and other cross‑functional teams.

• Work with Rspamd as a core detection engine.
• Consume scores, symbols, metadata, and verdicts to drive policy decisions.
• Apply email security fundamentals, including DKIM, SPF, DMARC, header, and MIME analysis.
• Evolve support for multiple scanners and signal sources.
• Build and maintain high‑throughput services in Go.
• Work with Redis Streams or queue‑based pipelines, ensuring ordering, retries, idem...