Principal Software Engineer, Safety Foundation
$295,250–$345,040 year
On-siteSan Mateo, California, United States
Job Summary
Principal Software Engineer on Safety Foundation: hands-on tech lead responsible for setting technical direction and architecture for a scalable, cost-efficient platform designed to handle 10x traffic growth. Drive AI-first transformation of the safety platform by architecting agentic and ML-integrated workflows with security, auditability, and reliability. Build the developer experience layer to enable product teams to integrate safety capabilities quickly. Collaborate with Trust & Safety ML, User Safety, Safety Operations, and product teams to translate needs into durable infrastructure. Define backend standards, raise technical bar through code reviews and mentorship, and identify/performance bottlenecks across networking, data, and compute at scale.
Required Qualifications
- 8+ years of experience building large-scale backend/distributed systems and shipping high-quality systems to production
- 4+ years acting as a tech lead: setting direction, driving execution, and growing engineers at multiple levels
- Deep proficiency in Go or a similar compiled language (Go strongly preferred)
- Experience with NoSQL databases at scale (DynamoDB, Cassandra, or similar)
- Experience with or strong interest in AI/ML platform integration — pipelines, agentic workflows, HITL workflows or similar
- BA/BS in Computer Science, Engineering, or a related technical field — or equivalent experience
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