Senior Core Technologies Engineer
Core
Senior engineer responsible for scaling Elasticsearch and core infrastructure to support Fin's AI customer agent platform for billions of users.
Role type
Senior Core Technologies Engineer (Infrastructure/Backend)
Builds
Scalable Elasticsearch clusters, MySQL databases, ingestion pipelines, and the underlying platform for Fin's AI agents.
Domain
SaaS / Customer Support / AI Infrastructure
Deliverable
production ML models | infrastructure
Required skills
Elasticsearch (index design, clustering, performance tuning), MySQL, Linux, distributed systems architecture, backend development, observability, technical leadership.
Preferred skills
SaaS scaling experience, multi-quarter project leadership, mentoring engineers.
Technologies
Elasticsearch, MySQL, Memcached, Rails, Linux, Claude Code.
Responsibilities
Own high-impact work on Elasticsearch at scale including index design and performance tuning; collaborate on technical direction and infrastructure; write application code and automate systems; raise technical standards for reliability and performance; mentor other engineers.
Seniority
Senior, hands-on IC with strategic enablement