Fluidstack
Software Engineer, Ontology
$224K–$279K
San Francisco, CA +2 · On-site · Full-time · Posted Aug 29, 2026
- Location
- San Francisco, CA
New York, NY
Austin, TX
About the job
Builds a foundational ontology and data platform that connects Fluidstack’s operational information and provides timely, authorized, evidence-backed business signals and answers.
What you'll do
- Build an index and graph engine for operational data, documents, and conversations; define shared entities, relationships, and identity rules.
- Detect meaningful changes and publish signals when observed conditions diverge from plans.
- Provide fast, authorized queries with provenance and freshness, and measure latency and answer and signal quality.
What they ask for
- Experience building and operating foundational data systems used by multiple teams for decisions or critical workflows.
- Experience integrating heterogeneous data sources into a coherent, extensible model.
- Experience turning continuous changes into timely, reliable operational signals.
- Experience working with domain experts and making production-informed tradeoffs among correctness, freshness, query speed, and access control.
Nice to have
- Temporal data models, search and retrieval over unstructured data, or database/indexing internals.
- Formal ontology or semantic web standards, or physical infrastructure/inventory systems.
Pay
$224K – $279K USD base salary
Tools
Datomic, EAVT, RDF, OWL, SHACL, SPARQL
AI focus
Build a secure platform for agents to query business information within user permissions, with answers traceable to sources, freshness, and evidence gaps.
Model-written summary · the original posting is authoritative