Senior Software Engineer, Identity Graph

Baselayer•San Francisco, CA

1d•$135,000 - $220,000•Hybrid

About The Position

Baselayer is building the most comprehensive, accurate, and continuously-current identity graph of US businesses and consumers. Every entity, officer, address, relationship, and public record we can responsibly source - ingested, normalized, linked, and kept fresh. That graph powers fraud detection, KYB onboarding, portfolio monitoring, sanctions screening, and a growing surface of customer-facing API products. We're hiring a senior engineer to own product features across that surface end-to-end: schema design, data ingestion, entity resolution, API endpoints, scope and multi-tenancy, and performance under real customer load.

Requirements

Shipped product features that touched ingestion to storage to API to customer, end-to-end, in production.
Owned a Postgres schema that real money or real decisions depended on, and stayed on top of its evolution.
Strong async Python with experience running async services at scale.
Deep Postgres expertise: schema design under live load, EXPLAIN ANALYZE as a reflex, zero-downtime migration tooling.
FastAPI (or close equivalent): shipped real APIs with auth dependencies, OpenAPI contracts, and structured response models.
Built multi-tenant APIs where access control is load-bearing and scoped correctly at the data layer.

Nice To Haves

Entity resolution / record linkage / fuzzy matching at scale.
Search infrastructure - full-text, fuzzy, or vector - kept in sync with a Postgres system of record.
KYC/KYB/fraud/underwriting data-pipeline experience.
Address parsing/normalization at country scale.
Webhook delivery infrastructure: retries, signing, idempotency, and ordering guarantees.
GCP experience with Cloud Run, Cloud Tasks, Cloud SQL, and batch pipelines.

Responsibilities

Ingest and normalize heterogeneous public records into the graph, owning the full pipeline: ingestion to normalizer to repository to API surface.
Build and maintain entity resolution and linking systems - matching the same business or person across sources where keys don't line up, names are misspelled, and addresses are formatted six different ways.
Design and ship customer-facing APIs for search, lookup, monitoring, and webhook delivery - built for engineers who'll be live in production within a day of signing up.
Own schema design and zero-downtime migrations on a database hot 24/7.
Optimize performance and scale: query patterns for 10x volume, ingestion pipelines that finish before the next batch arrives, API latencies that don’t drift as the graph deepens.
Build multi-tenancy and access control: every query in the system scoped by org/user/permission at the data layer.