Senior Software Engineer, Identity Graph

ABOUT BASELAYER Every business in America needs a bank account to exist. The system that decides whether they're real, who's behind them, and whether they're a risk, runs on infrastructure from the 1980s. We're rebuilding that layer from scratch. Baselayer is the identity layer for institutions across the United States — the most complete business graph in America and every human tied to it. We fuse public records, IRS data, sanctions lists, web signals, and fraud telemetry from 2,200+ financial institutions into a single graph that resolves any business and the humans behind it in milliseconds. The legacy credit bureaus took 50 years to build something that gets 60% match rates. We've built something that gets 98% in under two years. Today we're trusted by over 20% of financial institutions in America — including FIS, Rho, Socure and leading loan infrastructure providers. But the graph is becoming infrastructure for anyone who needs to know if a business is real and worth trusting: gig platforms, marketplaces, AI companies, and commerce infrastructure at scale. Trust is the substrate of every financial transaction. We're rebuilding it. ABOUT THE TEAM We're solving real-time entity resolution at a scale no one else has cracked — fusing dozens of data sources into a single business identity graph and resolving any entity in milliseconds. It's a graph AI problem, a retrieval problem, and a fraud-modeling problem stacked on top of each other. The technical depth is real. You'd be joining a small team where the data moat is defensible, the research problems are open, and the infrastructure you build becomes load-bearing for businesses. Ownership is real. Velocity is real. There's no layer of process between an idea and shipping it. We're at an inflection point — the graph is built, the match rates speak for themselves, and the hardest problems are still ahead: graph embeddings, fraud propagation models across the business network, real-time traversal at sub-100ms latency, and expanding the identity layer beyond finance into every platform that needs to trust a business. If you want to work on something foundational — the kind of infrastructure that gets built once, and everything else runs on top of — this is it. ABOUT THE ROLE 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. WHAT YOU'LL DO • 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. MINIMUM 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. WHAT SETS YOU APART • 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. WORK LOCATION • Based in SF; hybrid 4 days per week in office. COMPENSATION • Salary Range: $230k – $340k + Equity BENEFITS • Time off when you need it: Flexible PTO so you can recharge without red tape • In-person energy: We're based in SF and meet in the office 4 days a week • Competitive compensation: We pay well and back it with equity. We want you to think and act like an owner • Career rocket fuel: You'll help build the foundation of a high-growth startup, working side by side with experienced founders and team members who've done it before • Benefits on us: We cover 100% of your health, dental, and vision premiums. No surprise deductions from your paycheck • 401(k) with company match: We match your contributions so your future self benefits too • HSA contributions included: We contribute to your HSA on applicable plans, so your coverage works as hard as you do • Stay healthy, stay sharp: A $250 monthly gym stipend to help you bring your best self to work, and everywhere else • A seat at the table: We believe in transparency, radical candor, and giving every team member a voice 🔥