Senior Python Engineer

Ai Lean is an early-stage B2B SaaS company building critical collections and delinquency infrastructure for the self-storage industry. The Senior Python Engineer will design and maintain software systems that automate complex workflows, ensuring compliance and operational efficiency for clients across the U.S. and Canada.

Responsibilities:

• Temporal workflow definitions for the lien compliance lifecycle — state transitions, human-in-the-loop approval gates, activity retries, workflow versioning for in-flight migrations
• FastAPI service layer exposing shared business logic via HTTP — audit trail, fee validation, FMS sync endpoints, Next.js pages, persona-specific UI flows
• FMS integration abstraction layer and partner-agnostic interface, raw data persistence, field-level variance detection
• Compliance reconciliation engine to validates FMS sync output before it enters any workflow; your code is the last gate before a legally invalid notice gets dispatched
• PostgreSQL schema design and append-only compliance event tables, audit trail permanence, sync run logging
• Persona-driven interfaces - Site Manager, District Manager, Owner/Operator, Ops Admin, and Workflow Config views are purpose-built, not filtered versions of a shared view