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siimaster.cl

SII Master

Multi-tenant SaaS for Chilean PyME accounting and taxes, with an AI agent (MCP server) that operates the SII under human approval. Reads F29, RCV, Income DJ, and BHE; files SISPAs; issues DTEs (MIPYME folios and traditional CAF); and keeps full accounting (journal entries, ledgers, P&L, balance sheet, RLI, F22).

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Client
SII Master
Year
2025-2026
Stack
FastAPI · Python · Postgres (Neon) · MCP · React + Vite · Tailwind · Fly.io

Scope

  • MCP server with 147 tools over SII and PyME accounting, consumable from Claude Desktop / Claude Code
  • Live SII reads: F29 + observations (PPM/IVA/RET), RCV, Income DJ, BHE, tax profile
  • Human-in-the-loop SII writes: BHE annulment, end-to-end SISPA, DTE issuance
  • Full PyME accounting: chart of accounts, auto journal entries, ledgers, P&L, balance sheet, RLI, F22
  • Multi-tenant SaaS with plans, invites, and Chilean payments (Khipu/Webpay/Flow/Mercado Pago)
  • Postgres on Neon, deployed on Fly.io, 1,430 automated tests

Outcomes

  • MCP in production, operable as an accountant agent from Claude
  • First official electronic invoice issued via MIPYME (CLP 4,475,590)
  • Late-filing F29 SISPAs presented end-to-end from the agent
  • Multi-tenant architecture with per-entity encrypted file storage (Fernet)

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