Odoo 18 Portugal Accounting Integration

I am migrating our entire finance and sales stack from Cegid to Odoo 18 and need an expert who already speaks the language of Portuguese accounting. The goal is simple: once your work is finished every invoice, expense, payroll run and sale—whether it starts in-store, through our website or over WhatsApp—must flow through Odoo in full compliance with the Autoridade Tributária.

Key areas you will configure
• Government-ready invoicing: automatic ATCUD and QR-code generation, SAF-T (PT) export, certified billing sequence, and e-Invoice / eFatura submission.
• Expense tracking that posts to the correct Plano de Contas and follows Portuguese VAT rules.
• Payroll processing with legal categories, Segurança Social, IRS tables and electronic payslip files.
• Online sales integration (Odoo Website + e-commerce) so orders create fiscal documents instantly.
• Client communication channels inside Odoo (Email, Phone, WhatsApp) linked back to each partner record.
• Inventory management fully tied to accounting for real-time COGS and stock valuation.

Acceptance criteria
– Test invoices clear the AT validation portal without errors.
– SAF-T files import successfully into the government test tool.
– A sample payroll run nets identical results to the one produced in Cegid.
– Legacy master data (customers, suppliers, products, chart of accounts) is migrated and reconciled.
– All modules run in Portuguese with currency, tax and fiscal positions pre-set.

You may bring your own preferred development environment, but I expect the final setup to live in a clean Odoo 18 Community build (Docker or native) and to be delivered with a short hand-over manual plus reproducible backup.