Julien I

Odoo VAT and Spanish Tax Compliance Specialist

Upwork • Freelance

May 2021 - Present • 5 yrs

Businesses using Odoo in Spain regularly encounter problems when VAT IVA configuration, fiscal positions, or invoicing structures are not properly set up. The result is incorrect tax calculations, inconsistent reports, rejected invoices and systems that do not meet Agencia Tributaria requirements. Most companies I work with arrive after experiencing filing errors, invoice inconsistencies or a setup that was never aligned with Spanish tax law from the start. I configure complete Odoo accounting environments built specifically for Spain, Spanish fiscal localization, PGCE chart of accounts, IVA and IRPF tax setup, fiscal positions, and all key Modelo tax reports including Modelo 303, 347, 349, 390 and 111. I implement VeriFactu with full digital certificate integration, QR code generation, electronic signature configuration, and complete transition from test environment to production servers, ensuring every invoice issued is legally valid and transmitted to AEAT in real time. For companies above the €6 million threshold, I configure SII so invoice data reaches the Tax Agency automatically within the mandatory 4-day window. For businesses in the Basque Country or Navarra, I handle TicketBAI as a fully separate compliant system. All setups include proper invoice archiving aligned with Spain's 4-year legal retention requirement, audit-ready at any point. I also resolve existing issues, VAT miscalculations, invoice generation errors, reporting inconsistencies and incomplete configurations, restoring systems to full accuracy and compliance. BUSINESS IMPACT Delivered accurate IVA configurations that eliminated tax calculation errors across multiple businesses. Helped companies transition from non-compliant setups to structured, audit-ready environments. Ensured smooth quarterly filings, zero rejected invoices and full alignment with Agencia Tributaria standards.

Odoo ERP Implementation & Migration Consultant

Odoo

May 2018 - Present • 8 yrs

Businesses investing in Odoo ERP expect streamlined operations, accurate reporting, and automated workflows, but often end up with poorly configured systems, broken module connections, inconsistent data, and workflows that do not reflect real business processes. I work with companies facing failed Odoo installations, incomplete module configuration, disconnected CRM, Sales and Inventory workflows, duplicated PostgreSQL database records, user access conflicts, server misconfiguration, integration failures, and unstable migrations causing data loss and performance issues. My expertise covers end-to-end Odoo ERP implementation, installation, migration, and optimization across Odoo Community and Enterprise environments. I handle full server deployment on cloud and VPS infrastructure including domain setup, SSL security, PostgreSQL database management, server optimization, backups, and production-ready configuration for stable and scalable systems. I deliver complete module configuration and workflow setup across CRM, Sales, Inventory, Purchase, Accounting foundations, Manufacturing MRP, and user access control, ensuring proper integration, workflow automation, and accurate reporting across departments. I also manage Odoo version migrations from v14, v15 and v16 to v17, v18 and v19, including database migration, module compatibility validation, dependency resolution, data integrity checks, and post-migration stabilization to prevent downtime and system failures. Additionally, I specialize in troubleshooting, bug fixing, and recovery of failed implementations by resolving module conflicts, fixing broken workflows, correcting misconfigurations, and optimizing system performance for long-term scalability.

Odoo eCommerce and Sales System Integration Specialist

Freelancer.com • Part-time

Feb 2019 - Nov 2025 • 6 yrs 9 mos

Many businesses operate with disconnected systems where the website, sales pipeline, and inventory are managed separately. This leads to orders not syncing with stock, payments not reflecting in accounting, missed leads, and manual processes that slow down operations. I work with businesses facing these issues by building fully integrated Odoo eCommerce and sales systems where website, CRM, sales, inventory, and accounting function as one unified workflow. I design and configure complete Odoo eCommerce environments including website setup using the Odoo website builder, theme customization, product catalog configuration, categories, pricing rules, discount structures, SEO optimization, mobile responsiveness, and conversion-focused checkout flows. I implement secure payment gateway integration including Stripe, PayPal, and Redsys for the Spanish market, ensuring reliable transactions, smooth checkout experience, and proper payment validation. On the sales side, I configure full Odoo CRM pipelines including lead capture, opportunity stages, automated follow-ups, sales team assignment, quotation workflows, and customer lifecycle tracking. I connect eCommerce, Sales, and Accounting modules to automate order processing, invoice generation, and payment reconciliation without manual input. I also implement real-time inventory synchronization across website, warehouse, and sales orders, ensuring accurate stock levels, preventing overselling, and improving fulfillment efficiency. For businesses migrating from WordPress, Shopify, or WooCommerce, I handle full data migration including products, customers, and order history while maintaining system integrity and continuity.