Worked on the Ecwid/ecwid-java-api-client repository over a two-month period, focusing on backend and API development using Kotlin. Delivered a customer-facing data retrieval feature that enables support teams to access a customer’s most recent order by email through a streamlined API call, improving workflow efficiency and traceability. Extended the data model to support electronic invoicing by adding PEC email, SDI code, and commercial relationship fields, as well as new tax data fields for accurate reporting and compliance. Prioritized maintainability and clear commit history, ensuring that enhancements integrated smoothly with existing systems and supported evolving business and regulatory requirements.