John Luther Mascarinas

About John

I build and run business systems for US and UK companies, with 7+ years of remote experience since 2019. I help business owners replace manual work with one reliable system their team can use for years. What I do: 1. Odoo ERP development (Python, XML, CRM, POS, invoicing). 2. Shopify and WooCommerce development (Liquid, GraphQL API, migrations). 3. Payment integrations (Authorize.net). 4. AWS, Docker and Linux server administration. 5. Automation with Node.js, APIs, GoHighLevel and Klaviyo. Results: 1. Migrated a 6,177-product store with zero duplicates Fixed an email bug affecting 8,000 of 11,000 customer emails. 2. Found $14,000 in pricing corrections with Power BI Daily end-of-day reports. Available for long-term work in US, UK and AU hours. Portfolio: johndeveloperwfh.github.io

Skills

Experience

• Full Stack Developer and Systems Specialist with 7+ years of remote experience since 2019, building and running production systems for US and UK businesses across ERP development, e-commerce engineering, payment integrations and cloud infrastructure.
• I help business owners replace scattered tools and manual work with reliable systems their teams use for years: custom Odoo 17 modules, Shopify and WooCommerce pipelines, Authorize.net integrations and Dockerized AWS infrastructure.
• Known for root-cause debugging, backup-first deployments, clear daily reporting and owning systems end to end without a development team behind me.