John Karumba Gachegua

Architected Odoo ERP–Apache Fineract microservices integration via REST APIs and RabbitMQ, cutting financial reconciliation time by 60%. Led full SDLC for ERP modules (Sales, Inventory, CRM) serving 20,000+ records; deployed 8+ custom modules (Payroll, HR, Procurement) for 200+ users across multiple countries. Optimized backend APIs and queries, improving response times by 35% for 500+ concurrent users. Implemented CI/CD pipelines (GitHub Actions) and automated PyTest/Selenium test suites, reducing defects by 30–40%. Integrated Keycloak SSO and RBAC, enhancing security and reducing support tickets. Produced architecture diagrams and API docs, shortening team onboarding by 40%. Mentored junior developers via code reviews and pair programming; delivered user training achieving 90%+ adoption.

Built 8+ custom Odoo/Django/PostgreSQL ERP modules (Payroll, Accounting, HR) for multi-country operations. Developed REST API integrations with external systems, improving data accuracy by 50%. Designed real-time dashboards and workflow automation for operational insights; established team coding best practices.

Built multi-user loan management system with approval workflows and financial reporting using Angular/Django/PostgreSQL. Implemented secure authentication, RBAC, compliance features, and data visualization modules.