John Karumba
Senior Software Developer
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About
Senior Full-Stack Engineer with 5+ years delivering scalable ERP solutions, microservices, and fintech integrations.
Proven
Odoo implementation specialist with hands-on experience leading full-cycle ERP deployments across construction, agriculture, and fintech sectors. Expert in Python, JavaScript/TypeScript, Django, Node.js, Angular, PostgreSQL, Docker, Kubernetes, and Azure/AWS. Track record of optimising performance, securing systems, and leading cross-functional teams using Agile/Scrum.
Experience
Senior Software Developer at Setraco Nigeria Limited (via Growth Stack Limited) (2026-01 – 2026-04)
Engineered complex procurement and inventory workflows with multi-stage approvals and integration-ready architecture
- Engineered complex procurement and inventory workflows, including multi-stage approvals, overseas shipment tracking, and warehouse-level stock movements, thus reducing manual processing time and eliminating reconciliation inconsistencies.
- Designed scalable backend logic and data models aligned with microservices principles, enabling seamless integration with external systems and future extensibility.
- Implemented automated business processes and approval pipelines, significantly reducing operational bottlenecks across procurement, finance, and HR workflows.
- Optimised database interactions and ORM usage (PostgreSQL), improving system performance and ensuring reliable handling of high-volume transactional data.
- Built an integration-ready architecture that supports asynchronous data exchange patterns and enables future adoption of messaging systems (e.g., RabbitMQ).
- Translated complex regulatory requirements (VAT, PAYE, WHT, pension) into system-driven workflows, ensuring compliance and reducing financial reporting errors.
- Diagnosed and resolved critical system-level issues (view validation, ORM inconsistencies, database constraints), ensuring system stability during deployment.
Senior Software Developer at One Acre Fund (2023-10 – 2025-11)
Architected Odoo ERP–Apache Fineract microservices integration and led full SDLC for ERP modules serving 2000000+ records
- 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 2000000+ records; deployed custom modules (POS) for 2000+ users across multiple countries.
- Optimised 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 architectural diagrams and API docs, reducing team onboarding time by 40%.
- Mentored junior developers via code reviews and pair programming; delivered user training, achieving 90%+ adoption.
Full-Stack Software Developer at Inkomoko (2021-06 – 2023-10)
Built 8+ custom Odoo/Django/PostgreSQL ERP modules for multi-country operations
- 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.
Software Developer at Counter1Serve (2020-08 – 2021-02)
Built multi-user loan management system with approval workflows and financial reporting
- Built a multi-user loan management system with approval workflows and financial reporting using Angular/Django/PostgreSQL.
- Implemented secure authentication, RBAC, compliance features, and data visualisation modules.
Software Developer at TIFA Research (2020-01 – 2020-07)
Developed media transcription and cost-tracking platform processing 100+ hours of content monthly
- Developed media transcription and cost-tracking platform processing 100+ hours of content monthly; maintained 98% uptime.
Software Developer (Contract) at Agency254 (2019-09 – 2020-01)
Built Python data extraction and automated reporting scripts; designed and maintained responsive WordPress sites
- Built Python data extraction and automated reporting scripts; designed and maintained responsive WordPress sites.
Education
Software Engineering in Full-Stack Development – Moringa School (2019 – 2019)
Bachelor of Science in Mechatronics Engineering – Dedan Kimathi University of Technology (2013 – 2018)
