Open to opportunities

John Karumba

@johnkarumba

Full-stack developer with 6+ years scaling secure web apps; I build production-grade APIs, dashboards, and cloud-ready systems.

Kenya

Message

What I'm looking for

I’m looking to build secure, high-performance web platforms end-to-end—APIs, frontend, and infrastructure —using modern JS/Python stacks, cloud/CI/CD, and strong engineering practices, with room to lead, mentor, and ship reliably.

I’m a Fullstack Software Developer with 6+ years building and scaling web applications across frontend and backend. I translate complex requirements into clean, production-grade code, and I’m hands-on with designing secure RESTful APIs and high-traffic system performance.

In my recent roles, I’ve engineered end-to-end procurement, inventory, and ERP integrations using Node.js/FastAPI, Python, and PostgreSQL, including RabbitMQ-compatible async patterns. At One Acre Fund, I led full SDLC for ERP modules, optimized backend APIs and database queries for 500+ concurrent users, and implemented Redis-backed caching to improve response times.

I also focus heavily on security, reliability, and team effectiveness—building Keycloak SSO with OAuth 2.0 and RBAC, containerizing services with Docker, and owning CI/CD pipelines with GitHub Actions. I lead code reviews, mentor junior developers, and support quality through automated PyTest/Selenium test suites.

Experience

Work history, roles, and key accomplishments

Senior Software Developer

Setraco Nigeria Limited (via Growth Stack Limited)

Jan 2026 - Apr 2026 (3 months)

Engineered procurement and inventory workflows with multi-stage approvals and shipment tracking using a Node.js/FastAPI backend. Designed scalable RESTful APIs and optimised PostgreSQL/ORM usage for high-volume transactional data.

fastAPI RESTful APIs PostgreSQL RabbitMQ Compatible Async Patterns Procurement Systems

Senior Software Developer

One Acre Fund

Oct 2023 - Nov 2025 (2 years 1 month)

Architected Odoo ERP to Apache Fineract integration using secure REST APIs and RabbitMQ, handling 2,000,000+ records. Led full SDLC for ERP modules and improved API/database performance and security using Redis caching and Keycloak SSO with OAuth 2.0/RBAC.

Odoo Apache Fineract REST APIs RabbitMQ Python PostgreSQL Angular CI CD GitHub Actions Pytest Selenium Docker Redis Keycloak OAuth 2.0 RBAC API Documentation

Full-Stack Software Developer

Inkomoko

Jun 2021 - Oct 2023 (2 years 4 months)

Built 8+ custom full-stack modules (Payroll, Accounting, HR) for multi-country operations using Django, PostgreSQL, and Vue.js/Angular. Implemented REST API integrations and real-time dashboards while optimising multi-database performance through indexing and query tuning.

Django PostgreSQL Vue.Js Angular API Integration Dashboards Indexing

Software Developer

Counter1Serve

Aug 2020 - Feb 2021 (6 months)

Built a multi-user loan management system with approval workflows, RBAC, and data visualisation using Angular, Django, and PostgreSQL. Implemented secure authentication and compliance features.

Angular Django PostgreSQL Loan Management RBAC Authentication & Compliance data visualisation

Software Developer

TIFA Research

Jan 2020 - Jul 2020 (6 months)

Developed a media transcription and cost-tracking platform processing 100+ hours of content monthly. Maintained 98% uptime for the platform.

Transcription Cost Tracking Uptime Reliability

Software Developer (Contract)

Agency254

Sep 2019 - Jan 2020 (4 months)

Built Python data extraction and automated reporting scripts and designed/maintained responsive web applications. Supported delivery of automated reporting and web-based functionality.

Python Data Extraction Report Automation Responsive Web Applications