Donald Kagunila is a software engineer in Tanzania specialising in backend and API architecture, financial technology and SaaS product development — working across TypeScript, Node.js, NestJS, React, Next.js, Java, Spring Boot, PostgreSQL, Redis and Docker.
Enterprise financial software where correctness, security and auditability come first — digital lending workflows, payment and third-party integrations, authentication and audit trails.
Where: Senior Software Developer on enterprise digital lending infrastructure.
Designing backend services and APIs that stay maintainable as they grow: clear domain boundaries, event-driven processing, integration patterns and observability.
Where: Distributed services in banking; NestJS service design for SaaS products.
Multi-tenant platforms built end to end — tenant isolation, provisioning, role-based access across organisations and per-tenant configuration — designed so one product serves many customers.
Where: Co-founder and director of Afrevo Company Limited, building SaaS products.
Choosing the simplest architecture that meets real constraints: modular monoliths or microservices, data models, consistency trade-offs and integration boundaries.
Where: Architecture across enterprise banking systems and independent products.
Shipping and operating software: containerisation, reverse proxying and TLS, CI/CD pipelines and Linux server administration.
Where: Containerised deployments for Afrevo products and this website.
Using AI coding tools inside a disciplined engineering workflow — with code review, testing and clear ownership — to move faster without lowering the quality bar.
Where: Part of day-to-day engineering practice.
The technologies I reach for by default — chosen for reliability, ergonomics and how well they scale with a small team.