Open to opportunities

donald madangure

@donaldmadangure

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Fullstack engineer specializing in AI integrations, real-time systems, and secure identity solutions.

Zimbabwe

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What I'm looking for

I seek roles building AI-integrated, real-time web products with strong security practices, collaborative teams, and opportunities to own system design and performance improvements.

I am a Fullstack Engineer focused on integrating AI and building real-time, secure web applications using Next.js, React, Convex, Clerk, and modern backend stacks. I have built voice-activated AI products with Vapi and Llama-based models, engineered robust data pipelines to prevent LLM hallucinations, and optimized systems to halve AI response latency.

As a freelance developer I design secure authentication systems (JWT, HttpOnly cookies, RBAC), real-time messaging engines with sub-100ms delivery, and resilient database architectures using Convex and PostgreSQL. I prioritize reliability, security, and performant user experiences, delivering production-ready solutions and clear, maintainable code.

Experience

Work history, roles, and key accomplishments

AI Integration Specialist

Personal Projects

Developed a real-time, voice-activated AI nutrition and fitness coach using Vapi and Groq (Llama 3.3), halving AI response latency and enforcing schema-validated AI outputs to eliminate hallucinations.

VAPI Groq (Llama 3.3)Voice AI Vector Databases Convex Clerk API Security Real Time Systems

Fullstack Engineer

Freelance

Built full-stack applications with secure authentication and real-time systems, including a custom JWT auth system with HttpOnly cookie storage and a sub-100ms Socket.io messaging engine that improved message delivery performance.