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Hi, I'm Walter Okumu 👋

Full-Stack Engineer & Tech Lead
📍 Nairobi, Kenya · 📧 okumu.oriaro@gmail.com · 🌍 Remote-friendly · Open to freelance projects


🚀 About Me

I build fast, scalable web systems for growing businesses — from frontend to cloud deployment.

For the past 4+ years at Yellow Pages Group, I've led a 15-person team across Kenya, Cape Verde, and Mozambique — delivering full-stack platforms, AI-powered automations, and infrastructure that runs reliably at scale. I work at the intersection of engineering and business: I don't just write code, I understand what the system needs to do for the people using it.

Currently available for freelance projects and fractional technical leadership engagements.


🏆 Impact & Highlights

  • Migrated 7 country websites from Drupal to Next.js — 20% faster page loads, improved SEO across all markets
  • Built a multi-tenant procurement system adopted by 50+ branches across East Africa
  • Scaled an Ollama-powered AI chatbot to serve 10,000+ monthly queries
  • Deployed a headless eCommerce platform with M-Pesa Express checkout — 40% faster transactions
  • Implemented a CI/CD pipeline using GitHub Actions + Docker — 30% reduction in deployment errors
  • Mentoring full-stack developers at Microverse since 2022

🛠️ Tech Stack

Frontend
Next.js React TypeScript Tailwind JavaScript

Backend
Node.js GraphQL PostgreSQL MongoDB Express

DevOps & Cloud
AWS Docker Linux GitHub Actions


📂 Featured Projects

Project Description Stack
Procurement Tool Multi-tenant request management with SSH-tunnel & Row-Level Security on Postgres — serving 50+ branches Next.js · PostgreSQL · Node.js · Docker
Headless eCommerce Next.js + Headless WordPress store with M-Pesa Express integration Next.js · TypeScript · M-Pesa API · WordPress
AI Chatbot Workflows Ollama + LangChain automations for custom LLM pipelines — 10K+ monthly queries Ollama · LangChain · Node.js · PostgreSQL
Digital Signage Dashboard Real-time analytics & content management for Rhodium Digital Signage Next.js · WebSockets · PostgreSQL

📈 GitHub Stats

My Awesome Stats


🎯 What I'm Working On

  • Building a website audit tool powered by AI — runs Lighthouse + generates plain-English recommendations
  • Contributing to open source projects in the Next.js and Node.js ecosystem
  • Available for: Next.js development, Node.js APIs, CI/CD & DevOps setup, M-Pesa integrations, monthly retainer care plans

🤝 Let's Work Together

If you need a senior engineer who can build, lead, and deliver — reach out.

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"I build tools that empower teams to do more, faster."

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