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Available for freelance

Ibuildwebsystemsthatscale.

Full-Stack Engineer & Tech Lead · Nairobi, Kenya

I help growing businesses build fast, reliable web platforms — from Next.js frontends to cloud infrastructure and everything in between. 4+ years delivering production systems across East Africa and beyond.

Experience
4+ Years
Team Led
15 People
Countries
7
Portrait of Walter Okumu
About Me

Engineering meets leadership.

I don't just write code — I understand what the business needs and build systems that hold up at scale.

I've spent the last 4+ years at Yellow Pages Group leading web development and customer success across Kenya, Cape Verde, and Mozambique. What started as a web developer role grew into managing a 15-person team spanning graphic design, web development, IT support, QA, and customer success — and I discovered that I'm equally comfortable in architecture discussions and client conversations.

On the technical side, I specialise in Next.js, Node.js, PostgreSQL, and AWS. I've migrated 7 country websites from Drupal to Next.js, built CI/CD pipelines that cut deployment errors by 30%, and deployed an AI-powered chatbot serving 10,000+ monthly queries. I understand both the frontend and the infrastructure that keeps it running.

I'm now available for freelance projects and fractional technical leadership engagements. Whether you need a full application built from scratch, an existing system optimised, or a technical leader who can work with your team — let's talk.

View LinkedIn Profile

40% ↑

Customer satisfaction improvement

30% ↓

Deployment errors reduced

50+

Branches served across East Africa

10K+

Monthly chatbot queries

What I Do

Services & Expertise

Fixed-scope engagements with clear deliverables. No surprise invoices, no moving goalposts.

Web Application Development

Full-stack web applications built with Next.js, Node.js, and PostgreSQL. From architecture to cloud deployment — I handle the full lifecycle.

  • Next.js frontend
  • Node.js API backend
  • Database design
  • AWS deployment
  • CI/CD setup

From KES 60,000 / $500

Performance & SEO Audit

I audit your website against 40+ performance and SEO factors, identify what is costing you rankings and customers, and fix it.

  • PageSpeed audit
  • Core Web Vitals
  • On-page SEO
  • Mobile optimisation
  • Report included

From KES 25,000 / $200

DevOps & CI/CD Setup

Stop deploying manually. I set up your full deployment infrastructure with automated pipelines, Docker, and AWS — so your team ships confidently.

  • GitHub Actions CI/CD
  • Docker setup
  • AWS configuration
  • Staging environment
  • Documentation

From KES 75,000 / $600

Monthly

Monthly Care Plan

Your website investment protected month to month. Updates, monitoring, performance checks, and fast responses to issues — every month.

  • Uptime monitoring
  • 4 content updates
  • Security patches
  • Monthly report
  • Priority support

From KES 8,000 / $65

My Work

Selected Projects

Production systems I've designed, built, and deployed — with measurable outcomes.

Multi-Tenant Procurement System
web-apps

Multi-Tenant Procurement System

Centralised procurement management serving 50+ branches across East Africa with Row-Level Security for multi-tenant data isolation.

Adopted by 50+ branches across 7 countries

Next.jsNode.jsPostgreSQLDockerAWS EC2
Headless eCommerce + M-Pesa
web-apps

Headless eCommerce + M-Pesa

Next.js headless eCommerce platform with M-Pesa Express (STK Push) integration — reducing checkout friction for Kenyan customers.

40% faster transaction completion

Next.jsJavaScriptM-Pesa APIWordPressTailwind CSS
AI Chatbot Workflows
ai

AI Chatbot Workflows

Custom LLM pipeline using Ollama and LangChain for local model inference — serving thousands of monthly queries without cloud API costs.

10,000+ monthly queries served

OllamaLangChainNode.jsPostgreSQLDocker
Digital Signage Dashboard
web-apps

Digital Signage Dashboard

Real-time content management and analytics dashboard for Rhodium Digital Signage — managing content schedules and display health across a network.

Real-time control across multiple display networks

Next.jsNode.jsWebSocketsPostgreSQLAWS
Tech Stack

Tools I work with

The technologies I use daily to build and ship production systems.

Frontend

Next.jsNext.js
ReactReact
JavaScriptJavaScript
Tailwind CSSTailwind CSS
F
Framer Motion

Backend

Node.jsNode.js
Express.jsExpress.js
GraphQLGraphQL
PostgreSQLPostgreSQL
MongoDBMongoDB

DevOps & Cloud

AWSAWS
DockerDocker
GitHub ActionsGitHub Actions
LinuxLinux
N
Nginx

Tools

GitGit
V
Vercel
FigmaFigma
P
Postman
Experience

Where I've worked

A track record of delivering at scale, across borders.

June 2023PresentNairobi, Kenya (Remote — Kenya, Cape Verde, Mozambique)

Head of Customer Success & Web Development

Yellow Pages Group

  • Lead a 15-person multi-discipline team across web development, design, IT support, QA, and customer success
  • Migrated 7 country websites from Drupal to Next.js — 20% improvement in page load speed
  • Implemented CI/CD pipeline with GitHub Actions + Docker — 30% reduction in deployment errors
  • Built a multi-tenant procurement system adopted by 50+ branches across East Africa
  • Scaled an Ollama-powered AI chatbot to serve 10,000+ monthly customer queries
  • Increased customer satisfaction by 40% through code quality and performance initiatives
November 2022May 2023Nairobi, Kenya

Senior Web Developer

Yellow Pages Kenya

  • Migrated core websites from Drupal to ReactJS — 20% improvement in page load speed
  • Designed and implemented a scalable Node.js + PostgreSQL API backend
  • Built and maintained CI/CD pipeline enabling rapid, reliable deployments
February 2014June 2018Nairobi, Kenya (Regional)

East & Central Africa Area Systems Expert

British American Tobacco Kenya

  • Improved employee data accuracy from 40% to 95%+ across East & Central Africa
  • Coordinated data audits across multiple African markets
  • Collaborated with South Africa, Romania, and UK teams on global process alignment
May 2022PresentRemote (International)

Full-Stack Developer (Training) · Mentor (Ongoing)

Microverse

  • Completed 1,300+ hours of full-stack development — React, Redux, Node.js, Ruby on Rails
  • Mastered remote pair programming with international developer teams
  • Ongoing: providing code reviews and technical guidance to junior developers
Let's Work Together

Start a project.

Tell me about your project and I'll get back to you within 24 hours.

Direct contact

Currently available for new projects

Typically responds within 24 hours.

I'm open to remote work globally and on-site projects within East Africa.