Full-stack engineer. Fintech systems. AI-integrated products.

I build production-grade web applications and fintech systems for teams and businesses across East Africa and globally. Based in Nairobi - available for full-time roles, contracts, and consulting engagements.

CDenn - Software Engineer

Current Focus

Axum Design Philosophy

About Me

I'm a full-stack software developer based in Nairobi, Kenya, with 3+ years building production-grade web applications and fintech systems. My work spans Next.js application architecture, M-Pesa payment integrations, AI-powered tooling, and offline-first mobile apps - across SaaS platforms, browser extensions, and event-tech products.

I've led frontend architecture on multi-tenant bancassurance platforms, built Chrome extensions that inject into live Gmail DOM, and engineered offline-first systems that reconcile M-Pesa STK callbacks in real time. I work across the full stack - from database schema and API design to component systems and deployment.

My Approach: Understand the problem deeply before writing a line of code. Ship fast without cutting corners on architecture. Keep systems maintainable for the team that inherits them.

Build systems that last. Ship products that work. Own the outcome.

Location

Nairobi, Kenya · Remote-friendly

Availability

Open to roles, contracts & consulting

Tech Stack

Frontend

ReactNext.jsTypeScriptJavaScriptTailwindCSSTanStack QueryFramer Motion

Backend

Node.jsRustPrismaPostgreSQLSupabaseM-Pesa Daraja APIREST APIsDeno

Mobile

FlutterDartRiverpodsqflite

Tools

GitGitHubFigmaVercelAdobe Tools

Experience

Frontend Engineer

Jan 2025 - Present

E&M Technologies

  • Led frontend architecture and development of the core product using React and Next.js, improving page load performance by 40%
  • Designed and implemented a scalable design system adopted across 3+ product teams, ensuring UI consistency and faster feature delivery
  • Collaborated with backend and product teams to translate business requirements into performant, user-centric interfaces
  • Improved maintainability of legacy code by introducing TypeScript patterns and reusable component structures
React, Next.js, TypeScript, TailwindCSS, REST APIs

Featured Solutions

Email Refiner

Email Refiner

Open Source

AI-powered Chrome extension that enhances email writing in Gmail and Zimbra with real-time tone transformation and preview.

The Challenge

Integrating seamlessly into third-party email clients while maintaining performance, security, and a smooth user experience within dynamic DOM environments.

The Solution

Used MutationObserver to detect compose windows across both clients, isolated the React UI in a shadow DOM to prevent style conflicts, and offloaded OpenAI calls to a background service worker.

The Results
-40%Editing Time
2Supported Clients
<1sResponse Time
ReactTypeScriptChrome ExtensionsOpenAI APIMutationObserver
Ndoa Plan

Ndoa Plan

Ongoing

Offline-first wedding coordination platform built for Kenyan weddings, with M-Pesa payment reconciliation, multi-event planning, budget tracking, and real-time day-of execution tools.

The Challenge

Building a reliable planning tool for low-connectivity environments while keeping financial data consistent across offline-first sync, M-Pesa callbacks, and a multi-user role system.

The Solution

Implemented a Dexie-based local-first store with a background sync queue, conflict resolution strategy using server timestamps, and a webhook handler for M-Pesa Daraja callbacks that reconciled payments against guest contribution records.

The Results
10+Wedding Events
Real-timeBudget Accuracy
Full CRUDOffline Support
Next.jsTypeScriptPrismaPostgreSQLDexie (IndexedDB)M-Pesa Daraja APISupabase StorageTanStack QueryTailwind CSS

Let's Build Something Great.

Whether you have a project in mind, want to explore a collaboration, or just want to talk tech - I'm open to it. Fill in the form and I'll get back to you.

Prefer a call?

Book a 15-min intro call

Typically responds within 24 hours