Ernest Yoyowah
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Projects & Systems

What I've Built

Production systems and active development — payment infrastructure, telecom platforms, and fleet intelligence.

FintechProduction

MTN Pay

Central Payment Gateway

MTN Pay is the central payment gateway for MTN, integrated by multiple services including the Self Service Portal. It handles Mobile Money transactions, PCI DSS–compliant Mastercard hosted checkout, and airtime top-up.

  • PCI DSS–compliant Mastercard hosted checkout
  • Mobile Money disbursements and collections
  • Airtime top-up integration
  • OTP verification and fraud prevention
  • Resilient flows with retry logic and status polling
ReactTypeScriptNode.jsGolang
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TelecomProduction

MTN Self Service Portal

Customer Self-Service Platform

The MTN Self Service Portal (SSP) allows customers to manage and service their MTN accounts independently. It supports broadband, data bundles, SIM management, eSIM provisioning, and more, integrated with MTN Pay for in-portal payments.

  • Broadband and data bundle management
  • SIM and eSIM provisioning
  • Self-service account management
  • Integrated with MTN Pay for payments
ReactTypeScriptNode.js
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TelecomProduction

MTN Pulse

Youth Platform · MyMTN App

MTN Pulse is MTN's youth platform, delivered within the MyMTN app. The platform provides targeted offers, data bundles, and digital experiences for MTN's young subscriber base.

  • Youth-focused features within the MyMTN app
  • Targeted offers and data bundle flows
  • Frontend contribution 2023–2025
ReactTypeScriptNode.js
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Identity & SecurityProduction

MTN Auth Services

Centralized Identity & Access

MTN Auth Services provides centralized identity and access control using Auth0, consumed by multiple MTN applications across Ghana and South Africa MTN Group, supporting secure and consistent authentication at scale.

  • Auth0-based centralized authentication
  • Consumed by multiple MTN services in Ghana and South Africa
  • Biometric verification integration with Metrics Africa
  • Supports centralized access control at scale
Auth0Node.jsTypeScript
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SystemsProduction

Autosurveil GPS

Fleet Intelligence Platform

A full-stack fleet intelligence platform providing live GPS tracking, route analytics, and vehicle management. Led the full redevelopment of the platform across frontend and backend.

  • Led full-stack redevelopment of the platform
  • OTP-based authentication and onboarding flows
  • Route history and analytics dashboard
  • Multi-fleet management interface
Next.jsTypeScriptNode.jsMongoDB
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