Open to opportunities

Roger Koranteng

@rogerkoranteng

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Senior software engineer focused on building secure, high-performance backend platforms.

Ghana

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What I'm looking for

I’m looking for a team where I can build secure, scalable backend systems—improving performance, reliability, and developer experience. I want ownership over API design, data models, and production architecture, with real impact on users.

I’m a Senior Software Engineer in Accra, Ghana, and I build backend-first systems that turn business workflows into reliable, scalable products. At Walter Gates Ghana Limited, I engineered a payment processing platform and Laravel API backend with Sanctum authentication, queue-based notifications, and automated fee/commission calculations.

Recently, I led architecture work on a multi-tenant SaaS backend (Laravel + Redis queues + Horizon), optimizing latency by 40% and improving real-time billing responsiveness to ~200ms. I also design RESTful/GraphQL APIs, data models in PostgreSQL/MySQL, and production deployments with Nginx, Certbot SSL, Supervisor, and Linux (Ubuntu)—and I bring that same performance and security mindset across IoT and educational platform builds.

Experience

Work history, roles, and key accomplishments

Lead Software Engineer

US College League

Designed and optimized a scalable multi-tenant SaaS backend (Laravel + Redis queues + Horizon) handling thousands of concurrent users, reducing request latency by 40%. Built secure student billing APIs with token-based authentication and caching (200ms average response time) and improved PostgreSQL performance by reducing query execution time from 3s to under 300ms.

Laravel Redis Horizon GraphQL Caching PostgreSQL Performance Optimization

Senior Software Engineer

Waltergates Ghana Limited

Engineered payment and installment platforms across the Walter Gates ecosystem, including ITC UniWallet integration, Laravel API development with Sanctum authentication, and automated fee/commission calculations. Built a digitized informal sector database with a Next.js frontend and Laravel backend, and improved operational reliability using queue-based processing with Supervisor and secured stagi

Laravel PHP API Development Queue Processing (Supervisor)Next.js Nginx Certbot SSL PostgreSQL Payment Processing

Backend Engineer

Kofa Technologies

Developed web-based IoT data management and analytics solutions for electric motorbikes using PHP/Laravel, improving real-time tracking and contributing to a 15% reduction in local emissions. Optimized data processing workflows by 30% and built RESTful APIs backed by efficient MySQL structures to integrate system components and third-party services.

PHP Laravel RESTful APIs MySQL Performance Optimization API Integration Analytics Monitoring

Software Engineer

VB IT Consult

Built and maintained a multi-tenant Laravel application for multiple educational institutions with isolated data and configurable setups. Implemented bulk Excel student imports, reliable queued SMS/email notifications, and automated demo provisioning, while managing Ubuntu deployments with Nginx, Supervisor, and Vite production build optimization.

Laravel Data Imports Queued Notifications Laravel Horizon Supervisor Nginx Vite Automation

Software Engineer Intern

Blue Sky Products Gh. Ltd.

Contributed to developing and improving software features by identifying issues, optimizing functionality, and ensuring code quality across assigned modules to support overall system reliability and user experience.

Optimization Code Quality Assurance Modules