- Led the end-to-end design and development of a scalable multi-store e-commerce platform supporting over 1 million users, resulting in a 30% increase in transaction volume and a 20% improvement in page load times through architectural optimization and seamless integration with 100+ European stores.- Integrated mobile money payment gateways alongside credit card services, driving a 40% increase in successful transaction rates and a 20% reduction in payment processing time, ensuring a frictionless and secure payment experience across diverse user segments.- Enhanced system scalability and performance, achieving a 35% boost in overall system efficiency and a 50% reduction in downtime, effectively accommodating a 45% surge in user traffic during peak periods without compromising stability or user experience.

- Led the migration of the fantasy sports platform from a Ruby on Rails to a Single Page Application (SPA) with Progressive Web App (PWA) features, resulting in a 40% improvement in page load times and a 25% increase in user engagement.- Implemented smooth user authentication, ensuring secure access to the platform for over 50,000 users and reducing unauthorized access attempts by 30%.- Integrated football API data seamlessly, providing real-time updates on player statistics, match scores, and team performance, enhancing user experience and increasing user retention by 20%.- Developed a comprehensive score tracking system for live shows, enabling users to follow and predict outcomes in real-time, resulting in a 35% increase in user engagement during live events.- Streamlined user wallet loading from payment gateways, enabling seamless deposits and withdrawals, with a 95% success rate and a 25% increase in transaction volume.

- Successfully developed and deployed backend systems using Ruby on Rails and PostgreSQL, enabling seamless integration with mobile money APIs.- Conducted thorough testing using RSpec, achieving a 30% decrease in bug occurrence and ensuring high-quality code delivery.- Implemented user authentication and verification processes, resulting in a 25% increase in user trust and engagement, ensuring secure access to financial services with a user base of over 10,000 customers.- Established analytics infrastructure, enabling data-driven decision-making and enhancing customer experience, resulting in a 15% increase in user retention.- Implemented cashback rewards program, resulting in a 20% increase in customer loyalty and repeat transactions.- Designed and optimized background job processing, reducing system latency by 25% and improving overall system performance.- Collaborated with cross-functional teams to identify and implement product enhancements, resulting in a 30% increase in platform usability and customer satisfaction.

- Led the integration of a real-time tracking system, reducing service provider Estimated Time of Arrival errors by 80% and leading to a 15% decrease in customer complaints related to service delays.- Implemented a user-friendly review and rating system, which contributed to a significant improvement in the marketplace's overall service quality, with average ratings increasing from 3.8 to 4.5 out of 5, resulting in a 20% increase in repeat business.- Collaborated with the marketing team to optimize the referral program, resulting in a 50% increase in new user sign-ups and a 30% rise in referral-driven revenue.- Identified and resolved critical security vulnerabilities, reducing security incidents by 90% and earning the marketplace a reputation for being a safe and reliable platform for both users and service providers..

Installed and maintained corporate site interconnections.Maintained corporate firewall and VPN service.Configured, installed and maintained IP networks, radio communications, CCTV surveillance systems, WIFI access points for local customers.