Stephen Olusegun

Results-driven Frontend Developer with 3+ years of expertise building high-performance, scalable React applications. Specialized in React optimization, component architecture, and frontend performance tuning. Proven track record of resolving complex debugging issues, implementing reusable component systems, and delivering pixel-perfect responsive UIs.

Strong foundation in full-stack development with proficiency in REST APIs, state management, and backend integration. Passionate about clean code, performance optimization, and creating seamless user experiences.

Frontend Developer at KDN Group LLC (2025-04 – Present)

• Developed production-grade React applications with optimized component architecture, implementing best practices for performance, maintainability, and scalability
• Built reusable React component library with custom hooks and composition patterns, improving team productivity by 35% and reducing code duplication
• Optimized React performance by 45% utilizing memo, useMemo, and useCallback hooks to eliminate unnecessary re-renders and improve rendering speed
• Debugged and resolved complex frontend issues including state management bugs, React lifecycle issues, memory leaks, and component rendering problems
• Implemented responsive UI layouts with Tailwind CSS and CSS3, ensuring pixel-perfect designs across all devices and browsers
• Improved bundle size by 30% through code splitting, lazy loading, and dynamic imports, reducing initial page load time
• Integrated REST APIs and managed complex state with Redux and Context API, ensuring smooth data flow and component communication
• Conducted comprehensive testing using Jest and React Testing Library, maintaining code quality and preventing regression bugs

Software Engineer at Devhire

• Developed comprehensive job marketplace platform with Next.js frontend featuring employer and jobseeker dashboards with role-based access
• Built scalable Node.js/Express.js backend architecting RESTful APIs for job postings, user management, and complex dashboard functionalities
• Integrated Socket.io enabling real-time WebSocket communication for live job notifications and instant application updates
• Implemented RabbitMQ message queuing system improving API response times by 25% and optimizing asynchronous processing at scale
• Designed PostgreSQL database schemas efficiently storing job postings, user profiles, and application data with optimized queries
• Established CI/CD pipelines automating testing and deployment, ensuring reliable feature delivery and reducing deployment time by 30%

Full Stack Developer at Idera Herbal Multicure (2024-10 – 2025-01)

• Developed responsive React frontend with reusable component architecture delivering intuitive user experiences
• Engineered Express.js backend services designing RESTful APIs supporting efficient client-server interactions and business logic
• Integrated Paystack payment gateway enabling secure transaction processing with comprehensive error handling and validation
• Implemented RabbitMQ for asynchronous message queuing improving API response times by 25% and system scalability
• Established Git workflows and CI/CD pipelines automating testing and deployment for reliable feature delivery

Mobile Developer at Benew Inc

• Built cross-platform mobile applications using React Native delivering high-performance native experiences on iOS and Android
• Integrated native modules and APIs including biometrics, camera functionality, and push notifications enhancing app capabilities
• Implemented state management using Redux and Zustand ensuring predictable and scalable application architecture
• Leveraged WebSocket and RESTful APIs for real-time communication and efficient data synchronization
• Set up CI/CD pipelines automating mobile builds, testing, and deployments streamlining the release process

B.Sc. in Mathematics – Lagos State University (2020 – 2024)