Joshua Okello

JOSHUA OKELLO Senior Full Stack Developer Nairobi, Kenya - |-Portfolio LinkedIn Profile URL PROFESSIONAL SUMMARY Self-starting Full Stack Developer with 5+ years of experience building fast, reliable web applications in agile environments. Proven expertise in React, Node.js, and relational databases with a pragmatic, customer-first approach. Strong team player with experience collaborating across functions to deliver high-quality solutions on time. Committed to writing clean, maintainable code following SOLID principles and best practices. TECHNICAL SKILLS • • • • • • • • Frontend: React, JavaScript, TypeScript, HTML5, CSS3, Tailwind, Next.js Backend: Node.js, Spring Boot, RESTful APIs, Microservices Databases: PostgreSQL, MySQL, MongoDB Programming Paradigms: Object-Oriented Programming, Functional Programming, SOLID Principles Design Patterns: Factory, Singleton, Observer, MVC, Repository API Technologies: RESTful, GraphQL DevOps & Tools: Git, Docker, CI/CD Pipelines, Agile/Scrum Testing: Jest, Unit Testing, Integration Testing PROFESSIONAL EXPERIENCE Software Engineer (Full Stack) Fin Africa | April 2024 - Present • • • • • • Developed real-time payment processing system using Node.js and React, achieving 99.9% uptime and 30% faster transactions Implemented TypeScript across both frontend and backend to improve code quality and reduce bugs by 40% Designed and built microservices architecture following SOLID principles, improving system scalability and reducing downtime by 30% Enhanced database performance by 50% through PostgreSQL query optimization and indexing Led cross-functional collaboration between product, design, and QA teams to deliver customer-focused solutions Mentored junior developers and championed code quality through pair programming and code reviews Software Engineer Tridens Technology | May 2022 - April 2024 • • • • • • Built responsive web applications using React and TypeScript, improving user experience and system reliability Developed backend services with Node.js, creating efficient APIs that reduced response times by 45% Applied object-oriented design patterns to create maintainable, modular code architecture Collaborated with cross-functional Agile teams to deliver projects on time, reducing development cycles by 40% Created reusable component libraries that accelerated development across multiple projects Implemented GraphQL APIs, improving data fetching efficiency and frontend performance Quality Assurance Engineer Copia Global | February 2021 - April 2022 • • • • Designed and executed comprehensive test plans for Node.js and React applications Implemented automated testing using Jest, increasing defect detection rates by 25% Collaborated with developers to ensure code quality and adherence to SOLID principles Streamlined testing processes, reducing manual testing time by 25% and improving release cycles Full-Stack Developer Stemscence | June 2020 - January 2021 • • • • • Built scalable web applications using React, Node.js, and MongoDB, reducing load times by 40% Implemented TypeScript across the stack, reducing type-related bugs by 35% Designed PostgreSQL database schemas optimized for application performance Integrated third-party services and APIs, enhancing application functionality Applied design patterns and SOLID principles to create maintainable, extensible codebase Backend Engineer WorkFleek Ltd | February 2020 - May 2020 • • • Developed backend services for Prism Health application using Node.js and PostgreSQL Collaborated with frontend team to design and implement RESTful APIs Implemented database optimizations that improved query performance by 35% Software Engineering Intern Sendy Ltd | April 2019 - September 2019 • • • Assisted in developing full-stack logistics solutions using JavaScript frameworks Gained hands-on experience with Agile methodologies and cross-functional collaboration Contributed to database design and implementation using MySQL EDUCATION Bachelor of Science in Software Engineering Kisii University | 2016 - 2020 Second-Class Honors CERTIFICATIONS • Bachelor of Science in Software Engineering LANGUAGES • • English (Fluent) Kiswahili (Fluent)