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I am Joshua Okello, a passionate software engineer specializing in backend development with strong expertise in Spring Boot, Quarkus, and microservices. I thrive on building scalable fintech systems and optimizing database performance to ensure robust and efficient transaction processing. With a background that includes mentoring developers and fostering team growth, I enjoy collaborating within Agile teams to deliver timely and secure backend solutions. Throughout my career, I have gained valuable experience across frontend and backend technologies, automated testing, and cloud infrastructure. I am committed to employing best practices, continuous learning, and delivering high-quality software to solve complex challenges in the fintech and technology sectors. Fluent in English and Kiswahili, I value clear communication and cross-functional teamwork.…I am Joshua Okello, a passionate software engineer specializing in backend development with strong expertise in Spring Boot, Quarkus, and microservices. I thrive on building scalable fintech systems and optimizing database performance to ensure robust and efficient transaction processing. With a background that includes mentoring developers and fostering team growth, I enjoy collaborating within Agile teams to deliver timely and secure backend solutions. Throughout my career, I have gained valuable experience across frontend and backend technologies, automated testing, and cloud infrastructure. I am committed to employing best practices, continuous learning, and delivering high-quality software to solve complex challenges in the fintech and technology sectors. Fluent in English and Kiswahili, I value clear communication and cross-functional teamwork.

Joshua Okello

Front-End Developer, Back-End Developer, Full Stack Developer, +2

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I am Joshua Okello, a passionate software engineer specializing in backend development with strong expertise in Spring Boot, Quarkus, and microservices. I thrive on building scalable fintech systems and optimizing database performance to ensure robust and efficient transaction processing. With a background that includes mentoring developers and fostering team growth, I enjoy collaborating within Agile teams to deliver timely and secure backend solutions. Throughout my career, I have gained valuable experience across frontend and backend technologies, automated testing, and cloud infrastructure. I am committed to employing best practices, continuous learning, and delivering high-quality software to solve complex challenges in the fintech and technology sectors. Fluent in English and Kiswahili, I value clear communication and cross-functional teamwork.…I am Joshua Okello, a passionate software engineer specializing in backend development with strong expertise in Spring Boot, Quarkus, and microservices. I thrive on building scalable fintech systems and optimizing database performance to ensure robust and efficient transaction processing. With a background that includes mentoring developers and fostering team growth, I enjoy collaborating within Agile teams to deliver timely and secure backend solutions. Throughout my career, I have gained valuable experience across frontend and backend technologies, automated testing, and cloud infrastructure. I am committed to employing best practices, continuous learning, and delivering high-quality software to solve complex challenges in the fintech and technology sectors. Fluent in English and Kiswahili, I value clear communication and cross-functional teamwork.

Available to hire

I am Joshua Okello, a passionate software engineer specializing in backend development with strong expertise in Spring Boot, Quarkus, and microservices. I thrive on building scalable fintech systems and optimizing database performance to ensure robust and efficient transaction processing. With a background that includes mentoring developers and fostering team growth, I enjoy collaborating within Agile teams to deliver timely and secure backend solutions.

Throughout my career, I have gained valuable experience across frontend and backend technologies, automated testing, and cloud infrastructure. I am committed to employing best practices, continuous learning, and delivering high-quality software to solve complex challenges in the fintech and technology sectors. Fluent in English and Kiswahili, I value clear communication and cross-functional teamwork.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Swahili

Fluent

Work Experience

Software Engineer (Backend Focus) at Fin Africa

April 1, 2024 - Present

Architected and implemented highly scalable fintech payment systems using Spring Boot and Quarkus, achieving 99.9% uptime and ensuring robust transaction processing. Designed and built resilient microservices architecture, resulting in a 30% reduction in system downtime and significant improvements in scalability. Enhanced database performance by 50% through strategic query optimization and effective indexing strategies. Developed comprehensive API documentation and standardized backend development practices, improving team efficiency and code consistency. Mentored junior developers on advanced backend technologies and best practices, fostering team growth and knowledge transfer.

Software Engineer (Frontend Focus) at Tridens Technology

April 1, 2024 - August 13, 2025

Contributed to backend development using Spring Boot, adhering to robust RESTful API design principles. Optimized database queries and implemented caching strategies, successfully reducing API response times by 5%. Designed and implemented secure authentication and authorization systems, enhancing application security. Collaborated effectively with Agile teams, delivering backend services on time and reducing development cycles by 10%. Performed thorough code reviews and provided technical guidance, ensuring high code quality and adherence to best practices.

Quality Assurance Engineer at Copia Global

April 1, 2022 - August 13, 2025

Developed and implemented automated testing frameworks, increasing defect detection rates by 25%. Conducted comprehensive performance testing of systems, effectively identifying and resolving critical bottlenecks. Created robust API testing suites, ensuring data integrity and enhancing system reliability. Collaborated closely with developers to align testing efforts with development milestones, streamlining the release process.

Full-Stack Developer at Stemscence

January 31, 2021 - August 13, 2025

Implemented efficient backend services using Spring Boot and MongoDB, significantly optimizing data handling efficiency. Designed and developed robust RESTful APIs, enabling seamless frontend-backend integration. Created optimized database schemas and data access layers to ensure optimal application performance. Integrated third-party services for secure payment processing and efficient notifications.

Backend Engineer at WorkFleek Ltd

May 31, 2020 - August 13, 2025

Developed and successfully deployed the Prism Health backend application using Java and PostgreSQL. Optimized database queries, leading to a significant 35% improvement in application response time. Implemented secure API endpoints adhering to RESTful best practices.

Software Engineering Intern at Sendy Ltd

September 30, 2019 - August 13, 2025

Collaborated on backend systems for logistics solutions using Akka and Quarkus. Improved database query performance for critical delivery tracking applications. Assisted in implementing backend features using Django.