Collins Osolo

I’m a Backend Software Engineer with over 3 years of hands-on experience designing, building, and maintaining scalable backend systems across fintech, edtech, and social platforms. I specialize in Java and Kotlin with Spring Boot, and have a strong foundation in database design, API development, system optimization, and cloud infrastructure.

At BCDClub LLC, I led the development of mission-critical backend features including real-time chat with WebSockets, a robust notification engine, and user-blocking mechanisms. My work directly contributed to a 25% increase in user engagement and a 30% boost in monetization. I also championed test-driven development, improving code coverage to over 90% and reducing production incidents by 80%.

Prior to that, I worked at ExRx.Net, where I developed core backend services for a flagship fitness mobile app and mentored junior developers. At Zeraki and KCB Bank, I contributed to feature rollouts, internal tooling, and performance optimizations that enhanced user experience and data access speeds.

My toolkit includes Spring Boot, PostgreSQL, MySQL, MongoDB, Firebase, Redis, Docker, GitLab CI/CD, and cloud platforms like GCP and AWS. I’m also experienced with REST API design, role-based access control, and secure data workflows. Though I focus on backend systems, I have contributed to front-end projects using Vue.js and Angular when needed.

Beyond code, I enjoy collaborating cross-functionally, mentoring others, and continuously learning. I value clean, maintainable code and believe good engineering is about solving real problems at scale.

I’m currently open to full-time or contract opportunities where I can contribute my backend expertise, collaborate with talented teams, and help build impactful, user-centered platforms.