Collins Osolo
Backend Engineer-| -
Work Experience
Software Engineer – BCDClub LLC
Aug 2023 – Apr 2025
- Spearheaded the development of 10+ high-impact features, increasing project completion
from 30% to full deployment.
- Engineered a scalable notifications system that boosted user retention and engagement by
25%.
- Designed and implemented real-time chat using WebSockets, supporting 1,000+ concurrent
users with sub-100ms latency.
- Developed user tagging in posts, leading to a 40% increase in social interaction metrics.
- Integrated dynamic age verification workflows for regulatory compliance across jurisdictions
(100% coverage).
- Led initiative to implement end-to-end testing, reaching 90% test coverage and reducing
production incidents by over 80%.
- Built a user-blocking feature, enhancing community safety and reducing user complaints by
60%.
- Rolled out tip functionality, increasing in-app monetization by 30%.
Software Engineer – ExRx.Net
May 2022 – Aug 2023
- Led backend development of the Workout Tools API, successfully launching the flagship mobile
app.
- Boosted unit and integration test coverage from 50% to 90%, accelerating sprint velocity and
decreasing hotfixes by 70%.
- Mentored junior developers and reviewed 100+ pull requests, contributing to better code
quality and team knowledge sharing.
Backend Engineer – Zeraki
Jan 2022 – May 2022
- Refactored report generation module, reducing average processing time by 35%.
- Partnered with product and business teams to launch 3 new features, directly contributing to
customer acquisition.
- Enhanced database indexing and query optimization, leading to improved dashboard load
times by 50%.
Full-Stack Engineer Intern – KCB Bank
Feb 2021 – May 2021
- Contributed to development of User Access Control portal to manage roles across 10+
departments.
- Collaborated with UI/UX teams to enhance internal systems' usability, resulting in 2x faster
task completion by staff.
- Participated in Agile sprints and presented demo features in stakeholder meetings.
Core Skills
Languages & Frameworks: Java, Kotlin, Spring Boot, JavaScript, Vue, Angular, SQL, MySQL,
PostgreSQL
Tools: Docker, Github, GitLab CI/CD, Postman, Firebase, Redis, GCP, AWS
Education
Bachelor of Science in Software Engineering
Multimedia University of Kenya — Sep 2017 – Dec 2021
