Calvince Otieno
Mentor
Rising Codementor
US$8.00
For every 15 mins
ABOUT ME
Java Developer with 5+ years of experience
Java Developer with 5+ years of experience
Full Stack Java Developer with 5+ years of experience specialising in backend engineering. Proven ability to design and build resilient, scalable microservices using Java, Spring Framework, and cloud-native technologies. Consistently delivers high-performance software that enhances user experience and drives operational efficiency. Seeking a full-time Java Software Engineering role.
Nairobi (+03:00)
Joined November 2025
EXPERTISE
5 years experience
2 years experience
5 years experience
6 years experience
5 years experience
2 years experience
4 years experience
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EMPLOYMENTS
Backend Developer
Cubix
2022-02-01-2025-09-01
- Collaborated with the cross-development team to containerize the payment module using Docker and orchestrate deployments with Kub...
- Collaborated with the cross-development team to containerize the payment module using Docker and orchestrate deployments with Kubernetes, enhancing scalability and deployment efficiency.
- Designed and implemented RESTful APIs that supported 100K+ concurrent connections, enhancing user experience.
- Implemented caching strategies using Redis, reducing data retrieval times by 35%.
- Wrote unit and integration tests, improving code coverage by 18%.
Unit Testing
Redis
Docker
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Unit Testing
Redis
Docker
Kubernetes
RESTful API
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Full Stack Developer
Synacor
2020-05-01-2022-01-01
- Enhanced application security and streamlined the user login experience by designing and implementing a new One-Time Password (OT...
- Enhanced application security and streamlined the user login experience by designing and implementing a new One-Time Password (OTP) system for end-to-end authentication.
- Collaborated with a 3-member team to oversee the OAuth2 implementation for 5 major applications, enhancing security protocols.
- Collaborated with frontend teams to ensure seamless integration of user-facing elements with APIs.
OAuth 2.0
API Integration
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OAuth 2.0
API Integration
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Database Developer, Intern
Cooperative Bank
2019-02-01-2020-03-01
- Supported core database functionality by maintaining and refining SQL scripts alongside the development team.
- Supported c...
- Supported core database functionality by maintaining and refining SQL scripts alongside the development team.
- Supported core development team in drafting technical documentation for enterprise-level clients, streamlining the onboarding process.
SQL
Technical documentation
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SQL
Technical documentation
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PROJECTS
Bonga Chat Platform
2025
Built a chat platform dubbed Bonga. Bonga is a modern chat application built with the Spring framework, offering seamless real-time messa...
Built a chat platform dubbed Bonga. Bonga is a modern chat application built with the Spring framework, offering seamless real-time messaging for text, files, images, and videos. Combining HTTP RESTful APIs and GraphQL for efficient media handling and WebSocket for fast message delivery.
Spring
WebSocket
GraphQL
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Spring
WebSocket
GraphQL
RESTful API
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Dotenv Loader
2024
Build a lightweight, no-dependency (no deps) environment variables loader for Spring applications. It can be used in both standalone Spri...
Build a lightweight, no-dependency (no deps) environment variables loader for Spring applications. It can be used in both standalone Spring applications and Spring Boot-powered applications.
Spring
Spring Boot
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Spring
Spring Boot
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