Calvince Otieno

Calvince Otieno

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5.0
(1 reviews)
US$8.00
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ABOUT ME
Software Developer with 6+ years of experience
Software Developer with 6+ years of experience

Software Developer with over 6 years of experience specializing in back-end engineering. Proven ability to design and build resilient, scalable micro-services using Java, Spring Framework, and cloud-native technologies. Consistently delivers high-performance software that enhances user experience and drives operational efficiency. Open to new challenges in Software Engineering roles.

Nairobi (+03:00)
Joined November 2025
EXPERTISE
7 years experience
4 years experience
5 years experience
5 years experience
4 years experience

REVIEWS FROM CLIENTS

5.0
(1 reviews)
Fidel Douglas
Fidel Douglas
January 2026
Exceptional Full-Stack Engineer – Delivered Complex Architecture Under Tight Deadline Rating: ⭐⭐⭐⭐⭐ (5/5) I hired Calvince for a high-priority project involving a custom Next.js integration with a headless CMS backend. Despite being new to the codementor platform, he demonstrated Senior-level expertise from day one. What stood out: Technical Depth: He didn't just 'install plugins.' He engineered a robust, custom solution that solved a complex server routing challenge (CI/CD pipeline) that other developers struggled with. Proactive Communication: He provided video walkthroughs, clear documentation, and solved problems before I even spotted them. Speed & Reliability: He worked through the holidays to hit an aggressive deadline and delivered a polished, bug-free product on the first try. If you need a developer who understands both the 'Code' and the 'Business Logic' behind a project, hire Calvince immediately. He is a hidden gem on this platform.
EMPLOYMENTS
Backend Developer
Cubix
2022-02-01-2025-09-01
  • Collaborated with the cross-development team to containerise the payment module using Docker and orchestrate deployments with Kub...
  • Collaborated with the cross-development team to containerise 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 significantly.
  • Wrote unit and integration tests, improving code coverage.
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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