Melvice Junior Guimfack

Designed and deployed production Android application (Java, AWS AppSync, Cognito) processing 1,000+ real-time events/day for 500+ truck drivers Integrated Datadog monitoring reducing incident detection time by 30% Reduced cloud infrastructure costs by 20% ($3K/year saved) by optimizing AWS Cognito authentication caching and implementing exponential backoff retry logic

Front-End & Mobile Developer - ESmart - Montréal, QC

(2025-05)

• Designed and deployed production Android application (Java, AWS AppSync, Cognito) processing 1,000+ real-time events/day for 500+ truck drivers
• Integrated Datadog monitoring reducing incident detection time by 30%
• Reduced cloud infrastructure costs by 20% ($3K/year saved) by optimizing AWS Cognito authentication caching and implementing exponential backoff retry logic
• Enhanced UI/UX for 15+ React components used by 20+ employees and conducted 30+ code reviews improving team code quality scores by 25%

Full-Stack Developer (Intern) - Stingray Digital - Montréal, QC

(2024-01 - 2024-04)

• Delivered 12 production features for SaaS platform serving 1000+ users using Ruby on Rails, React/Redux, Python, and PostgreSQL
• Optimized 5 REST API endpoints improving average response time by 25% (from 400ms to 300ms)

Software Developer & Team Lead - PolyStar Polytechnique Montréal - Montréal, QC

(2022-09 - 2024-09)

• Led team of 5 engineers developing real-time embedded C++ systems for competitive robotics (RoboMaster — Seattle 2023, Colorado 2024)
• Led sprint planning and code reviews, improving team delivery consistency and reducing defects in production releases

B.Eng. - Software Engineering - Polytechnique Montréal (2025)