M

Mateusz Han

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United States

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Résumé

Jobs verified_user 0% verified
  • C
    Senior Software Engineer
    Cargo Express Freight
    Nov 2023 - Current (2 years 7 months)
    Architected blockchain integration system using Python and Flask, enabling seamless token and bridge protocol connectivity across multiple blockchains, supporting 50+ cryptocurrency networks with 99.98% uptime. Designed and implemented service-oriented solutions for logistics platform, integrating external freight APIs and payment systems with PostgreSQL backend, reducing data synchronization latency by 45% and processing 100K+ daily transactions. Led code review processes and established unit testing standards achieving 87% code coverage across 15+ microservices, mentoring 4 junior engineers and improving deployment velocity by 30%. Engineered Python backend services with Flask and Redis for real-time cargo tracking, handling 2M+ concurren
  • PuzzleHR
    Senior Full Stack Engineer
    PuzzleHR
    Sep 2021 - Oct 2023 (2 years 2 months)
    Architected Python backend services using Flask and PostgreSQL for HR SaaS platform serving 200+ enterprise customers, processing 5M+ employee records with 99.95% uptime and unit testing coverage of 85%. Designed and implemented service-oriented microservices architecture for employee authentication and role-based access control, integrating OAuth2 and SAML protocols, reducing authentication latency by 40% and supporting 500K+ concurrent users. Engineered REST APIs and GraphQL endpoints using Flask and Python, enabling integration with 25+ external HR systems and third-party services, processing 2M+ API requests monthly with sub-50ms response times. Optimized SQL/NoSQL database queries and implemented Redis caching layer across MongoDB and
  • BIOTRONIK
    Full Stack Engineer
    BIOTRONIK
    Sep 2019 - Aug 2021 (2 years)
    Built Python backend services using Flask for medical device data platform, processing 10M+ daily sensor readings from connected cardiac devices with 99.98% reliability and HIPAA-compliant data architecture. Designed service-oriented solutions for real-time patient monitoring system, integrating HL7 and FHIR standards with PostgreSQL and MongoDB, supporting 50K+ active patients across European healthcare networks. Implemented unit testing framework using Pytest with 80% code coverage, reducing critical production incidents by 42% and improving code maintainability across 8 microservices handling sensitive medical data. Optimized SQL database performance through query optimization and indexing strategies, reducing average query time from 800
  • 10Clouds
    Software Engineer
    10Clouds
    Jun 2017 - Jul 2019 (2 years 2 months)
    Developed Python backend services and REST APIs using Flask and Django for e-commerce and SaaS clients, processing 2M+ monthly transactions and supporting 100K+ active users across 15+ production applications. Designed and implemented service-oriented architecture for multi-tenant SaaS platform, integrating payment processing and third-party APIs, handling 500K+ daily API requests with 99.9% uptime. Optimized SQL database queries and implemented caching strategies using Redis, improving application performance by 45% and reducing server costs by 30% across 5 client projects. Implemented unit testing and test automation using Pytest, achieving 75% code coverage and reducing production defects by 35% while improving development velocity by 25
Education verified_user 0% verified
  • Hanoi University of Science and Technology
    Bachelor's Degree in Computer Science
    Hanoi University of Science and Technology
    Jan 2012 - Jan 2016 (4 years 1 month)