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Sin-Woo Bang

Python Backend Developer

Personal Info


Seoul, Korea




Date of birth





2014-01 2014-09

Co-Founder, Backend Developer

Klavis Inc.

  • Developed a service
    • HEART: a mobile application that sends the message "I love you" anonymously
  • Technical Stack
    • Web server: Nginx, Python/Flask, SQLAlchemy, Gunicorn, Celery Database: PostgreSQL
    • OS: Ubuntu

2015-06 2018-12

Team Manager and Lead Developer For Development Team


  • Developed services
    • Add2paper: a free printing service used by over 800 thousand university students
    • Add2paper Black: a software that manages influencer marketing
    • Additpay: a FinTech service that provides small loans to university students
  • Projects
    • Cloud migration with Zero Downtime: from Korea-Telecom Cloud to AWS Cloud
    • Elimination of SPOF: MySQL Failover using HAProxy
    • Partnership project with Canon Korea Business Solution
  • R&R
    • Programmed a backend application
    • Distributed a backend application to EC2 instances
    • Architected cloud infrastructures
    • Distributed a mobile application to Google Play & App Store Reviewed code changes to a mobile service for Frontend, Backend
    • Chaired changes to a mobile service such as changing the design
    • Chaired HR for the Development Team
  • Technical Stack
    • The average number of concurrent users: 300 - 3,000
    • Infrastructure based on AWS: EC2, S3, CloudFront, ElastiCache
    • Web server: Nginx, Gunicorn, Python/Django, AWS Lambda
    • Socket server for providing a printing signal: Django Channels
    • Socket server for a legacy printer device: Gevent
    • Database: MySQL(Master and Slave Replication)
    • Cache: Redis, Memcached
    • Deployment: Fabric
    • Version Control: Github
    • Test: Django Nose, Codeship CI


2011-03 2014-02

Sunrin Internet high school

  • The first IT specialized high school in South Korea
  • Studied Information and Communication

2014-03 present

Kyung Hee University

  • Bachelor in Computer Engineering 

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