About

My name is Ka-Ho “Kelvin” Lee.

I have been working on enterprise-grade, scalable backend solutions for more than 13 years.

Summary

I have more than 13 years of hands-on experience in backend development, growing together with the team at Zensis , a software solution provider in Hong Kong, by learning and introducing new languages and tools over the years.

Specialization

• Architecture
  • High availability
  • Site resilience
  • Redundancy
  • Cloud and on-premise
• RESTful API servers
• HTTP proxies

Domain knowledge

• Retail Banking
  • Consumer Credits
    • Overdrafts
    • Loans
  • Payments
    • Single Euro Payments Area (SEPA)
• Telecommunications
  • RADIUS authentication and accounting
  • SMS, SMSC and SMPP
  • Multimedia messaging service (MMS)
• Real estate brokerage
  • Estate Agents Authority regulations in Hong Kong
• Enterprise system integration
  • Directory server integration for authentication
  • System monitoring tool integration

Technology stacks

• JavaScript / Node.js
  • Express
  • Sails
• Perl
• PHP
• Python
• Kotlin
  • Spring Boot
• TypeScript

Documentation and specifications

• OpenAPI 3.0

Cloud

• Amazon Web Services (AWS)
• Microsoft Azure

Databases

• CockroachDB
• MariaDB / MySQL
  • Galera Cluster
• MongoDB
  • Replica sets
  • OpsManager
• Redis

Event streaming

• Apache Kafka

Networking

• Wireshark

Operating systems

• Linux
  • Fedora
  • CentOS

Languages