Axiom

May, 2023 - Current

Sr. Backend Engineer

Experienced backend developer specializing in high-performance API development using Golang and Node.js. Proven track record in designing and implementing scalable systems with focus on complex data processing and analytics.

Key Responsibilities:

• Team Leadership: Led a development team of 4 engineers, resulting in 30% faster project delivery through streamlined task delegation, daily code reviews and implementing a 24-hour support rotation system that reduced bottlenecks by 40%.
• Cross-Department Coordination: Established bi-weekly cross-functional meetings with Product, QA, and Operations teams, reducing miscommunication by 65% and decreasing project alignment issues from 8 to 2 per sprint. Created standardized documentation that improved interdepartmental handoffs by 50%.
• Online Issue Resolution: Restructured and enhanced the logging system architecture, implementing structured logging that significantly improved troubleshooting efficiency, reducing average diagnostic time for common issues from 45 minutes to under 10 minutes. Established log tracing mechanisms for critical business processes, increasing cross-service issue localization accuracy by 75%.

Notable Projects:

• Member Data Management System: Developed an internal system to manage member data and process complex reports, enhancing data accessibility and usability.
• Onlyfans-like Feature: Built a feature supporting post publishing, site messaging, and subscription or following functionalities for creators.
• Risk Management System: Developed an internal monitoring system to track and analyze potential risks in real-time.

Performance Optimization:

• Data Query Optimization: Migrated data to Clickhouse to efficiently handle 3 million transactions per month, reducing query times by 80% while maintaining system performance under heavy load.
• SQL Tuning: Monitor and analyzed slow queries, refine the query or adjust table structure to reduce query times by 95%.
• Integrate Elastic APM : Integrate APM to monitor log , metrics of applications 

Additional Contributions:

• Conducted comprehensive integration testing to ensure system stability and reliability.
• Collaborated closely with cross-functional teams to define and implement new features.
• Managed project timelines, ensuring timely delivery of milestones and overall project success.
• Regularly reviewed code and provided constructive feedback to maintain high code quality standards.

Nogle

Aug, 2022 - May, 2023

Software Developer

Mainly responsible for providing APIs  for crypto exchange, like NFT and trading bot. And also integrate third-party platforms for collecting user operations.

Notable Projects:

• Developed a feature for supporting users who can buy and sell NFT on our platform.

Additional Contributions:

• POC swagger and define a rule for our team to follow.

• Integrated third-party platform(MixPanel) for tracking user operations. 

GOGOX

Jul, 2021 - Aug, 2022

Backend Engineer

Mainly responsible for internal systems, mainly the payment function, providing a ui for operation teams to manage orders and also providing APIs for driver app and client app usage. Support online issue solving, and improve system efficiency.

Important feature 

• Developed feature of bulk top-up/deduct tool for internal users through Ruby and Sidekiq(Job scheduler).

• Using Sequent(CQRS and Event Sourcing framework) to define a new event to fix wrong data. 

• Send mail(Amazon SES) to notify the user when the user's credit is going to expire.

Trevi

Nov, 2017 - Jul, 2021

Backend Engineer

Mainly responsible for accounting system, game server development and maintenance. Support online issue solving, and improve system efficiency.

Important feature 

• Developed batch system that decreased existing system loading.

• Developed an encrypted library via v8 addons. It supports user verification by tapping the card. Enter password is no longer needed, so that workflow efficiency is highly enhanced.

• Developed feature of one-touch dial and voice authentication by Node.js. It integrates existing phone system and enhances the user experience.

• Developed a real-time store payment system, hotel-booking and Car-hailing system to enhance the user experience.

• Developed internal system for roulette game, process game flow control and signal analysis from game server.

Performance tuning

• Enhanced efficiency of hierarchical report form, and processing speed has increased 95%.

• Design form-uuid to solve axios irregular issue that sends duplicate requests when users post.

 Refactoring code / flow

• Developed a library of IP Whitelisting. It supports IPv4/IPv6 and segment setting and increases flexibility configuration for devOps use.

• Developed a library of limit rates by ip to defense DDos attacks.

• Refactor code and redesign table schema to increase readability, maintainability and efficiency.

• Design trace-id to help developers debug vast amounts of logs. Debug time has decreased 40%.

 POC

• Do benchmark to assess the efficiency, pros and cons of Oracle DB upgrading.

• Export metrics of the current system to Prometheus that shows results on a dashboard for analysis.

Quadas

(split from Vpon)

Nov,2016 - Nov, 2017

DevOps Engineer

Mainly responsible of service auto deployment and maintenance, monitoring

• Setup Production Consul and Nomad environment

• Handle production service deployment

• Ksyun cloud migration

• Handle staging environment and support new feature testing

Vpon

Mar,2016 - Nov,2016

DevOps Engineer

Mainly responsible of service auto deployment and maintenance, monitoring

• Import ICE to reduce AWS cost ( Include ice customized changes )

• Setup auto deployment and AWS ASG , Spot mechanism

• Setup service environment for integration testing

• Handle staging environment and support new feature testing

• POC consul , nomad