Certified Kernel, LLC

Software Architect

I led various projects including CertiK Skynet - One stop shop for Web3 Security Rating, Due Dilegence and Learning, CertiK Corporate Website and Shentu Chain Explorer, in charge of frontend and backend architecture changes while these successful systems gradually evolutionize during their long life time.

• In early 2021, the Skynet frontend was migrated to Next.js and was the early pioneer using Vercel and its frontend cloud.
• In early 2021, a service cluster based on Hashicorp Nomad was built and became the warehouse for all Skynet backend APIs and cronjobs.
• In late 2021, Contentful CMS was introduced so that business team can help themselves managing all contents on skynet/www websites, while developers can focus on system development - a big win-win for productivity and experience for both groups.
• In early 2022, a high performance GraphQL API server with extensive in-memory cache was created to serve as the critical gateway for all CertiK's in house data.
• In 2024, after the successul launch of Skynet Quest, integration with Cloudflare was added to deal with huge amount of bot traffic. A multi-layer cache system and graceful overload handling was introduced to improve system performance and user experience, and a self-hosting Next.js API cluster was introduced to siginicantly reduce Vercel bill due to much higher consistent traffic.
• In 2024, my team successfully migrated Skynet related EC2 instances, dynamodb tables, S3 buckets etc to a new AWS sub account, which enabled better cost analysis, strict user PII data access policy. With the migration, the infra was also implemented as Pulumi and Ansible code and deployments were highly automated.

My thoughtful system design and careful team workflow design played a key role in the successful long-term operations for the above projects, especially for Skynet, which was one of the most successful product in CertiK that kept growing for 4 years and became the 2nd revenue stream with high profit margin.

FreeWheel Media, Inc (A Comcast Company)

Principal Software Engineer

Led a frontend framework project called modulajs from scratch. Inspired by Redux, Elm, the framework was tailored to fit FreeWheel's need of modularized design and high reusability. The project also included an internal UI component library which was reused to build FreeWheel's flagship product - MRM. The project was a big success and demonstrated a great example of engineering excellence, by having 97%+ unit test coverage, plenty of documentation, tutorial and examples to make it easy to use.

Built a CLI tool called integration-cli, which became developers' swiss army knife for local development and testing. User experience is great and the testing design was quite different from existing, the idea was described in my blog post Scalable Integration Testing Method. Technologies under the hood are Kubernetes, Docker and Cypress.

Built FreeWheel US Web team from scratch by interviewing new candidates, training new hires and sharing tech insights.

FreeWheel Media, Inc (A Comcast Company)

Senior Software Engineer

Designed the initial version of frontend framework for base on React and Flux.

Led a roadmap project called Partner Module Overhaul. I spent a lot of time in pair programming, code reviews and writing unit tests in order to achieve high code quality.

Contributed to UI Foundation project which merged the functionality of 2 legacy Rails applications into one unified (still Rails) application. I was one of the main developers and I worked 3 months in USA with the PM team to support the production release.

Dockerized UI products to run inside Docker containers, this was used by most UI engineers to build their own local environment.

Built an automation to create Jenkins CI pipelines for each feature branches on Git upon push.

Gaopeng (Groupon Tencent China)

Frontend Team Leader

Built the frontend team(LAMP Stack) from scratch to 7 team members.

Led the frontend team to build the new frontend layer for gaopeng.com, through which we decoupled the model layer and view layer, and improved performance to 10x of its original architecture.

Built internal web projects for marketing, business planing, and client support departments.

Shaier Network Technology

Co-founder

Built the PHP backend and JS frontend. My input was PSD design and the output was running pages in browsers compatible to IE6.

Built the frontend team (LAMP Stack), from scratch to 7 people.

Longtop Financial Technology

Software Engineer

Developed new features with J2EE for CITIC bank.

Refactored thousands of lines of legacy codes.

Handled emergency and exceptional situations after production release.

Accelerated test environment deployment by building a semi-auto GUI tool written in Java Swing.