About

Ahyoung Ryu

Software Development Engineer @ Seoul, South Korea

ahyoungryu93@gmail.com

Introduction

Hi, I am a frontend software development engineer(but want to be a full-stack one day 😄) from Seoul, South Korea. I love Programming, Developing, learning and Problem Solving. I always think these three as my motto

- Most efficient way of communication

- Most intuitive UX is always better than an eye catching & brand new feature

- There are always interesting things that I have to learn

Experience & Education

Zepl Software Development Engineer

Mar 2016 - Present

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Zepl, Software Development Internship

Aug 2015 - Feb 2016

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Bachelor's Degree

Sookmyung Women's University, Computer Science 2012 - 2016

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Tech Skills & Tools

JavaScript (ES6)
Node.js
HTML5
SASS
Redux
Redux-saga
Webpack
ReactJS
AngularJS1
Jest
Enzyme
Eslint
Cypress
Jekyll
Travis
Jenkins
AWS Lambda / S3/ EC2/ CloudWatch
Git

Languages

Korean (Native)
English (Professional working proficiency)

Professional Experience

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Apache Zeppelin

Apache Zeppelin project is a one of top level projects licensed by Apache Software Foundation. Zeppelin is a web-based big data analytics & visualization tool.

Project committer & PMC * See here for more details about PMC
Ranked at #8 among 287 contributors with 104 commits
Trackable Jira issues assigned to "Ahyoung Ryu"

Contributions

A. Documentation

Apache Shiro authentication for Apache Zeppelin: Link
Interpreter in Apache Zeppelin: Link
Generic JDBC Interpreter for Apache Zeppelin: Link
Ignite Interpreter for Apache Zeppelin: Link
Lens Interpreter for Apache Zeppelin: Link
Installing Interpreters: Link
Data Source Authorization in Apache Zeppelin: Link
How to contribute to Apache Zeppelin (Website): Link
Zeppelin Notebook Authorization: Link
Supported Interpreters in Apache Zeppelin: Link
Available Helium packages in Apache Zeppelin: Link

I wrote 90% of content for the above documentation pages and also reviewed most of other pages in Apache Zeppelin official documentation website. We used Jekyll to generate the static website.

B. Frontend

Zeppelin interpreter management page improvement
Zeppelin notebook permission setting UI & logic implementation
Helium package management page implementation
Search feature in Zeppelin official documentation website
Auto-generated TOC(Table of Contents) in Zeppelin official documentation website

Other than the above, I had been involved in UI & UX improvement for overall Zeppelin web application. We used NPM / Bower / Webpack / AngularJS/ Bootstrap for general tech-stacks

C. Backend

Helium(a.k.a Zeppelin pluggable visualization / interpreter package) online package registry implementation (2016.12 - 2017.02)

Used AWS Lambda(Node.js) / S3 / Cloudwatch services
1 developer involved
Role: Research / Design / Implementation
See this Jira ticket for more details

Other than this project, I involved in fixing bugs and improvements for backend interpreters

Zepl Service Platform for Data Scientists

Zepl is a SaaS service version of Apache Zeppelin. It's more for collaborative and enterprise environments.

A. Long-term Projects (Mainly performance improvement)

Notebook rendering improvement project (2019.02 - 2019.03 / 2 months)

* What was the problem?

The more paragraphs are added in the notebook, it takes more time to render a notebook page on initial rendering. It gets slower exponentially.
Immutable object ↔ plain object conversion has been occurred too frequently and unexpectedly
Inefficient way of passing React component props
Unnecessary action dispatch + API call

* How we solved them?

Minimize prop passing between parent ↔ child components by using re-reselect if the prop can be generated by state stored in Redux store
Minimize immutable ↔ plain object conversion by using react-redux-immutable
Redesign component structure by removing unnecessary components
Removed unnecessary action dispatch & API call

* Improvements

Reaction speed has been increased 100 - 300 % after any notebook or paragraph actions(adding a new paragraph / running a paragraph / ...)
Reduced bundle size by removing unused legacy code
Development speed has been improved by re-design overall component structures

* Project size: 4 developers

* Role: research / design / development

Large data rendering improvement project (2018.11 - 2019.01 / 2.5 month)

* What was the problem?

If the size of data is too large, the browser hangs until tons of SVG elements are painted
Duplicated and inefficient data pivoting / refining logic which comes from open source, Apache Zeppelin

* How we solved them?

Built new data manipulation pipe line
Functional programming based data manipulation(used lodash fp + functional-immutableJS)
Introduced web-workers and added the logic to every data pipeline levels
Used Canvas API graph library; Nivo instead of SVG to speed up graph rendering

* Improvements

Resolved the browser hang by using Canvas graph API since it just draw one element
Easier on debugging by building a solid data manipulation logic
Contributed to Nivo charting library

* Project size: 2 developers

* Role: research / design / development

Notebook component re-writing in React project (2018.06 - 2018.09 / 3.5 month)

* What was the problem?

Notebook is a core feature in Zepl service but we just ported Zeppelin notebook service at the first time, even though Zepl is written in React whereas Zeppelin is written in AngularJS
Needed to spend much time on debugging whenever there's an issue
Since we used two large framework in one service, there are inevitable communication loss between these two parts

* What was the problem?

Rewrote AngularJs version of notebook service with React

* Improvements

Reduced time on debugging & fixing customer issues
Reduced development time and opened a chance to add more useful features in Notebook service

* Project size: 2 developers

* Role: research / design / development

B. Short-term Projects

Plotly chart editor + React Plotly chart integration \w Zepl (2019.10 / 2 weeks)

* Project size: 1명

* Role: 리서치 / 설계/ 개발

Snowflake + Zepl notebook integration, frontend development (2019. 04 - 2019.06 / 1.5 month)

* Project size: 2 developers
* Role: development

Billing Service using Stripe Payment System, frontend development (2018. 03 - 2018. 05 / 1.5 month)

* Project size: 1 developer
* Role: research / design / development

New routing system migration React Router → Universal Router) (2017.10 - 2017.12 / 2 month)

* Project size: 1 developer
* Role: research / design / development

Resource management system in Zepl, front-end development (2017.08 - 2017.09 / 1.5 month)

* Project size: 2 developers

* Role: research / design / development

2. Leveraged skills

NPM for package management
Webpack for source processing and bundling
ES6 via Babel as programming language
React, RXJS, and redux-saga as core JS stack
universal-router and history to handle routing
D3 / NVD3 / Nivo (also one of contributors in this charting library)for charting visualization
SASS and Styled Components for styles
Jest for unit tests
Enzyme for testing React components
Cypress for Integration Test
Eslint for JS linting

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A tutor @FastCampus online lecture platform

2018.05 - 2018.06 11 hours in total
"Apache Zeppelin Environment" section leading
Lecture intro
Tutor interview blog post
Lecture materials

Talks

Welcome to Apache Zeppelin Community

Shared "Off-the-record tips to become a popular Apache project's committer" @ Zeppelin User Seminar

Apache Zeppelin Training

"Apache Zeppelin Training" hands-on session @ ApacheCon, Europe 2016

What's in Apache Zeppelin 0.7.0 ? "Helium"

Introduced remarkable new feature "Helium" which is newly added in Apache Zeppelin 0.7.0 @ Fly Zeppelin, Fly

Helium makes Zeppelin Fly

Gave a talk @ ApacheCon 2017 May, Miami Florida about "How we could build Helium online package registry"

9XD Regular Seminar

"How could I become a PMC member in Apache top-level project" @ 9XD (90's developer community) (FB Posting)

All about Open Source

Gave a talk at
- Kyungpook National University
- Chonbuk National University

- Andong National University

- Hallym University

about
- Why Open Source is so popular?

- Why you need to start open source before graduation

- Open source contribution; step by step guide