Android Software Engineer (full-stack)

Development Project (Android): Nexon Play, FIFA Official Helper, Study Geto, Maple Hands+, Play Geto

Development Project (Web): Nexon Cafe M

Participated as a team member for developing and maintaining 6 native Android apps which have been downloaded more than 9 million times for assisting gameplay at the gaming company.

Working as a mobile software development team member in gaming company, I am focusing on creating the various features that game users need on the gaming platform service. I experienced using various types of Android libraries for various functions.

Before joining the current team, as a full-stack developer, I have contributed to building web-based in-house service to show and rate the menus of the company cafe using AWS-style in-house cloud service like EC2, S3. Used node.js and Vue.js.

Nexon is the leading gaming company in Korea and owns Dungeon & Fighter Online, which ranks #1 in the global digital game market in the PC sector. (refer to here)

Nexon serves a number of top-selling games in the Korean and Asian PC and mobile game markets, including Dungeon & Fighter Online, Kartrider, Maple Story, V4, The Kingdom of the Wind, and FIFA Online. The Kingdom of Wind is the longest-serving online game in the world and is listed in Guinness World Records.

Related Article : Ex-executive of Walt Disney Kevin Mayer named as Nexon’s outside director, Nexon Offers Acquisition Proposal To Disney

Ineractive Media Artist

Artworks : here

Published various entertaining interactive media installation works with a focus on internet-based technology and amusing user interaction.

Organized a team to participate in the exhibition, and was noticed in the major Korean TV news media, KBS news.

Has led teams consisting of multiple roles as a director or a technical director conducting human and project management for projects.

Both individual activities and activities in the media artist group PENSER were carried out.

Software Engineer Intern

Development Project : PetBuffet - Pet Food Nutrition Analysis & Recommandation Service

As a software developer internship program, during the three months of the project period, I worked on completing one project from planning to testing.

NAVER is the leading search engine company of South Korea and is frequently termed “the Google of Korea”. Naver Cloud is a company affiliated with Naver that provides public cloud services like Amazon Web Service or Google Cloud Platform.

Co-founder

Development Project : Neighborhood Internet Cafes

It was founded to create new value for the Korean internet cafe industry. As a co-founder member solely responsible for product development and technology, has designed a full-stack system which provides information about internet cafes based on location.

Through our service, users were able to grasp detailed information such as available seats in internet cafes, games provided, PC specifications, and whether convenience facilities were provided.

Achieved the highest number of users reaching more than 19,000 among Android apps which provide information about internet cafes and was awarded with multiple financial supports by start-up assistance projects hosted by the Seoul city government and Korea University.

Nexon Play

Nexon Play is a comprehensive platform application that enhances the gaming experience of Nexon games. Its main features include game news feeds, random reward boxes, messenger functions that can communicate with in-game, and authentication features for game login.

Nexon Play was launched in DEC 2012 and the number of total mobile app downloads is 7,000,000+.

• Stabilized the service of MAU 750k+ and DAU 330k+ within 0.3% crash rate continuously via Firebase Crashlytics with the experience of raising the stabilization rate from 94% to 99% due to a problem with the Android system including the experience of collaborating with smartphone manufacturers to solve problems.
• Corresponded to various types of failures issued by the service with over 5 million downloads
• Aiming for a clean architecture, applied continuous refactoring to remove redundant codes (about 30% for a specific function) and improve code efficiency
• Established and updated various striking and interactive functions to meet the gaming and storytelling experience, including a Pokemon Go style location based AR game features using Google ARCore which attracted more than 140,000 people to participate in the event and became a hot topic in the gamer community during the event period
• Took charge of renewal of the main page which led positive feedbacks from users by improving user experience
• Developed the messenger function by taking charge of the chatting and friend management screen, especially adding friends, friend request, friend blocking, etc using Sendbird SDK with more than 400,000 DAUs recorded
• Implemented special store services for VIPs which attracted the attention of game users which contributed to sales up 35% compared to the same period last year

FIFA Official Helper

FIFA Official Helper is a Companion app for FIFA Online, an online version of the FIFA series, the world's best-sold soccer game series from Electronic Arts.

The app has been downloaded more than 500,000 times.

• Stabilized the service within 0.3% crash rate continuously via Firebase Crashlytics
• Developed large updates including major UI renewal and push notification changes which drawed most registered weekly, monthly ratings (average 200%) within the past 2 years, improved by 0.9 points out of 5 points (⭐ 3.2 ⇒ ⭐ 4.1) in Google Play Store, and the most pageviews within a year (115% increase over the previous year)
• Customized the android webview to communicate with the web page while applying workarounds for the Android OS's own bugs

Study Geto

Study Geto App is the part of the total solution system for 'Study Cafe' industry (a kind of co-working space for studying payable on an hour or term basis) in Korea, which allows users to reserve and use space.

• Participated in about 50% in the new product development phase
• Stabilized the service within 0.3% crash rate continuously via Firebase Crashlytics
• Linked PG(Payment Gateway) module for credit card payment
• Implemented a function to deduct and update the ticket remaing time in real time using Countdown Timer

Nexon Cafe M

Nexon Cafe M is web-based in-house service to show and rate the menus of the company cafe for employees.

• Was in charge of developing both sides of back-end and front-end and has been developed by using AWS-style in-house cloud service like EC2, S3
• Node.js is used for back-end and vue.js is used for front-end
• Collaborated with three developers to develop new services
• Git strategy was established to effectively utilize git's functions by creating branches for each function and using pull requests to review code
• Confluence tool has been used for task distribution strategy establishing and management

PetBuffet - Pet Food Nutrition Analysis & Recommandation Service

PetBuffet is a project developed during the Naver Cloud internship period to provide nutrition information for pet food released on the market and recommend food suitable for the condition of pets.

• Took responsibility for the entire process of development
• Used jQuery for Frontend, node.js for Backend, MySQL for DBMS
• Focused on maintaining high availability by introducing HA Proxy and database replication
• Focused on data visualization through jquery's graph library
• Designed a full-stack system of CRUD for nutrition information

Themeparkers

This service is an app that provides information about amusement parks and attractions in Korea.

By applying the UX design methodology, I have implemented a beautiful and convenient UX for massive users.

This app shows information about multiple Korean amusement parks and attractions at once. Themeparkers is the only general theme park information application in Google Play Store in Korea. In that sense, Themeparkers is now a valuable app for fans in the amusement park industry.

Currently, the service is only provided in Korean and English service is being developed.

Node.js is used for backend, MongoDB is used for DBMS, Mongoose is used for ORM Tool.

• Today's themeparks and attractions opening hours and calender
• Graphical display of current and past attraction status and waiting time, show starting time
• Latest theme park news YouTube videos and webzines
• Data driven estimated waiting time for today
• My Favorite Attraction and sharing
• Review articles and YouTube videos by attraction

• Applying modern Android architectures and libraries by actively utilizing AAC ViewModel (MVVM), Livedata, Databinding, and Android Navigation Component
• Focusing on creating a rich user experience similar to the experience of theme parks by creating custom views for smooth interaction behaviors of content fragment and natural animations
• Applied various libraries for elegant visual effects and interactions such as Glide, BlurView, ParallexImageView, etc
• Various interactions and animation effects are applied to reduce IO latency experienced in Internet communication
• Actively using of coroutines and reactive programming to cope with asynchronous processing
• Used Room library to persist data where needed
• Implemented show start time notification function using foreground service
• Actively used of ORM tools (Mongoose) to focus on business logic with object-oriented code
• Applied html parser Cheerio to retrive information from official websites

Gmail Service Improvement

It was conducted as a Term Project of UX Academy.

The new prototype of Gmail App was derived from the methodology of task analysis, user survey, usability test, survey, affinity diagram, depth interview, persona analysis, and paint point analysis to solve various UX problems that Gmail Mobile Application had at that time.

Document : Final PT, PT 1, PT 2 (user research)