Self-Employed Freelance Software Engineer | Full Stack | Front & Back Experienced (20 years) | Seeking remote work job opportunity
I am a software engineer based in Seoul, South Korea, holding M.S. degrees in both Computer Science and Business Administration. With extensive experience in various programming languages and frameworks for software application development, I am confident that I will be a valuable asset to any organization.
I thrive on challenges and enjoy working on projects that push me beyond my comfort zone and knowledge base. Continually learning new languages and development techniques is important to me, as it contributes to both my personal growth and the success of my organization.
My interests lie in data mining and machine learning.
Please don’t hesitate to contact me if you have any questions or comments. You can reach me at contact (at) mrlatte (dot) net. I read everything sent to those addresses. Thank you.
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Smile Taxi Driver




I have carried out maintenance work on a taxi calling application designed for both taxi drivers and passengers. The application has been updated to meet the latest Android update requirements and made compatible with Android apps and backend (.net). Thorough testing has been conducted to ensure there are no issues...
smiletaxidriver, May, 2022 - July, 2022
android dotnet windows
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Dr. Kyowa Kirin




I was responsible for developing the Kyowa Kirin portal site, which is a medical information platform for healthcare professionals in Korea. The site is designed to provide accurate and up-to-date information to medical personnel for the benefit of their patients. I worked on the entire development process independently, utilizing AWS...
kyowakirin, Nov, 2021 - Dec, 2021
web php aws
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Genuone Sciences


Genuone Sciences homepage renewsl works. This work focused on changing the legacy bad structure, creating an new admin mode and upgrade system without errors.
genuonesciences, June, 2021 - June, 2021
php web
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Alcon Online Courses


This is an online education platform for partners of Alcon Korea. It has been implemented as a web based on the AWS platform and has been integrated with webex1 and zoom2. This service includes functions such as watching real-time educational...
Alcon, March, 2021 - April, 2021
web php aws
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Plingo






Plingo is an English learning application that contains videos created by English producers. I developed this project react-native and supported iOS and Android store distribution, backend and admin console.
Threelabs, March, 2020 - February, 2021
react-native android ios mobile software
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Karma




I developed a mobile messenger. This app supports end to end encryption, timer messages to enhance security, and encrypts files and videos for transmission. And the app also supports video and audio calls.
Karmalab Inc., June, 2020 - December, 2020
mobile messenger android encryption security video voice
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Jaranada






Online customized training services for babies. Implemented Android and iOS in-app payment and subscription payment. Implementation and optimization of native functions integrated to web apps
Jaranada Inc., November, 2020 - December, 2020
web pdf hotel
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AfterTheRain

Android and iOS app optimization, Mobile webpage optimization
AfterTheRain, December, 2020 - December, 2020
mobile messenger android ios
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Oilnow







Based on Big Data Analysis and Algorithm Application, the app automatically recommends the closest and cheapest gas station near my location. This app helps you save on fuel costs by analyzing oiling patterns.
Puzzles Ventures, December, 2017 - October, 2020
kotlin android mobile gas-station
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Oilnow owner



This app can be used as a push notification to see price changes at nearby gas stations. The app is available for weekly price trend in the list.
Puzzles Ventures, February, 2020 - October, 2020
gas-station gas kotlin mobile android software
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Selecs Partner



Kakao Sync1 integration and bridge implementation, Commerce API implementation, CMS Customization, Order information synchronization https://business.kakao.com/info/kakaosync ↩
Maeil Dairies Co.Ltd, July, 2020 - Auguest, 2020
web kakaosync php api
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Park Hyatt Seoul




Park Hyatt Seoul, Jun, 2020 - Jun, 2020
web pdf hotel apm
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Oakwood Premier


This is the site of the Oakwood Premier Hotel. I did the maintenance, fix bugs and improve features of this site. And I added function to check personal information processing policy and telecommunication business operator laws in this site.
Oakwood Premier, Jun, 2020 - Jun, 2020
web pdf hotel
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Rootimpact




Technical SEO1 audits, Backlink audits, Local SEO, Link building, Indexation analysis and repair, Google penalty recovery, Keyword research https://ko.wikipedia.org/wiki/검색_엔진_최적화 ↩
Root Impact, May, 2020 - May, 2020
web seo search google analysis
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Chago






This app is a quote comparison service when purchasing a new car. I applied Adbrix1 and Facebook SDK2 to this project and worked on optimizing the app. http://adbrix.io/ ↩ ...
Chago, March, 2020 - April, 2020
objective-c java android ios mobile software
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Supyrocks




It is about online shopping malls. I customized the skin making work based on the godo mall. This project worked on a design like Google’s main screen.
supyrocks, March, 2020 - May, 2020
godo commerce html css
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Elradio








It is online shopping malls. I customized the skin making work based on the godo mall.
Partina Group Seoul, February, 2020 - February, 2020
godo html css mobile desktop
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Dimeclub


Maintenance works for dating app. It’s an app currently used by over a million people. This app includes real-time chat and recommendation features.
dimeclub, February, 2020 - April, 2020
java android ios objective-c mobile dating
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Sweetco




Rental car price comparison web application and mobile app. Stabilization and upgrade works. Bulk push feature upgrades and many service bug fixes.
Sweetco, December, 2019 - January, 2020
java android ios objective-c php mobile web
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coachs.pro








coachs.pro is a football coaching brokerage platform. Anyone can get coaching from a famous coach through uploaded video. Anyone with coaching skills can sell their products, and players can get coaching from famous coaches online.
LAUM GmbH, April, 2019 - December, 2019
brokerage platform node.js express backend frontend mobile desktop web scss
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Wegen Scan



Wegen is a cryptograph wallet based on a block chain system. It includes the activation function using 3D security label made with ultra-thin nano process.
Wegen, April, 2019 - July, 2019
blockchain wallet kotlin android mobile
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Moongkl Works


This is markup and publishing for the building homepage.
Moongkl Works, June, 2019 - June, 2019
writing letter web html javascript publishing
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Fivesense
Apps that could host the application on a web-based with native code from Android(Java) and iOS(Swift and Objective-C), and registered it in the Google Play and Appstore.
Fivesense, March, 2019 - June, 2019
android ios java objective-c swift mobile
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Jaro


Smart tape measure application for Android. Work for CJ proposal. Troubleshoot upgrading from BLE 4.0 to BLE 4.2
Julda, March, 2019 - March, 2019
ble bluetooth java android mobile
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CLET






CLET is a powerful cryptocurrency wallet and an easy ICO platform. Blind investment for token sales and ICO is coming to an end. Now you can raise profit with judgements and investments based on practical information. It is important for ICO projects to attract new investors. Entry barriers for the...
Daily Token, May, 2018 - March, 2019
blockchain wallet kotlin ndk android mobile
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MYFit







When buying clothes online, it’s hard to choose the right size and difficult to understand how a garment will fit. MYFit is an online clothing fitting service. This service analyzes your body type and recommends the optimal size of clothes.
MYFit, January, 2019 - May, 2019
web react node.js fitting predict mobile desktop
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ESM (Sales Management System)


This project is a web based sales platform development for bidding and placing orders. I have designed a special bidding and ordering algorithm for this project. I was all involved in the design and development of the entire platform.
ESTsoft, January, 2017 - December, 2018
sales management web software java spring mysql
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CoinupTV




CoinopTV is a web service that supports educational content related to block chains. This service supports live streaming integrated with YouTube services. Users can subscribe to this service.
Delicon, April, 2018 - October, 2018
blockchain lecture video html5 javascript node.js web mobile
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UUNIO



UUNIO is a blockchain-based Social Media Contents Market Place platform with an actual reward system. Users are remunerated for the entirety of the value that they create inside UUNIO. UUNIO is created for the decentralisation of information and equitable redistribution of value created by user contents.
Daily Token, March, 2018 - April, 2018
blockchain token node.js ejs scss javascript web
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Sendlike





Developing a dating app that open patterns that users have given scores.
GoldFactory, March, 2018 - May, 2018
kotlin android mobile
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FastOrder




FastOrder is an online order service using a smartphone. It also supports application for tablets that can be used in stores. This service can manage customers more efficiently without significantly changing existing store ordering system. I participated in ideation of service, service planning, design concepts, and prototyping. I have experienced...
Fastlink Corp., March, 2018 - July, 2018
order kotlin android mobile
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Myriels



The network map for your mobile contacts. The network map would be a visual guideline on designing your contact map. I implemented wi-tag feature on the network map. A Wi-tag is an anonymous tag that helps you better understand people on your contact map.
Bodhic, December, 2017 - February, 2018
java android mobile
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Megapatrol Management System


RF Card management system development. (Windows Application). MegaPatrol is management device which can supervise human’s activities especially for security guards to check whether they fulfill the patrolling work according to certain plan and rules. It’s easy and effective to control and track security guards’ activities.
BioRF, December, 2017 - December, 2017
visual-basic desktop windows
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RisingStar



It is a personal broadcasting service that supports live streaming. It is implemented as Android native using Kotlin. I have experienced with live streaming back-end building and protocol integration through this service.
Delicon, November, 2017 - December, 2018
java kotlin android node.js wowza firebase cloud storage firestore node.js mobile
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Aston KYC & Management pages


This is a website that supports cryptocurrency investments related to ICO (Initial Coin Offering). KYC (Know Your Customer), user wallet address authentication etc included.
CERTON, December, 2017 - February, 2018
express node.js html5 javascript pug less jquery css3 kyc web
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Fresh Gourmet


Fresh Gourmet is a company that cooks and sells lunch boxes. This is a web page that sells lunchboxes online as they expand their offline business online.
Fresh Gourmet, October, 2017 - October, 2017
html5 javascript jquery css web
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T-messenger


It is a mobile messenger for business use by the Oman government. The project uses WebRTC technology. I did the optimization work on this project for various network environments.
WADI International, September, 2017 - September, 2017
java android mobile
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Ready U




An Android application that connects with people going to ski resorts. This app includes matching people, chatting, bulletin boards, and skiing skills.
Ready U, September, 2017 - November, 2017
kotlin android project management mobile
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CashFeed



CashFeed is a mobile flyer service that analyzes user patterns based on your location and recommends nearby stores. This app allows users to redeem points when they see the ad. The user can accumulate points and exchange them for goods.
Delicon, September, 2017 - March, 2018
java kotlin android mobile
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MeBuy



An Android application that curates PPL videos for real purchasing. Implemented hybrid application technology, video and content management technology.
Delicon, July, 2017 - September, 2017
java kotlin android web jade scss html5 javascript mobile
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Chuze



This service is predicts and recommends clothes that fit well with your physical information before purchasing clothes. The service basically recommends the optimal size of clothes for small and medium-sized brands based on large-sized clothes that fit well.
Julda, July, 2017 - September, 2017
vue.js html html5 css javascript mobile
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Salalee



An Android application to meet new people, invite friends and chat. In particular, this app can only be signed by employees of a certified company.
GoldFactory, June, 2017 - September, 2017
kotlin android mobile
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Sleek Project



This is a mobile app and a web project. The web application allows the user to select, schedule and pay for fitness programs. The mobile app application is an O2O service. The app can connect with users and trainers.
Buddies, March, 2017 - September, 2017
kotlin android html scss less mobile web
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OTT(Over The Top) Service; Mug



This app is an Android application that watches movies and TV. This app can be viewed or streamed online. The app implemented location aware technology using Wifi and multi-format streaming video playback technology.
Delicon, February, 2017 - July, 2017
java kotlin android ott mobile
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Sales Management System
A Web application based Java that manage sales, and order within the company. The service included an algorithm for calculating the sales priority.
ESTsoft, February, 2017 - May, 2019
java html html5 css javascript web desktop back-end front-end
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Smart Tape Management; Jenda



An Android application that manages measurement by communicating with Smart Tape via Bluetooth. The app can connect with smart tapes to view, organize and share size data. Dimension management, Body shape management and smart tape measure data calibration algorithm added in Phase 2.
Julda, January, 2017 - June, 2017
java android mobile
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Modify the Groupware in intranet for the mobile environment

Porting legacy groupware to mobile environment. The groupware for KCC group with over 4,800 employees.
KCC, October, 2016 - December, 2016
java spring mybatis tiles oracle javascript linux groupware jquery mobile web desktop back-end front-end
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Comgree




A messaging application for teams. The service is available online or on a standalone. Implemented in Java a Messaging Application which performs real-time messaging and chat for team. Along with three other team members who wrote the server, iOS and web application.
Eazler, March, 2016 - December, 2016
java android socket.io mobile
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T-messenger





It is a mobile messenger for business use by the Oman government. The project uses WebRTC technology. I did the optimization work on this project for various network environments.
Eazler, Auguest, 2015 - March, 2016
java android socket.io mobile
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Tellustech

This web service supports calibration equipment certification and certification application services. This web service supports multiple languages such as Korean and Vietnamese.
Tellustech, March, 2015 - May, 2015
java spring mybatis thymeleaf postgresql javascript grunt less coffeescript linux web desktop mobile back-end front-end
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Doctor Implant




Implemented in Node.js Back-end Service and Back Office which supports API and consults management. Implemented in Java an Application which performs chat and consultation with dentists. Lead engineer on this product.
ESTsoft, January, 2015 - March, 2015
node.js grunt jade stylus socket.io android java express project manager mobile desktop back-end front-end
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SkinDoc




Implemented in Node.js Back-end Service and Back-office which supports API and consults management. Implemented in Java an Application which performs chat and consultation with dermatologists. Lead engineer on this product.
ESTsoft, September, 2014 - December, 2014
node.js grunt jade stylus socket.io android java express project manager mobile web desktop back-end front-end
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Works for KISA; ISMS Certification
Establish and deploy policies for development. Development process rehabilitation including configuration management and development history. Perform security tasks. Establish a standard process for the development team.
ESTsoft, February, 2014 - April, 2014
paper-work
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Common forum system for mobile applications
Implemented in PHP, AngularJS, C# and JavaScript an Application which performs Bulletin board system for Mobile application. The project was included as a hybrid mobile app. I shipped this product to over 5,000,000 customers in Republic of Korea.
ESTsoft, February, 2014 - April, 2014
php codeigniter angularjs mysql asp.net c# javascript bootstrap3 jquery linux windows lead mobile
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Synchronized song lyrics system redesign

Implemented in Java an Application which performs Real-time lyrics from mp3 files. I released this product to over 10,000,000 customers in Republic of Korea. Participated in this project as a Technical Architect.
ESTsoft, February, 2014 - April, 2014
java spring mysql apache solr linux project manager desktop windows back-end
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Fast zip code search engine
Implemented in PHP an Application which performs find zip code by address. Changed system and wrote code to improve performance of this engine, by over 100% better than the legacy system.
ESTsoft, January, 2014 - January, 2014
php mongodb c# linux lead programmer web back-end front-end
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Redmine Sticky Messages plugin
Implemented in Ruby a plugin for whole over 100 employees.
ESTsoft, December, 2013 - December, 2013
ruby html javascript jquery linux lead programmer back-end
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Automated statistics tools
Implemented in Selenium an Application with collects statistical data from the web automatically. Made this Application to reduce over 8 working hours a month to collecting statistics.
ESTsoft, November, 2013 - November, 2013
python selenium windows desktop lead back-end front-end
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Mobile advertise and statistics system
Implemented in PHP, C#, JavaScript and Hadoop an Application which analytics to measure applications and advertisement data to gain business insights. Lead engineer on this product.
ESTsoft, October, 2013 - December, 2013
php asp.net c# javascript html hadoop pig bootstrap3 jquery linux windows mobile lead programmer back-end front-end
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ALSee for Windows 8.1 App



Implemented in JavaScript and HTML5 a Application which animations, transitions, node nesting, layering, filtering and caching for images.
ESTsoft, September, 2013 - October, 2013
javascript html5 team leader desktop front-end
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Cloud storage service; ALCloud




Implemented in Java an Application which unifies storage from multiple Cloud Services or Social Networking Services. Lead engineer on this product.
ESTsoft, January, 2013 - October, 2013
java spring mybatis mysql jquery javascript node.js linux lead programmer web back-end front-end
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Infra service for ALTools
Implemented in C#, PHP and Python a Application. Developed and managed updates for products that banners, advertisements system for applications with over 10 million users. Lead engineer on this product.
ESTsoft, January, 2010 - June, 2013
asp.net c# php python mysql sql oracle flash flex javascript jquery windows linux team leader back-end front-end
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BizHard



Cloud storage and business environment service. Implemented in C#, C++, Java, Python and many other languages an Application which performs a cloud storage service, mail hosting, messenger, forum and mobile for iOS and Android. Lead engineer on this product.
ESTsoft, January, 2008 - January, 2010
asp.net c# oracle flash flex python prototype jquery javascript team leader web back-end front-end
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Human resource management system
Implemented in C# an Application which performs HRM (Human resource management) and electronic approval system used by over 300 employees for the company.
ESTsoft, August, 2007 - January, 2008
asp.net c# mysql javascript jquery html5 flash windows web back-end front-end
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Security mail service for national institute
Development security mail solutions for government used by national agencies.
3Rsoft, July, 2006 - August, 2006
java oracle javascript linux software engineer data modeling back-end front-end
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Web application for game; Cabal Online
Implemented in C# an Application which performs Member, Payment, Community and Forum services for Game. Lead engineer on this product.
ESTsoft, June, 2005 - February, 2006
asp.net c# sql javascript windows team leader web back-end front-end
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Content provider site for DRM Service; ALX
Implemented in C# an Application which performs DRM(Digital rights management), Payment and Member services development. Lead engineer on this product.
ESTsoft, April, 2005 - June, 2005
asp.net c# sql server javascript windows team leader web desktop back-end front-end
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Online storage solution; InternetDisk
Web application development and data modeling for online storage solution.
ESTsoft, January, 2005 - April, 2005
php mysql javascript linux desktop back-end front-end
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Online storage service; IDisk
Web application development and data modeling for online storage solution. This service was provided by major portal of the Republic of Korea.
ESTsoft, February, 2003 - January, 2005
asp.net c# oracle javascript windows desktop back-end front-end
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Inventory management system; Octopus
Inventory management system for warehouse.Barcode scan and manage application using Windows CE.
Comcast, January, 2002 - February, 2003
embedded visual c++ 4.0 windows ce 4.0 stl desktop front-end
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대한결핵협회 금연사이트
대한결핵협회 금연사이트 개발
Comcast, January, 2001 - February, 2002
asp back-end front-end
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Gwacheon Internet Broadcasting Station website
과천시청 인터넷 방송국 홈페이지 개발, 실시간 방송 송출, 미디어 서버 구성
Comcast, January, 2001 - February, 2002
asp windows server back-end front-end media-server
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Gimpo Internet Broadcasting Station website
김포시청 인터넷 방송국 홈페이지 개발, 실시간 방송 송출, 미디어 서버 구성
Comcast, January, 2001 - February, 2002
asp windows server back-end front-end media-server
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Hongik University Alumni Association website

홍익대학교 총동문회 홈페이지 개발
Comcast, January, 2001 - February, 2002
asp windows server back-end front-end
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Web services for internet broadcasting
Web application development for internet broadcasting system. Deployed in many public institutions in the Republic of Korea.
Comcast, August, 2002 - January, 2003
asp php javascript windows desktop back-end front-end
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Personal live internet broadcasting system; MyPandora


Development for private broadcasting solution. Implemented in MFC an Application which performs live video or audio streaming.
Comcast, February, 2002 - August, 2002
visual c++ visual basic asp windows linux desktop back-end front-end
With commercial projects experience. (Alphabetical order)