Hosang Jeon


Personal Profile


"Can I say something?
Um, I'm the type of person that if you ask me a question and I don't know the answer, I'm gonna tell you that I don't know.
But I bet you what, I know how to find the answer and I will find the answer."

- "Fictional character: Chris Gardner". "The Pursuit of Happyness", 2006.

This sentence is a famous line by Will Smith in the movie "The pursuit of happniess" and it is the sentence that best describes me as a programmer.

I'm a software engineer who has finally solve a given problem. Furthermore, I'm the one who knows the way to utilize the appropriate technologies and writing good code in terms of designing, convention and architecture, rather than just solving the problem so that the function works.


스타트업 인 액션
기술 스택 선정, SEO, 로그 분석, 검색 및 추천, 보안, 개발 문화까지
전호상 저 | 이상과공상 | 2017년 4월 12일

스타트업을 시작하는 프로그래머를 위한 거의 모든 것

IT 기술 기반의 스타트업을 구현하려면 다양한 분야의 지식과 경험이 필요한다. 그러나 스타트업의 특성상 초기에 이러한 지식과 경험을 가진 전문가를 영입하기란 매우 어렵다. 그렇다고 해서 한 명이 모든 분야의 전문성을 갖추기란 어렵다.

이 책은 스타트업을 구현하는 데 필요한 각 분야의 기술을 알아보고 실제 구현하는 방법을 알아봄으로써, 스타트업에서 경험하지 않으면 알기 어려운 것들과 적은 인력으로 초기에 겪어야 할 기술적 수행착오를 줄이고자 한다. 또한, 알맞은 기술 요소 선택과 하나의 서비스가 어떻게 이루어지는지 관심이 있으신 분들께 추천한다.

  • 제1장 Getting Started
  • 제2장 프론트엔드 레이어
  • 제3장 웹 애플리케이션 개발
  • 제4장 로그 데이터 분석
  • 제5장 Full Text 검색과 추천 시스템
  • 제6장 인프라스트럭처
  • 제7장 아마존 웹 서비스 (AWS)
  • 제8장 보안
  • 제9장 개발 문화
  • 제10장 서비스 규모의 도약을 위한 준비
  • 제11장 결국, 제일 중요한 건 사람
  • 목차 더보기...


Tech Lead & Architect, Ruby on Rails, Elasticsearch

Fullstack Development

Ruby on Rails





Graduating with double majors at Ajou University.

Ajou University, Korea

Bachelor of Information & Computer Engineering - Graduated: 2008

I attended classes in O/S, object-oriented programming (Java), computer communications, database management systems, algorithms, data structure, software engineering, and system programming.

Bachelor of Biological Science - Graduated: 2008

I attended classes in molecular biology, biochemistry, genetics. I studied not only biological theory, but also the way to research while doing lab internship.

University College Cork, Ireland

Visiting Student. Sept, 2006 - Dec, 2006

I studied in Ireland UCC (University College Cork) as a visiting student. I attended five major classes and I got an A+ in each one. It is guaranteed that I truly have no problem with communicating in English for work.


Software Engineer

LOGISPOT https://www.logi-spot.com

Chief Technical Officer / Seoul, Korea / May, 2018 - Current

Tech lead & Architect
  • Building Logistics platform with PHP/Laravel.
    • Building an Open API for integrating third-party systems.
    • Handling Billions of Time series GPS data with Logstash/InfluxDB.
    • Building an Log Management intrastructure using SQS, Logstash, S3 and ProstoDB.
  • Doing DevOps to guarantee Service Reliability and cost-effective quality of service.
Tech Team Management
  • Building and Managing a Tech team (Recruiting, Setting up Process and Development Culture)
  • Direct the development and implementation of Logistics platform.
  • AManaging on-off line Sercurity Vulnerabilities.

JOBPLANET https://www.jobplanet.com

Software Engineer / Seoul, Korea / Nov, 2014 - May, 2018

Fullstack developmnt
  • Building a robust web application with Ruby on Rails (two millions of MAU in average).
  • Global expansion to Indoenesia (i18n, l10n)
Data analysis backend
  • Collecting logs and process KPIs such as MAU, DAU, Session durations, Marketing campaign efficiencies. (PrestoDB, Elasticsearch, Logstash)
Personalized full-text search
Recommender system backend
  • Company recommender system using Collaborative Filtering (Apache Spark)
  • News collecting and displaying related news


Software Engineer / Seoul, Korea / Dec, 2012 - Nov, 2014

KT GenomeCloud platform (human genome annotation and context based decision support system)
  • RESTful API server development (Node.js)
  • Distributed DB/searching system development (Elasticsearch)
  • Automated genome analysis platform development & maintenance (Java/Spring framework)


Software Engineer / Seoul, Korea / Jan, 2008 - Nov, 2012

Bioinformatics Algorithm Research & Development
  • NGS(Next-Generation Sequencing) alignment software development using C programming language.
  • Building web application with Java, Spring framework, JSP.
  • Adapted the Hadoop framework to handle big input and intermediate data, and developed some MapReduce programs to increase the performance of data analysis.