Peter · Beomjae LeeBackend developer

Build. Learn.
Share with others.

I’m Beomjae Lee, a developer who builds services, shares experience through teaching and study groups, and learns with others in the community.

Ruby on RailsBackend & performanceTechnical leadershipTeaching & community

Ideas, made real.

Services and apps I create.

WebpagePlus

AI webpage builder

Create and edit webpages by talking to AI. A simpler way to turn an idea into a webpage.

AIYour AI assistant
MCP
WebWebpagePlus

Connect the AI assistant you already use

WebpagePlus provides an MCP server. Connect the AI assistant you already use to WebpagePlus and create websites more easily.

Built. Operated. Improved.

Services and systems I helped build, and my contributions.

SpaceCloud

NspaceRuby on Rails

Backend development, performance improvement, and technical leadership for a space rental platform.

  • Service development

    Improved search and homepage features, automated post-payment workflows, and integrated external services.

  • Chat backend

    Designed and developed the chat backend.

  • Traffic & performance

    Improved database, caching, and application performance, with load testing to support growing traffic.

  • QA deployment automation & technical leadership

    Built an automated deployment environment for QA servers and provided technical leadership through code reviews.

JejuSquare

JejuSquareRuby on Rails · CMS

Backend and CMS development for a social meetup platform, with project leadership.Database design, server setup, payment integration, and project leadership.

Dingdong Jeju

JejuNetJava · Android

Developed a CMS using Korea’s e-government framework, improved the Dingdong Jeju Android app, and developed the Dingdong Manager app.

OpenCollege

HeadflowRuby on Rails · PHP

Website maintenance and development of payment and chat features for a learning platform.Maintained the website, integrated payments, and developed chat features.

Online assessment platform

eTestASP · Mobile web

Customized the assessment platform for clients, improved cross-browser compatibility, and added support for mobile web and Android WebView.

Wireless public telephone management system

LincommJSP

Helped implement requirements and develop user interfaces for the JSP-based management application.

Seaweed arts & culture magazine

2017Ruby on Rails · CMS

Backend and CMS development, collaboration with designers, project leadership, and server operations.

CPE & vehicle trip recorder management

Saekom · 2014Ruby on Rails

Requirements definition, database design, server setup, and Rails web development.

Career

Currently at Nspace · Confirmed 2026-10-05

  1. 2023.10 – Present

    Nspace

    SpaceCloud backend development

  2. 2022.11 – 2023.07

    Weniv

    Developer training · Database and SQL instruction at a bootcamp

  3. 2019.11 – 2022.10

    Nspace

    Development team lead · SpaceCloud backend & technical leadership

  4. 2019.05 – 2019.10

    Daeun

    Solar monitoring platform improvements · Android WebView app development

  5. 2018.04 – 2019.04

    JejuSquare

    Development team lead · Platform backend, CMS, database design, and payment integration

  6. 2017.11 – 2018.03

    MaxN

    Ruby on Rails website & CMS development

  7. 2015.09 – 2017.10

    JejuNet

    Java CMS & Android · Improved collaboration tools and the internal wiki · Supported external quality testing

  8. 2014.12 – 2015.08

    Headflow

    OpenCollege development · WordPress & Ruby on Rails teaching

  9. 2011.01 – 2014.11

    eTest

    Online assessment development, mobile support, and operations

  10. 2008.04 – 2011.01

    Lincomm

    JSP & Rails management systems · Server administration

Teaching

Sharing practical development experience through classes and exercises.

Weniv · Databases & SQL

At Weniv, I taught databases in a developer bootcamp, preparing lessons and hands-on exercises on database concepts and SQL.

Courses on Inflearn

AWS Lightsail tutorial

Created and taught the full course

Content in Korean

View course

Full-stack web development course

Taught the Git, jQuery, and Bootstrap sections

Content in Korean

View course

OpenCollege · WordPress & Ruby on Rails

I taught website development with WordPress and web programming with Ruby on Rails, sharing my experience through hands-on projects.

Community

Learning and working with others.

WordPress on the Beach

I co-planned and co-organized this WordPress education and community project, sharing the experience of building websites and learning together.

pop-up coworking meetup

A pop-up coworking community, bringing people together while they work on their own projects.

Developer study groups and meetups in Jeju

I helped launch developer study groups and co-organized meetups with a JSpace community manager.

Notes along the way

What I learn while building and studying with others, in writing and on video.