New York · Building at Probook
AI systems · Education · Engineering leadership

Christian Yongwhan Lim

Building AI systems, technical organizations, and the next generation of engineers.

  • Chief Architect · Probook
  • Adjunct, Computer Science · Columbia University
  • Director of Internships · ICPC Foundation
  • Formerly Google Research & Two Sigma
Christian Yongwhan Lim at Probook
Currently building AI-native systems at Probook

Public counts checked July 26, 2026 · scheduled teaching included through Fall 2026

640+
Research citations

Computer vision, networks, and programming languages — CVPR, IJCV, OOPSLA.

Google Scholar
429+
Community members

Columbia competitive programming, built from the ground up.

Team record
107
Completed ICPC internships

ICPC Foundation program, with 19+ active interns as of July 2026.

Program record
17
Universities hosting talks

Invited talks across North America, Europe, and Asia.

Talk record
14×
Course offerings at Columbia

Competitive programming and interview preparation, including scheduled offerings through Fall 2026.

Course record
ICPC World Finals teams coached

Columbia teams at the 2022 and 2024 World Finals.

Team record

Mission

A simple belief

Exceptional people, equipped with the right tools, communities, and opportunities, can accomplish extraordinary things.

I build systems that help people solve hard problems at scale.

Whether through AI, education, infrastructure, or competitive programming, I enjoy building systems and organizations where talent can grow, collaborate, and compound over time.

My work connects AI-native products with more than a decade of teaching, mentorship, and technical community-building — from engineering platforms at Google Research and Two Sigma to developing talent through Columbia and the ICPC Foundation.

If you’re building ambitious products, advancing AI, strengthening technical communities, or investing in the next generation of builders and researchers, I’d be happy to connect.

Current Focus

2026

How the Work Connects

Systems · People · Scale

Research, education, and community are built to reinforce one another — each a different expression of the same work: creating reliable systems, widening access to opportunity, and helping technical talent grow.

Core principle Build systems that help people solve hard problems. Evidence into practice. Practice into opportunity.
Systems

Intelligent Systems

Agentic workflows, real-time speech, infrastructure, and reliable execution.

  1. Research
  2. Architect
  3. Ship
Capability at scale
People

Education

Curriculum, deliberate practice, teaching, and technical talent development.

  1. Teach
  2. Practice
  3. Grow
Talent in motion
Network

Community

Competitions, camps, mentorship networks, and institutions that compound.

  1. Convene
  2. Mentor
  3. Scale
Opportunity that compounds

Selected Impact

Also: Books · Problem-solving record

Selected Current Leadership

Five highlights
Industry

Probook

Chief Architect · AI-native systems for home service businesses

Education

Columbia University

Adjunct, Computer Science · ICPC coach

Talent development

ICPC Foundation

Director of Internships · global technical talent programs

Global programs

ICPC & IOI

Symposium chair, journal senior editor, chief judge, curriculum co-chair, and Team Pakistan trainer

Alumni leadership

Stanford University

Reunion campaign co-chair · Asian Pacific American Alumni Club board

Full record, including education and awards: Résumé · ICPC leadership · Community engagement