Junfeng Yang

Professor-turned-entrepreneur, Technologist, Advisor, Co-founder and CEO @NimbleDroid, Professor @Columbia, PhD in CS @Stanford

[Junfeng Yang @junfengy]

Hey @DarioAmodei, before AI automates 70% of customer service, can someone fix my Claude Code access? @AnthropicAI couldn't resolve my ticket and zero human reps have stepped in for over a month.

[Junfeng Yang @junfengy]

It's been 3+ weeks since I filed a support ticket and I still haven't heard from a human. Can someone @AnthropicAI look into this?

[Junfeng Yang @junfengy]

Kudos to Asaf Bord for an insightful talk in the Columbia DAP Lab seminar on building and deploying AI agents at a Fortune-100 insurance company.

Great to see real, production-grade agent systems making impact at scale 👏

[Junfeng Yang @junfengy]

Great having Maël and Columbia PhD alum Ziyuan from Squarepoint Ventures in my Agent for Work seminar yesterday. Students learned how they assess later-stage companies. Huge thanks to Maël and Ziyuan for sharing their insights!

[Junfeng Yang @junfengy]

Amazing lecture and panel by four Columbia ’24 founders/builders — Rutvik, Dominic, Alfonso & Sid — in my Agent for Work seminar! Students left truly inspired with sharp insights on customer discovery, fundraising, and market positioning.

[Junfeng Yang @junfengy]

Great to have Eunice Kokor (our own Columbia CS alum) and Fuad Ali from Arize join my 𝗔𝗴𝗲𝗻𝘁 𝗳𝗼𝗿 𝗪𝗼𝗿𝗸 class yesterday to share their insights on AI and agent engineering

[Junfeng Yang @junfengy]

Great to welcome our very own Apoorv Agarwal, Ph.D. (co-founder & CEO of TextIQ, acquired by Relativity) & Jay Patel back to Columbia for an awesome guest lecture on customer discovery in my 𝗔𝗴𝗲𝗻𝘁 𝗳𝗼𝗿 𝗪𝗼𝗿𝗸 class! Appreciate the real-world lessons from the trenches!

[Junfeng Yang @junfengy]

Thrilled to share that I received the ACM SIGOPS Mark Weiser Award at SOSP 2025!

All (read: ALL) the research it recognizes was joint with amazing students, postdocs, and collaborators — I’m just the lucky representative.

Grateful to all who made it possible ♥️

[Junfeng Yang @junfengy]

Big thanks to @andiPartovi , co-founder of @veris_ai , for an insightful guest lecture in my Agent for Work class!

Great discussion on agent simulation environments — how tool mocking enables realistic simulation, evaluation, and optimization of agent behavior.

[Junfeng Yang @junfengy]

Despite newer “safe” formats, Python Pickle is still everywhere—and downloads of repos using it keep rising.

Our system, PickleBall, statically analyzes the library that created a model to derive a safe deserialization policy 🔒

[Junfeng Yang @junfengy]

Congrats to @wunused for a great @acm_ccs ’25 talk on our joint Columbia–Brown–Purdue–Technion–Google–Socket work securing Pickle-based ML models! 🏆 Distinguished Artifact Award!

[Junfeng Yang @junfengy]

Very grateful to
@shaoxuhui
for joining my 𝗔𝗴𝗲𝗻𝘁 𝗳𝗼𝗿 𝗪𝗼𝗿𝗸 class and leading such an insightful session on AI evolution, the full stack, and startup idea creation and validation. You left a lasting impression on everyone in the room!

[Junfeng Yang @junfengy]

Big thanks to JT for a passionate and engaging lecture in my 𝗔𝗴𝗲𝗻𝘁 𝗳𝗼𝗿 𝗪𝗼𝗿𝗸 class. The students really valued hearing your perspective on how tech founders should approach sales—a critical skill rarely taught but absolutely essential for building successful companies!

[Junfeng Yang @junfengy]

Incredible session w/ Cy Khormaee and Ryan Guo in my Agent for Work seminar. Amazing prod and demo on agentic email security. Super inspiring for students to hear directly from founders building at the frontier of AI on their journeys. And big congrats on the $13M seed!

[Junfeng Yang @junfengy]

thanks to Laura for the photo

[Junfeng Yang @junfengy]

Great session in my Agent for Work seminar with @lauraham150, @dan_cahana from @notablecap. Students really appreciated the market and fundraising insights you shared. Big thanks for joining us!

[Junfeng Yang @junfengy]

Thrilled to share that our paper "Towards Making Systems Forget with Machine Unlearning" has received the #TestOfTimeAward at IEEE S&P (Oakland) 2025. Congrats to @yzcao! Deeply grateful to the community for this recognition. #ieeesp2025 @IEEESSP

[Junfeng Yang @junfengy]

@gmail Is Gmail POP3 service down? I'm not able to fetch emails from Gmail over POP3

[Junfeng Yang @junfengy]

Thanks @NSF @NSFSBIR for support! Feeling proud of the @NimbleDroid team! @CUSEAS @Columbia_Tech @ColumbiaCompSci https://t.co/Y7ooHOLvhC

[NimbleDroid @NimbleDroid]

We just won $225k @NSF small business innovation award! Thanks @NSFSBIR! Look forward to helping more devs craft awesome apps #androiddev

[NimbleDroid @NimbleDroid]

Check out our new blog post on five lesser-known ways to hang your main thread https://t.co/OjVryY2bFh #AndroidDev #perfmatters