# Anhang Zhu

![Anhang Zhu](/resources/cognition/portraits/anhang-zhu.webp)

Leads Devin Oncall & Automations at Cognition; co-founder of TierZero (acq. Cognition) and Mayhem.gg (acq. Niantic); ReactJS founding team at Facebook  
Cognition  
San Francisco, California, United States

## At Cognition

- Role: Special Projects (Research)
- Joined: May 2024
- How they joined: With TierZero (https://www.autumn.ai/resources/cognition/acquisitions/tierzero)
- Before TierZero: Director of Engineering, Niantic, Inc.
- Overlapped before Cognition with other Cognition people at: Meta (https://www.autumn.ai/resources/cognition/worked-together)

## Identity
- LinkedIn: https://www.linkedin.com/in/anhangzhu
- X: @anhangz
- GitHub: https://github.com/anhang
- Website: https://medium.com/@anhangzhu
- Domain: cognition.ai

## Notes
- Launched Devin Oncall on 2026-10-15: "Devin Oncall is finally here! We took all of our learnings over the last two years around making agents good at resolving production issues, and taught Devin to do it all.  Self-driving software is here." This is TierZero's product rebuilt inside Devin about three months after the acquisition. (https://x.com/anhangz/status/2110795526207910036)
- Co-founded TierZero AI with Yun Park in May 2024 (CEO); Cognition acquired it, announced 2026-07-20. LinkedIn lists customers Brex, Discord, Drata, Framer, Speak and WeightWatchers. (https://cognition.com/blog/welcoming-tierzero)
- Accel led TierZero's seed round ('We led the seed round in TierZero last year'); Accel partner Ivan Zhou wrote the acquisition post and was previously Anhang's co-founder at Mayhem. (https://www.accel.com/news/cognition-acquires-tierzero-building-the-autonomous-engineering-agent)
- Cognition's acquisition framing: 'Together, we're bringing these capabilities and more to Devin Automations'. (https://cognition.com/blog/welcoming-tierzero)
- In his Medium post 'TierZero is joining Cognition!' he wrote: "Devin writes code. TierZero investigates issues. We started noticing more and more of our customers pairing the two together on their own." and "If agents are generating the code, agents should be on call." (https://medium.com/@anhangzhu/tierzero-is-joining-cognition-3969d153aa4a)
- Founding story: four months into Facebook in 2011 the ads system went down pre-IPO while he held the pager; watching Facebook's internal auto-remediation tools turn panic into process is the origin of TierZero. Years later an incident at Niantic without such tooling meant 'a full week on all-hands cleanup' and 'refunded hundreds of thousands of dollars'. (https://medium.com/@anhangzhu/tierzero-is-joining-cognition-3969d153aa4a)
- LinkedIn launch post for Devin Oncall (2026-10-15) promised deep dives on 'The "Bitter Lesson" of AI SRE', 'How Devin learns your systems and gets better with every incident' and 'How to skip 60% of repeat alerts and still flag what's new'. (https://www.linkedin.com/posts/anhangzhu_today-we-are-launching-devin-oncall-putting-activity-7516564672339238912-fCu7)
- SREGym's Jackson Clark credited 'Anhang Z., Yun Park, and Jake Rachleff' for the Devin Oncall release when Cognition took the #1 spot on SREGym, naming Jake Rachleff as a Cognition collaborator on the launch. (https://www.linkedin.com/posts/jackson-clark-5a3b90180_introducing-devin-oncall-devin-automatically-ugcPost-7516565718759374849-N6vf)
- On 2026-09-09 he posted: "It's been so much fun building at @cognition, and there's so so much more to be built. The world needs more software!  Also, somehow this is now my 4th @Accel company!" (Mayhem, Niantic investment lineage via Accel, TierZero, Cognition). (https://x.com/anhangz/status/2097516441842876900)
- On 2026-08-20 he posted on LinkedIn: "In hindsight, the signs were there all along. The path to building something big and important is to build something small and important, assemble the absolute smartest people, solve challenging problems for customers, work really hard, and have an ungodly amount of fun doing it. Cognition is just inevitable. #DoItAllWithDevin" (https://www.linkedin.com/posts/anhangzhu_doitallwithdevin-activity-7496218498369683456--aya)
- TierZero traction at acquisition: 'more than 10,000 engineers at fast-moving companies like Brex, Discord, Drata, and Speak rely on TierZero'; user sentiment jumped from a 3:1 to 30:1 thumbs-up ratio when newer models arrived late 2025. (https://medium.com/@anhangzhu/tierzero-is-joining-cognition-3969d153aa4a)
- Facebook software engineer 2011-2017: LinkedIn says 'Founding team of ReactJS. Shipped the world's first production-grade React app' and later Tech Lead for Facebook Business Manager & Business Identity; Accel's post repeats the ReactJS founding-team claim. (https://www.linkedin.com/in/anhangzhu)
- Co-founder Yun Park spent about nine years at Databricks (engineer #25, joined 2015), most recently leading the AI Serving and Ops team / AI agents framework; Ivan Zhou's friendship with Yun dates to Berkeley. (https://www.accel.com/news/cognition-acquires-tierzero-building-the-autonomous-engineering-agent)
- Director of Engineering at Niantic (Dec 2020 - Jan 2024): led infra and product for Niantic Campfire, Niantic Wayfarer, Identity, Trust & Safety, Social Platform, and Live Events. (https://www.linkedin.com/in/anhangzhu)
- CTO & co-founder of Mayhem.gg (2017-2020) with Ivan Zhou; YC W18, Series A from Accel, acquired by Niantic. LinkedIn: 'Built the best real-time AI coach for competitive gamers at the time.' (https://www.ycombinator.com/companies/mayhem)
- Public headline says "Building Cognition". (https://www.linkedin.com/in/anhangzhu)
- Most recent post (2026-10-28): "I thought I was moving fast with 6 cli/local agents running at once. Then I tried @DevinAI cloud agents." (https://x.com/anhangz/status/2115517900530545021)
- Thanked AngelList for being in the Devin Oncall beta (2026-10-16); AngelList's eng team publicly put Devin on its on-call rotation, and Pylon, Sentry and incident.io integrations were promoted around the same launch. (https://x.com/anhangz/status/2110949049423757492)
- Welcomed ex-Brex Art Levy to Cognition (2026-08-04): "We're really assembling the avengers here - welcome to the team, Art!"; Brex was also a TierZero customer. (https://x.com/anhangz/status/2084778244931473873)
- - Building Devin at Cognition.
- Prev co-founded TierZero (acquired by Cognition), enterprise AI SRE agents.
- Prev co-founded Mayhem (acquired by Niantic) and was engineering lead for Niantic platform.
- Built the first React app.
- Producer of Emmy Award–winning film; this comes from the profile summary and preserves the person's own positioning. (https://www.linkedin.com/in/anhangzhu)
- Pre-acquisition TierZero LinkedIn posting (Apr 2026) focused on on-call culture: 'I've responded to hundreds of production incidents. The ones at companies that have it together feel completely different.' (https://www.linkedin.com/posts/anhangzhu_ive-responded-to-hundreds-of-production-activity-7451988302515298304-seY_)
- Mayhem previously operated as Visor, a real-time Overwatch coaching tool; GamesBeat coverage lists Y Combinator, Afore Capital and NextGen Venture Partners as investors. (https://gamesbeat.com/visor-analyzes-your-overwatch-game-in-real-time-for-instantaneous-advice/)
- GitHub account github.com/anhang (created 2010, San Francisco) shows 0 public repositories and 25 followers. (https://github.com/anhang)
- Previous roles include CEO & Co-founder at TierZero AI; Director of Engineering at Niantic, Inc.; CTO & Co-founder at Mayhem.gg; Software Engineer at Facebook. (https://www.linkedin.com/in/anhangzhu)
- Education history includes Winter 2018, Mayhem.gg, Y Combinator; Bachelor of Science, Electrical Engineering and Computer Science, University of California, Berkeley. (https://www.linkedin.com/in/anhangzhu)
- Education: B.S. Electrical Engineering and Computer Science, UC Berkeley. (https://www.linkedin.com/in/anhangzhu)
- Crunchbase lists him as a Venture Partner at NextGen Venture Partners, an investor in Mayhem. (https://www.crunchbase.com/person/anhang-zhu)
- Location is San Francisco, California, United States. (https://www.linkedin.com/in/anhangzhu)

## Experience
- Special Projects at Cognition (Jun 2026 - Present): Product, engineering, and GTM lead for Devin Automations and Devin Oncall
- CEO & Co-founder at TierZero AI - San Francisco, California, United States (May 2024 - Jun 2026): Acquired by Cognition. TierZero helps engineering teams run production systems reliably at scale. Customers include Brex, Discord, Drata, Framer, Speak, and WeightWatchers.
- Director of Engineering at Niantic, Inc. - San Francisco, California, United States (Dec 2020 - Jan 2024): Led infra and product for Niantic Campfire, Niantic Wayfarer, Identity, Trust & Safety, Social Platform, and Live Events.
- CTO & Co-founder at Mayhem.gg - San Francisco, California, United States (Jan 2017 - Jan 2020): Acquired by Niantic. YC W18, Series A from Accel. Built the best real-time AI coach for competitive gamers at the time.
- Software Engineer at Facebook - Menlo Park, California, United States (Jan 2011 - Jan 2017): Founding team of ReactJS. Shipped the world's first production-grade React app. 
Tech Lead for Facebook Business Manager & Business Identity.

## Education
- Y Combinator - Winter 2018, Mayhem.gg - (Jan 2018 - Jan 2018)
- University of California, Berkeley - Bachelor of Science, Electrical Engineering and Computer Science

## Sources
- https://www.linkedin.com/in/anhangzhu
- https://x.com/anhangz
- https://cognition.com/blog/welcoming-tierzero
- https://github.com/anhang
- https://www.linkedin.com/in/jackson-clark-5a3b90180?miniProfileUrn=urn%3Ali%3Afsd_profile%3AACoAACrjoEsBNCOdUbVRh9Q9NO4XlD82JbiAc4s
- https://podcastaddict.com/podcast/engineering-founders/3813021
- https://medium.com/@anhangzhu/3969d153aa4a
- https://www.ycombinator.com/companies/mayhem
- https://www.accel.com/news/cognition-acquires-tierzero-building-the-autonomous-engineering-agent
- https://medium.com/@anhangzhu
- https://www.tierzero.ai/blog/authors/anhang-zhu/
- https://x.com/anhangz/status/2110795526207910036
- https://medium.com/@anhangzhu/tierzero-is-joining-cognition-3969d153aa4a
- https://www.linkedin.com/posts/anhangzhu_today-we-are-launching-devin-oncall-putting-activity-7516564672339238912-fCu7
- https://www.linkedin.com/posts/jackson-clark-5a3b90180_introducing-devin-oncall-devin-automatically-ugcPost-7516565718759374849-N6vf
- https://x.com/anhangz/status/2097516441842876900
- https://www.linkedin.com/posts/anhangzhu_doitallwithdevin-activity-7496218498369683456--aya
- https://x.com/anhangz/status/2115517900530545021
- https://x.com/anhangz/status/2110949049423757492
- https://x.com/anhangz/status/2084778244931473873
- https://engineering-founders.simplecast.com/episodes/determining-when-to-leave-to-start-your-own-company-making-strategic-bets-and-selling-to-enterprise-customers-anhang-zhu-tierzero
- https://www.linkedin.com/posts/anhangzhu_ive-responded-to-hundreds-of-production-activity-7451988302515298304-seY_
- https://gamesbeat.com/visor-analyzes-your-overwatch-game-in-real-time-for-instantaneous-advice/
- https://www.crunchbase.com/person/anhang-zhu


Researched with Autumn (https://www.autumn.ai) from public sources. Updated 2026-11-04. Profile: https://www.autumn.ai/resources/cognition/people/anhang-zhu · Everyone at Cognition: https://www.autumn.ai/resources/cognition/people