- Joined Cognition
- Jul 2026
- How they joined
- With TierZero
- Before TierZero
- Niantic, Inc.Director of Engineering
- Status
- Current
- 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.Oct 15, 2026Devin 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.
- 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.Jul 20, 2026
- 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.Jul 20, 2026
- Cognition's acquisition framing: 'Together, we're bringing these capabilities and more to Devin Automations'.Jul 20, 2026
- 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."Jul 20, 2026
- 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'.Jul 20, 2026
- 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'.Oct 15, 2026Today we are launching Devin Oncall - putting Devin in your on-call rotation so you can sleep better at night. 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. While the product is impressive, come nerd-out with us: - The "Bitter Lesson" of AI SRE - How Devin learns your systems and gets better with every incident - How to skip 60% of repeat alerts and still flag what's new Links in comment
- 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.Oct 15, 2026
- 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).Sep 9, 2026It'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!
- 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"Aug 20, 2026In 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
- 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.Jul 20, 2026
- 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.2011
Product, engineering, and GTM lead for Devin Automations and Devin Oncall
Acquired by Cognition. TierZero helps engineering teams run production systems reliably at scale. Customers include Brex, Discord, Drata, Framer, Speak, and WeightWatchers.
Led infra and product for Niantic Campfire, Niantic Wayfarer, Identity, Trust & Safety, Social Platform, and Live Events.
Acquired by Niantic. YC W18, Series A from Accel. Built the best real-time AI coach for competitive gamers at the time.
Founding team of ReactJS. Shipped the world's first production-grade React app. Tech Lead for Facebook Business Manager & Business Identity.
Today we are launching Devin Oncall - putting Devin in your on-call rotation so you can sleep better at night. 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. While the product is impressive, come nerd-out with us: - The "Bitter Lesson" of AI SRE - How Devin learns your systems and gets better with every incident - How to skip 60% of repeat alerts and still flag what's new Links in comment
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
Two years ago, Yun Park and I set out to make software self-driving. The idea came from years of running engineering teams at Facebook, Databricks, and Niantic, and feeling the operational tax firsthand. Not just the 2am incidents, but everything around them: the bug triage, the flaky CI, the failed deploys, the endless work that keeps software healthy but never shows up on a roadmap. The gap between shipping code and keeping it running is exactly what we set out to close. Today, thousands of engineers at companies like Brex, Discord, Drata, and Speak trust TierZero to catch what breaks and
I thought I was moving fast with 6 cli/local agents running at once. Then I tried @DevinAI cloud agents. 🤯
@AngelList @cognition Thank you for being in the beta, really appreciate all the feedback!
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.
@alexkoumpas @cognition mitigation and resolution can be independently worked on by Devin!
@cognition Switch to decaf with Devin
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!
@PeterJThomson @cognition Working on it!
From auto-fixing bugs to telling me which slack message is urgent, Devin truly does everything!
I met @artlevy many years ago and my first impression was that he’s going to be an important person at Brex. Can’t believe we now work together at @cognition. We’re really assembling the avengers here - welcome to the team, Art!
