# Jake Rachleff

![Jake Rachleff](/resources/cognition/portraits/jake-rachleff.webp)

Building Devin  
Cognition  
Mill Valley, California, United States

## At Cognition

- Role: Member of Technical Staff (Engineering)
- Joined: Sep 2025
- How they joined: With TierZero (https://www.autumn.ai/resources/cognition/acquisitions/tierzero)
- Before TierZero: Product & Engineering, LangChain
- Overlapped before Cognition with other Cognition people at: Stanford University; Dropbox; Databricks (https://www.autumn.ai/resources/cognition/worked-together)

## Identity
- LinkedIn: https://www.linkedin.com/in/jakerachleff
- X: @jake_rachleff
- GitHub: https://github.com/jakerachleff
- Domain: cognition.ai

## Notes
- Co-authored Cognition's 'Introducing Devin Oncall' launch post (2026-10-15). The post announces an agent that investigates alerts and bug reports and reports 100% end-to-end success on the SREGym benchmark. It was the first major product his former TierZero team shipped inside Cognition. (https://devin.ai/blog/introducing-devin-oncall)
- Posted on X, word for word: "Excited by our team's first major product launch since joining @cognition from @TierZeroHQ Devin Oncall is helping teams across Silicon Valley and the Fortune 500 sleep easier and focus on building products. Read the blog to learn more." (https://x.com/jake_rachleff/status/2110801055542034920)
- Posted on LinkedIn, word for word: "Excited to share some of what our team has been working on at Cognition over the past few months. Devin is a great coding agent, and Devin Oncall handles your toughest incidents, alerts, and bug reports. Try it out!" (https://www.linkedin.com/posts/jakerachleff_introducing-devin-oncall-devin-automatically-activity-7516558065396109313-8Fnc)
- TierZero co-founder Anhang Zhu announced that TierZero was joining Cognition, writing that he and Yun Park had set out two years earlier to 'make software self-driving', with customers including Brex, Discord, Drata and Speak. Zhu tagged Rachleff among the 'real MVPs' who built the company, alongside Jeff Yan, Tianyi Huang, Edward Wu, Eric Yuan, Kevin Delgado and Dan Code-McNeil. (https://www.linkedin.com/posts/anhangzhu_two-years-ago-yun-park-and-i-set-out-to-activity-7485064126508212224-90UF)
- His Cognition role description reads "Building automated background agents" and "Joined via TierZero acquisition" (MTS since Jun 2026). Together with the Oncall launch. (https://www.linkedin.com/in/jakerachleff)
- Cognition's post 'Welcoming TierZero to Cognition' welcomes 'Anhang, Yun, and the TierZero team', confirming the acquisition through which Rachleff joined. (https://cognition.com/blog/welcoming-tierzero)
- Founding Software Engineer at TierZero (Sep 2025 - Jun 2026), a seed-stage startup co-founded by Anhang Zhu and Yun Park that built agents to automate production engineering. Zhu also ran teams at Databricks. (https://www.linkedin.com/in/jakerachleff)
- At LangChain (Oct 2023 - Dec 2024, Seattle) he was 'Product + Eng Lead within LangSmith, employee 17'. (https://www.linkedin.com/in/jakerachleff)
- Profile headline reads 'Building Devin'. (https://www.linkedin.com/in/jakerachleff)
- LinkedIn hiring post, word for word in part: "TierZero is actively hiring engineers who care about making engineering a more fun job in the future. We're building out agents to automate all the tedious parts of the job (incident response, support, you name it)." (https://www.linkedin.com/posts/jakerachleff_tierzero-is-actively-hiring-engineers-who-activity-7395165135507636224-RSIt)
- Named to Exceptional Capital's 2024 Exceptional 100 as a LangChain software engineer with prior roles at Databricks, Dropbox and Uber. (https://www.exceptionalcap.com/exceptional100_2024)
- Databricks' 'Announcing Databricks Seattle R&D Site' post introduced him as 'a tech lead in the networking team' among the engineers seeding the Seattle office. (https://www.databricks.com/blog/2021/11/22/announcing-databricks-seattle-rd-site.html)
- At Databricks (Aug 2018 - Nov 2023) he was a Senior Software Engineer and tech lead in the Platform and Machine Learning organizations. (https://www.linkedin.com/in/jakerachleff)
- When Devin Oncall took #1 on SREGym, Jackson Clark publicly congratulated Rachleff for 'an amazing release pushing the frontier'. (https://www.linkedin.com/posts/jackson-clark-5a3b90180_huge-congrats-to-cognition-for-taking-the-activity-7516565719656878080-2nRV)
- LinkedIn post: "Fun to get to use LangSmith as a customer now - great product that's been super useful for building out agents at TierZero!" This links his LangChain past to his TierZero agent work. (https://www.linkedin.com/posts/jakerachleff_langsmith-for-startups-spotlight-tierzero-activity-7432850365164773376-ArYw)
- Co-authored the Databricks blog post 'Private Databricks Workspaces With AWS PrivateLink Is in Public Preview' with Abhinav Garg. (https://www.databricks.com/blog/2021/04/23/private-databricks-workspaces-with-aws-privatelink-is-in-public-preview.html)
- Personal GitHub jakerachleff hosts student-era systems projects (tinytorrent, simple-kademlia, commentzwalter, foodtruckFinder) and simple-langserve-serving-example from his LangChain period. (https://github.com/jakerachleff)
- Commented on Harrison Chase's LangChain funding post, in part: "congrats on the new funding! Fun to get to go from employee -> custom[er]", a nod to his move from LangChain employee to LangSmith customer at TierZero. (https://www.linkedin.com/posts/harrison-chase-961287118_today-were-excited-to-announce-new-funding-activity-7386446903250608128-vWzN)
- Listed as a participant ('Software Engineer @ Langchain') in the AI Tinkerers Seattle Humans-in-the-Loop Hackathon with Anthropic. (https://seattle.aitinkerers.org/p/ai-tinkerers-humans-in-the-loop-hackathon-with-anthropic)
- Stanford BS (2013-2017) and MS (2017-2018) in Computer Science, with an MS focus in Artificial Intelligence. (https://www.linkedin.com/in/jakerachleff)
- Interned as a software engineer at Uber (summer 2015) and Dropbox (summer 2016) while at Stanford. (https://www.linkedin.com/in/jakerachleff)
- His X account (created January 2022, about 21 followers) follows TierZero co-founder Yun Park, @TierZeroHQ and Jackson Clark, alongside Seattle civic and transit accounts (Seattle Subway, The Urbanist, Seattle Times) and ML figures such as Karpathy, LeCun and Jure Leskovec. (https://x.com/jake_rachleff)
- Used a separate work GitHub account, jakerachleff-databricks, during his Databricks years. (https://github.com/jakerachleff-databricks)
- Based in Mill Valley, California, after Seattle years with the Databricks Seattle site and LangChain. (https://www.linkedin.com/in/jakerachleff)
- Credited by name in a scalastyle issue thread about parsing trailing commas. (https://github.com/scalastyle/scalastyle/issues/276)

## Experience
- Member of Technical Staff at Cognition - San Francisco, CA (Jun 2026 - Present): Building automated background agents
Joined via TierZero acquisition
- Founding Software Engineer at TierZero - San Francisco, CA (Sep 2025 - Jun 2026): Acquired by Cognition
- Product & Engineering at LangChain - Seattle, WA (Oct 2023 - Dec 2024): Product + Eng Lead within LangSmith, employee 17
- Senior Software Engineer at Databricks - San Francisco Bay Area (Aug 2018 - Nov 2023): Tech Lead in the Platform and Machine Learning organizations
- Software Engineering Intern at Dropbox - San Francisco Bay Area (Jun 2016 - Sep 2016)
- Software Engineering Intern at Uber - San Francisco Bay Area (Jun 2015 - Sep 2015)

## Education
- Stanford University - Master of Science - MS, Computer Science - (Jan 2017 - Jan 2018): Focus in Artificial Intelligence
- Stanford University - Bachelor of Science (B.S.), Computer Science - (Jan 2013 - Jan 2017)

## Sources
- https://www.linkedin.com/in/jakerachleff
- https://devin.ai/blog/introducing-devin-oncall
- https://x.com/jake_rachleff/status/2110801055542034920
- https://www.linkedin.com/in/jakerachleff?miniProfileUrn=urn%3Ali%3Afsd_profile%3AACoAAAuP8aIByNQEWcC0sO3da7-MFKorwhBplvo
- https://www.linkedin.com/posts/anhangzhu_two-years-ago-yun-park-and-i-set-out-to-activity-7485064126508212224-90UF
- https://github.com/jakerachleff
- https://github.com/jakerachleff-databricks
- https://www.databricks.com/blog/2021/11/22/announcing-databricks-seattle-rd-site.html
- https://www.databricks.com/blog/2021/04/23/private-databricks-workspaces-with-aws-privatelink-is-in-public-preview.html
- https://www.exceptionalcap.com/exceptional100_2024
- https://seattle.aitinkerers.org/p/ai-tinkerers-humans-in-the-loop-hackathon-with-anthropic
- https://github.com/jakerachleff/tinytorrent
- https://cognition.com/blog/welcoming-tierzero
- https://www.linkedin.com/posts/jackson-clark-5a3b90180_huge-congrats-to-cognition-for-taking-the-activity-7516565719656878080-2nRV
- https://github.com/scalastyle/scalastyle/issues/276
- https://www.linkedin.com/posts/harrison-chase-961287118_today-were-excited-to-announce-new-funding-activity-7386446903250608128-vWzN
- https://x.com/HacksonClark
- https://x.com/jake_rachleff
- https://api.github.com/users/jakerachleff
- https://www.linkedin.com/in/charlotte-li-a00884332
- https://www.linkedin.com/posts/jakerachleff_introducing-devin-oncall-devin-automatically-activity-7516558065396109313-8Fnc
- https://www.linkedin.com/posts/jakerachleff_tierzero-is-actively-hiring-engineers-who-activity-7395165135507636224-RSIt
- https://www.linkedin.com/posts/jakerachleff_langsmith-for-startups-spotlight-tierzero-activity-7432850365164773376-ArYw


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