Engineering · Member of Technical Staff

Jake Rachleff

“Building Devin”

LinkedIn X GitHub

Joined Cognition: Jul 2026
How they joined: With TierZero
Before TierZero: LangChainProduct & Engineering
Status: Current

Overlapped before Cognition

Sources¹linkedin.com ²linkedin.com ³linkedin.com ⁴cognition.com

Autumn profile

Researched with Autumn · 2026-11-04

Details

LocationMill Valley, California, United States

Company sitecognition.ai

UniversityStanford University

PythonC++CJavaUnixR

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.Oct 15, 2026
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."Oct 15, 2026Excited 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://t.co/C9f0xtIooW
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!"Oct 15, 2026Excited 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!
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.Jul 20, 2026
His Cognition role description reads "Building automated background agents" and "Joined via TierZero acquisition" (MTS since Jun 2026). Together with the Oncall launch.Jun 2026
Cognition's post 'Welcoming TierZero to Cognition' welcomes 'Anhang, Yun, and the TierZero team', confirming the acquisition through which Rachleff joined.Jul 2026
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.Sep 2025
At LangChain (Oct 2023 - Dec 2024, Seattle) he was 'Product + Eng Lead within LangSmith, employee 17'.Oct 2023
Profile headline reads 'Building Devin'.2026
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)."Nov 14, 2025TierZero 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). We're a small and self motivated team where everyone is real
Named to Exceptional Capital's 2024 Exceptional 100 as a LangChain software engineer with prior roles at Databricks, Dropbox and Uber.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.Nov 22, 2021

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