About Warren Runk

Engineering leader and builder

Warren Runk

Y Combinator backed founder with 20 years industry experience, 15 building and leading high-performing technology teams

Our team at Chorus created "Luna" the AI-powered, agentic, empathetic sleep coach to help drive better outcomes

We transformed our engineering team away from human written code to intense automation, verification, and creativity

Leading with confidence and curiosity, driven by product and customer obsession

Looking for the Resume? #

A traditional one-page resume with the full rundown of roles, impact, and technologies — available as HTML or PDF for a printable version.

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Warren Runk
Engineering Leader

Something lighter #

Weew, sorry for the corp-speak

I'm also a normal human being just trying to raise great kids, have fun at work, and enjoy a lot of hockey. Also, I have become quite obsessed with Claude Code

I have a natural, often annoying predilection toward relentless curiosity and rabbit hole diving, and this has only become worse with LLMs endless provisioning of said holes. I to listen to a lot of books in an attempt to understand humans and everything around us

Apologies, but back to the formal stuff:


Experience #

Chorus Sleep (Chorus Wellness, Inc.) (YC W'21) #

Co-Founder & CTO
Jan 2021 -- Present
  • Transformed sleep health through personalized AI-driven interventions. Backed by Y Combinator, Precursor Ventures, Goat Capital. Acquired by Sleep Reset in 2026
  • Built Luna, a multi-layered AI-powered sleep coach that delivers structured, evidence-based guidance through real-time conversations and memory-informed, multi-step interventions. Novel prompt and eval process enables safe reasoning over health, sleep, and behavior data to route users to personalized experience
  • Achieved 30–37% adoption and 80% month-1 + 50–60% month-6 retention across 26 countries, driving 30% faster sleep onset, 30% fewer awakenings, and 20% better daytime functioning among hundreds of thousands of users
  • Built several internal AI systems that accelerate engineering and operations, delivering productivity equivalent to ~5+ additional headcount while maintaining lean team structure
  • Co-managed the Chorus business, including product, design, operations, and content
  • Led engineering to hire for, design, and scale end-to-end cloud-native platform with native mobile (Swift, Flutter), web, and other channels

Who What Wear (formerly Clique Brands) #

Director of Engineering
Mar 2016 -- Jan 2021 · 4 yrs 11 mos
  • Managed engineering team including front-end, back-end, and quality assurance engineers. Noted by COO as one of the most effective engineering teams he’s ever seen
  • Oversaw core platform in charge of primary websites, custom, in-house content management system, and various support systems that serve hundreds of staff and millions of customers
  • Led teams during hyper-growth cycle to design and build a novel, complex shopping app and platform supporting same-day delivery from multiple retailers
  • Worked across departments on many important initiatives to drive revenue and user growth including affiliate program, marketing, third party integrations, and more
  • Architected and led major re-platform from AWS to Google Cloud using Go and Postgres resulting in greatly reduced complexity and hosting cost by over fifty percent
  • Mentor and advocate for technical team members. Organize discussions and regularly bring new technical material for review and discussion

Boom! Payments #

Director of Engineering / Founding Engineer
Jan 2015 -- Apr 2016 · 1 yr 4 mos
  • Helped build an ecommerce focused startup from the ground up
  • Co-architected and implemented web services for use with ecommerce applications and SaaS
  • Lead the software team of developers and contractors
  • Helped CEO close deals including Toyota Financial
  • JSON REST APIs written in Go, running AWS with data stored in PostgreSQL using EC2, S3, RDS, and supporting software in Python
  • Managed and architected rich sales dashboard to help merchants grow and retain customers

Evite #

Director of Engineering
Apr 2010 -- Nov 2014 · 4 yrs 8 mos
  • Worked at Evite (online party invitations) for four and a half years in several roles including software/systems engineering and management
  • Co-managed entire technology team of software, IT, DevOps and QA engineers
  • Part of core team to redesign and build a large-scale distributed system from the bottom up to accommodate Evite’s heavy web and internal processing traffic
  • Led large data (3+ bil records) and platform migration to bring nearly fifteen years of Oracle, MySQL, Python, Java systems and data to Google App Engine and Google Cloud Services
  • Built many JSON REST APIs, internal tools, data pipelines, and other data intensive processes in Python using MySQL, NoSQL, Memcached, and many other web services
  • Learned from industry veterans on platform and web scaling in the pre-cloud era

Makena Technologies / There.com #

Software Engineer
Jan 2007 -- Mar 2010 · 3 yrs 3 mos
  • First professional software engineering job post university – a great opportunity to learn from extremely smart colleagues which was essential to building a strong technical foundation
  • Wrote web services and client code in C++ for large multiplayer online virtual world (There.com)
  • Helped maintain various backend systems and services using C++, Python, Perl and Shell/Bash
  • Wrote web apps in Python to support various game features

Education #

Y Combinator – Intense startup incubator – Winter 2021 batch. Co-Founder & CTO of Chorus Sleep.

University of California, Riverside – Bachelor of Science, Computer Science (Software Engineering, Databases, Computer Graphics). Graduated 2006.

Los Alamitos High School – Graduated 2001. Computer Science, Physics, Chemistry. Scored 4 on the AP Computer Science exam.

Connect #