John Kim
About John Kim
John Kim is based in San Mateo, California. He is Co-Founder and CEO of Sendbird, which Crunchbase and PitchBook describe him as leading as CEO of its AI Agent Workforce. Sendbird was founded in 2013 and went through Y Combinator in the Winter 2016 batch. It began as a chat and messaging API for apps and now sells omnichannel AI agents for customer service. Tracxn lists total funding of about $218M, with a $100M Series C in March 2021. Investors include ICONIQ Capital, Tiger Global, SoftBank Vision Fund, Meritech, Emergence, WiL, Shasta, August Capital and Y Combinator.
Before Sendbird, Kim founded and ran Paprika Lab, a social gaming company. Press and data profiles say GREE acquired it in 2012. Tracxn also lists a third founded company, Smile Family. Crunchbase counts four companies founded in total.
Kim studied Computer Science and Engineering at Seoul National University and graduated from Stanford Graduate School of Business. His own site says he has advised three South Korean presidents on startup regulation and has given guest lectures at Stanford GSB and Seoul National University. Crunchbase lists a Best Mobile Technology Award, an Entrepreneur of the Year Award and a Young Entrepreneur of the Year award. He also describes himself as a former top-ranked Unreal Tournament pro gamer in Korea.
Crunchbase counts 16 investments in 16 portfolio companies, with 0 lead investments and 1 exit (none by IPO). PitchBook lists him as an active individual angel with 31 investments, 21 portfolio companies and 10 exits. The two databases count differently, so treat the totals as approximate. Both data sets show he usually joins rounds that others lead.
Dated deals in public databases run from 2019 to 2026. They include Embrace (December 2019), Quaise Energy (June 2022), TwelveLabs (December 2022), Devyce and Fuelfinance (early 2023), Openlayer (April 2023), Hubble Network (August 2023), Syncly (November 2023), Not Diamond (July 2024) and Nango (April 2026).
Kim also writes as a General Partner at Valon Capital/ASQ. His site, Positive Tenacity, collects notes on building and investing in startups.
AI is the main theme in his own description of his investing. His X bio says he invests in high-agency founders in AI and deep tech through Valon Capital. His site lists AI and productivity among Valon's focus areas.
Several recent database entries are AI or developer tooling companies. PitchBook records Not Diamond (July 2024) and Nango (April 2026) as software development applications. It records Openlayer (April 2023) and TwelveLabs (December 2022) as business and productivity software. Nango's April 2026 deal is listed as a seed round.
On the operating side, Kim has said Sendbird is model-agnostic and works with several large language model providers rather than building its own. Founders building AI products that sit on top of enterprise customer communication may find that context relevant.
His site says he invests in AI and productivity, B2B, deep tech, healthcare and fintech startups. His X bio adds an interest in brain, space, energy, longevity and complexity. Tracxn lists his top sectors as enterprise applications and enterprise infrastructure, with investments in the United States and United Kingdom.
The dated deals in public databases are mostly pre-seed and seed rounds, with a few early-stage venture rounds. Examples are Syncly ($3.3M seed, 2023), Devyce ($2.7M seed, 2023) and Fuelfinance ($1M seed, 2023). PitchBook lists his status as actively seeking new investments.
His check size is not public, and neither is any formal thesis beyond the sectors above. Founders should not assume a range.
- Nango: seed round listed April 2026, categorized as software development applications.
- Not Diamond: listed July 2024, categorized as software development applications.
- Hubble Network: listed August 2023, categorized as wireless communications equipment.
- Openlayer: listed April 2023, categorized as business and productivity software.
- Devyce: seed round of $2.7M in February 2023, alongside Y Combinator and Garage Capital.
- TwelveLabs: listed December 2022, categorized as business and productivity software.
- Quaise Energy: early-stage venture round listed June 2022, categorized as energy production.
- Syncly: $3.3M seed round in November 2023, with SBVA and Fast Ventures among co-investors.
- Fuelfinance: $1M seed round in January 2023.
- Embrace: investment listed December 2019.
- crunchbase.com/person/john-s-kim
- positivetenacity.com/about
- x.com/doshkim
- linkedin.com/in/doshkim
- pitchbook.com/profiles/investor/106328-89
- tracxn.com/d/people/john-kim/__0qI9nFsnJf35p_518Zd-1zmggnaCEFfppZ_FGJX
- tracxn.com/d/companies/sendbird/__Rze4oL3zTjeyKPX388oVGjjkXKGcTPW3Pv9F
- unite.ai/john-kim-co-founder-and-ceo-of-sendbird-interview-series
Investing activity
John Kim has made 16 investments according to Crunchbase across 16 portfolio companies, and has seen 1 exit and founded 4 companies.
John Kim appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $5M. The most recent is Nango (Seed, $4.5M, Mar 2026).
John Kim most often invests alongside Gradient Ventures, Akshay Kothari, Youcef Es-skouri and Y Combinator, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about John Kim
Does John Kim invest in AI startups?
Yes. His X bio says he invests in high-agency founders in AI and deep tech. His site lists AI and productivity among the areas he backs. Database records show AI and developer tooling deals such as Not Diamond, Openlayer, TwelveLabs and Nango.
What is John Kim's check size?
It is not public. No source reviewed states a typical check size, so founders should ask him directly.
What stage does John Kim invest in?
Public deal records show mostly pre-seed and seed rounds, with a few early-stage venture rounds. Examples are the Syncly, Devyce and Fuelfinance seeds in 2023 and the Nango seed in 2026. Crunchbase shows no lead investments, so he usually joins rounds led by others.
Who is John Kim of Sendbird?
He is Co-Founder and CEO of Sendbird, a Y Combinator W16 company that sells AI agents for customer service. He previously founded the gaming company Paprika Lab. He holds degrees from Seoul National University and Stanford GSB.
How can founders contact John Kim?
His public channels are LinkedIn, X (@doshkim) and his site, positivetenacity.com. No source reviewed gives a dedicated pitch process.
Is John Kim a venture capital partner as well as an angel?
His site and a speaker bio say he is a General Partner at Valon Capital/ASQ, which focuses on AI, B2B, deep tech, healthcare and fintech. Databases separately list him as an individual angel investor.
Is John Kim an angel investor?
Yes. John Kim invests personally as an angel and is Co-Founder & CEO at Sendbird. Crunchbase counts 16 investments and 1 exit.
What AI companies has John Kim invested in?
John Kim's AI investments include Nango. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
Where is John Kim based?
John Kim is based in San Mateo, California, United States.
What stage does John Kim invest at?
In the rounds tracked on Lounge, John Kim has invested at Seed, with a median round of $5M.