James Lindenbaum
Part Time Partner @ Heavybit
San Francisco, United States
James Lindenbaum is a seed investor at Heavybit in San Francisco focused on Software and SaaS. James is a hacker and serial entrepreneur with a background in product development, user experience design, platform marketing, and cloud technology. He is one of the founders of Heroku, an advanced platform for application development and deployment. James is known as an "OCD perfectionist", and is chiefly responsible for the look andfeel of Heroku’s brand and products. Following Heroku's acquisition by salesforce.com, James founded Heavybit, a San Francisco-based community and program for developer-focused businesses.He speaks regularly about cloud technology, entrepreneurship, and design, and is an advisor to and investor in many technology companies.
- Total investments:
- 22
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries James Lindenbaum invests in
Stages James Lindenbaum invests in
Countries James Lindenbaum invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $1M–$6.6M
- Series A
- $2M–$28M
Investment Focus
Industry
- Software 10 (45%)
- SaaS 4 (18%)
- Developer APIs 4 (18%)
- Cloud Computing 4 (18%)
- Developer Tools 4 (18%)
Stage
- Seed 11 (50%)
- Series A 5 (23%)
- Series B 2 (9%)
- Venture - Series Unknown 2 (9%)
- Angel 1 (5%)
Country
- United States 15 (68%)
- Israel 1 (5%)
- United Kingdom 1 (5%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Brand.ai is automatically maintainable UI components style guide. Brand provides tools and integrations to upgrade its users’ systems from reference sites to living products that integrates with their team’s existing workflows. The company offers its users with design asset management, sketch UI library sync, cross-platform style data export,documentation integration, and MS office integration services. It establishes a centralized repository system for its users’ design assets and it allows its users to get designs directly in the tools they already use. It also allows its users to share UI components and styles with its users’ teams. It pushes design library updates to their teams that all individuals can use the updated version in sketch.Brand is a U.S.-based company that was founded in 2014. | $5.2M / Seed / Oct 01, 2024 | ||
| Appwrite cuts up to 70% of the time and costs required for building a modern application. We abstract and simplify common development tasks behind a REST APIs, to help you develop your app in a fast and secure way. | $10M / Seed / Sep 28, 2021 | ||
| MobileCoin is a cryptocurrency platform that develops P2P payment tokens and digital payment systems for mobile. It combines privacy, security, and distributed trust with a great user experience. MobileCoin is designed so that a mobile messaging application like WhatsApp, Facebook Messenger, or Signal could integrate with a MobileCoin wallet. | $66M / Series B / Aug 18, 2021 | ||
| Blockdaemon is a blockchain deployment facilitator that manages nodes and payment rails for blockchain networks. Their solution is fully portable, it allows its user to switch networks and chains with the click of a button, so they don't have to worry about picking the perfect network configuration from day one. They support the blockchaindeveloper ecosystem with best-of-breed dev-ops advice. Blockdaemon was incorporated in 2017 and is headquartered in Los Angeles, California. | $28M / Series A / Jun 08, 2021 | ||
| Doppler is the secrets management platform built for security and DevOps. It eliminates hardcoded secrets, secrets sprawl, and unauthorized access by centralizing storage, automating secret rotation, and providing real-time monitoring. Security teams gain audit logs, anomaly detection, and compliance controls to meet SOC 2 and HIPAA standards,while DevOps benefits from automated syncs across CI/CD, cloud, and infrastructure. With granular access controls and instant secret updates, teams prevent downtime, reduce risk, and move faster. Whether securing data, cloud workloads, or internal applications, Doppler ensures secrets stay protected, available, and compliant so you can ship with confidence.It was founded in 2018 and is based in San Francisco, California. | $6.5M / Venture - Series Unknown / Mar 04, 2021 | ||
| Blockdaemon is a blockchain deployment facilitator that manages nodes and payment rails for blockchain networks. Their solution is fully portable, it allows its user to switch networks and chains with the click of a button, so they don't have to worry about picking the perfect network configuration from day one. They support the blockchaindeveloper ecosystem with best-of-breed dev-ops advice. Blockdaemon was incorporated in 2017 and is headquartered in Los Angeles, California. | $5.5M / Venture - Series Unknown / May 12, 2020 | ||
| Freedom Robotics is a software company that creates powerful control and monitoring software for modern robotics companies.It also creates mission-critical software infrastructure to enable the next generation of robotics companies to build, operate, support, and scale robots and robotic fleets. The company offers is designed for out-of-the-boxoperation, with businesses able to customize the offering using its API. Freedom Robotics enables operators to orchestrate fleets of machines from desktops, smartphones, or via an API. It also provides the building blocks for operating, prototyping, scaling, and building robot fleets.Freedom Robotics was founded in 2018 by Dimitri Onistsuk, Hans Lee, and Joshua Wilson and is headquartered in San Francisco, California, USA. | $6.6M / Seed / Jul 23, 2019 | ||
| Blockdaemon is a blockchain deployment facilitator that manages nodes and payment rails for blockchain networks. Their solution is fully portable, it allows its user to switch networks and chains with the click of a button, so they don't have to worry about picking the perfect network configuration from day one. They support the blockchaindeveloper ecosystem with best-of-breed dev-ops advice. Blockdaemon was incorporated in 2017 and is headquartered in Los Angeles, California. | $380K / Seed / Apr 11, 2018 | ||
| Blockdaemon is a blockchain deployment facilitator that manages nodes and payment rails for blockchain networks. Their solution is fully portable, it allows its user to switch networks and chains with the click of a button, so they don't have to worry about picking the perfect network configuration from day one. They support the blockchaindeveloper ecosystem with best-of-breed dev-ops advice. Blockdaemon was incorporated in 2017 and is headquartered in Los Angeles, California. | Seed / Mar 06, 2018 | ||
| Mux is building the future of online video infrastructure. They started off by building Mux Data, a best-in-class performance analytics tool that’s trusted by developers at companies like Vimeo, Robinhood, CBS Interactive, Discovery, PBS, and TED. Billions of monitored streams later, they launched Mux Video, a simple API for video hosting,encoding, and streaming. Take any video file or live stream and make it play beautifully at scale on any device, powered by magical-feeling features like automatic thumbnails, animated GIFs, and data-driven encoding decisions.Mux measures the performance metrics that actually matter to viewers: rebuffering, startup time, video quality, and errors. Its intuitive dashboard quickly gives users the insight to find issues and make improvements through features like A/B testing, industry-wide scores, alerts, and detailed information about every single video view. | $9M / Series A / Apr 18, 2017 | ||
| See all 22 investments → | |||
Co-Investors
About Heavybit
Heavybit is the leading early-stage investor in enterprise infrastructure. Since 2013, we've helped launch and scale visionary technical startups—from DevSecOps and feature flagging to AI code generation and beyond. We go hands-on from day 0, backing founders as they turn code into companies and build the future of software from the bottom up to the top down.
Heavybit Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Craig Kerstiens
Program Advisor
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Jeremy LaTrasse
Investor
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Andrea Echstenkamper
VP of Marketing
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Brian Douglas
Podcast Host
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Dana Oshiro
General Partner
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FAQ
What does James Lindenbaum invest in?
James Lindenbaum invests primarily in Software, SaaS and Developer APIs startups, most often at Seed and Series A stage. Most of the 22 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does James Lindenbaum invest in?
James Lindenbaum typically joins rounds of $1M–$6.6M at Seed and $2M–$28M at Series A. These are whole funding-round sizes, not James Lindenbaum's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds James Lindenbaum took part in.
How do I contact James Lindenbaum?
For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did James Lindenbaum last invest?
The most recent investment recorded for James Lindenbaum closed in Oct 2024. Shizune tracks 22 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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