We are early stage investors who run a go-to-market program for founders.

Joined February 2012
Photos and videos
First Harmonic retweeted
We @firstharmonic are proud to co-lead @PoeticHQ's Series A round. Founders come in all shapes and sizes, but few come with as much light, passion, and energy as @markiewagner. She has built one of the most talent dense teams I’ve seen, and together they have built a breakthrough product that is already loved across the Fortune 500. @PoeticHQ has built the first product that combines the intelligence of agents with the reliability of code. This architecture will revolutionize how companies run by turning process into software at every large company in the world
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First Harmonic retweeted
@firstharmonic is proud to co-lead @PoeticHQ's Series A round. Founders come in all shapes and sizes, but few come with as much light, passion, and energy as @markiewagner. She has built one of the most talent dense teams I’ve seen, and together they have built a breakthrough product that is already loved across the Fortune 500. @PoeticHQ has built the first product that combines the intelligence of agents with the reliability of code. This architecture will revolutionize how companies run by turning process into software at every large company in the world.
Introducing @PoeticHQ: a new AI system that executes complex multi-hour tasks with 99% accuracy and 10x fewer tokens than agents. We raised $50M at $500M from Kleiner Perkins, Founders Fund, First Harmonic, and Genius Ventures to build AI that does complex work inside Fortune 500 companies without hallucination. While code is too brittle, agents are too unpredictable. The work that runs the global economy - anti-money laundering, fraud investigations, underwriting - needs extreme accuracy. So we built a new kind of software that pairs the flexibility of AI with the predictability of code. When the world stays the same, Poetic runs fixed code: fast, cheap, identical every time. When the world changes, Poetic uses AI to regenerate its approach and find its way back to the objective. In one year, we went from zero to an eight-figure run rate as a team of four. Since then, we’ve scaled the team and executed the highest-stakes processes at AIG, SoFi, and Chime. At SoFi, a large US bank, Poetic reached 99% quality on fraud investigations in five weeks.
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First Harmonic retweeted
One of my favorite evenings in recent memory. We hosted 40 of SF’s best engineers at our Builders Table dinner with @bcherny, @mikeyk, and members of the Claude Code team. We took a quick poll in the middle of dinner on some topics, and we had some interesting results: 1) It turns out that out of all the agentic coding tools out there, most folks in the room (to no surprise) trusted Claude the most 🤖 2) The next application layer unlock will come from persistent memory and better context ingestion. 3) The room was pretty split on whether there would be more or fewer software engineers in the world in 5 years. Thanks so much to the @AnthropicAI team (@kandouss, @alistaiir, @OmidMogasemi, @jwbaskerv, and especially @RazRazcle), and to everyone who spent their evening with us. If you're an engineer or researcher interested in a future @firstharmonic dinner, DM me.
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First Harmonic retweeted
We hosted a Builders Table event with leaders from @AnthropicAI last week. It was amazing to hear about their experiences using Mythos internally, managing the unprecedented growth they are seeing, and learning about new products they are hoping to build. Thanks so much to the @AnthropicAI team (@bcherny, @mikeyk, @alistaiir, @OmidMogasemi, @jwbaskerv, and especially @RazRazcle), and to the great engineers who spent their evening with us.
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First Harmonic retweeted
This was maybe my favorite Builders Table yet. We hosted @bcherny, @mikeyk, and members of the Claude Code team to talk about how coding will evolve and what it means for the day-to-day experience of engineers. 40 of SF’s top engineers came. Some results from our mid-dinner poll: 1/ The biggest coding bottleneck is verification, not model capability. 2/ The next application layer unlock will come from persistent memory and better context ingestion. 3/ The jury is out on whether there will be more or fewer engineering jobs in five years, but for now the coding "tool" people trust most after Claude is... themselves. Keep thinking indeed. Thanks so much to the @AnthropicAI team (@kandouss, @alistaiir, @OmidMogasemi, @jwbaskerv, and especially @RazRazcle), and to everyone who spent their evening with us. We're hosting another one of these next month, on the topic of AI safety. If you're an engineer or researcher and want to come, DM me!
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First Harmonic retweeted
Actively AI (@useactively) is leading an inevitable transformation in the modern sales stack. Within five years, no one will believe that sales teams used to work without per-account agents working alongside them to guide their actions with intelligence. I heard about Actively two years when a CRO told me it was the most transformative sales tool he’d ever seen. We then worked closely with @mgarimella and @agupta_108 in the @firstharmonic program and were blown away by their tenacity and commitment. We see enormous potential in their business. Today, we're very excited to co-lead Actively's Series B and help realize their vision of intelligence-led revenue.
📣 We just raised our $45M Series B from @TCVTech and @firstharmonic, with participation from @BainCapVC, @firstround, and @AlkeonCapital. Sales is the most expensive function in most companies — and one of the hardest. Hundreds of accounts, different context, different stakeholders, different dynamics, and a different path to close. No one can do that perfectly. Critical things get missed. So we gave every account its own AI agent — working 24/7, maintaining full context, progressing it through the funnel, and guiding reps and leaders on what to do next. The greatest privilege has been building alongside companies like @Samsara @tryramp @ironclad_inc and @attentiveHQ — enterprises with thousands of sellers who are already living in the future. There are only two unbounded upside problems out there: building and selling. Every company sells. and @useactively is building the system they'll all run on. We’re excited to pull every revenue team into the future we know is inevitable.
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First Harmonic retweeted
📣 We just raised our $45M Series B from @TCVTech and @firstharmonic, with participation from @BainCapVC, @firstround, and @AlkeonCapital. Sales is the most expensive function in most companies — and one of the hardest. Hundreds of accounts, different context, different stakeholders, different dynamics, and a different path to close. No one can do that perfectly. Critical things get missed. So we gave every account its own AI agent — working 24/7, maintaining full context, progressing it through the funnel, and guiding reps and leaders on what to do next. The greatest privilege has been building alongside companies like @Samsara @tryramp @ironclad_inc and @attentiveHQ — enterprises with thousands of sellers who are already living in the future. There are only two unbounded upside problems out there: building and selling. Every company sells. and @useactively is building the system they'll all run on. We’re excited to pull every revenue team into the future we know is inevitable.
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Congrats to early First Harmonic alums @handotdev, @hahnbeelee, and the team at @mintlify! We loved working with you.
We just raised a $45M Series B at a $500M valuation led by @a16z and @SalesforceVC to build the knowledge infrastructure for AI
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First Harmonic retweeted
The way we align and shape model behavior is evolving quickly. Last week, we had the pleasure of gathering SF's post-training experts from companies like @appliedcompute, @OpenAI, @cursor_ai, @thinkymachines, @mercor_ai, @cognition, @xai, @flappyairplanes, and others. Post-training is a nascent field, and I learned a ton: 1/ Reward modeling is becoming the bottleneck. The gap between what we can train models to do and what we can reliably evaluate is widening fast. 2/ The line between post-training and product is blurring. Teams that treat RLHF and fine-tuning as an afterthought are falling behind those that treat it as a core part of the product loop. 3/ Evaluation is still surprisingly artisanal. The tooling isn't where it needs to be, and there's a real opening for better infrastructure. This event was part of @firstharmonic's Builders Table series: intimated, curated dinners where you almost certainly won't be the smartest person in the room. DM me if you're interested in coming to the next one.
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First Harmonic retweeted
We hosted 30 of SF’s best engineers at our Builders Table event with @cursor_ai last week. The way we code is changing fast, and Cursor is one of the companies at the forefront. The team shared their perspectives on questions like: - Will engineers even look at their code in a year? - Will the future of coding be in the IDE, the CLI, or in something else entirely? - What will the role of an engineer look like in the future? There are many forums for founders to learn from each other, but fewer for engineers. We loved creating one and hope to do more. If you’re an engineer and interested in attending a future @firstharmonic event, DM me!
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First Harmonic retweeted
Feb 10
Excited to announce that @simpleailab has raised a $14M seed round led by @firstharmonic. For the past year, we’ve been building AI voice agents to transform direct-to-consumer sales. We fundamentally believe that voice AI is the future of all B2C calls.
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First Harmonic retweeted
Very excited to back @catheryn_li and @Zach_Kamran who are build AI agents that can sell
EXCLUSIVE: startup Simple AI has raised $14M to help customers like Omaha Steaks boost sales with AI phone reps. Is AI ushering in a voice revival? We talked to founders @catheryn_li and @Zach_Kamran -- both former YC staffers -- about what's going on. upstartsmedia.com/p/simple-a…
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First Harmonic retweeted
Huge congrats to the Artie team! Incredibly hard product to build and it's amazing what they've accomplished over the past couple years.
Announcing Artie’s $12M Series A. When Robin Tang and I started Artie, the idea was simple: make it easy to deploy real-time streaming pipelines. Streaming pipelines used to be something only a few companies could afford to build. Guaranteeing transactional integrity, handling schema evolution, recovering from failures, and keeping latency low at scale is hard. Most teams limp along with brittle systems. But today, with AI systems that make decisions, trigger workflows, and interact with customers, stale data isn’t just slow - it’s incorrect. Real-time data is becoming non-negotiable. Today, companies like ClickUp, Substack, and Alloy, are processing 700B rows of data annually with Artie to power AI/ML workloads, customer-facing analytics, and operational systems. @artie_labs is a fully managed real-time data streaming platform. We move data across systems in real time - so teams can rely on fresh, accurate data to power AI products - without building or maintaining streaming infrastructure. We raised this round to double down on a simple belief: the next generation of data infrastructure will be streaming-first. Huge thank you to @daltonc and @Standard_Cap for leading the round, with continued support from @ycombinator, @PathlightVC, and incredible angels including @arashf, @bennstancil, @chrisbest, @charleshearn, and @lennysan. I also want to thank our team, customers, and partners for supporting our mission. And thank you to Chris Metinko and @axios for capturing the exclusive story. P.S. - If you want the same streaming infrastructure that Netflix and DoorDash have, but want to skip the multi-year build - reach out.
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7 Nov 2025
agents meet optimizations @joshpxyne
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First Harmonic retweeted
First @firstharmonic alumni reunion in the books! Thanks for bringing the good vibes.
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Thanks for visiting @AntWilson @kiwicopple!
If we ever get an office I hope it vibes like this
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First Harmonic retweeted
2 Oct 2025
such a good episode with the best @ROWGHANI
2 Oct 2025
I get asked a lot what it was like to work with Steve Jobs. Probably the biggest thing I learned is that there is no "good enough" when it comes to the basics: communicating, motivating, and most importantly, thinking. Steve was obsessed with the quality of his own thinking. He was able to generate a mental map of a problem space faster and more deftly than anyone I've known because he worked at it. Over the course of a career, that skill compounds more than anything else. Thanks for the conversation @jaltma
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First Harmonic retweeted
Ali is a special operator and investor. He joined a @brexHQ all hands a few months ago, and was one of the most profound guest speakers ever. One of the learnings from working with Steve Jobs: he was obsessed with the quality of his own thinking. I’m really glad @jaltma captured some of his wisdom on a podcast. Highly recommend listening!
2 Oct 2025
I love the description of Pixar as a miracle factory. How do you create the conditions to make special outcomes more likely? @ROWGHANI helped build Pixar, working closely with Steve Jobs and Ed Catmull in their golden era. He also worked closely with the Twitter founders and then Sam at YC. He’s advised some of the best founders through his work at YC Continuity and now his own fund First Harmonic. I love talking to Ali and always learn something new. Hope you enjoy.
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First Harmonic retweeted
2 Oct 2025
I get asked a lot what it was like to work with Steve Jobs. Probably the biggest thing I learned is that there is no "good enough" when it comes to the basics: communicating, motivating, and most importantly, thinking. Steve was obsessed with the quality of his own thinking. He was able to generate a mental map of a problem space faster and more deftly than anyone I've known because he worked at it. Over the course of a career, that skill compounds more than anything else. Thanks for the conversation @jaltma
2 Oct 2025
I love the description of Pixar as a miracle factory. How do you create the conditions to make special outcomes more likely? @ROWGHANI helped build Pixar, working closely with Steve Jobs and Ed Catmull in their golden era. He also worked closely with the Twitter founders and then Sam at YC. He’s advised some of the best founders through his work at YC Continuity and now his own fund First Harmonic. I love talking to Ali and always learn something new. Hope you enjoy.
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Congrats to @unifygtm on their Series B! @austinh___ and @HeggieConnor were part of the first @firstharmonic cohort and remain a shining example of how far you can get and how quickly you can move when you are hyper-focused on the right customer.
Excited to share that we’ve raised a $40M Series B at @unifygtm to transform growth into a science. Many of the fastest growing companies like Cursor, Perplexity, Flock Safety and Airwallex choose Unify to reimagine growth in an AI-native world. This round comes just 9 months after announcing our Series A, and was led by Battery with participation from OpenAI, Thrive and Emergence 👇
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