E183: Why English Isn't a Programming Language - the BAML Story

E183: Why English Isn't a Programming Language - the BAML Story

Author: Robby (MTF); Tim (Essence VC) October 21, 2025 Duration: 37:26

This episode dives into why code quality still matters in the age of AI, and why English - no matter how good models get - won’t replace programming.

Our guest is Co-Founder of Boundary, Vaibhav Gupta, and he shares the journey behind BAML, a new programming language to write and manage AI logic. After 12 pivots and 3.5 years, the team realized something simple but powerful:
AI tools were evolving fast, but the code was ugly.

Most AI generated code was unnecessarily long and messy. For builders who viewed code as artistic expression, that was painful. Once they tried BAML, everything changed. It was clean, elegant - completely the opposite of AI slop.

It wasn’t an overnight success. It took nine months to reach ten users — but the early ones stayed because of thoughtful design:

  • Easy model swapping

  • Full visibility into every prompt and test case

  • A workflow so simple that non-technical users (even lawyers!) could test code

BAML was built with a philosophy that code is the source of truth, not the docs.

The conversation touches on how LLM observability and thoughtfully designed code make BAML unique. It’s inspired by the same thinking that made React sticky - beauty and composability.

Pretty code, the founder believes, isn’t vanity - it’s a functional advantage:

  • Fewer bugs

  • Easier to reason about

  • Friendlier for AI-generated systems


Building a company around open source software is a unique and often misunderstood path, full of specific challenges and rare opportunities. The Open Source Startup Podcast digs into that journey directly with the people who have navigated it, moving beyond theory to the practical realities shared in conversation. Hosts Robby and Tim bring their distinct perspectives from MTF and Essence VC to these discussions, creating a space where founders speak candidly. You’ll hear from the architects behind names like HashiCorp, MongoDB, and Vercel, as well as leaders from Chronosphere, DBT, and mobile.dev, as they unpack their experiences. This podcast focuses on the pivotal decisions around community building, monetization strategies, and maintaining project ethos under the pressures of scaling a business. Each episode serves as a detailed case study, revealing how these companies turned publicly available code into sustainable, impactful enterprises. The dialogue naturally explores the tensions between open collaboration and commercial needs, offering a real-world blueprint that is both instructive and nuanced. For anyone curious about the intersection of community-driven development and venture-scale growth, this series provides an essential and unfiltered resource.
Author: Language: English Episodes: 100

Open Source Startup Podcast
Podcast Episodes
E150: Fast Analytics with Metabase [not-audio_url] [/not-audio_url]

Duration: 39:35
Sameer Al-Sakran is CEO of Metabase, the open-source analytics and business intelligence platform. Their open source project, also called metabase, has over 38K stars on GitHub. Metabase has raised $51M from investors in…
E149: One AI Agent to Rule Them All? [not-audio_url] [/not-audio_url]

Duration: 36:16
Stanislas Polu is Co-Founder of Dust, the platform for companies to create and operate custom AI assistants for a range of use cases. Dust has raised $20M from investors including Sequoia. In this episode, we dig into th…
E148: Software Refactoring in the Age of AI [not-audio_url] [/not-audio_url]

Duration: 30:00
Jonathan Schneider is Co-Founder & CEO of Moderne, the platform for code migrations. Moderne has raised up to a Series A from investors including Intel Capital and True Ventures. In this episode, we dig into the importan…
E147: The Over-complication of API Management - What Went Wrong? [not-audio_url] [/not-audio_url]

Duration: 39:54
James Perkins is Co-Founder & CEO of Unkey, the open source API management platform that helps developers secure, manage, and scale their APIs. Their project, also called unkey, has almost 3K stars on GitHub. Unkey has r…
E146: Inventing Virtual Kubernetes Clusters [not-audio_url] [/not-audio_url]

Duration: 37:10
Lukas Gentele is Co-Founder & CEO of Loft, the platform engineering company behind "kubernetes virtualization" to reduce costs and create efficiencies for teams with high (and growing) kubernetes usage. They allow any or…
E145: Bootstrapping an Open Source Monitoring Platform [not-audio_url] [/not-audio_url]

Duration: 38:46
Aliaksandr Valialkin and Roman Khavronenko are Co-Founders of VictoriaMetrics, the open source time series database and monitoring platform built alongside their open source project, also called victoriametrics. In this…
E144: How to Straddle Developers and Security Engineers [not-audio_url] [/not-audio_url]

Duration: 40:59
Lars Kamp is Co-Founder & CEO of Fix, the continuous cloud security platform to help detect, prioritize, and remediate critical cloud risks using open source software like their inventory scanner. In this episode, we dis…
E143: Bringing Software Engineering Best Practices to Data [not-audio_url] [/not-audio_url]

Duration: 39:31
Tim Delisle and Nico Joseph are Co-Founders of FiveOneFour, the company attempting to bring a software developer-like experience to data and analytics stacks. Together, they're second-time founders who previously founded…