To manage an infinite stream of feature requests for their horizontal product, Missive's founders relied on a simple filter: "Would I use that myself?" This strict dogfooding approach allowed the bootstrapped team to stay focused, avoid feature bloat, and build a product they genuinely loved using.

Salesforce operates under a 'Customer Zero' philosophy, requiring its own global operations to run on new software before public release. This internal 'dogfooding' forces them to solve real-world enterprise challenges, ensuring their AI and data products are robust, scalable, and effective before reaching customers.

The vision for Codex extends beyond a simple coding assistant. It's conceptualized as a "software engineering teammate" that participates in the entire lifecycle—from ideation and planning to validation and maintenance. This framing elevates the product from a utility to a collaborative partner.

To ensure product quality, Fixer pitted its AI against 10 of its own human executive assistants on the same tasks. They refused to launch features until the AI could consistently outperform the humans on accuracy, using their service business as a direct training and validation engine.

OpenAI is forcing a radical internal shift in its software development process. President Greg Brockman has set a deadline for engineers to use AI agents as their primary tool, replacing traditional editors and terminals. This extreme "dogfooding" signals that agent-driven development is an immediate operational reality, not a future concept.

Dogfooding isn't enough. Founders should use every feature of their product weekly to develop a subjective feel for quality. Combine this with objective metrics like the percentage of unhappy customers and the engineering velocity for adding new features.

Teams that claim to build AI on "vibes," like the Claude Code team, aren't ignoring evaluation. Their intense, expert-led dogfooding is a form of manual error analysis. Furthermore, their products are built on foundational models that have already undergone rigorous automated evaluations. The two approaches are part of the same quality spectrum, not opposites.

According to CTO Malte Ubl, Vercel's core principle is rigorous dogfooding. Unlike "ivory tower" framework builders, Vercel ensures its abstractions are practical and robust by first building its own products (like V0) with them, creating a constant, reality-grounded feedback loop.

To maintain quality while iterating quickly, Vercel builds its own applications (like V0) on its core platform, becoming "customer zero." This internal usage forces them to solve real-world security, performance, and user experience problems, ensuring the underlying infrastructure is robust for external customers.