Fiona Fung

When coding stops being the bottleneck, an engineering leader's job becomes verification, ambition, and staying close to what ships.

Fiona Fung runs the Claude Code and Cowork teams at Anthropic. Earlier she worked on TypeScript and Visual Studio at Microsoft, then Facebook Marketplace, then Meta's AR and Instagram orgs.

Her teams now ship far more code per quarter than a few years ago. So the work moved from writing code to deciding what is worth building and keeping confidence in quality high, on a team where PMs and designers also commit.

The operating playbook

• Coding is no longer the bottleneck. "It's lifted the ceiling of what anyone is able to do." The constraint moved to verifying output and deciding what to build.
• Manage through the tool, not around it. She runs a Claude Code session enlisted in all her team's repos, with Slack and metrics access, and does monthly look-back sessions to drive conversations with the team, not just generate PRs.
• Write the routine, not the PR. Async routines read feedback channels overnight, surface themes, and hand her PRs to review by morning. The leader's unit of work moves up to the loop that spawns the agents.
• Hire two profiles. Creative builders with product sense who own a product end to end, and deep systems experts for the parts that need trust but verify.
• High agency is high accountability. Freedom to cook, paired with a clear hypothesis of the problem you are solving. Two sides of the same coin.
• Measure outcomes, not motion. Lines of code and token-maxing measure activity. "Don't forsake motion for progress."
• Bad vs sad. Bad is an irrecoverable error. Sad is recoverable friction. Each team sets its own thresholds, and stacked sads trend toward bad.
• Every manager stays a part-time IC. Player-coach keeps leaders in the product daily and lets them hold the quality bar by dogfooding.
• Just-in-time planning. The six-month roadmap is dead. A lightweight monthly priorities sheet with a weekly check replaces it, plus explicit permission to kill processes that no longer serve the team.
• Make new mistakes. Aiming for zero mistakes means you are being too cautious. Just do not repeat the old ones.

In her words.

"Coding is no longer the bottleneck. It's lifted the ceiling of what anyone is able to do." — Fiona Fung

"With high agency is also high accountability. It's all about making sure folks have that freedom to cook. But then, what's the accountability for it? What's the hypothesis of what you're trying to solve?" — Fiona Fung

Worth knowing

A vendor leader on her own product. The headline productivity numbers are Anthropic's own internal metric and are not externally auditable. Skeptics argue that "more code shipped" measures output, not value, and that AI-heavy teams can accrue review and quality debt. The frameworks stand on their own. Treat the numbers as marketing until independently benchmarked.

Related

• Verification harness — verification is the new scarce skill once coding stops being the bottleneck.
• Manager on tools — manage through the tool; manager as a part-time IC.
• Overnight delegation — async routines that draft PRs overnight; write the routine, not the PR.
• Bad vs sad — her team-owned quality-bar framework.
• Cultivating agency — high agency paired with high accountability.
• Outcomes over output — "don't forsake motion for progress."

Sources

• Building the Most AI-Pilled Engineering Team in the World — Fiona Fung with Lenny Rachitsky, Lenny's Podcast, 21 June 2026. youtube.com/watch?v=Ybrl4FYM57c