Summary
Jennings joined Block 12 years ago on the Square business team and moved to Cash App in 2016 when it was 25 people doing peer-to-peer payments. He describes how Cash App's differentiation was instant bank-to-bank transfers on debit rails (via Visa Direct), which gave them product-market fit that competitors like Venmo lacked. The company functionalized ~18-20 months ago, consolidating product, engineering, and design across all brands under Jennings to enable more flexible resource allocation.
On AI: Jennings says Block has been early — they launched Goose, an open-source agent harness (the first of its kind per his account), and worked with Anthropic and OpenAI on MCP. But in the last week of November / first week of December 2025, the arrival of Opus 4.6 and Codex 5.3 crossed a threshold where agentic systems could autonomously write production-quality code. The org change — which overindexed reductions in product, design, and engineering — followed directly. Block now uses small squads of 2-3 full-stack engineers running tools like BuilderBot (a Slack-integrated agent built on Goose) and G2 (an agentic operating system with MCPs into Snowflake, Tableau, Gmail, Calendar, and other tools). Customer support automation is at 75-80% of chat inquiries handled without human intervention, with no degradation in CSAT. Jennings emphasizes a risk spectrum: internal tools and prototypes are high-risk-tolerance, while financial platform infrastructure (reconciliation, treasury, card issuance) remains heavily human-reviewed.