Vibe Testing vs Vibe Coding: How AI is Breaking Product Development

Steven Lamb, Product Leader at Addepar, reveals the hidden tension in modern product development: we can build 10x faster with AI, but user testing is still stuck in the past. In this episode of UX Stories, we explore how wealth tech companies balance rapid innovation with zero margin for error when managing trillions of dollars. Key Topics: • Why "vibe coding" is outpacing traditional user testing methods • The reality of B2B user testing: 3-day turnarounds vs 24-hour expectations • Synthetic user personas and AI-powered usability testing experiments • When to use deterministic systems vs AI in financial products • The critical difference between user feedback and usability testing • How Instagram shipped twice daily with rapid testing (and why that's rare today) Timestamps: 0:00 - Introduction: The speed problem in product development 3:15 - Balancing AI innovation with financial accuracy at Addepar 8:42 - Why traditional user testing is too slow for modern development 15:30 - Synthetic personas and "vibe usability testing" 22:18 - The B2B user testing challenge: context vs speed 28:45 - Steven's vision for 100% tested products by 2026 Steven Lamb leads product innovation at Addepar, a platform tracking trillions in assets for sophisticated investors. He shares hard-won lessons about maintaining trust while innovating at AI speed. Resources: • Visit TheySaid.io to start vibe testing your products • Connect with Steven Lamb on LinkedIn ProductManagement #UserTesting #AIProduct #B2BSaaS #WealthTech #UXResearch #ProductDevelopment