Prototyping, vibe coding and developer handoff

Alan Byrne, Product Leader for Mozilla’s Firefox extensions ecosystem, argues that the best product work is less doctrine and more judgement. In conversation with LRandy Silver, he breaks down why prioritisation frameworks like RICE and MoSCoW often masquerade as science while quietly embedding subjectivity—and why he prefers writing clear “what and why” statements over chasing false precision.

From his experience at QuickBooks and Twitter, Alan explores when PRDs are genuinely valuable (complex systems, high risk, trust and safety concerns) and how to keep them lean enough to stay useful. The discussion also digs into the tension between moving a metric and doing right by users, the dangers of gamifying growth, and how product managers can translate customer problems into narratives that align engineers, executives, and sales.

Chapters
03:30 Product as philosophy
04:41 Studying product vs learning in the field
07:25 The real job: understand users and their “why”
08:21 Why prioritisation frameworks often fail in practice
10:58 Decision-making without false precision
13:14 Goal-led roadmaps and narrative alignment
14:22 Metrics, ethics, and avoiding gamification traps
18:35 When PRDs help, and how to keep them lean
22:37 Prototyping, vibe coding, and where it falls apart
25:14 Communication, compromise, and working documents
27:36 Preventing overbuild and defining “good enough”
30:39 Handling “can’t you just…” from sales and marketing
33:28 What Alan wishes he knew five years ago
34:49 Explaining product management to non-product people

Our Hosts
Lily Smith enjoys working as a consultant product manager with early-stage and growing startups and as a mentor to other product managers. She’s currently Chief Product Officer at BBC Maestro, and has spent 13 years in the tech industry working with startups in the SaaS and mobile space. She’s worked on a diverse range of products – leading the product teams through discovery, prototyping, testing and delivery. Lily also founded ProductTank Bristol and runs ProductCamp in Bristol and Bath.

Randy Silver is a Leadership & Product Coach and Consultant. He gets teams unstuck, helping you to supercharge your results. Randy's held interim CPO and Leadership roles at scale-ups and SMEs, advised start-ups, and been Head of Product at HSBC and Sainsbury’s. He participated in Silicon Valley Product Group’s Coaching the Coaches forum, and speaks frequently at conferences and events. You can join one of communities he runs for CPOs (CPO Circles), Product Managers (Product In the {A}ether) and Product Coaches. He’s the author of What Do We Do Now? A Product Manager’s Guide to Strategy in the Time of COVID-19. A recovering music journalist and editor, Randy also launched Amazon’s music stores in the US & UK.