Eleanor Millman and Mina Tawadrous from SiriusXM share how their team built a custom, AI-assisted prioritization system centered on developer speed, reliability, cost, and trust.

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SiriusXM's Eleanor Millman and Mina Tawadrous describe how their platform engineering team moved beyond the RICE framework to build a custom, weighted prioritization system. The system decomposes 'impact' into dimensions like developer speed, reliability, cost, security, and trust. A key innovation is 'assumptions as code' — storing team assumptions in a central repository so they can be versioned, reused, and validated with AI assistance, reducing hidden misalignment across teams. The approach forces explicit tradeoffs, surfaces disagreements early, and is shaping SiriusXM's 2026 platform strategy.

Assumptions as code: SiriusXM’s approach to platform prioritization