Cross-functional leadership is driving outcomes with partners you don't manage by building shared goals and trust. With product, design, data, and others, influence comes from alignment and reliability, not authority.
How to work with key partners
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PRODUCT → align on the WHY and priorities; engineering owns the HOW and feasibility
DESIGN → involve early; respect craft; trade off polish vs. timelines together
DATA/QA/SEC → bring them in upstream, not as a gate at the end
ALL → one shared goal, clear ownership (RACI), and honest status
