Direct experience designing for frontline, field, industrial, or physically-constrained environments (e.g., construction, logistics, manufacturing, healthcare, energy, oil & gas, mining, warehousing) rather than purely office-based SaaS. If you've ever designed a mobile product that had to survive contact with the real world — gloves, glare, noise, motion, bad connectivity, someone glancing at a screen for two seconds mid-task — you understand the challenge ahead.