Context and harness engineering skills : strong experience with the most up to date context and harness engineering best practices like summarization/compression, prompting, prompt caching, subagents, memory, dreaming, context management, tools, async tools, deferred tools, RAG, skills, etc. Yes, we know this industry is evolving rapidly and the "best practices" change every week, but yes, we are still actively looking for someone who has wrestled with these challenges at scale and has strong opinions about what works and what doesn't.