Develop and optimize Solana’s AccountsDB storage engine, including indexing, caching, snapshots, background maintenance, and crash recovery. Improve validator throughput, latency, memory, and disk efficiency while ensuring correctness across forks. Build stress, fault-injection, and performance tests; profile low-level systems; collaborate with protocol teams; and document designs and review code. The role requires strong systems programming, storage architecture, Linux I/O, kernel and memory-management knowledge, concurrency expertise, and performance optimization experience.