Flutter & Dart: Expert-level proficiency in Flutter for cross-platform UI development and native platform channel integration., Local Model Expertise: Hands-on experience with on-device Small Language Models (SLMs) and audio/visual models like Whisper and PaddleOCR., Applied Cryptography: Strong understanding of E2EE boundaries, HKDF key derivation, and hardware-backed key management (Secure Enclave/TPM)., Data Structures: Experience with CRDTs or Merkle trees for multi-device shard catalog reconciliation and sync., Performance Optimization: Ability to manage background compute tasks (indexing during idle/charging) and optimize local RAG (Retrieval-Augmented Generation) loops., Very good knowledge of English.