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Offload CPU-intensive tasks to background isolates while keeping Flutter UIs responsive. \n \n Provides three concurrency patterns: async / await for I/O-bound work, Isolate.run() for one-off heavy computations, and Isolate.spawn() with message passing for persistent background workers \n Includes a decision matrix to choose between async operations and isolates based on task type (I/O vs. CPU-bound) and execution frequency \n Covers three complete workflows with step-by-step task checklists: st

Structured input validation, exception design, and graceful failure handling for Python applications. \n \n Covers fail-fast validation patterns, meaningful exception hierarchies, and partial failure handling for batch operations \n Includes Pydantic integration for complex input validation with automatic error messages and custom exception types with context \n Demonstrates exception chaining to preserve debug trails, batch processing with per-item error tracking, and progress reporting for lon

HTTP requests and JSON serialization for Flutter REST API integration and data parsing. \n \n Covers three HTTP methods (GET, POST, PUT, DELETE) with proper status code validation, HTTPS enforcement, and safe URI construction using Uri.https() . \n Offers two serialization strategies: manual fromJson / toJson for simple models, and code generation with json_serializable for complex nested structures. \n Includes background parsing with compute() to prevent UI jank when processing large JSON payl

Working effectively with JSON data structures.

Implement idempotency to ensure operations produce the same result regardless of how many times they're executed.

$22

Layer 1: Language Mechanics

Build secure and robust file upload systems with validation, sanitization, virus scanning, efficient storage management, CDN integration, and proper file serving mechanisms across different backend frameworks.

Build robust error handling systems with standardized error responses, detailed logging, error categorization, and user-friendly error messages. This skill covers the full lifecycle from throwing typed errors through logging, monitoring, and client-facing response formatting.

$22