Systems

/Systems_

Design patterns, systems thinking, and end-to-end service design -- from data modeling to API endpoints to scalability considerations.

Software Design

• Multi-Dimensional Aggregation -- Feature store rollups without pandas
• Unbiased Random Permutation -- Fisher-Yates for fair sampling in ML pipelines
• Memory Allocation & Fragmentation -- malloc/free patterns behind GPU caching allocators
• Single-Pass Map-Side Aggregation -- Lightweight ETL with dictionary accumulation
• Grid Traversal Strategies -- Greedy, BFS, and DFS compared
• Session Window Feature Engineering -- Sessionization for recommendation and churn models
• Sequential Access Optimization (SCAN) -- Disk scheduling for data loader performance
• Composable Unit Expression Parser -- Recursive parsing for mixed-unit feature engineering

Microservices & APIs

• Hierarchical Tree Flattening -- Tree-building from flat parent pointers
• Adjacency List vs Nested Set Tradeoffs -- Hierarchy storage for cheap reads or cheap writes
• Ingest-Transform-Serve Pipeline -- Scheduled ingestion to REST API
• Queue-Based Stage Decoupling -- High-throughput message processing architecture
• Graph Traversal with Command Pattern -- Separating data graph from traversal strategies
• Fair Allocation with Priority -- Constrained distribution with guaranteed minimums