Dynamic DAGs in Airflow: Patterns and Best Practices
Master dynamic DAG generation in Airflow using DAG factories, dynamic task mapping, YAML configs, expand/reduce, and avoid common pitfalls.
·9 min read · #airflow#dynamic-dags#task-mapping
Blog
1745 posts · page 1 of 37
Building Custom Operators in Apache Airflow
Learn to build custom Airflow operators from scratch with BaseOperator, hooks, templated fields, testing strategies, and packaging for reuse.
·8 min read · #airflow#custom-operators#hooks
Data Orchestration with Dagster
Learn Dagster's software-defined assets, ops, jobs, schedules, and sensors. Includes a practical comparison with Apache Airflow.
·6 min read · #data-engineering#dagster#orchestration
Data Partitioning Strategies for Scale
Master hash, range, and list partitioning strategies. Learn to choose partition keys, avoid hot partitions, and scale your data systems.
·7 min read · #data-engineering#partitioning#performance
Apache Iceberg: The Modern Table Format
Understand Apache Iceberg's architecture, schema evolution, time travel, and hidden partitioning. Learn why table formats matter for data lakes.
·8 min read · #data-engineering#iceberg#data-lakehouse
Real-Time Data Streaming: Architectures and Patterns
Learn real-time streaming architectures like Lambda, Kappa, CDC, and event sourcing. Understand when to choose streaming over batch processing.
·7 min read · #data-engineering#streaming#kafka
Chunking Strategies for RAG: A Complete Guide
Learn fixed-size, semantic, recursive, and document-aware chunking strategies for RAG pipelines. Includes overlap techniques, benchmarks, and Python code.
·7 min read · #embeddings-rag#chunking#retrieval
Embedding Models Compared: OpenAI, Cohere, and Open-Source
Compare text-embedding-3-small/large, Cohere embed-v3, and sentence-transformers on dimensions, cost, MTEB scores, and practical RAG performance.
·7 min read · #embeddings-rag#openai#cohere
Hybrid Search for RAG: Combining Dense and Sparse Retrieval
Learn how to combine BM25 keyword search with vector similarity using reciprocal rank fusion for better RAG retrieval. Includes Python code and benchmarks.
·8 min read · #embeddings-rag#hybrid-search#bm25
RAG Evaluation Metrics: Measuring Retrieval and Generation Quality
Learn to evaluate RAG pipelines with Recall@k, MRR, NDCG for retrieval and faithfulness, relevance, hallucination rate for generation. Includes RAGAS setup.
·10 min read · #embeddings-rag#evaluation#ragas
Dead Letter Queues in Kafka: Handling Failed Messages
Learn how to implement Dead Letter Queues in Kafka to gracefully handle failed messages with retry strategies, monitoring, and production patterns.
·9 min read · #kafka#dead-letter-queue#error-handling
Kafka Multi-Cluster Replication with MirrorMaker 2
Master Kafka multi-cluster replication using MirrorMaker 2 with active-passive and active-active topologies, offset sync, and disaster recovery.
·9 min read · #kafka#mirrormaker#replication
LeetCode Interval Problems: Merge, Insert, and Schedule
Master interval problems on LeetCode: sorting, merging, inserting, and scheduling with templates, visual walkthroughs, and complexity analysis.
·6 min read · #leetcode#intervals#algorithms
LeetCode Two Pointer Patterns: The Complete Guide
Master every two pointer pattern for LeetCode: opposite-end, same-direction, and fast/slow pointers with templates, complexity analysis, and 15+ mapped problems.
·7 min read · #leetcode#two-pointers#algorithms
Dotfiles Management: Sync Your Dev Setup Across Machines
Learn to manage dotfiles with GNU Stow, chezmoi, or a bare git repo. Bootstrap any new machine in minutes with your exact config.
·6 min read · #productivity#dotfiles#devtools
Debugging Strategies Every Developer Should Know
Master binary search debugging, rubber duck method, git bisect, stack traces, logging levels, and when to use print statements vs a debugger.
·8 min read · #productivity#debugging#devtools
10 Terminal Tools That Will 10x Your Productivity
Discover fzf, ripgrep, zoxide, bat, and more CLI tools that replace slow workflows with instant results. Install commands and config included.
·5 min read · #productivity#terminal#cli
Git Workflow Strategies for Teams
Compare Gitflow, trunk-based, GitHub Flow, and Ship/Show/Ask. Learn which git workflow fits your team, with branch naming and PR conventions.
·7 min read · #productivity#git#teamwork
Pandas Performance Optimization: From Slow to Fast
Speed up Pandas code with vectorization, categorical dtypes, chunked reading, eval/query, PyArrow backend, and memory profiling techniques.
·6 min read · #pandas#python#performance
Pandas Window Functions: Rolling, Expanding, and EWM
Master Pandas window functions: rolling averages, expanding cumulative stats, exponential weighting, groupby + rolling, and custom window operations.
·5 min read · #pandas#python#window-functions
Deque Design Patterns — Sliding Window, Palindrome, Work Stealing
Master deque design patterns including sliding window maximum, palindrome checking, work stealing, and BFS/DFS hybrid. Python implementations.
·7 min read · #dsa#queues#deque
Priority Queue Patterns — Top-K, Merge K Lists, Median, Dijkstra
Master priority queue patterns for coding interviews. Top-K elements, merge K sorted lists, running median, and Dijkstra's algorithm in Python.
·7 min read · #dsa#heaps#priority-queue
BFS Pattern with Queues: Level-Order and Shortest Path
Master BFS using queues for tree level-order traversal and shortest path in unweighted graphs. Python implementations with detailed traces.
·3 min read · #dsa#queues#intermediate
Design Circular Deque — Array-Based Implementation (LeetCode 641)
Design a Circular Deque with front/rear pointers on a fixed-size array. Python solution with all O(1) operations, visual trace, and edge case handling.
·6 min read · #dsa#queues#design
Design Front Middle Back Queue — Two Deques (LeetCode 1670)
Design Front Middle Back Queue using two balanced deques. Python solution with O(1) operations, step-by-step trace, and complexity analysis for LeetCode 1670.
·6 min read · #dsa#queues#design
Design Hit Counter Using Queue
Design a hit counter that counts hits in the past 5 minutes using a queue. LeetCode 362 solution with O(1) amortized operations.
·3 min read · #dsa#queues#intermediate
First Non-Repeating Character in a Stream
Find the first non-repeating character in a character stream using a queue and hash map. Python solution with O(1) amortized per query.
·3 min read · #dsa#queues#intermediate
Implement Stack Using Two Queues — Two Approaches Explained
Implement a stack using two queues with costly push and costly pop approaches. Complete Python solutions with complexity analysis.
·4 min read · #dsa#stacks#queues
Moving Average from Data Stream Using Queue
Calculate the moving average from a data stream using a queue with fixed window size. LeetCode 346 solution with O(1) per operation.
·2 min read · #dsa#queues#beginner
Jump Game III and IV — BFS with Queue
Solve Jump Game III (LeetCode 1306) and Jump Game IV (LeetCode 1345) using BFS. Covers graph modeling of array problems with queue-based traversal.
·4 min read · #dsa#queues#intermediate
Number of Recent Calls — Queue-Based Sliding Window (LeetCode 933)
Solve Number of Recent Calls using a queue as a 3000ms sliding window counter. Python solution with deque, step-by-step trace, and amortized analysis.
·6 min read · #dsa#queues#easy
Rotten Oranges — Multi-Source BFS with Queue
Solve the Rotten Oranges problem (LeetCode 994) using multi-source BFS. Covers the simultaneous spread pattern, Python code, and grid BFS template.
·4 min read · #dsa#queues#intermediate
Open the Lock — BFS on State Space (LeetCode 752)
Open the Lock problem solved with BFS on 4-digit state space. Python solution with deadend handling, bidirectional BFS optimization, and complexity analysis.
·6 min read · #dsa#queues#bfs
Shortest Path in Binary Matrix — BFS Solution
Find the shortest path in a binary matrix using BFS with 8-directional movement. LeetCode 1091 solution with Python code and grid traversal tips.
·3 min read · #dsa#queues#intermediate
Sliding Window Maximum Using Deque
Solve the sliding window maximum problem in O(n) using a monotonic deque. Covers the algorithm, Python code, visual traces, and variations.
·4 min read · #dsa#queues#advanced
Shortest Subarray with Sum at Least K — Monotonic Deque (LeetCode 862)
Shortest Subarray with Sum at Least K solved with monotonic deque and prefix sums. Python solution with detailed trace, complexity analysis, and edge cases.
·7 min read · #dsa#queues#deque
Task Scheduler — Queue + Heap Approach
Solve the Task Scheduler problem (LeetCode 621) using a queue and max-heap. Covers the greedy formula and simulation approaches with Python code.
·3 min read · #dsa#queues#advanced
Walls and Gates — Multi-Source BFS
Fill each empty room with the distance to its nearest gate using multi-source BFS. LeetCode 286 solution with Python code and grid BFS template.
·3 min read · #dsa#queues#intermediate
Snakes and Ladders BFS — Shortest Path on Game Board (LeetCode 909)
Solve Snakes and Ladders with BFS to find minimum dice rolls. Python solution with 1D-2D conversion, boustrophedon layout, and step-by-step trace.
·7 min read · #dsa#queues#bfs
Zigzag Level Order Traversal — BFS with Deque in Python
Zigzag level order traversal of a binary tree using BFS and deque. Step-by-step Python solution with visual trace, complexity analysis, and interview tips.
·5 min read · #dsa#queues#trees
Word Ladder BFS Approach — Shortest Transformation Sequence
Word Ladder solved with BFS and pattern matching optimization. Step-by-step Python solution for LeetCode 127 with complexity analysis and interview tips.
·6 min read · #dsa#queues#bfs
132 Pattern — Monotonic Stack with Reverse Traversal (LeetCode 456)
Solve the 132 Pattern problem using a monotonic stack scanning right to left. Python solution tracking s3 candidates and s2 maximum, with detailed trace.
·7 min read · #dsa#stacks#advanced
Asteroid Collision Problem Using Stacks
Solve the asteroid collision problem (LeetCode 735) using a stack. Covers collision rules, Python implementation, and all edge cases.
·3 min read · #dsa#stacks#intermediate
Basic Calculator I, II, III — Complete Expression Evaluation Guide
Solve Basic Calculator problems LeetCode 224, 227, and 772. Master stack-based expression evaluation with +, -, *, /, and parentheses in Python.
·6 min read · #dsa#stacks#advanced
Car Fleet Problem — Stack-Based Arrival Time Solution
Solve LeetCode 853 Car Fleet using a stack. Sort by position, compare arrival times, and count fleets. Python solution with visual trace.
·5 min read · #dsa#stacks#sorting
The Celebrity Problem Using Stack-Based Elimination
Solve the celebrity problem in O(n) time using a stack elimination technique. Includes proof of correctness, Python code, and matrix examples.
·4 min read · #dsa#stacks#intermediate
Decode String (LeetCode 394) — Nested Bracket Decoding
Decode nested encoded strings like '3[a2[c]]' using a stack. Complete walkthrough with Python solution, traces, and edge cases.
·3 min read · #dsa#stacks#intermediate
Evaluate Reverse Polish Notation — Stack Solution Explained
Solve LeetCode 150 Evaluate Reverse Polish Notation using a stack. Python implementation with division gotcha, traces, and complexity analysis.
·5 min read · #dsa#stacks#intermediate