Haji Rufai

Haji Rufai

Jun 11

I Built an LSM-Tree in Pure Python and Finally Understood How RocksDB and Cassandra Handle Millions of Writes

#python #database #programming #datascience

6 min read

Haji Rufai

Jun 10

I built a feature store in pure Python to finally understand the point-in-time join

#python #machinelearning #dataengineering #mlops

6 min read

Haji Rufai

Jun 9

I Built a Bloom Filter from Scratch in Pure Python and Finally Understood How Databases Skip Reading Data

#python #dataengineering #database #programming

6 min read

Haji Rufai

Jun 8

I Built a Write-Ahead Log in Pure Python and Finally Understood How Databases Survive Crashes

#python #database #dataengineering #programming

7 min read

Haji Rufai

Jun 8

I Built a Columnar File Format in Pure Python — a tiny, readable Parquet

#python #dataengineering #database #programming

6 min read

Haji Rufai

Jun 7

I built a mini columnar storage engine in pure Python — and finally understood why Parquet is so fast

#dataengineering #python #database #performance

6 min read

Haji Rufai

Jun 6

I built a data-contract validator in pure Python (no pandas, no PyYAML) and it caught a 30% revenue ghost

#python #dataengineering #datascience #opensource

6 min read

Haji Rufai

Jun 4

I Built a Cache Engine from Scratch in Python — and O(1) LFU Eviction Is Sneakier Than LRU

#python #datastructures #backend #programming

7 min read

Haji Rufai

Jun 1

I built a task scheduler with cron parsing from scratch in Python — zero dependencies

#python #devops #programming #opensource

4 min read

Haji Rufai

Jun 1

I Implemented AES-128 from Scratch and Built a Secrets Vault in Python

#python #security #cryptography #opensource

5 min read

Haji Rufai

May 31

I Built a Stream Processing Engine from Scratch in Python — Here's How Windowing Actually Works

#python #dataengineering #streaming #tutorial

4 min read

Haji Rufai

May 31

I Built an API Gateway from Scratch in Python — Zero Dependencies

#python #backend #api #tutorial

4 min read

Haji Rufai

May 30

I Built a Message Broker from Scratch in Python (Zero Dependencies)

#python #kafka #messaging #distributedsystems

3 min read

Haji Rufai

May 30

I Built a Distributed Tracing System from Scratch in Python

#python #observability #distributedsystems #backend

6 min read

Haji Rufai

May 29

Building a Full-Text Search Engine from Scratch in Python

#python #searchengine #algorithms #tutorial

4 min read

Haji Rufai

May 29

Building an HTTP Server Framework from Raw TCP Sockets in Python

#python #networking #http #webdev

5 min read

Haji Rufai

May 28

Building a Programming Language Interpreter From Scratch in Python

#python #compiler #programming #tutorial

5 min read

Haji Rufai

May 28

Building a Distributed Key-Value Store with Raft Consensus in Python

#python #distributedsystems #backend #tutorial

4 min read

Haji Rufai

May 27

Building a SQL Query Engine from Scratch in Python: Lexer Parser Optimizer Executor

#python #database #tutorial #opensource

5 min read

Haji Rufai

May 27

Building a DAG Workflow Orchestration Engine from Scratch in Python

#python #dataengineering #tutorial #opensource

5 min read

Haji Rufai

May 26

Building a Vector Search Engine from Scratch in Python (Flat, IVF, HNSW)

#python #machinelearning #database #algorithms

6 min read

Haji Rufai

May 26

Building an Intelligent CI/CD Pipeline Generator in Python

#python #devops #cicd #github

5 min read

Haji Rufai

May 25

Building a Kenya Economic Intelligence Dashboard with Python, Plotly & World Bank Data

#python #datascience #plotly #analytics

5 min read

Haji Rufai

May 25

Building a Data Drift Detection Framework in Python with Statistical Rigor

#python #datascience #machinelearning #devops

1

4 min read

Haji Rufai

May 24

Building a Smart Job Application Tracker with FastAPI, TF-IDF Matching, and Analytics

#python #webdev #career #machinelearning

4 min read

Haji Rufai

May 24

Building a RAG Document Q&A System with Hybrid Retrieval (No Embeddings API Needed)

#ai #python #machinelearning #rag

6 min read

Haji Rufai

May 23

Building an African Economic Data Pipeline with Python, DuckDB & World Bank API

#dataengineering #python #sql #tutorial

4 min read

Google I/O Writing Challenge Submission

Haji Rufai

May 23

Forget Gemini Spark — The Managed Agents API Is the Real Game-Changer from Google I/O 2026

#devchallenge #googleiochallenge #ai #agents

5

6 min read

Haji Rufai

May 22

Red-Teaming Your LLM Applications: A Practical Guide to Building Guardrails That Actually Work

#ai #safety #python #machinelearning

1

8 min read

Haji Rufai

May 21

Building Production-Ready RAG Systems: Lessons from the Trenches

#ai #machinelearning #python #dataengineering

3

3 min read

DEV Community

Badges

Writing Debut

I Built an LSM-Tree in Pure Python and Finally Understood How RocksDB and Cassandra Handle Millions of Writes

I built a feature store in pure Python to finally understand the point-in-time join

I Built a Bloom Filter from Scratch in Pure Python and Finally Understood How Databases Skip Reading Data

I Built a Write-Ahead Log in Pure Python and Finally Understood How Databases Survive Crashes

I Built a Columnar File Format in Pure Python — a tiny, readable Parquet

I built a mini columnar storage engine in pure Python — and finally understood why Parquet is so fast

I built a data-contract validator in pure Python (no pandas, no PyYAML) and it caught a 30% revenue ghost

I Built a Cache Engine from Scratch in Python — and O(1) LFU Eviction Is Sneakier Than LRU

I built a task scheduler with cron parsing from scratch in Python — zero dependencies

I Implemented AES-128 from Scratch and Built a Secrets Vault in Python

I Built a Stream Processing Engine from Scratch in Python — Here's How Windowing Actually Works

I Built an API Gateway from Scratch in Python — Zero Dependencies

I Built a Message Broker from Scratch in Python (Zero Dependencies)

I Built a Distributed Tracing System from Scratch in Python

Building a Full-Text Search Engine from Scratch in Python

Building an HTTP Server Framework from Raw TCP Sockets in Python

Building a Programming Language Interpreter From Scratch in Python

Building a Distributed Key-Value Store with Raft Consensus in Python

Building a SQL Query Engine from Scratch in Python: Lexer Parser Optimizer Executor

Building a DAG Workflow Orchestration Engine from Scratch in Python

Building a Vector Search Engine from Scratch in Python (Flat, IVF, HNSW)

Building an Intelligent CI/CD Pipeline Generator in Python

Building a Kenya Economic Intelligence Dashboard with Python, Plotly & World Bank Data

Building a Data Drift Detection Framework in Python with Statistical Rigor

Building a Smart Job Application Tracker with FastAPI, TF-IDF Matching, and Analytics

Building a RAG Document Q&A System with Hybrid Retrieval (No Embeddings API Needed)

Building an African Economic Data Pipeline with Python, DuckDB & World Bank API

Forget Gemini Spark — The Managed Agents API Is the Real Game-Changer from Google I/O 2026

Red-Teaming Your LLM Applications: A Practical Guide to Building Guardrails That Actually Work

Building Production-Ready RAG Systems: Lessons from the Trenches