Hi I am Risheekkumar, Senior Data Scientist @ Amex

I work on recommender systems and NLP — sequence modeling and LLMs — building AI-powered experiences at scale at American Express. I write about AI-powered product, engineering, and evals. Outside of work, I like playing chess.

Open Source

  • llm-rsa — Recursive Self-Aggregation: iteratively sample and synthesize multiple LLM candidate answers into a stronger final response.

Blog

Programmatic Prompt Optimization: Replacing Intuition with Algorithms

code
research paper
impact

From manual trial-and-error to a systematic framework for scaling reliable Enterprise AI.

Dec 31, 2025
Risheek kumar B

GEPA Deepdive

code
research paper
analysis
reimplementation

An indepth hands-on explanation with code about GEPA - its core and motivations

Dec 21, 2025
Risheek kumar B

Building a Bitcoin Blockchain from Scratch in Python

code
research paper
impact

This post is a simple code implementation of the research paper ‘Bitcoin: A Peer-to-Peer Electronic Cash System’ by Satoshi Nakamoto.

Sep 28, 2025
Risheek kumar B

HNSW: Hierarchical Navigable Small World Graphs for Efficient Similarity Search

code
research paper
impact

This post is a simple code implementation of the research paper ‘Hierarchical Navigable Small World Graphs for Efficient Similarity Search’ by Yury Malkov and D. A. Yashunin.

Aug 14, 2025
Risheek kumar B

Learning from Karpathy’s Micrograd

code
research paper
impact

This post is a simple code implementation of Andrej Karpathy’s Micrograd.

Jun 23, 2025
Risheek kumar B

Naive Bayes Classifier: A Simple Implementation

code
research paper
impact

This post is a simple code implementation of the research paper ‘Naive Bayes Classifier for Efficient Text Classification’ by Peter Norvig.

Nov 5, 2024
Risheek kumar B

KNN: Understanding the K-Nearest Neighbors Algorithm

code
research paper
impact

This post is a simple code implementation of the research paper ‘K-Nearest Neighbors for Efficient Similarity Search’ by Cover and Hart.

Mar 15, 2024
Risheek kumar B
No matching items