# Portfolio

Things I've Built

Personal projects — to learn, experiment, and scratch my own intellectual itches.

~/projects/cross-encoder-&-reranking

Cross-Encoder & Reranking

A Python package demonstrating progressive cross-encoder reranking techniques — from basic scoring to fine-tuning, knowledge distillation, query caching, and ColBERT late interaction — with adversarial evaluation datasets.

PythonCross-EncodersInformation Retrieval

Code

~/projects/bojiosg

WIP

BojioSG

I built a social sports event app for Singapore — discover, join, and organise paid activities like pickleball, badminton, tennis, and basketball. "Don't say bojio!" — no one gets left out.

React NativeSwiftTypeScriptPython / FastAPIPostgreSQL / Flyway

Code

~/projects/autohyde

AutoHyDE

I created a semi-supervised framework to improve the effectiveness, coverage, and applicability of HyDE for retrieval-augmented generation.

PythonLLMRAG

Code

~/projects/trump-twitter-financial-volatility

Trump Twitter Financial Volatility

A university research project to infer stock market volatility from Trump's tweets using sentiment analysis and time series modelling.

PythonNLPSentiment AnalysisTime Series

Code

~/projects/auto-prompt

Auto Prompt

An early experiment in automated prompt generation with iterative human-in-the-loop feedback — back when prompt engineering was still the wild west.

PythonLLM

Code

~/projects/sudoku-solver

Sudoku Solver

A fun attempt at building a sudoku solver — because why solve puzzles by hand when you can automate it?

Python

Code

Articles I've Written

Advanced RAG Retrieval: Cross-Encoders & Reranking

Towards Data Science · Apr 2026

Clippers, Competition, and the Curious Case of Clustered Barbers

Medium · Feb 2025

AutoHyDE: Making HyDE Better for Advanced LLM RAG

Towards Data Science · Apr 2024

Automated Prompt Engineering

Towards Data Science · Mar 2024

Text-to-SQL LLM Applications: Prompt Injections

Towards Data Science · Feb 2024

Causal Inference: Quasi-Experiments

Towards Data Science · Aug 2023

Introduction to Trend Filtering with Applications in Python

Towards Data Science · Jun 2020

Side Quests

Less serious things I've built for other people, freelance work, side hustles, and other adventures.

AI Companion App

Retired

Spent 1.5 years building an AI girlfriend companion app that got deployed and scaled hard. Evolved into a full agentic experience — fengshui readings, in-app interactive games, the works. Product-side drama led to an acquisition, and I bounced when the space got too crowded.

University Applications Consultancy

Retired

Ran a business helping clients with university applications — started freelancing for others, then launched my own thing. Quickly learned that running and marketing a business alongside a full-time job is a different kind of hard. Shut it down, but the lessons stuck.

Freelance Assignment Help

Retired

Used to get paid to help people with their assignments. Money was decent but not worth the effective hourly rate. Honestly, with AI these days, glad I quit ahead of the curve.