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Portfolio
Here’s some of the stuff that I’ve done over the years.
Timeshare
Timeshare is a tiny web app that aims to be like Splitwise for on-call hours. There’s nothing super fancy here: it’s a web app built with SvelteKit and PostgreSQL. Mostly, I wanted to see what all of the hype was about with SvelteKit, and build something cool and practical for my colleagues in the process.
Stonks
For my final year University project, I embarked on a mission to scientifically determine whether the collective minds of Twitter could be used to predict the stock market.
While this was something that had been assessed in the literature before, the analyses often focused on a small subset of tweets, machine learning methods, or stock symbols. For my project, I decided to go big and looked at 9 million tweets and 4,612 stock symbols.
This involved large-scale data collection, aggregation, and preparation; feature engineering, selection, and scaling; and the application and tuning of several machine learning and statistical models, including neural network-based (CNNs, RNNs), ensemble (random forests), and conventional (ARIMA, exponential smoothing) models.
If this sounds vaguely interesting, the paper is available here.
Advent of Code
Okay, this isn’t really a portfolio item, but I couldn’t resist mentioning it because it was so much fun.
In recent years, I got bored of doing the Advent of Code in so-called ‘sensible’ languages. So, in 2022, I decided to do it in Google Sheets — without macros or anything fancier than a few formulas. I had to stop on day 7, by which point I had started writing a compiler that would generate an Excel spreadsheet from a sort of pseudocode, when I realised that it had been a while since I’d been outside.
In 2023, I tried to use Terraform. It may surprise you to know that this actually wasn’t much easier than Google Sheets, and I unfortunately only made it as far as day 5 before my free time started to be eroded.
In 2024, I ran out of ideas decided to take a break. Watch this space to see what I’ll cook up for 2025.
LetMePass
LetMePass is a password manager for Android, developed as part of my A-Level computer science coursework. The app features strong cryptography (AES-256 w/ GCM, Argon2), Google Drive cloud-sync, and password breach checking. It is also fully free and open source.
DefianceCraft
DefianceCraft was an award-winning Minecraft server that I operated with a colleague from 2011-2017. I developed an array of bespoke software to run on the server and provide unique features to players, boosting server popularity and revenue, and distinguishing DefianceCraft from the competition.
To support the hundreds of thousands of unique players, I developed server-side software in Java; websites, using a variety of technologies; and administered our MongoDB database and server fleet. I also dabbled in protocol analysis (to support new game features before official APIs became available).
Some of the project’s more recent codebase can be viewed on Github.