Ottilie Williams
● Full-stack engineer
Newcastle, NSW
Engineering
with intent.
Full-stack software engineer specialising in Ruby on Rails, TypeScript & React — building data-intensive, audit-grade platforms in emissions and fintech.
01
Decide
02
Commit
03
Ship
01
What I work with.
↘
— Languages
Ruby
TypeScript
JavaScript
Rust
— Backend
Ruby on Rails
REST APIs
— Frontend
React
RTK Query
HTML
CSS
Storybook
— Testing
Cypress
RSpec
Rust testing
Snapshot testing
— Data & Cloud
PostgreSQL
Docker
AWS
— Tools
Git
Buildkite
Trello
Notion
Claude Code
02
Where I've built things.
↘Feb 2023 —
Feb 2026
Feb 2026
KinesisFull-Stack Software Engineer
Shipped React & TypeScript features on a platform for tracking large-scale emissions data. Improved data quality in a Rust pipeline with validation and cross-checks, and rolled out reusable frontend patterns across the product.
React · TypeScript · Rust · Cypress · Buildkite
Aug 2021 —
Nov 2022
Nov 2022
360 InsightsFull-Stack Rails Developer
Built features on an enterprise employee-incentive SaaS. Designed APIs, refactored Sidekiq jobs, and resolved N+1s to cut page-load times by ~50%.
Rails · Postgres · Sidekiq · RSpec · AWS
Mar 2019 —
Jul 2021
Jul 2021
BT GroupFull-Stack Rails Developer
Internal inventory and workflow application for network engineers. Practised TDD with RSpec & Cucumber in a large multi-team environment; led Brown Bag knowledge-sharing sessions.
Rails · Postgres · JavaScript · RSpec · Cucumber
Nov 2018 —
Feb 2019
Feb 2019
BT FurtHERTrainee · Digital Intensive
Training programme in Python, APIs and test-driven development. Built and deployed a small application in a collaborative environment.
Python · APIs · TDD
Personal Projects
PommieSuper — a cross-border calculator for UK nationals in Australia.
Modelling superannuation contribution scenarios and tax-treaty implications with Rails, React and TypeScript. A focus on clarity of the financial modelling.