Sports player stock market, a mobile app: Trade player as stocks based on their performance, using virtual coins

Sports short-video app

Football livestream app for the world cup

Ethereum blockchain (Solidity, smart contracts)

Bitcoin price tracker and prediction

E-commerce intelligence utility using big data

Trucking transportation management system

Real Dev: Website for developers to practice real world coding skills

Work with core language team on language features

Develop the compiler, mostly the codegen part, in OCaml

Rewrite core piece of Facebook's codebase into the new language to validate viability

Support product teams for feature launches and oncall for multiple years

Performance optimization for backend: Improved IG's server side efficiency at least for 50%. This involves multiple areas, including CPU and memory profiling, hot code optimization, and so on. One example: https://instagram-engineering.com/dismissing-python-garbage-collection-at-instagram-4dca40b29172

Optimize the deployment pipeline for both IG's backend and web. This includes build pipeline, continuous delivery and deployment, canary (testing on small numbers of machines before going wide). Frontend part includes working on webpack packing, linting, assets deployment and serving.

Given a talk about how to achieve true hot reload deployment with Python on PyCon AU 2017

GateLogic: Flexible feature flags for Instagram's backend. The project involves both backend (designing a DSL) and a React frontend (https://instagram-engineering.com/flexible-feature-control-at-instagram-a7d3417658df)