Onboarding Guide

Non-Technical

Greenfield vs Brownfield
- Greenfield software is the software that we design and develop from scratch. Brownfield software is one where something already exists and we have to add functionality and/or features to it.
- Obvious mostly works in greenfield software development but we occasionally work with brownfield stuff too.

Trunk Based Development (TBD)
- Use of feature flags for features that span over multiple PRs
- Habit of raising PRs everyday
- Prioritising review over writing new code (dropping everything to review a PR)
- Show the Simple repo for daily branches, continuous integration and Github Actions for having checks in place
Code Reviews & Pull Requests
- Read the Google code review guide and highlight some important practices that we follow as a team
Estimation Practices
- How engineers get estimations wrong?
- Estimation based on complexity and not time
Testing
- Testing pyramid
  - Unit and Integration testing
  - Importance of testing
- Covariance and contra-variance in tests
- Testing codelabs for beginners:
  - Testing basics
  - Test doubles and dependency injection
- Test doubles: Fakes, mocks and Stubs

Functional Core and Imperative Shell
- Pure functions
- Imperative and functional programming basics
- Boundaries Talk by Gary Bernhardt - YouTube / Original Website
  - Usage of Functional Core & Imperative Shell in above talk - Video Link
Introduction to State Machines
Introduction to Mobius
- Mobius onboarding
  - Pairing activity using Counter example
  - Test-driven development
  - Introduce the login example
  - Pair on drawing the state diagram for login screen
  - Introduce Effect and EffectHandler
  - Introduce to Views and View Renderers
  - Introduce Init and wire Mobius loop
- Individual Activity: Re-write the take-home exercise in Mobius