DroidKaigi is the biggest Android-Enginner conference in Japan. 
Design Process
1. Defined the values
We started with defining their values. We asked what they think important in their activity. The values became Fairness and Freedom.
2. Made a mood board
To share the vision of each value with members of the design team, we made a mood board.
3. Made patterns by each designers
To expand the patterns, we made patterns by each designer. 
My pattern was chosen by the DroidKaigi team.
4. Finalisation
After the selection of the base pattern, we finished all the symbol, logotype, and the colour.