Developer Conference Tee-shirts

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This customer received 121 t-shirt designs from 34 designers. They chose this t-shirt design from STierney as the winning design.
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T-shirt Design Brief
We are after a design for conference shirts. The shirts should represent the topic of this conference: IT, particularly Developers/Programmers, and this conference target specifically Functional Programmers.
The name of the conference is "YOW! Lambda Jam". The reason for its name is because 'Lambda' is a symbol that is the base of the Functional Programming; and 'Jam' are little workshops held during the conference.
The shirts will be for the attendees of the conference. They are a majority of men, between 25 and 40 years old.
Target Market(s)
Developers/Programmers - Specifically Functional Programmers
Industry/Entity Type
Information Technology
Look and feel
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Professional
Feminine
Masculine
Colorful
Conservative
Economical
Upmarket
Requirements
Nice to have
- - It would be nice if we could incorporate the Lambda symbol as it is the base of most work for Functional Programmers.
- - We could possibly have the name of the conference " YOW! Lambda Jam"
- - We could possibly have the year "2017".