Hey,
I am already a salesforce developer in a company based in Poland. Since I know this platform, I have decided to write my engineering work/bachelors of science about salesforce and create an app on it. Therefore I need a developer enviroment for about 6-12 months that will not expire. All the free ones are for one month freely only. Have You got guys any sugestions what I could do? I already wrote about 4-5 times question/ to suport asking the same question again and again, and each one is telling me to write to someone else.
Regards,

Mateusz WK