I liked the 'data analysis' part, and 'buidling your own trading software part'. However the work environment was very toxic for me, and it ended in a minor burnout. Now I work as a kind of Product Owner in a startup where I highly respect my boss, and I am super happy about it!
Gotcha. I work in this industry, but not as a trader. I figured it would be pretty rough. I too would also love to build my own software stack from the ground up.