I am also looking for a specific hacker!tony fic, where he goes to a company hq to talk about buying their algae something or other (green energy?) And he doesn't have the suitcase but he has his trusty cellphone to hack security and plan a takedown of invading terrorists. The terrorists somehow had Steve's shield and Cap was happy they found it. Definitely written post-IM2 and pre-CA or Avengers.
ETA: recs still terribly appreciated!