look for small to medium companies that do contract research and support work for the US DOD, lots of sys admin opportunities and lots of compartmentalization due to various rules and regulations
You should look at Elastic's job postings, those are all remote and the devs I've met from there, while sociable, are not social butterflies. Also, Raiffeisen and several other banks have positions listed that may be what you are looking for. Most other companies that aren't startups will probably want German language skills.