Factor in the full week, including week end at extra fees, the perks costs, the insurance, the office, the pension. A 5 figure sum seems perfectly reasonable!

However, it's not take-home pay and it's not for basic development.

If you charge $150/hr and work a 2 week blitz for 100 hours/week.

It's possible.

After perusing his Twitter I'd say he has escaped basic software development.