Markus Reichel had admitted to handing over "scores of documents and internal information" to the CIA, including names and addresses of agents for the Federal Intelligence Service or BND, in exchange for 95,000 euros (USD 107,000).
Some 200 of those documents sent to the CIA were deemed very sensitive, and even included papers detailing the BND's counter-espionage strategies.
The 32-year-old had also delivered three classified documents to the Russian secret service.
Partially disabled after a botched childhood vaccination, Reichel, who speaks haltingly, had admitted that he had spied for foreign services out of dissatisfaction with his job at the BND.
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"No one trusted me with anything at the BND. At the CIA it was different," he told the court at the opening of his trial in November.
Not only did the CIA offer "adventure", the Americans also gave him what he craved -- recognition.
"I wanted something new, to experience something exciting," he added.
After finishing his studies at a training centre for the disabled in 2004, Reichel had struggled to find a job until late 2007, when the BND offered him a position in its personnel division.
As a member of staff in the lowest salary band, he drew a monthly net pay of 1,200 euros.
The CIA did not pay him significantly more -- he received between 10,000 and 20,000 euros a year in cash at a secret meeting point in Austria, but it gave him a thrill, he said.