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> The funny thing is that equipment wasn't even mine,

Did you have a reputation for being good at debugging things? Expertise and experience in one area often has crossover in connected systems.

I got pulled in to advise on an automated options market making system written in Java when the closest I'd done was equity execution algorithms in Slang and C++ (and integration with the options automated delta hedging facility).

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Yea I did alot of debugging of the networks hardest problems, and the crossover is especially true with telecom systems since all the inter-connectivity comes from the standards bodies, which share a lot of the same base and history. But some stuff differed as well, it was difficult for a bunch of the hardened circuit switched folks to move to an all IP world, and I only had a cursory view into the circuit switched world which was on it's way out when I was in industry.

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