The Code That Controls Your Money

By clive Thompson November 11, 2020

COBOL is a coding language older than Weird Al Yankovic. The people who know how to use it are often just as old. It underpins the entire financial system. And it can’t be removed. How a computer language controls the financial life of the world.

When Thomas first started programming, it was 1969. He was a kid just out of high school in Toronto, without any particular life goal. His father was a carpenter, but good luck following in his family’s footsteps; Thomas was all thumbs. “My father knew I couldn’t hammer two pieces of wood together,” he laughs.

So his mother suggested something weird and newfangled: What about… computer programming?

Computers, in 1969, were still strange new curiosities, the size of big cabinets. But companies around the world were realizing they were invaluable for any task that required a lot of rapid-fire accounting, like tallying up payroll. Jobs were on offer to anyone who could learn even a little coding. So Thomas found “some fly-by-night, little pop-up school” in downtown Toronto, and over the next two months, learned the hot computer language of the day: COBOL (Common Business-Oriented Language).

After he graduated, he got hired in the check-sorting department of a major Canadian bank. (He doesn’t want me to name it, banks are secretive; “Thomas,” I should mention, is a pseudonym, if you hadn’t guessed that already.) Thomas wasn’t yet a programmer for the bank then, but over the next few years he made it clear he wanted to be, and his employer paid for him to do a bunch of honest-to-goodness college courses in coding, and in 1978 he began a long career at the bank as a programmer.

Thomas loved it. It was like constant puzzle-solving, a game of mental chess. He’d sit at his desk, writing out his code by hand, then give it to a “punch card operator” who’d put holes in cards to represent his programming instructions. Twice a day they’d feed those cards into the huge “mainframe” computers at the bank. It would take hours for Thomas to find out if his code had actually worked correctly, or whether he’d made a goof that grounded things to a halt. If he did, he’d pore over the error statements, rewrite the COBOL, and try again.

Over the next few years, Thomas became good at COBOL and wrote thousands of invaluable lines of code. When the bank issued payments, it was his code, every day, helping them tally it all up correctly. As the ’70s and ’80s and ’90s wore on, he and his coder colleagues probably wrote tens of millions of lines of COBOL. There’s one system he’s particularly proud of, a lightning-fast program that can process “anywhere between three and five million transactions a day. That’s my baby!” He wrote his first bits of that program in 1988.

And the thing is — that code is still running today.

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https://www.wealthsimple.com/en-ca/magazine/cobol-controls-your-money