HASH: a free, online platform for modeling the world – Joel on Software

I’m Joel Spolsky, a software developer in New York City. More about me.
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For my day job, I'm the co-founder and CEO of Stack Overflow, the largest online community for programmers to learn, share their knowledge, and level up. Each month, more than 40 million professional and aspiring programmers visit Stack Overflow to ask and answer questions and find better jobs. Stack Overflow is also the flagship site of the Stack Exchange network, 160+ question and answer sites dedicated to all kinds of topics from cooking to gaming. According to Quantcast, Stack Overflow is the 30th largest web property in the United States and in the top 100 in the world.
I also founded Fog Creek Software, one of the most influential small tech companies in the world. As an independent, privately-owned company, we’ve been making customers happy since the turn of the century. We share what we've learned about how to make great software, both by writing about our ideas and by creating products, like FogBugz, Trello and Gomix, that help others make great technology. As a result, Fog Creek's impact on the world of developers rivals companies a thousand times our size.
Sometimes when you’re trying to figure out the way the world works, basic math is enough to get you going. If we increase the hot water flow by x, the temperature of the mixture goes up by y.
Sometimes you’re working on something that’s just too complicated for that, and you can’t even begin to guess how the inputs affect the outputs. At the warehouse, everything seems to go fine when you have less than four employees, but when you hit five employees, they get in each others’ way so much that the fifth employee effectively does no additional work.
You may not understand the relationship between the number of employees and the throughput of the warehouse, but you definitely know what everybody is doing. If you can imagine writing a little bit of JavaScript code to simulate the behavior of each of your workers, you can run a simulation and see what actually happens. You can tweak the parameters and the rules the employees follow to see how it would help, and you can really gain some traction understanding, and then solving, very complex problems.
That’s what hash.ai is all about. Read Dei’s launch blog post, then try building your own simulations!
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In 2000 I co-founded Fog Creek Software, where we created lots of cool things like the FogBugz bug tracker, Trello, and Glitch. I also worked with Jeff Atwood to create Stack Overflow and served as CEO of Stack Overflow from 2010-2019. Today I serve as the chairman of the board for Stack Overflow, Glitch, and HASH.