Houston-based CS Disco Inc., which makes software for law firms, has opened a product development office in northwest Austin that executives expect could employ as many as 25 workers within two years. CS Disco moved 12 of its 60 employees into the office on July 20 to take advantage of Austin's deeper pool of technology workers — especially those with experience in big data, said Keith Zoellner, vice president of engineering and product development. "We've been growing in Houston," he said, "just…