I started https://ipinfo.io as a small side project 6 years ago, and it has since grown to now handling over 20 billion API requests a month, thousands of customers, is used by hundreds of thousands of developers. We’re bootstrapped, profitable, and growing. Here’s a recent interview where I talk a bit about the company: https://securitytrails.com/blog/ben-dowling-ipinfo

We’re a small, remote team, with big ambitions. We’re looking to add exceptional people to our team. If you’re interested in IP address data and working on fun problems like VPN detection, active IP scanning and measurement, big data processing, scraping or helping us market and grow IPinfo then get in touch!