RemoteTaxCalc is a micro-SaaS that solves one specific problem: figuring out what you actually take home after taxes when working remotely in different countries.
It computes income tax and social contributions for both employees and contractors across 10 countries (Poland, Portugal, Spain, Estonia, Germany, Netherlands, UK, US, Canada, Singapore), then shows the results side by side.
Built as a solo project. The kind of tool I wished existed when I was comparing remote work options across Europe.