Not self-hosted, but I use App in the Air on my phone. Source: 12 months ago

Choosing a globally respected Employer of Record (EOR) as an alternative to overseas subsidiaries, such as Skuad or PapayaGlobal. Such companies may be able to help you manage remote employees without the requirement for a foreign corporation. When considering expansion into new markets, it is critical to weigh the benefits and drawbacks of both approaches for globalization. Source: about 2 years ago

Yes, and most of them can also help your employees relocate to a country where you don't have an entity via EOR (Employer of Record): few more suggestions: https://www.oysterhr.com https://gusto.com https://papayaglobal.com https://pilot.com. - Source: Hacker News / about 2 years ago

Six months after raising $250 million, Papaya Global is making a key acquisition to expand its cloud-based HR and payroll platform globally on the heels of major surge in remote working. The Israeli startup is acquiring Azimo — the London-based money transfer business that Facebook once tried to buy to spearhead its own remittance efforts — a deal that will see Papaya Global moving into more markets, and launching... Source: about 2 years ago

There are some specialised companies to do this, like remote.com or papayaglobal.com but they cost money. Also you need to prepare your US employer that cost of employment will be much higher in Sweden. Source: over 2 years ago

Some of the organizations that provide digital HR platforms for remote teams are Skuad, Omnipresent, Papaya Global, etc. Source: about 3 years ago