The Blue Card is a European visa for highly-skilled people from non-EU countries.
On paper, the Blue Card has been adopted by all EU-member states (excluding the UK, Ireland and Denmark).
Given the short supply of software developers in Europe, the Blue Card can sometimes be the only option for non-EU devs. Here an infographic by Emma Tracey from Honeypot.io, the Developer-Focused Job Platform
If you still need help on visa for Europe, ask www.migreat.com online visa assistant for guidance.