There's not much of an ecosystem, but rather good companies in both places: - madrid: cartodb, ontruck, jobandtalent, cabify,... - bcn: typeform, wallapop,... Some of those previous companies have English as the working language, so that shouldn't be a problem. But in some companies, even the senior leadership might struggle with English. You will need to test that during the recruiting process :) Freelancing might be more challenging, because of the smaller pool of opportunities. Salaries are 20-30% lower than in London, but as a foreigner relocating to Spain, you have a tax break that makes the net salary closer.

A bit of background in case you're interested:

I'm an investor excited about all kinds of geeky topics - dev tools, security, drones, hardware, machine learning...

I try to stay close to the latest developments in tech to understand what can be achieved with the technology today and what and how can that be translated into good products.

Last year, I already tried to "predict" what could be the evolution of deeper tech in 2016. I failed quite a lot... This year, I'm trying again... but I would love to learn from the wisdom of the crowd.

In case you're curious:

1) My review of 2016 https://medium.com/point-nine-news/reviewing-18-geeky-predic...

2) My 2017 predictions https://medium.com/point-nine-news/18-geeky-predictions-2017...

Thanks for reading.

I might not have been clear enough, when I mean "API" I mean stuff like keen.io, algolia, contentful and others, which are SaaS products with an API-only/-first mentality.

It's not a an API "connector" for a SaaS product, but the API is the product.

API in such case is not the product. A service exposing the API is the product. You don't license interfaces for other to implement, so you don't seel API.