Posted: Sun Dec 6, 2020 8:41am
Realistically time for gaining residency in Spain is rapidly running out, if not already run out, and if you can't do it before Dec 31st then to come to Spain with the intention of working after that will be a completely different proposition.
Critically you will have to, in advance, apply for a working visa for which you will need to show either an intent to start up a business, including your business plan and proof of the financial resources to execute it, or a confirmed job offer from a potential employer.
For that the employer in turn will need to show that the job you are coming to do cannot be done by a Spanish citizen so that means it would have to be something highly specialised or unique. Would that describe your skill set?
A 3rd. option is the so called (Golden Visa) which is available to those with at least €500,000 in cash to buy a property outright, or I believe to invest in a Spanish business.
Taking a guess that you might not have a spare €500,000 laying around I will not elaborate!