Senior Backend Developer Needed (1-month, long-term possibility)

We are 10lift, an early-stage B2B SaaS company focused on employee engagement and wellbeing, located in Berlin. We currently have an MVP and need a developer to work on the product until we hire for this position (fully remote). This also means upon mutual satisfaction the position could turn into a long-term contract (with possible visa sponsorship). This person will be working with guidance from our Tech Lead and advisors. We need this person to be comfortable with: *Node.js *Express framework *REST APIs *PgSQL *Firebase Since this is only for 1 month, we can't afford to teach anything on the job, therefore would highly appreciate applicants experienced with our current stack.