I'm working with a fast-growing tech business that’s scaling their engineering function and looking to onboard a Senior Fullstack Engineer on a freelance basis.You’ll be joining a highly collaborative team working on a platform focused on real-world impact, with a solid tech stack across Ruby on Rails, React, and AWS.Location: Fully remote Contract type: Freelance (B2B)Rate: €260 per dayMust have:5+ years' experience in fullstack rolesStrong hands-on with Ruby on RailsFrontend experience using React (or similar JS frameworks)Strong understanding of REST APIs, OOP, SOLID principlesTesting mindset – experience with RSpec, CapybaraExposure to AWS services (S3, EC2, CloudFront etc.)Experience working in Agile teamsNice to have:Experience in Health techSpanish language (bonus, not essential)Experience with CI/CD tools – GitHub Actions, CapistranoSidekiq, PostgreSQL, NoSQLMonitoring tools – Datadog, Sentry, New RelicIf you’re available and keen to explore something new, feel free to reach out directly or drop your CV below – happy to share more details.