Bachelor's or Master’s Degree in Software Development, Computer Science, or related fields. At least 3 years of professional experience with Ruby and key ecosystem tools (RSpec, Bundler). Advanced English proficiency (C1) or above. Confident use of Git and standard Linux CLI tools. Hands-on experience with containerization (Docker) and CI/CD pipelines. Deep understanding of testing principles and test-driven development (TDD). Strong skills in debugging, profiling, and code optimization.