Senior Software Engineer position in Copenhagen. Responsibilities include leading development of B2B web applications, participating in design discussions, implementing new features, troubleshooting software, and mentoring junior engineers. Requires senior-level experience in full-stack application development, proficiency in React and Node.js, and AWS experience. Competitive salary with bonus, 25 days holiday (plus 5 after 1 year), paid volunteering days, health package, pension, and access to learning resources. Flexible working options available.