Senior Fullstack Developer (m/w/d) - Claude Code Expert

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Fullstack Developer (m/w/d) - Claude Code Expert based in Brazil. We are looking for an experienced Senior Fullstack Developer with strong expertise in AI-assisted software development, particularly Claude Code, to support the launch and continued evolution of an innovative online marketplace for life coaching and counseling. You will help finalize essential product features, strengthen development practices, and transition the platform from active development into stable operations. With a strong focus on backend engineering, you will build reliable APIs, secure authentication systems, and scalable cloud-based integrations. You will also contribute to frontend development, infrastructure evaluation, and long-term technical planning. Working alongside an experienced team, you will have the autonomy to introduce best practices, solve complex engineering challenges, and influence important technical decisions. This opportunity is ideal for a proactive developer who values clean code, creative problem-solving, and building technology with a meaningful real-world impact.