Task: - Design and build secure, scalable back-end services and REST APIs using TypeScript and Node.js. - Implement authentication, user management, notifications and system integrations; handle data exchange between internal systems and the platform hub. — Manage deployment and maintenance on AWS (ECS, Lambda, S3, CloudWatch). - Deliver test coverage, monitoring and clear technical documentation. About You: - 5+ years in software development with strong expertise in TypeScript and Node.js. - Solid experience with AWS services (ECS, Lambda, S3, CloudWatch) and API design for scalability and automation. - Comfortable using AI-assisted coding tools (e.g., Claude Code) and working autonomously with strong attention to detail. - Excellent collaboration and communication skills; fluent in English (written and spoken). - Available for full-time freelance engagement and able to work remotely. Must hold freelance tax status (P.iva) as required. About Us: BIOSS (part of Gruppo Cosmico) connects digital talent with high-impact projects across coding, design, marketing and data. We partner with consultancies, digital agencies and international startups to build modern platforms and products and foster a community of skilled professionals. Duration: Initial 3-month contract with strong possibility of renewal. Start: Late October / Early November 2025. Full-time effort expected. Remote collaboration. Original Language of Job Posting: Italian