Senior Full-Stack Developer

Senior Full-Stack Developer

osapiens

Mannheim, Germany

As a passionate Senior Full-Stack Developer (m/f/x) with a strong background in Typescript, Node.js and React, you will be developing new products at the intersection of enterprise software and environmental intelligence.

Your Responsibilities

• Design, build, and optimize full-stack features using modern frontend and backend technologies, ensuring scalability and maintainability;
• Develop and enhance innovative software solutions that automate complex compliance workflows for businesses of all sizes;
• Collaborate closely with product managers, designers, and engineers in small, agile squads (5-7 people) to define, refine, and implement features;
• Ensure high-quality, secure, and efficient code through rigorous reviews, automated testing, and continuous integration/deployment (CI/CD) practices;
• Own the architecture and design of solutions, optimizing performance, reliability, and user experience;
• Contribute to technical strategy and decision-making, identifying opportunities for innovation and process improvements;
• Mentor and support junior developers, fostering a culture of learning and technical excellence within the team.

Your Experience

• Strong experience in full-stack development with a focus on Typescript (mandatory), Node.js (mainly), React and Javascript;
• Expertise in web services development and integration (REST, GraphQL, etc.);
• Familiarity with Git for version control and collaboration;
• Strong product mindset – you think beyond code, considering user experience, business impact, and scalability;
• Agile experience – comfortable working in sprints, participating in stand-ups, and iterating quickly;
• Excellent communication skills in English (C1). German is a bonus (B1+).