Senior Full-Stack Developer (NodeJS/Typescript) (m/f/x)

Department: Business Partner Transparency

Employment Type: Permanent - Full Time

Location: Mannheim

Description

About osapiens

At osapiens, more than 550 talented minds unite around one mission: enabling sustainable growth for businesses worldwide. Founded in 2018 and headquartered in Mannheim, Germany, we have built the AI-driven osapiens HUB - a multi-tenant platform hosting 26 enterprise-grade solutions designed for cross-company collaboration, automation, and compliance. With offices across Europe and the US, we are shaping the future of scalable and secure business technology.

Your Mission

Join osapiens to scale our solutions focusing on one of the following areas:

• Business Partner Transparency
• Product Transparency
• Operations Efficiency

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.

We are looking for multiple talents to join our teams in Mannheim, a vibrant tech hub at the heart of Germany. Here in our global headquarters, we embrace a hybrid work model, with three days a week in the office, ensuring the perfect balance between in-person collaboration and remote flexibility.

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+).

Join us for this and more...

• A purpose-driven mission tackling complex sustainability challenges while working alongside global industry pioneers at a fast-growing unicorn company
• Room for creativity through collaborative teamwork and an open communication culture
• Flexibility and team bonding with our hybrid work options
• Fuel for your growth journey, both personally and professionally
• Sustainable mobility options, promoting eco-friendly commuting solutions
• Fun team events and outings with our global teams
• Inspiring workspaces in Mannheim and beyond