Senior Full-Stack Developer

osapiens

full-time

Posted on: 2/26/2026

Location Type: Hybrid

Location: Mannheim • Germany

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About the role

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.

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+).

Benefits

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

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

full-stack developmentTypescriptNode.jsReactJavascriptweb services developmentRESTGraphQLautomated testingcontinuous integration/deployment

Soft Skills

product mindsetcommunication skillsmentoringcollaborationagile experienceinnovationprocess improvementsuser experienceteam supportlearning culture