osapiens

Senior Full-Stack Developer – NodeJS/Typescript

osapiens

full-time

Posted on:

Location Type: Hybrid

Location: Madrid • Spain

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Job Level

Senior

Tech Stack

GraphQLJavaScriptNode.jsReactTypeScript

About the role

  • Design, build, and optimize full-stack features using modern front-end and back-end 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 JavaScript-based solutions, optimizing for 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.

Requirements

  • Strong experience in full-stack development with a focus on Node.js (Mainly) and Typescript. ReactJS, JavaScript is also good to bring.
  • 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
  • An Unicorn with purpose-driven mission with and for global industry pioneers in tackling complex challenges
  • 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 Madrid
  • 25 days vacations
  • Health Care Insurance
Applicant Tracking System Keywords

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

Hard Skills & Tools
full-stack developmentNode.jsTypescriptReactJSJavaScriptweb services developmentRESTGraphQLautomated testingcontinuous integration/deployment
Soft Skills
product mindsetcommunication skillsmentoringcollaborationagile experienceproblem-solvinginnovationtechnical excellenceuser experience considerationteamwork