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osapiens

Senior Backend Developer – Typescript

osapiens

Senior Backend Developer shaping Business Partner Transparency within osapiens HUB for international clients. Collaborating with a forward-thinking team in Madrid while embracing a hybrid work model.

Posted 6/2/2026full-timeMadrid • 🇪🇸 SpainSeniorWebsite

Tech Stack

Tools & technologies
JavaScriptNode.jsTypeScript

About the role

Key responsibilities & impact
  • Design, build, and optimize backend 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 (4-6 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 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

What you’ll need
  • Strong experience in backend development with a focus on Node.js and TypeScript.
  • Expertise in web services development and integration (REST etc.).
  • Hands‑on experience leveraging AI‑guided development practices and collaborating within agentic, AI‑driven engineering environments.
  • 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 (C1 or equivalent) in English. German and/or Spanish skills are a plus, (but not necessary).

Benefits

Comp & perks
  • 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.
  • Sustainable mobility options, promoting eco-friendly commuting solutions.
  • Fun team events and outings with our global teams.

ATS Keywords

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Applicant Tracking System Keywords

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

Hard Skills & Tools
backend developmentNode.jsTypeScriptweb services developmentRESTAI-guided development practicescontinuous integrationcontinuous deploymentautomated testingarchitecture design
Soft Skills
collaborationmentoringcommunicationproduct mindsetagile experienceinnovationprocess improvementlearning cultureteam supportuser experience consideration