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Urgent! Seniro Backend Dev. NodeJS/Typescript - Local Job Opening in Madrid

Seniro Backend Dev. NodeJS/Typescript



Job description

Senior Backend Developer

We are looking for a Senior Backend Developer to join our team in Madrid to build a robust, scalable platform from the ground up.

Your Responsibilities

  • Design and implement the server-side application logic, develop APIs, create libraries, and manage system components.

  • Integrate with external services, such as different Gym Management Software, to enhance functionality and provide data insights.

  • Support our customers by implementing their feedback and resolving technical issues.

  • Collaborate closely with the team to build a consistent, efficient, and responsive application.

  • Write clean, maintainable, and well-tested code.

  • Communicate directly with clients for product conception, onboarding, and training purposes.

  • Occasionally travel within Europe to better understand gym workflows and user needs.

Required Skills & Experience

  • 10+ years of experience building backend systems (including at least 1 year using Node.js with TypeScript)
  • Proven production experience with SQL databases (ideally PostgreSQL using Prisma ORM)
  • Passion for mentoring and sharing knowledge with less experienced developers
  • Strong sense of ownership and commitment to writing high-quality, testable code
  • Fast learner with a creative mindset and problem-solving attitude
  • Customer‑obsessed mindset you deeply care about user experience
  • Experience working in agile, fast‑paced startup environments
  • Excellent communication skills; fluent English (C1 level)

What We Offer

  • Contract type: Freelance / Self‑Employed (Autónomo)
  • Salary range: 50,000-55,000 gross per year
  • Fully remote work environment
  • Sport card to support your fitness goals
  • Private medical care
  • Exciting opportunity to shape a product from the ground up within a dynamic startup environment

Employment Details

  • Seniority level: Not applicable
  • Employment type: Full-time
  • Job function: Information Technology
  • Industries: Technology, Information and Media

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Required Skill Profession

Informática Y Tecnología



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