Seniro Backend Dev. NodeJS/Typescript

HireTech; Madrid; A distancia; EUR 50.000 - 55.000; A tiempo parcial

Descripción de la vacante

A dynamic technology startup is seeking a Senior Backend Developer with over 10 years of experience to help build a scalable platform. You'll design backend architecture, develop APIs, and integrate with gym management systems. Offering a freelance contract with a salary range of €50,000 to €55,000 gross per year and a fully remote work environment. Ideal candidates will have strong skills in Node.js and SQL databases, along with excellent communication skills in English.

Servicios

Sport card

Private medical care

Formación

• 10+ years of experience building backend systems.
• Production experience with SQL databases, ideally PostgreSQL.
• Strong sense of ownership and commitment to high-quality code.

Responsabilidades

• Design and implement server-side application logic and APIs.
• Integrate with Gym Management Software.
• Support customers by implementing feedback and resolving issues.
• Collaborate with the team for a responsive application.

Conocimientos

Backend systems development

Node.js with TypeScript

SQL databases

Mentoring junior developers

Problem-solving

Agile methodologies

Fluent English (C1)

Descripción del empleo

We are looking for a Senior Backend Developer to join our team and help us build a robust, scalable platform from the ground up, leveraging insights gained from our Beta and current product usage.

You will play a key role in designing and implementing the backend architecture that powers our application and integrations with various gym management systems across Europe.

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