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Principal Full Stack Software Engineer Job Opening In Madrid – Now Hiring SGS


Job description

Job Description

This is a role for a product-minded engineer who believes that world-class user experiences are built on a foundation of world-class code.

You won't just be building features; you'll be crafting entire products, from the database to the user interface. This is a role with massive leverage.

As our foundational Principal Full Stack Engineer, your mission is to own the end-to-end development of our flagship digital products.

You will lead the development of our most ambitious web applications while simultaneously building and championing a comprehensive library of reusable components and patterns (both frontend and backend).

Your goal is to create beautiful, fast, and accessible user interfaces powered by scalable and resilient backend services, and to empower all teams to do the same.

What You'll Build and Own

  • Lead Frontend Architecture: Design and implement the technical architecture for complex, data-rich, and highly interactive web applications, including backend services, APIs, and frontend structure.

  • Own the Component & Pattern Library: Build, maintain, and evangelize our central component library and design system (, using Storybook), as well as reusable backend patterns, ensuring consistency and quality across all products.

  • Build End-to-End Products: Act as the lead hands-on developer for our most critical products, setting the bar for code quality, performance, and user experience across the entire stack.

  • Be the Voice of the User: Partner closely with product and design to translate user needs into elegant and effective technical solutions.
  • Optimize for Developer Velocity: Own the full stack build tooling, testing strategies, and monorepo structure to create a fast, modern, and enjoyable development environment for all engineers.
  • Qualifications

  • Frontend Expertise: Expert-level proficiency in React and TypeScript.

    Deep experience building and scaling complex single-page applications.
  • Backend Expertise: Proven experience building and shipping backend services and APIs using a modern stack (, , Go, or Python) and working with databases like PostgreSQL.

  • Design Systems & Tooling: Proven experience building and maintaining a component library from the ground up using tools like Storybook and Chromatic.
  • Modern Web Stack: Mastery of modern CSS (, CSS-in-JS, Tailwind CSS), web accessibility (WCAG), and frontend performance optimization techniques.
  • Engineering & DevOps: Expertise with modern build tools (Vite, Webpack), testing frameworks (Jest, Cypress, Playwright), and monorepo management (Nx, Turborepo).
  • Who You Are

  • You are a seasoned software engineer (8+ years) with a deep passion for building great products, from the API to the UI.

  • You are a pixel-perfect builder who is also pragmatic and understands the need to ship.
  • You have a product mindset, viewing your fellow developers as customers of the tools and libraries you create.
  • You are an excellent communicator who can articulate technical decisions and advocate for both the user and the developer.
  • Required Skill Profession

    Computer Occupations


    • Job Details

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    The Work Culture

    An organization's rules and standards set how people should be treated in the office and how different situations should be handled. The work culture at SGS adheres to the cultural norms as outlined by Expertini.

    The fundamental ethical values are:

    1. Independence

    2. Loyalty

    3. Impartiapty

    4. Integrity

    5. Accountabipty

    6. Respect for human rights

    7. Obeying Spain laws and regulations

    What Is the Average Salary Range for Principal Full Stack Software Engineer Positions?

    The average salary range for a varies, but the pay scale is rated "Standard" in Madrid. Salary levels may vary depending on your industry, experience, and skills. It's essential to research and negotiate effectively. We advise reading the full job specification before proceeding with the application to understand the salary package.

    What Are the Key Qualifications for Principal Full Stack Software Engineer?

    Key qualifications for Principal Full Stack Software Engineer typically include Computer Occupations and a list of qualifications and expertise as mentioned in the job specification. The generic skills are mostly outlined by the . Be sure to check the specific job listing for detailed requirements and qualifications.

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    Interview Tips for Principal Full Stack Software Engineer Job Success

    SGS interview tips for Principal Full Stack Software Engineer

    Here are some tips to help you prepare for and ace your Principal Full Stack Software Engineer job interview:

    Before the Interview:

    Research: Learn about the SGS's mission, values, products, and the specific job requirements and get further information about

    Other Openings

    Practice: Prepare answers to common interview questions and rehearse using the STAR method (Situation, Task, Action, Result) to showcase your skills and experiences.

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    During the Interview:

    Be Punctual: Arrive on time to demonstrate professionalism and respect.

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    By following these tips, you can increase your chances of making a positive impression and landing the job!

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