Ingeniero de software

Position: Software Engineer - Freelance

Hiring Location: Madrid

Department or business unit: Development

Employment type: Part time - Freelance

Minimum experience required: More than 4 years. Senior Developer.

Remote/Onsite: Hybrid

Why Loud Intelligence?

At Loud Intelligence, you will have the opportunity to work with the most advanced technologies and artificial intelligence solutions in a well-funded startup that fosters your professional growth. Your work will directly impact the campaigns of renowned brands, reaching millions of users through leading platforms, in a flexible and rapidly growing environment.

This role is especially well-suited for senior engineers who enjoy autonomy, want to keep space for personal projects, and are looking to collaborate with a tech-driven, innovative team on the side.

Short Job Description:

We're looking for a Full Stack Developer with solid experience in web technologies (React, Node.js, Next.js) to support us in the evolution of our platform.

This is a part-time role (10-20 hours/week), offering flexibility and ideal for someone looking to contribute meaningfully to a fast-moving startup without giving up other commitments.

You'll work closely with our tech and product team to deliver features in sprints, optimize existing components, and integrate new services-especially around AI and cloud tools.

Tasks:

• Collaborate on the development of product features using React, Next.js, Node.js, and FastAPI.
• Maintain and optimize existing codebase and UI components.
• Contribute to the design and architecture of lightweight scalable modules.
• Participate in integrations with AI tools, including LLMs, embeddings, and vector databases (guided by the core team).
• Attend occasional sprint meetings, demos or reviews (online).
• Work independently, delivering clean and tested code.

Requirements:

• Solid experience (3-5 years) in Full Stack Web Development.
• Strong knowledge of React, Next.js, and Node.js.
• Familiarity with FastAPI and modern RESTful API design.
• Experience using Git, working with branches and pull requests.
• Ability to work in cross-functional teams (tech/product/AI).
• Located in Spain or within EU-friendly time zones.
• Good communication in Spanish.
• Open to work 10-20 hours/week, with flexible availability.

Benefits:

• Growth Opportunity: If there's a strong mutual fit, you may have the chance to join our core team later on.
• Professional Development: Learn hands-on about intelligent agents (MCPs), LLMs, and scalable AI architectures.
• Cutting-edge Technologies: Work with technological innovations and AI solutions that are transforming the industry.
• Direct Impact: Contribute to campaigns for renowned brands, reaching millions of users through leading platforms.
• Office Benefits: Weekly perks at the office building ( free food, coffee & drink, events ).

About our company: