GrepJob
OnHires

Senior Full-Stack Software Engineer

OnHires
Apply
about 2 hours ago
Barcelona, SpainSenior / Mid Level

Responsibilities

  • Own product development from concept to production.
  • Design and build scalable full-stack applications.
  • Develop modern backend services and intuitive frontend experiences.
  • Translate customer needs into elegant technical solutions.
  • Write clean, maintainable, production-ready code.
  • Collaborate directly with founders, engineers, and customers.
  • Review code and contribute to engineering best practices.
  • Improve infrastructure, CI/CD pipelines, cloud deployments, and observability.
  • Build and integrate AI-powered capabilities across the platform.
  • Help shape the engineering culture as the team grows.

Requirements

  • 3–6+ years of professional software engineering experience.
  • Strong experience building production SaaS applications.
  • Excellent TypeScript skills across the full stack.
  • Experience with React or another modern frontend framework.
  • Strong backend development experience and API design.
  • Solid understanding of PostgreSQL or other relational databases.
  • Experience with Docker, CI/CD, and cloud infrastructure (AWS, GCP, or Azure).
  • Strong debugging, analytical, and problem-solving skills.
  • Product mindset with the ability to take ownership from idea to delivery.
  • Comfortable working in a fast-moving startup environment.
  • Experience using AI development tools and modern LLM workflows.
  • Fluent English.
  • Based in Barcelona or willing to relocate.

Benefits

  • Build a category-defining AI platform from an early stage.
  • Work directly with experienced founders and technical leaders.
  • Own meaningful product decisions and features from day one.
  • Solve challenging engineering problems with real-world impact.
  • Competitive salary plus meaningful equity.
  • Join a high-performing team where your work will directly shape the future of the company.
  • Language learning is supported by the company.