KEENFOLKS

Senior Full Stack Developer

KEENFOLKS

full-time

Posted on:

Location Type: Hybrid

Location: Barcelona • 🇪🇸 Spain

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Job Level

Senior

Tech Stack

AWSCloudDockerJavaScriptNext.jsNode.jsPythonReactTypeScriptVue.js

About the role

  • Lead the architecture, design and development of front-end applications using React (Next.js/Vite) or Vue.js, following atomic design principle, with a hands-on approach
  • Build reusable UI components, ensuring a consistent and accessible design system
  • Develop and maintain backend services using TypeScript (Node.js) and Python (FastAPI)
  • Collaborate closely with Product and Design to translate ideas into clean, efficient, and delightful user experiences
  • Integrate and optimize modern AI tooling into the development workflow — from code generation and refactoring to testing and documentation
  • Contribute to architecture decisions, code reviews, and technical strategy
  • (Nice to have) Deploy, manage, and scale projects using SST Framework (Serverless Stack)

Requirements

  • 5+ years of professional experience as a Full Stack or Frontend Engineer
  • Deep expertise in TypeScript and modern React (Next.js) or Vue.js development
  • Strong understanding of UI/UX principles and design systems (atomic design, component libraries, accessibility)
  • Proficiency with Node.js and/or FastAPI (Python) on the backend
  • Solid understanding of modern CI/CD pipelines, API design, and state management
  • Demonstrated experience using AI tools (Claude Code, Cursor, GitHub Copilot, GPT, etc.) to enhance productivity and code quality — be ready to share examples
  • Excellent communication, problem-solving, and collaboration skills
  • Nice to Have: Experience with APIs, Docker, or cloud environments
  • Experience with SST (Serverless Stack) for AWS-based deployments
  • Familiarity with infrastructure-as-code, serverless architectures, and event-driven systems
Benefits
  • Hybrid Work: 2 days in our beautiful Barcelona office, 3 from home
  • Free Lunch on office days
  • Coffee, tea & fresh fruit always available
  • Office fun: ping pong, yoga, and social activities
  • Free Friday afternoons
  • Afterworks & team buildings every month
  • Work from anywhere for 30 days/year
  • Birthday day off to celebrate your day
  • 23 vacation days + 2 personal days
  • Learning & Development Program focused on AI innovation
  • Career growth and continuous upskilling opportunities
  • A dynamic, entrepreneurial culture that values creativity, trust, and constructive freedom

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
ReactNext.jsViteVue.jsTypeScriptNode.jsPythonFastAPICI/CDAPI design
Soft skills
communicationproblem-solvingcollaboration