Senior Full Stack Developer

hace 1 semana

Barcelona, Barcelona, España The Keenfolks A tiempo completo 45.000 € - 80.000 € al año
Who We Are

At Keenfolks, we're redefining what it means to be a marketing agency in the age of AI.
We're an integrative AI marketing powerhouse that blends human creativity with cutting-edge technology to craft personalised, high-impact solutions for some of the world's most iconic brands.

We integrate AI into existing marketing operations; we don't just advisewe build, deploy, and operate AI systems that deliver measurable results. We make current marketing investments work harder through intelligent automation and data integration.

If that sounds interesting to you keep reading.

Role Overview: Sr. Full Stack Developer

We're looking for Senior Full Stack Developer to join our fast-growing tech team.

In this role, you'll design, develop, and optimise scalable, high-performance web applications, working across both front-end and back-end environments. You'll collaborate closely with cross-functional teams, integrating modern technologies and best practices to deliver clean, efficient, and impactful AI solutions.

Your Responsibilities

Lead the architecture, design and development of front-end applications using React ) or , following the 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 ) and Python (FastAPI).

• Collaborate closely with Product and Design to translate ideas into clean, efficient, and delightful user experiences.

• Integrate and optimise 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.

• Deploy, manage, and scale projects using SST Framework (Serverless Stack) - Nice to have

Requirements

• 6+ years of professional experience as a Full Stack and Frontend Engineer.

• Deep expertise in TypeScript and modern React ) or development.

• Strong understanding of UI/UX principles and design systems (atomic design, component libraries, accessibility).

• Proficiency with 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.

What We Offer
  • Hybrid Work: 2 days in our beautiful 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
Your Attitude

At Keenfolks, we believe innovation starts with curiosity and courage - the courage to experiment, to fail fast, and to learn faster.

We're constantly pushing boundaries, seeking greatness over comfort, and rewarding those who challenge the status quo.

If you're a visionary who learns from every experience, embraces change, and thinks like an entrepreneur you'll fit right in.

Diversity Matters

At The Keenfolks, we're proud to be an equal opportunity employer.
We believe true innovation thrives in diversity of people, ideas, and perspectives and we're committed to building a culture where everyone belongs and can do their best work.

Want to Know More?

Follow us on LinkedIn to discover our culture, values, and projects shaping the future of AI-driven marketing.

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