Sr. Full Stack Developer

🚀 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 personalized, high-impact strategies for some of the world’s most iconic brands.

We’re a team of bold thinkers, data-driven innovators, and passionate creators who thrive at the intersection of creativity, strategy, and technology.

If that sounds like you — keep reading. 👇

💫 Role Overview: Sr. Full Stack Developer

We’re looking for a skilled and motivated Senior Full Stack Developer to join our fast-growing team.

In this role, you’ll design, develop, and optimize 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 solutions.

🧑‍🚀 Your Responsibilities

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.

🌟 What We Offer

• 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 🙌
• 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 🙌

💫 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 & Instagram @the_keenfolks to discover our culture, values, and projects shaping the future of AI-driven marketing.