B2B | Fullstack (Python, Next & React) Developer | Barcelona, Spain

? Location: Barcelona, Spain
? Work model: Hybrid – 2–3 days per week onsite
? Seniority: Senior
? Contract: B2B / Freelance – Long-term opportunity
? Languages: English & Spanish
? ? Technology: Next.js, React, TypeScript/JavaScript, Tailwind CSS, Python, FastAPI, AWS

About the Role
We are looking for a Senior Full Stack Developer to join an innovative team working on AI-driven solutions.
You will contribute to the development of scalable and high-performing web applications, working across both frontend and backend technologies. You’ll be part of a collaborative Scrum Agile environment, working closely with developers, designers and product managers to deliver high-quality solutions.

What You’ll Do
• Develop and maintain web applications using Next.js and React.
• Build responsive and modern user interfaces using Tailwind CSS.
• Collaborate with backend engineers to design, integrate and test APIs using Python and FastAPI.
• Develop and maintain backend components in Python.




• Write and maintain automated tests using pytest, Gherkin, Cucumber and Playwright.
• Work with AWS cloud services, ensuring applications are scalable, reliable and secure.
• Troubleshoot, debug and optimize applications for performance and scalability.
• Work with charting libraries such as ECharts, Chart.js or Recharts.
• Participate actively in Scrum ceremonies, including daily stand-ups, sprint planning and retrospectives.
• Collaborate with designers, developers and product managers to deliver new features.
• Contribute to code quality, security and development best practices.
• Mentor junior developers and provide technical guidance when needed.

What We’re Looking For
• 4–5+ years of professional experience in Full Stack Development.
• Strong experience with Next.js and React.
• Experience building responsive UIs with Tailwind CSS.
• Experience with Python and backend development, ideally with FastAPI.
• Hands-on ex

📌 B | Fullstack (Barcelona)
🏢 Optiwisers
📍 Barcelona