B2B | Fullstack (Python, Next & React) Developer | Barcelona, Spain
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 experience with AWS services such as EC2, S3, Lambda and RDS.
- Experience with automated testing and pytest.
- Familiarity with Git and modern software development practices.
- Experience working in a Scrum/Agile environment.
- Experience with charting libraries such as ECh

📌 B | Fullstack (Barcelona)
🏢 Optiwisers
📍 Barcelona