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 ECha

📌 B | Fullstack (Barcelona)
🏢 Optiwisers
📍 Barcelona