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 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 ECharts, Chart.js or Recharts.
- Strong problem-solving and analytical skills.
- Good communication and teamwork skills.
- Comfortable working in a fast-paced environment and dealing with ambiguity.

Nice to Have

- Experience with CI/CD pipelines, particularly GitHub Actions.
- Experience with Docker and containerized applications.
- Knowledge of serverless architectures.
- Experience with SonarCloud or Snyk.
- Familiarity with TurboRepo / monorepos.
- Experience with Storybook for UI component development.
- Experience with Gherkin, Cucumber and Playwright.

If you're looking for an opportunity to work with modern technologies and contribute to innovative AI-driven products within a general aviation group, we'd love to hear from you.

📌 B | Fullstack (Python, Next & React) Developer | Barcelona, Spain
🏢 Optiwisers
📍 Barcelona