Important: Applications will not be considered if you:
* Do not already hold valid work authorization in Spain (visa sponsorship is not available).
* Are seeking a fully remote position (this role requires office presence of 3 days per week).
The Job:
We are looking for an early‑career
Full‑Stack Developer
who is already confident in
Python
and
React
.
This position is ideal for candidate who would like to join the AI Studio of Top Code S.L.U.. Our senior experts will train them in artificial intelligence, and they will help us further develop our proprietary AI orchestration framework that streamlines the deployment, governance, and scalable integration of intelligent agents across language and visual recognition domains within diverse operational environments.
For more information on the team:
Expanding Horizons: Establishing Our Development Hub - KS-TF AG
The Company:
Top Code S.L.U. is the Madrid-based development hub of KS‑TF AG, created to internalize and strengthen the company's software engineering capabilities. As a wholly owned subsidiary, Top Code S.L.U- unites a team of 17+ experienced developers specializing in Artificial Intelligence, FinTech, and the proprietary KS-TF software suite.
Responsibilities
• Maintain and extend existing Python-based platforms in FastAPI
• Develop and integrate frontend features using React and TypeScript (React Components library based)
• Collaborate with backend and frontend teams to ensure seamless platform transitions
• Refactor and modernize legacy codebases for maintainability and scalability
• Support future migration of outsourced platforms into the in-house ecosystem
Required Skills
• Strong Python (FastAPI) and React/TypeScript with Components architectures experience
• Solid understanding of RESTful APIs, SQL databases, and frontend-backend integration
• Experience with multi-tenant SaaS platforms and secure coding practices
• Familiarity with CI/CD pipelines and version control (Git)
• At least 2 years of experience in the frontend (React)
• At least 2 years of experience in the backend (Python)
Preferred Qualifications
• Experience or training with Agentic coding or LLMs
• Background in fintech or financial platforms
• Bonus: Familiarity with Java to support cross-functional collaboration