Senior Web Application Developer (m/f/d)

About the Team

At ZF, we are empowering the business with data. We are looking for a Senior Web Application Developer to join our growing UI/Visualization team in Wroclaw or Warsaw. You will work within agile Squads, collaborating closely with Data Scientists, Product Owners, and Engineers to deliver high-impact solutions.

What you can look forward to as a Senior Web Application Developer (m/f/d):

• High-Performance Web Apps: Design and build scalable web applications using Python Dash or Shiny for Python (PyShiny). You will ensure applications load instantly and handle complex state management for concurrent users.
• Backend Integration: Create robust interfaces between the UI and backend Python execution engines (e.g., triggering complex simulations with user-defined inputs) while maintaining UI responsiveness.
• Enterprise Features: Implement essential enterprise functionality, including User Authentication (SSO), Role-Based Access Control (RBAC) for thousands of users, user configuration persistence, and strict audit trails/history.
• User-Centric Design: Collaborate with the Product Owner to translate business requirements into intuitive interfaces. You are the guardian of the User Experience—ensuring our tools are not just functional, but a joy to use.
• Optimization: Relentlessly optimize application performance (caching, asynchronous callbacks) to ensure speed and reliability even under heavy load.
• GenAI Integration: Actively use Generative AI tools (e.g., Copilot, Gemini) in your daily workflow to accelerate boilerplate code generation, write unit tests, and refactor logic.
• Innovation: Push the boundaries of what is possible in the Python web stack, experimenting with new libraries and AI-assisted UI generation.
• Squad Work: Operate as the primary web developer within cross-functional squads, defining the frontend architecture for new products.

Your Profile as a Senior Web Application Developer (m/f/d):

• At least a Bachelor’s Degree in a related field, e.g. IT, engineering, business management.
• About 5 years of experience in Web Application Development, with a strong focus on the Python ecosystem.
• Framework Mastery: Deep expertise in building production-ready apps with Dash or PyShiny. You know how to handle global state, caching (Redis), and asynchronous tasks (Celery/background workers).
• Security Mindset: Proven experience implementing Authentication/Authorization (OAuth) and managing user permissions (RBAC) in a corporate environment.
• Data Handling: Experience designing apps that write back to databases (SQL) and maintain audit logs.
• Internal
• Business Fluency: You understand that code is a means to a business end. You focus on value, speed to market, and user adoption.
• AI Enthusiast: You are comfortable and excited about using AI tools to code faster and smarter.
• Communication: Excellent fluency in English (written and verbal). You can explain technical UI limitations to non-technical stakeholders.

Why you should choose ZF in Poland?

• Contract of employment with a flexible hybrid work model.
• Enjoy flexible working hours tailored to your role and team.
• Work in a diverse, international environment with cross-functional teams and stakeholders.
• Access private medical care through Lux Med and life insurance under favorable terms.
• Use the MyBenefit platform for sport activities, wellness, travel, entertainment, and more.
• Be part of a collaborative team that values open communication, mutual support, and a positive working atmosphere.