Senior AI Frontend Engineer

Mastercard; Donabate; On-site; EUR 75,000 - 110,000; Full time

Job summary

Mastercard is seeking a Senior UI Developer to join an AI product team building foundational model capabilities. You will design and build frontend applications for internal tooling and self-service experiences, turning model outputs into intuitive interfaces.

You will work with AI engineers, data scientists and software developers to deliver interactive visualization tools, dashboards and demos. The role emphasizes scalable frontend architecture and robust code quality.

Qualifications

• Strong production frontend development with React and/or Python data-apps (Streamlit or Dash).
• Experience integrating frontend with REST APIs including auth and async job patterns.
• Familiarity with visualization libraries for advanced/interactive rendering (D3.js, deck.gl, Plotly).
• Familiarity with Databricks Apps hosting and constraints.
• Advanced data visualization including interactive tooling (filters, drill-down, dynamic re-render).
• Comfort designing for mixed technical audiences (AI engineers to product teams).
• Fluency in SQL or querying Unity Catalog.
• Strong UI/UX instincts with autonomous design decisions.
• Solid testing and CI/CD practices for frontend code.
• Clear communicator with backend, data and AI teams.

Responsibilities

• Design and build advanced interactive visualization tooling for embeddings and model outputs.
• Build self-service applications for end users with API integration.
• Create prototypes for future product versions and executive demos.
• Develop internal tooling for AI teams to accelerate product work.
• Maintain frontend apps on Databricks App hosting and API integration.
• Collaborate with engineers to align on contract, auth, and versioning of APIs.
• Contribute to frontend architecture decisions as the platform grows.
• Own frontend code quality, structure, testing and documentation.
• Support production frontend issues and coordinate with backend when needed.

Skills

React

Python Dash/Streamlit

REST APIs

Data visualization

SQL

UI/UX

CI/CD

Communication

D3.js

Plotly/Deck.gl

Tools

Databricks Apps

Plotly

Deck.gl

D3.js

Job description

Mastercard is seeking a Senior UI Developer to join an AI product team building foundational model capabilities. You will design and build frontend applications for internal tooling and self-service experiences, turning model outputs into intuitive interfaces.

You will work with AI engineers, data scientists and software developers to deliver interactive visualization tools, dashboards and demos. The role emphasizes scalable frontend architecture and robust code quality.