Senior UI Engineer — AI Visualization & Platform Tools

Mastercard; Bray; On-site; EUR 90,000 - 120,000; Full time

Job summary

Mastercard is seeking a Senior UI Developer to join an AI product team building foundation model capabilities with enterprise impact. You will design and build frontend applications for internal tooling and external self-service tools, delivering intuitive experiences from complex model outputs.

You will work with AI engineers, data scientists, and MLOps to bring capabilities to market, focusing on robust UI architecture, testing, and collaboration across backend and data platforms.

Qualifications

• Strong production-grade frontend development experience in React or Python-based data apps.
• Experience integrating frontends with REST APIs and authentication.
• Familiarity with advanced visualization libraries (D3.js, Deck.gl, Plotly).
• Experience with Databricks Apps hosting is a plus.
• Strong UI/UX instincts and ability to design for mixed technical audiences.

Responsibilities

• Design and build advanced, interactive visualization tooling for embeddings and model outputs.
• Design and build self-service applications for end users, including submitting requests and tracking jobs.
• Design and build prototypes for future product versions and demos.
• Collaborate with AI and data engineers on tooling requirements and interfaces.
• Own frontend code quality, testing, and documentation.
• Support production issues spanning frontend and backend layers.

Skills

React

Streamlit

Dash

REST APIs

UI/UX design

D3.js

deck.gl

Plotly

Databricks Apps

SQL

CI/CD

Testing

Tools

Databricks Apps

Job description

Mastercard is seeking a Senior UI Developer to join an AI product team building foundation model capabilities with enterprise impact. You will design and build frontend applications for internal tooling and external self-service tools, delivering intuitive experiences from complex model outputs.

You will work with AI engineers, data scientists, and MLOps to bring capabilities to market, focusing on robust UI architecture, testing, and collaboration across backend and data platforms.