Senior Frontend Engineer - AI Visualization & Dashboards

Mastercard; Howth; On-site; EUR 70,000 - 110,000; Full time

Job summary

Mastercard is seeking a Senior UI Developer to join an AI product team building interactive frontend experiences for embeddings and model outputs. You will design and maintain frontend applications across internal tooling and external self-service tools, integrating with the platform API and authentication layers.

You will work with AI engineers, data scientists, and software developers to deliver scalable, user-friendly interfaces, demonstrating strong UI/UX instincts and robust testing

Qualifications

• Strong, production-level frontend development experience in React and/or Python-based data-app frameworks (Streamlit or Dash).
• Component architecture, state management, and building maintainable, scalable apps.
• Experience integrating frontend with REST APIs including authentication, asynchronous job patterns, and API versioning.
• Familiarity with visualization libraries capable of advanced/interactive rendering (e.g., D3.js, Plotly, or similar).
• Experience with Databricks Apps hosting and how it serves React/Streamlit/Dash apps.

Responsibilities

• Design and build advanced, interactive visualization tooling for embeddings and model outputs.
• Develop self-service applications for end users, including job submission and status tracking via the platform API.
• Collaborate with AI/engineering teams to translate requirements into intuitive interfaces.
• Own frontend code quality, tests, and documentation to align with engineering standards.
• Support frontend production issues and coordinate with backend teams as needed.

Skills

React

Python (Streamlit or Dash)

REST APIs

Data visualization

UI/UX design

Databricks Apps

Tools

Databricks Apps

Plotly

D3.js

Job description

Mastercard is seeking a Senior UI Developer to join an AI product team building interactive frontend experiences for embeddings and model outputs. You will design and maintain frontend applications across internal tooling and external self-service tools, integrating with the platform API and authentication layers.

You will work with AI engineers, data scientists, and software developers to deliver scalable, user-friendly interfaces, demonstrating strong UI/UX instincts and robust testing