Senior UI Engineer - AI Visualization & Dashboards

Mastercard; Blackrock; On-site; EUR 90,000 - 130,000; Full time

Job summary

Mastercard is seeking a Senior UI Developer to join an AI product team building foundation model capabilities. You’ll design and build frontend applications for internal tooling and external self-service tools, integrating with the platform’s API layer.

You will work with AI engineers, data scientists, and software developers to deliver interactive, high-quality UI experiences across multiple teams and audiences.

Qualifications

• Production-grade frontend experience with React and/or Python-based data apps (Streamlit or Dash).
• Strong component architecture and long-term maintainability.
• Experience integrating frontend with REST APIs, including auth and async job patterns.
• Experience with interactive visualization libraries (D3.js, deck.gl, Plotly, etc.).
• Familiarity with Databricks Apps hosting for React/Streamlit/Dash apps.
• Advanced data visualization with interactive, filterable interfaces.
• Ability to design for mixed technical audiences (AI engineers to product teams).
• Fluent in SQL and querying a governed data platform.
• Strong UI/UX instincts and independent design judgment.
• Proven testing and CI/CD workflow participation.
• Excellent written and verbal communication across teams.
• Comfort in a fast-moving, evolving environment.

Responsibilities

• Design and build frontend tooling for embeddings and model outputs with interactive visuals.
• Create self-service applications for end users with API integration and authentication.
• Prototype future product versions and executive demonstrations.
• Develop internal tooling to accelerate AI platform workstreams.
• Ensure frontend apps deploy on Databricks Apps with proper integration points.
• Collaborate with backend, data, and AI engineers on interface requirements.
• Maintain frontend code quality, testing, and documentation.
• Support production frontend issues and coordinate with backend when needed.

Skills

Frontend React development

Component architecture

REST API integration

Data visualization libraries

Databricks Apps hosting

Advanced data visualization

Cross-disciplinary collaboration

SQL querying

UI/UX instincts

Testing & CI/CD

Clear communication

Adaptability in fast-moving env

Education

Job description

Mastercard is seeking a Senior UI Developer to join an AI product team building foundation model capabilities. You’ll design and build frontend applications for internal tooling and external self-service tools, integrating with the platform’s API layer.

You will work with AI engineers, data scientists, and software developers to deliver interactive, high-quality UI experiences across multiple teams and audiences.