Senior Software Engineer (MCP & RAG)

Mastercard Inc.; Ashbourne; On-site; EUR 120,000 - 170,000; Full time

Job summary

Mastercard Inc. is seeking a Senior Software Engineer to design scalable AI-powered solutions, focusing on MCP & RAG, across AWS, Cloudera, and Databricks. You will build knowledge bases, LLM-driven apps, and robust APIs, collaborating with product, engineering, and data teams.

Ideal candidates have 5–10 years in software engineering, strong Python, Angular, LangChain, and vector databases expertise, with a passion for secure, scalable architecture and mentoring juniors.

Qualifications

• 5–10 years in software engineering with a focus on AI/ML and distributed systems.
• Proficiency in Python for scalable backend systems.
• Experience with Angular or similar frontend frameworks for AI applications.
• Hands-on experience with LangChain and RAG-based architectures.
• Knowledge of vector databases (PGVector, GraphDB) and embedding models.
• Cloud platforms expertise, especially AWS; familiarity with Cloudera and Databricks.

Responsibilities

• Design, develop, and deliver AI-powered solutions using LLMs and retrieval-augmented generation (RAG).
• Build and maintain enterprise knowledge bases with vector search capabilities.
• Develop LLM-driven applications using LangChain and orchestration patterns.
• Architect scalable, secure solutions across AWS, Cloudera, and Databricks.
• Collaborate with product, engineering, and data teams to translate business needs into AI-enabled solutions.
• Maintain robust APIs and microservices for AI apps and front-end integration.
• Ensure compliance with data governance, security, and operational standards.
• Monitor model performance and optimize reliability in production.

Skills

Problem solving

Communication

Stakeholder management

Ownership

Continuous learning

Education

Bachelor's or Master's in CS/AI/Data Science

Tools

Python

LangChain

LLM frameworks

Vector search

AWS

Cloudera

Databricks

Docker

Kubernetes

Angular

APIs / microservices

MCP

PGVector

GraphDB

Job description

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Senior Software Engineer (MCP & RAG)

Overview

The Program Modernization team at MasterCard drives transformation and champions modernization across technology, risk, and service operations. We establish the foundation for scalable programs, resilient systems and control governance that empowers transformation.

The mission of the Technology Modernization team is to enable all the Mastercard programs across the organization to thrive in an evolving regulatory environment by fostering a culture of strong technology controls and effective execution. The team designs and delivers innovative, data-driven solutions that fulfill assurance obligations and regulatory requirements by proactively identifying risks, build real-time tools that leverage technology to continuously test and monitor the control environment. These capabilities enables audit-ready compliance portal for inventorying, managing, testing, and evidencing technology controls.

Mastercard is committed to driving innovation through advanced technologies and data-driven insights. We are seeking a Lead Engineer to design and deliver scalable, enterprise-grade AI solutions that enhance our digital capabilities and customer experiences.

This role will focus on building intelligent, production-ready systems leveraging large language models (LLMs), knowledge bases with vector search, and modern cloud/data platforms, while ensuring alignment with Mastercard's standards for security, performance, and reliability.

Role & Responsibilities

Design, develop, and deliver AI-powered solutions leveraging modern architectures, including LLM-based systems and retrieval-augmented generation (RAG)

Build and maintain enterprise knowledge bases with vector search capabilities, enabling semantic search and intelligent information retrieval

Develop LLM-driven applications using frameworks such as LangChain, including prompt engineering, chaining, and orchestration patterns

Implement and integrate solutions leveraging Model Context Protocols (MCP) or equivalent model interaction frameworks

Architect scalable and secure solutions across cloud and data ecosystems, including AWS, Cloudera, and Databricks

Collaborate cross-functionally with product, engineering, and data teams to translate business needs into AI-enabled solutions

Develop and maintain robust APIs and microservices to support AI applications and front-end integrations

Ensure solutions adhere to Mastercard's standards for data governance, security, compliance, and operational excellence

Monitor and optimize model performance, reliability, and scalability in production environments

Contribute to technical design discussions, mentor junior engineers, and promote engineering best practices

All About You

Proven experience (5 to 10 years) in software engineering, with strong focus on AI/ML and distributed systems

Bachelor's or Master's degree in Computer Science, Artificial Intelligence, Data Science, or a related discipline

Strong proficiency in Python, with experience building scalable backend systems

Experience with Angular or similar frontend frameworks for building user-facing AI applications

Hands-on experience with LLM frameworks (e.g., LangChain) and building RAG-based systems

Expertise in designing knowledge bases with vector search and working with embedding models

Strong experience with cloud platforms, particularly AWS, and familiarity with Cloudera and Databricks ecosystems

Solid understanding of system design, APIs, and microservices architecture

Preferred Skills

Experience with Model Context Protocol (MCP) or similar AI orchestration frameworks

Experience with vector databases such as PGVector, GraphDB

Familiarity with MLOps practices, including CI/CD pipelines, monitoring, and lifecycle management

Knowledge of containerization and orchestration (Docker, Kubernetes)

Experience working in highly regulated, large-scale enterprise environments

Key Competencies

Strong problem-solving and analytical thinking

Ability to operate effectively in a collaborative, fast-paced environment

Excellent communication and stakeholder engagement skills

Demonstrated ownership and accountability for end-to-end delivery

Commitment to continuous learning and staying current with emerging AI technologies

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks must comply with Mastercard's security policies and standards. Employees are responsible for maintaining the confidentiality, integrity, and availability of information.

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

• Abide by Mastercard's security policies and practices;

• Ensure the confidentiality and integrity of the information being accessed;

• Report any suspected information security violation or breach, and

• Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.