Lead Software Engineer - Java/Python/Go

Mastercard; Blanchardstown; On-site; EUR 110,000 - 150,000; Full time

Job summary

Mastercard is seeking a Lead Software Engineer to modernize platforms, focusing on Fraud Rules/Engines and large-scale migrations. The role requires collaborative leadership and hands-on coding across Go, Python, and Java.

You will mentor teams, shape architectural decisions, and drive PoC initiatives in a fast-paced, security-conscious environment. The ideal candidate brings 8+ years of software and microservices experience and a track record of delivering scalable systems.

Qualifications

• 8+ years in software development and microservices architecture.
• Experience with Go, Python, Java and multiple frameworks.
• Lead large-scale migrations and fraud rule engines.
• Strong communication and leadership abilities.

Responsibilities

• Lead modernization of platforms, especially Fraud Rules/Engines.
• Collaborate with cross-functional teams and provide technical leadership.
• Ensure designs align with security, compliance, and architecture standards.
• Mentor development teams and drive PoC and pilots.

Skills

Go

Python

Java

Microservices

Leadership

Education

Bachelor's degree in Information Technology

Tools

Gen AI

LLMs

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

Lead Software Engineer - Java/Python/Go

Overview: Who is Mastercard? Mastercard is a global technology company in the payments industry. Our mission is to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential. Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. With connections across more than 210 countries and territories, we are building a sustainable world that unlocks priceless possibilities for all.

Role

• Lead the modernization of platforms especially related to Fraud Rules/Engines and proven experience in large-scale migrations
• Collaborate, influence and work with cross functional teams to understand the requirements, identify solutions and provide technical thought leadership
• Ensure project implementation(s) are compliant with solution architectural design, established architectural patterns (where applicable), policies, standards, and best practices
• Ensure that solution architectural designs are aligned with business needs, infrastructure capabilities, and security & compliance requirements
• Drive a culture of engineering excellence - Leading software development projects, especially at an early stage(PoC, Pilot)
• Assist with project scoping, sizing, prioritizing, planning, and estimation
• Mentor development team on industry best practices
• Familiarity with AI technologies like Gen AI, LLMs relevant to Fraud Rules
• Hands on experience implementing design patterns and using multiple programming languages.
• Experience building and operating scalable global platforms with highthroughput, low latency with 5 9's availability

All About You

• Minimum bachelor's degree in information technology, Computer Science or extensive work experience.
• Can write high quality, secure and clean code in multiple programming languages (e.g., Go, Python, Java)
• Hands-on Software development experience. 8+ years in Software and micro-services architecture. Familiar with dev ops and IT Operations best practices.
• Strategic Leader who has expertise with Fraud Rule Engines and proven experience in large-scale migrations
• Be a bar raiser with working experience across a variety of languages and frameworks, love declarative paradigm and functional programming
• Hands-on technical leader who consistently demonstratesleadership,builds trust, focuses on talent development and inspires the team.
• Must be high-energy, detail-oriented and proactive with the ability to function under pressure in an independent environment.
• Have a passion for continuous learning and enjoy challenging opportunities.
• Strong communication skills - both verbal and written - with strong relationship building, collaborative skills and organizational skills.
• Drives outcomes through strong commitment to timely delivery of key objectives.
• Have strong decision-making skills, lead retrospection and continually improve as a result.
• Must have expert level knowledge of software development processes and be an experienced user of one or more Application Lifecycle Management tools.
• Financial Domain preferable Banking Domain
• Current understanding of best practices regarding application & system security
• Success with producing high quality project design deliverables and documentation
• Extensive experience with databases: Relational & NoSQL
• Understanding of loosely coupled and stateless systems
• Demonstrated track record with highly scalable, distributed systems
• Familiarity with performance tuning, designing for failure & automation

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.