Lead Software Engineer - Java/Python/Go

Mastercard; Celbridge; On-site; EUR 120,000 - 180,000; Full time

Job summary

Mastercard is seeking a Lead Software Engineer to drive modernization of fraud-related platforms. You will lead PoCs, coordinate with cross-functional teams, and guide architectural decisions across large-scale migrations.

The role requires hands-on development in Go, Python, and Java, with 8+ years in software and microservices. Security, compliance, and DevOps practices are essential to success.

Qualifications

• Bachelor’s degree in IT, CS or equivalent experience.
• Proficiency in Java, Python, Go and multiple languages.
• 8+ years in software development and microservices architecture.
• Experience with Fraud Rule Engines and large-scale migrations.
• Strong leadership, collaboration, and delivery capabilities.

Responsibilities

• Lead modernization of platforms related to Fraud Rules/Engines and migrations.
• Collaborate with cross-functional teams to define solutions and provide technical leadership.
• Ensure architecture, security, and compliance alignment across projects.
• Mentor teams and drive engineering excellence and PoC pilots.
• Experience with AI/GenAI concepts relevant to fraud detection.

Skills

Go

Python

Java

Distributed systems

Fraud rule engines

Leadership

DevOps

Performance tuning

Security practices

Communication

Education

Bachelor’s degree

Tools

ALM tools

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.
• Drivers 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

• 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.