Lead Software Engineer

Mastercard • O’Fallon, MO

23h • $140,000 - $231,000

About The Position

We are looking for a Lead Engineer who is a hands-on full stack engineer responsible for leading design and development within a team or domain area. This role actively codes, drives high quality delivery, and provides technical guidance to the team while aligning with broader architectural direction set by Principal Engineers and Architects. The ideal candidate has experience building scalable services, modernizing legacy platforms, and contributing to GenAI enabled capabilities in an enterprise environment.

Requirements

• Bachelor’s degree in Computer Science or a related field, or equivalent practical experience
• Strong foundation in data structures, algorithms, and distributed system fundamentals
• 7 to 10 years of hands on experience building enterprise applications using Java, Spring Framework, REST based services, and batch processing frameworks such as Spring Batch
• Working experience with GenAI solutions, including LLM consumption, prompt design, retrieval augmented generation workflows, and embeddings
• Experience using managed LLM platforms such as Azure OpenAI or equivalent enterprise offerings
• Solid experience with relational databases, including Oracle SQL, PL SQL, data modeling, and query performance tuning
• Experience working in Agile delivery models such as Scrum or SAFe, with exposure to TDD or BDD practices
• Practical DevOps experience including CI CD pipelines, basic automation, logging, monitoring, and production support
• Experience operating and troubleshooting applications on Linux or UNIX environments
• Proven experience building reliable, scalable services within a larger distributed ecosystem
• Experience contributing to modernization initiatives of legacy systems
• Strong understanding of software design principles such as SOLID, separation of concerns, and clean code
• Good communication skills, able to clearly explain technical designs and tradeoffs within the team

Nice To Haves

• Exposure to cloud native platforms such as PCF, OpenShift, Azure, or similar environments is a plus

Responsibilities

• Build, enhance, and maintain secure, production grade software, writing clean, testable, and maintainable code
• Lead technical design and implementation for team owned services and components across the full stack
• Implement service APIs, data models, and integrations aligned with established platform architecture and standards
• Contribute to GenAI enabled features, including LLM integration, retrieval augmented generation patterns, embeddings, and vector stores, under guidance of broader architecture
• Drive modernization of legacy components within the team’s scope using approved architectural patterns
• Participate throughout the SDLC including design, development, code reviews, testing, documentation, deployment, and production support
• Own operational stability of assigned services, including monitoring, incident resolution, and root cause analysis
• Apply secure coding, privacy, and responsible AI practices in alignment with enterprise policies
• Mentor and support engineers through code reviews, design discussions, and day to day technical guidance
• Collaborate with product owners, platform teams, data teams, and security partners to deliver end to end solutions
• Continuously improve engineering practices, quality, and team level technical standards

Benefits

• insurance (including medical, prescription drug, dental, vision, disability, life insurance)
• flexible spending account and health savings account
• paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave)
• 80 hours of Paid Sick and Safe Time, 25 days of vacation time and 5 personal days, pro-rated based on date of hire
• 10 annual paid U.S. observed holidays
• 401k with a best-in-class company match
• deferred compensation for eligible roles
• fitness reimbursement or on-site fitness facilities
• eligibility for tuition reimbursement

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 5,001-10,000 employees