Senior Software Development Engineer
Mastercard•O'fallon, MO
•$115,000 - $184,000•Onsite
About The Position
The Senior Software Development Engineer is a senior individual contributor responsible for designing, developing, and supporting highly scalable distributed systems. This role combines deep technical expertise with mentorship responsibilities and ownership of critical software components from design through production support.
Requirements
- Strong hands-on experience with Java, Spring Boot, Kafka, REST APIs, JPA, and distributed systems.
- Strong understanding of software design and software architecture principles.
- Experience building highly scalable and resilient systems.
- Experience implementing automated testing strategies and quality engineering practices.
- Strong knowledge of performance engineering and production optimization.
- Strong understanding of secure software development principles.
- Experience leading code reviews and mentoring engineers.
- Strong troubleshooting and analytical problem-solving skills.
- Experience with microservices, cloud-native applications, and CI/CD.
- Experience building AI-assisted applications, autonomous agents, or agentic workflows.
- Agile Scrum experience.
Responsibilities
- Design software solutions and contribute to software architecture decisions that support scalability, maintainability, and operational excellence.
- Translate complex product requirements into technical designs and implementation plans.
- Lead development of modular, extensible, high-performance applications.
- Design and implement comprehensive unit, functional, and integration testing strategies.
- Analyze, optimize, and improve application performance, scalability, and reliability.
- Apply secure coding practices and promote application security best practices.
- Lead and participate in code reviews, ensuring adherence to engineering standards.
- Design systems with observability, operability, and supportability as core principles.
- Research emerging frameworks and technologies and recommend adoption where appropriate.
- Mentor junior developers and support onboarding activities.
- Troubleshoot and resolve complex production issues using root cause analysis techniques.
- Support engineering excellence through continuous improvement, refactoring, and adherence to SOLID principles.
Benefits
- insurance (including medical, prescription drug, dental, vision, disability, life insurance)
- flexible spending account and health savings account
- 16 weeks of new parent leave
- up to 20 days of bereavement leave
- 80 hours of Paid Sick and Safe Time
- 25 days of vacation time
- 5 personal days
- 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
Stand Out From the Crowd
Upload your resume and get instant feedback on how well it matches this job.
Upload and Match Resume
What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
No Education Listed
