Mastercard
Software Engineer II
O'Fallon, Missouri, USA · Mid · Part-time
Stay score
odds of building a lasting career here
Sponsors, but it's cap-subject — you still face the weighted lottery (~30% per draw at Level II). Good if you win; have a cap-exempt backup on your list.
Lottery odds assume a STEM candidate.
Personalize to your clock →H-1B wage level
the lottery is wage-weighted — each level is one more entry
$13,310 more — $105,310 — moves this role to Level II and 2 lottery entries. That figure is inside the range the employer already advertised.
Based on the DOL prevailing wage for this occupation and worksite, a base salary of $105,310 would place this position at wage Level II. That figure is within the posted range, and I'd like to target it. This role classifies under "Software Developers" for prevailing-wage purposes.
DOL prevailing wage, 2026-27 wage year · Software Developers (15-1252) · St. Louis, MO-IL. Wage level is derived by USCIS from the offered wage, occupation and worksite; the occupation shown is inferred from the job title.
Employer immigration record
from this employer's Department of Labor filings
Green-card filing pattern in this occupation
Green-card follow-through: 100%
Files H-1B transfers
Sourced from Department of Labor LCA, PERM and prevailing-wage disclosure data. Employer matching is by name, so figures may be split across an employer's legal entities. Absence of a filing means none appears in our copy of the data, not that none exists.
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About the role
- Analyze application behavior and identify opportunities to improve system performance, scalability, and reliability.
- Investigate performance bottlenecks and contribute to tuning and optimization efforts within supported applications.
- Participate in peer code reviews, providing constructive feedback to improve code quality, maintainability, security, and adherence to engineering standards.
Responsibilities
- 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.
- Apply software design principles to create maintainable, scalable, and efficient solutions for moderately complex business and technical challenges.
- Complete detailed technical design activities for assigned features, ensuring alignment with established architectural standards and development practices.
- Contribute to system architecture discussions and support implementation of architectural patterns that promote scalability, performance, maintainability, and operational reliability.
- Develop solutions with operational readiness in mind, including observability, monitoring, troubleshooting, and supportability considerations.
- Collaborate with team members to improve system resiliency and production stability.
- Design, develop, and maintain comprehensive unit, functional, and integration tests to validate application behavior and ensure software quality.
- Support continuous integration and deployment practices through automated testing and quality validation.
- Apply secure coding practices to develop software that minimizes vulnerabilities and adheres to organizational security standards.
Skills
- Utilize analytical and problem-solving skills to identify, diagnose, and resolve application and system issues.
Compensation
- In line with Mastercard's total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions dependi
Company info
- We are hiring a Software Engineer II to join Mastercard's Core Payments department, responsible for delivering solutions that facilitate billions of secure transactions between issuers, acquirers, and service providers worldwide.
- Together with our customers, we're helping build a sustainable economy where everyone can prosper.
This listing is sourced directly from Mastercard's careers page and normalized into a canonical job model.