Sign up to access all features of our service.
  • Job search
  • Favorites
  • Create a CV
    New
  • Salaries
  • Subscriptions

Lead Software Development Engineer in Test (Lead SDET)

$140k - $231k
Full-time

Mastercard

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 Development Engineer in Test (Lead SDET)

Overview:
Mastercard’s Global Credit Card Authorization team is seeking a Lead Software Development Engineer in Test (Lead SDET) to drive quality engineering for one of the most critical transaction processing platforms in the world. This platform facilitates billions of transactions annually between issuers, acquirers, and service providers across the globe.
In this role, you will combine deep technical expertise with leadership to define and scale testing strategies for complex, high-throughput systems. You will play a pivotal role in elevating engineering standards, strengthening production readiness, and embedding quality across the entire software development lifecycle. You will also mentor engineers and influence quality practices across teams.
This is a hybrid role based in O’Fallon, MO, with an expectation of three days per week onsite.

Role:
• Lead development of complex system components in C and design corresponding unit tests in C++ using Google Test.
• Translate high-level design documents and system architecture into detailed, actionable test plans and validation strategies.
• Design, implement, and execute functional, integration, and User Acceptance Testing (UAT) strategies across the platform.
• Own end-to-end quality outcomes for key authorization services, ensuring high performance, resilience, and reliability.
• Review system traces, logs, and runtime behavior to ensure comprehensive test coverage and system validation.
• Lead root cause analysis for complex issues, driving resolution and preventing recurrence.
• Identify, prioritize, and remove testing blockers to ensure timely and high-quality release delivery.
• Ensure production readiness by proactively identifying risks, validating fixes, and resolving defects prior to deployment.
• Drive continuous improvement in test automation, quality engineering practices, and CI/CD integration.
• Collaborate across engineering, product, and operations teams in a fast-paced, global environment to align on quality standards.
• Guide and mentor SDETs and QA engineers, fostering a culture of accountability, ownership, and continuous improvement.
• Champion high-confidence releases by embedding quality early in the development lifecycle and improving platform-wide testing strategies.

All About You:
• Extensive experience as a Software Development Engineer in Test (SDET), Quality Engineer, or similar role in large-scale, high-availability systems.
• Strong proficiency in C/C++ with hands-on software development experience for test development and system validation.
• Experience designing and implementing automated test frameworks and scalable testing strategies.
• Proven ability to develop and execute functional, integration, and User Acceptance Testing (UAT) for complex systems.
• Ability to translate high-level design and architecture documents into detailed, actionable test plans.
• Strong understanding of software quality engineering practices, defect lifecycle management, and test coverage methodologies.
• Experience working in Linux/Unix environments.
• Proficiency in scripting languages, preferably shell scripting, for automation and test execution.
• Experience with CI/CD pipelines, automated testing tools, and modern DevOps practices.
• Strong experience using source control systems (Git preferred) in collaborative development environments.
• Deep understanding of distributed systems, high-throughput architectures, and performance considerations.
• Strong analytical and problem-solving skills with a focus on root cause analysis and defect prevention.
• Proven ability to lead testing efforts and influence quality strategy across teams or domains.
• Excellent communication and stakeholder management skills, with the ability to influence both technical and non-technical audiences.
• Experience mentoring or leading engineers is strongly preferred.
• Bachelor’s degree in Computer Science, Engineering, Mathematics, or a related technical field (or equivalent practical experience)

This role is not eligible for Mastercard’s work authorization sponsorship. As such, candidates must be eligible to work in the United States, now as well as in the future, without employer sponsorship.

Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact View email address on decentrajobs.com and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.

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.

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 depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: 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; and many more. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.

Pay Ranges

O'Fallon, Missouri: $140,000 - $231,000 USD

Vacancy posted a month ago
Similar jobs that could be interesting for youBased on the Lead Software Development Engineer in Test (Lead SDET) in O Fallon, MO vacancy
  •  ...Lead SDET Engineer Location: O’Fallon MO Need strong Testng, Selenium, Java Coding experience Job Description: Must...  ...Master or 8+ years with Bachelors of hand on experience in software development in test automation, concurrent coding skills in Java. Test... 
    Suggested

    Argyle Infotech

    O Fallon, MO
    4 days ago
  •  ...Software Engineer II (Testing) As a Software Engineer II (Testing), you are a key player on the development team inside of Data & Services Technology. You will apply your broad knowledge...  ...web software technologies to build leading-edge easy-to-use web interfaces and... 
    Suggested
    Flexible hours

    Samprasoft

    O Fallon, MO
    18 hours ago
  •  ...Test Lead Location: OFALLON, Missouri Duration: 12 Months Description 6+ years...  ...Experience of working in an Agile and SAFE development methodology using ALM. Full...  ...communication skills, written and verbal ISEB/ISTQB Foundation Certificate in Software Testing.... 
    Suggested

    Keylent Inc

    O Fallon, MO
    4 days ago
  •  ...Java SDET Location: OFALLON Skill: rest,Selenium,POSTMAN Note: Day 1 Onsite (Not Remote) Java SDET (Software Development Engineer in Test) Skillsets: Java, Postman, JUnit, SOAP UI Pro, JBehave...  ...experience to play the role of test lead, leading and guiding a 5-7... 
    Suggested

    Keylent Inc

    O Fallon, MO
    2 days ago
  •  ...SDET with UI Testing Hybrid (3 days in office) Location - O'Fallon, MO (Only local No...  ...genuine SDET +UI testing Must have java development exp. Candidates with proper...  ...Minimum 9 years of experience in software testing and automation. Strong hands... 
    Suggested
    Work at office
    Local area
    Remote work
    Relocation

    Damco Solutions

    O Fallon, MO
    18 hours ago
  •  ...Senior Java Developer Senior position (minimum of 5+ years in Java and testing) Should be good in testing concepts We are expecting advanced knowledge in Core Java Test Automation skills (REST Assured, Postman) We use Oracle so Oracle knowledge would be... 

    Samprasoft

    O Fallon, MO
    18 hours ago
  • $500 per month

     ...Professional Game Tester We're looking for passionate gamers to join our elite team of mobile game testers. Get paid to play and test the latest games before they launch. $500+ Avg Monthly Pay 5-10 Hours/Week 100% Remote Position Requirements: Must... 
    Remote work
    10 hours per week

    Babki

    O Fallon, MO
    4 days ago
  •  ...and platforms responsibilities. Works closely with software engineers to build quality by ensuring proper test and code coverage, configuration quality,...  ...or more application codebases and alignment with development standard. Building automation frameworks, acceptance... 

    Samprasoft

    O Fallon, MO
    18 hours ago
  •  ...Senior SDET Engineer Location: O’Fallon MO – Day 1 Onsite – No Remote Duration...  ...Key Skills and Experience: Hands on Java/Rest API testing experience Test automation, Ops gating, Integration Testing Rest Assured and Framework development experience.... 
    Long term contract
    Remote work

    Argyle Infotech

    O Fallon, MO
    4 days ago
  • $92k - $147k

     ...services that help people, businesses and governments realize their greatest potential. Title and Summary Software Development Engineer in Test (SDET) II Overview: Mastercard's Global Credit Card Authorization team is seeking a Software Development Engineer... 
    Full time
    Part time
    Worldwide
    Flexible hours
    3 days per week

    Mastercard

    O Fallon, MO
    a month ago
  •  ...Site Reliability Engineer The BizOps team is looking for a Site...  ...build our CI/CD pipeline and lead Mastercard in DevOps automation...  ...& standards throughout the development, quality, release, and product...  ...CI/CD pipeline for promoting software into higher environments through... 
    Shift work

    Samprasoft

    O Fallon, MO
    18 hours ago
  •  ...Systems Analysts and Quality Engineers in a behavioural driven development environment. • The...  ...tasks (design, develop, test, deploy, configure, document...  ..., and run aspects of software • Drive code/design/process...  ...g. velocity, throughput, lead time, burndown) •... 

    3B Staffing LLC

    O Fallon, MO
    4 days ago
  •  ...Lead Mainframe Developer Location: O'Fallon, MO OnSite Full Time Permanent & Contract Product: Hogan suite (UMB,CIS,CAMS etc.) Must Have Experience in L2 and L3 Maintenance, Support and Compliances COBOL, VSAM, JCL, DB2, Assembler 1. Working experience... 
    Permanent employment
    Full time
    Contract work
    Work experience placement

    Georgia IT Inc

    O Fallon, MO
    4 days ago
  • $140k - $231k

     ...greatest potential. Title and Summary Lead Software Engineer Overview Mastercard is a global...  ...scalability challenges Software Development Excellence •Own delivery of robust,...  ...and operational insights Testing Strategy & Quality Engineering • Define... 
    Full time
    Part time
    Worldwide
    Flexible hours

    MasterCard

    O Fallon, MO
    2 days ago
  •  ...Lead Software Engineer O'Fallon, Missouri Job Type: Contract Job Description Summary:...  ...initiatives by contributing to solution development and improvements for existing products...  ...requirements documents, design specifications, test plans, and deployment strategies.... 
    Contract work

    w3r Consulting

    O Fallon, MO
    4 days ago
  •  ...Lead Software Engineer Job Description: Overview: As part of an exciting, fast paced environment developing digital identity and security...  ...this position will provide technical expertise within the development lifecycle for new products and services. Digital Identity:... 

    Omega Solutions Inc

    O Fallon, MO
    4 days ago
  •  ...Job Title: Lead BizOps Engineer Overview: Job Description: Overview Who is Mastercard...  ...during the application build phase in software run principals that includes...  ...Operations team is to engage early in the development lifecycle to be more proactive and upfront... 
    Flexible hours

    MasterCard

    O Fallon, MO
    1 day ago
  •  ...Lead Software Development Engineer Mastercard’s Commercial Solutions team is a rapidly growing organization with responsibilities to deliver innovative...  ...quality using approaches such as unit and end to end testing. Deep knowledge of Continuous Integration and... 
    H1b
    Local area
    Relocation

    Samprasoft

    O Fallon, MO
    18 hours ago
  •  ...Lead Software Development Engineer Location: O’Fallon, MO Duration: 24 months Interview process: First round phone, second round skype video...  ...Manage and develop system integration and functional testing strategies and subsequent supporting tests plans and cases... 

    My3Tech Inc

    O Fallon, MO
    4 days ago
  •  ...& Technology Fraud Products Team Lead Be part of the Operations & Technology...  ...to ensure effective delivery of software capabilities and be an integral...  ...team. Knowledge of software development processes including agile processes and test driven development Essential... 
    Local area
    Remote work
    Relocation

    Samprasoft

    O Fallon, MO
    18 hours ago
  • $100k

     ...Automation Test Engineer Full time/ Day 1 Onsite - OFL, MO Java, Selenium, Cucumber, Postman, Jmeter $100k/Yr Possesses a strong knowledge of programming, tools, architecture patterns, and BDD Develops/monitors quality gating and automation strategy for a... 
    Full time
    Contract work

    Zortech Solutions

    O Fallon, MO
    4 days ago
  • $500 per week

     ...minutes each session. Compensation varies per study. Please complete your profile to view projects available to you. Notes on Product Testing: - Each product test is conducted by a third party, independent company. - There is no cost to use our service. Any costs are... 
    Remote work

    Product Review Jobs

    O Fallon, MO
    3 days ago
  • Barnes-Jewish St. Peters Hospital is seeking a Charge Radiology Technician to perform diagnostic imaging procedures and manage workflow in a supportive team setting. The role requires strong problem-solving abilities, a customer service focus, and a commitment to patient...
    Afternoon shift

    Direct Jobs

    Saint Peters, MO
    1 day ago
  • A defense contractor is seeking a Software Engineering Lead for a Department of Defense client at Scott Air Force Base in O'Fallon, IL. The role involves supporting software development and Agile processes, coordinating development activities, and assisting with tool configuration... 
    For contractors

    Anaesthesia Associates of Massachusetts, P.C.

    O Fallon, MO
    1 day ago
  • Overview Amyx is seeking a Software Engineering Lead to join our Dept. of Defense client at Scott Air...  ...the ability to support software development and Agile delivery activities. Supports...  ...Coordinates software development support and testing activities. Assists with tool... 
    Temporary work
    For contractors
    Flexible hours

    Anaesthesia Associates of Massachusetts, P.C.

    O Fallon, MO
    1 day ago
  •  ...Consultant Software Engineer Been the victim of credit card fraud and...  ...credit card fraud. Our industry-leading bastion of defense processes...  ...for modest advanced code development, code review and day-to-day...  ...development and acceptance testing Chart out development strategy... 

    Samprasoft

    O Fallon, MO
    18 hours ago
  • $45 per hour

     ...of between $25/hr. and $45/hr., depending on the In-Home Usage Test project. No experience required. There is no payment required in...  ...firm that specializes in product testing and product development work. We design and conduct In-Home Usage Testing (IHUT) locally... 
    Hourly pay
    Weekly pay
    Extra income
    Temporary work
    Part time
    For contractors
    Seasonal work
    Remote work
    Work from home
    Flexible hours

    Great Lion

    Saint Peters, MO
    3 days ago
  •  ...Lead AI Software Engineer- AI Enablement The Mastercard Cloud Team, in Mastercard's ONE division, owns and drives cloud usage and adoption...  ...of technology at Mastercard and help shape the future of development, deployment and more! This cloud engineering role is focused... 

    Dynamic Yield

    O Fallon, MO
    4 days ago
  • $25 - $45 per hour

     ...experience is required, making this an ideal position for those looking for flexible work arrangements. Testers will need to document their testing process as per provided schedules, maintain product care, and participate in various market research tasks. Candidates must be 18... 
    Remote job
    Hourly pay
    Work from home
    Flexible hours

    Great Lion

    Saint Peters, MO
    3 days ago
  • $122k - $207k

     ...potential. Title and Summary Lead Site Reliability Engineer Who is Mastercard? At Mastercard...  ...during the application build phase in software run principles that include...  ...Operations team is to engage early in the development lifecycle to be more proactive and upfront... 
    Full time
    Part time
    Worldwide
    Flexible hours

    MasterCard

    O Fallon, MO
    2 days ago

Do you want to receive more vacancies?

Subscribe and receive similar vacancies to Lead Software Development Engineer in Test (Lead SDET). Be the first to apply!