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Senior Software Development Engineer In Test Jobs in Saint Louis, MO

Staffing the Universe

Sr SDET - STL,MO

Saint Louis, MO · On-site

$48.50 - $62.75/hr

Sr SDET(QE) - 2 Positions - New Only fulltime STL, MO Excellent communication skills, verbal and written; able to communicate with technical people as well as management and business Has a broad ...

New

Staffing the Universe

Sr SDET - STL,MO

Saint Louis, MO · On-site

$48.50 - $62.75/hr

Sr SDET(QE) - 2 Positions - New Only fulltime STL, MO Excellent communication skills, verbal and written; able to communicate with technical people as well as management and business Has a broad ...

New

VRProIT

Java - SDET

Saint Louis, MO

Title: Java - SDET Location: St Louis, MO Duration: 3 yrs SDET ROLE * Let me be very clear here - these are NOT traditional QA roles. I.e. Selenium-only or QTP/UFT-only guys who are QA Engineers.

VRProIT

Java - SDET

Saint Louis, MO · On-site +1

Java - SDET Location: St Louis, MO Duration: 3 yrs SDET ROLE * Let me be very clear here - these are NOT traditional QA roles. I.e. Selenium-only or QTP/UFT-only guys who are QA Engineers. Instead, I ...

Know Ink, LLC

Quality Engineer

Saint Louis, MO · On-site

$67K - $87K/yr

SDET - Software Development Engineer in Test KNOWiNK -- St. Louis, Missouri (An On-site Role) At KNOWiNK, we build technology that powers elections across the country. That means quality isn't just a ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

In this role, you will contribute to software architecture decisions, drive technical design ... development of modular, extensible, high-performance applications. • Design and implement ...

InterSources Inc

QA Test Engineer

Chesterfield, MO · On-site

$40.75 - $55.75/hr

Responsibilities : • 3+ years in QA automation or SDET-type work (adjust by level); 1+ year exposure to AI/LLM or ML-driven features is a plus. • Strong test automation in Python and/or Java ...

MasterCard

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

You'll play a key role in advancing engineering excellence through secure development practices ... Role Design, build, test, deploy, and maintain scalable, cloud-native applications and ...

Stereotaxis

Senior Software Engineer

Saint Louis, MO · On-site

$119K - $157K/yr

This role will design, develop, document, and test software written in the C++ language using ... development of medical devices preferred • Working knowledge of OpenGL and 3D software ...

The Timberline Group

Senior Software Engineer

Saint Louis, MO · On-site +1

$119K - $157K/yr

Design, implement, review, test, debug, and document high-quality software * Discuss, review and ... Efficiently identify, prioritize and complete tasks in agile scrum software development life cycle

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Senior Software Development Engineer In Test information

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$21.1K

$117.6K

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How much do senior software development engineer in test jobs pay per year?

As of Sep 1, 2026, the average yearly pay for senior software development engineer in test in Saint Louis, MO is $117,556.00, according to ZipRecruiter salary data. Most workers in this role earn between $103,500.00 and $134,400.00 per year, depending on experience, location, and employer.

What does a senior software development engineer in test do?

A Senior Software Development Engineer in Test (SDET) is responsible for designing, developing, and maintaining automated test frameworks and tools to ensure the quality and reliability of software products. They work closely with development and QA teams to identify test requirements, create robust test cases, and integrate automated tests into the CI/CD pipeline. In addition to coding and scripting, Senior SDETs mentor junior team members, analyze test results, and help troubleshoot complex issues to continuously improve software quality. Their expertise bridges the gap between development and testing, ensuring both speed and quality in software releases.

How does a senior software development engineer in test typically collaborate with development and product teams to ensure software quality?

As a Senior Software Development Engineer In Test (SDET), you will work closely with both development and product teams throughout the software development lifecycle. This includes participating in design and requirements discussions to identify potential test cases early, contributing to test automation strategies, and providing feedback on testability and quality risks. SDETs often pair with developers to review code, co-create test plans, and triage bugs together, ensuring that testing is fully integrated into the CI/CD pipeline. Effective communication and cross-team collaboration are essential for proactively identifying issues and maintaining high software quality standards.

What are the key skills and qualifications needed to thrive as a senior software development engineer in test, and why are they important?

To thrive as a Senior Software Development Engineer In Test, you need advanced programming skills, deep knowledge of software testing methodologies, and a bachelor's degree in computer science or a related field. Expertise with automation frameworks (such as Selenium, Cypress, or Appium), CI/CD tools, and scripting languages is typically required, along with relevant certifications like ISTQB. Strong analytical thinking, problem-solving, and effective communication are crucial soft skills for collaborating with cross-functional teams and driving quality initiatives. These capabilities ensure rigorous test coverage, faster release cycles, and high-quality software products.

What is the difference between Senior Software Development Engineer In Test vs Software Development Engineer In Test?

AspectSenior Software Development Engineer In TestSoftware Development Engineer In Test
ExperienceTypically 5+ years in testing and developmentEntry to mid-level, 1-3 years experience
ResponsibilitiesDesigns complex test frameworks, mentors juniors, leads testing initiativesDevelops test cases, automates tests, executes testing tasks
Skills & CertificationsAdvanced coding, automation, testing tools, leadership skillsProgramming, automation, testing tools
Work EnvironmentCollaborates with cross-functional teams, often in Agile settingsWorks closely with developers, focuses on automation and manual testing

In summary, a Senior Software Development Engineer In Test has more experience, leadership responsibilities, and strategic testing roles compared to a Software Development Engineer In Test, who primarily focuses on developing and executing tests.

What are the most commonly searched types of Software Development Engineer In Test jobs in Saint Louis, MO?

The most popular types of Software Development Engineer In Test jobs in Saint Louis, MO are:

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For Senior Software Development Engineer In Test jobs in Saint Louis, MO, the most frequently searched job titles are:

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Senior Software Development Engineer In Test jobs near you

Senior Software Development Engineer in Test (SDET)

London Stock Exchange Group

Saint Louis, MO • On-site

$104K - $136K/yr

Other

Medical, Retirement

Posted 13 days ago

Job description

Job Description
SDET Engineers are involved in requirements analysis, test planning, writing test cases/scripts, test case automation, and execution of all testing (which may include application integration, system, system/network integration, performance testing and acceptance testing) required to ensure that the software is of the highest quality. After the project is released to production, these teammates are also involved to providing support to our internal customer, the technical operation group as well as service management. Besides, this role also plays a significant part of internal process audit and improvement to build efficiencies.
Main Responsibilities / Accountabilities:
  • Design, develop, and maintain scalable automated test solutions and frameworks using Python.
  • Build and implement automated tests for CLI, UI, API, integration, and end-to-end validation.
  • Collaborate with Product Owners, Business Analysts, Developers, and other team members to understand requirements and develop effective test strategies and test cases.
  • Drive Quality Engineering standard methodologies throughout the software development lifecycle.
  • Participate in test planning, test design, estimation, execution, and release activities within Agile teams.
  • Implement functional, integration, and regression testing across multiple platforms, including Linux and Windows environments.
  • Identify, document, prioritize, and supervise defects through resolution while performing root cause analysis.
  • Integrate automated tests into CI/CD pipelines to support continuous testing and rapid feedback cycles.
  • Perform API testing and data validation to ensure application reliability, accuracy, and consistency.
  • Work closely with globally distributed teams, ensuring effective collaboration across time zones and functions.
  • Use test management tools to run test execution, traceability, reporting, and quality metrics.
  • Support and ability to lead continuous improvement initiatives by evaluating and accepting modern testing tools, frameworks, and engineering practices.
Essential Skills & Experience
  • Experienced level in Quality Engineering, Test Automation, or SDET roles.
  • Work independently within defined parameters, taking ownership of problems within own area of knowledge.
  • Strong programming expertise in Python with experience developing reusable automation frameworks.
  • Experience implementing Behavior Driven Development (BDD) practices using Robot Framework and Gherkin/Cucumber.
  • Strong understanding of software testing methodologies, test build techniques, and Quality Engineering principles.
  • Hands-on experience integrating automated testing into CI/CD pipelines.
  • Proficiency with source code management tools such as GitLab, Bitbucket, or Git.
  • Experience working with TestRail or similar test management platforms.
  • Strong experience working within Agile/Scrum development environments.
  • Experience testing applications on both Linux and Windows platforms.
  • Expertise in cloud-native technologies and platforms such as AWS or Azure.
  • Knowledge of containerization and orchestration technologies including Docker and Kubernetes.
  • Excellent analytical, debugging, and problem-solving skills.
  • Strong communication and collaboration skills with the ability to work effectively in a global environment.
  • Proficiency with Networking, TCP/IP
Desired Skills
  • Hands-on experience with UI automation frameworks, including Playwright and/or Selenium.
  • Familiarity with AI-assisted development platforms including GitHub Copilot, Claude, or similar platforms.
  • Experience with Infrastructure as Code (IaC) testing, including exposure to Terraform and Bash scripting.
  • Experience with Application Performance testing.
  • Experience testing APIs and validating backend data using SQL and other validation techniques.
  • Exposure to modern DevOps and cloud-native architectures.
  • Understanding of performance, scalability, and reliability testing concepts.
  • Experience mentoring team members and promoting Quality Engineering standards.
  • Ability to quickly learn and adopt new tools, technologies.
  • Relevant certifications in Cloud, DevOps, Agile, or Quality Engineering subject areas.
Career Stage:
Senior Associate
London Stock Exchange Group (LSEG) Information:
Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.
LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.
Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.
Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.
We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone's race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.
You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.
LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.
Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it's used for, and how it's obtained, your rights and how to contact us as a data subject .
If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.

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