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Senior Software Development Engineer in Test; SDET

Job in St. Louis, Saint Louis, St. Louis city, Missouri, 63105, USA
Listing for: LSEG
Full Time position
Listed on 2026-08-24
Job specializations:
  • Software Development
    DevOps, Software Testing
Salary/Wage Range or Industry Benchmark: 100000 - 140000 USD Yearly USD 100000.00 140000.00 YEAR
Job Description & How to Apply Below
Position: Senior Software Development Engineer in Test (SDET)
Location: St. Louis

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 Git Lab, Bitbucket, or Git.
  • Experience working with Test Rail 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 Git Hub 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 Dev Ops 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, Dev Ops, 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…

Position Requirements
10+ Years work experience
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