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Sr Software Test Engineer Jobs (NOW HIRING)

Danaher

Senior Software Test Engineer

Vista, CA · On-site

$130K - $140K/yr

The Senior Software Test Engineer is responsible for ensuring the quality, reliability, and performance of AI-driven digital pathology solutions. You will collaborate with cross-functional teams ...

MSD

Senior Software Test Engineer

Rockville, MD · On-site

$88K - $134K/yr

POSITION SUMMARY The Senior Software Test Engineer is responsible for the testing of major components of present and future MSD software products. While the current position is mostly remote ...

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Sr Software Test Engineer information

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$22.5K

$125.6K

$163.5K

How much do sr software test engineer jobs pay per year?

As of Sep 1, 2026, the average yearly pay for sr software test engineer in the United States is $125,561.00, according to ZipRecruiter salary data. Most workers in this role earn between $110,500.00 and $143,500.00 per year, depending on experience, location, and employer.

What does a Sr software test engineer do?

A Sr Software Test Engineer is responsible for designing, developing, and executing test plans to ensure the quality of software applications. They lead testing efforts, identify and document defects, and collaborate closely with developers and other stakeholders to resolve issues. Senior Test Engineers often mentor junior testers, help define testing strategies, and may also automate testing processes to improve efficiency. Their work ensures that software products meet functional and performance requirements before release.

What are some common challenges faced by a Sr software test engineer when working with cross-functional teams?

Sr Software Test Engineers often collaborate with development, product management, and operations teams to ensure product quality. One common challenge is aligning testing priorities with fast-paced development cycles, which requires strong communication and adaptability. Additionally, balancing the need for thorough testing with tight release schedules can be demanding. Building mutual understanding of testing goals and regularly syncing with other teams can help mitigate these challenges and promote efficient workflows.

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

To thrive as a Sr Software Test Engineer, you need expertise in software testing methodologies, strong analytical skills, and a bachelor's degree in computer science or a related field. Proficiency with test automation tools (such as Selenium or JUnit), defect tracking systems, and scripting languages is commonly required. Excellent problem-solving, attention to detail, and effective communication are standout soft skills in this role. These skills ensure thorough test coverage, rapid identification of defects, and seamless collaboration within development teams, leading to high-quality software releases.

What is the difference between Sr Software Test Engineer vs Software Test Engineer?

AspectSr Software Test EngineerSoftware Test Engineer
QualificationsBachelor's degree in CS or related field, experience in testing, sometimes certifications like ISTQBBachelor's degree in CS or related field, entry-level to mid-level testing experience
ResponsibilitiesDesigning test plans, leading testing efforts, mentoring juniors, analyzing complex issuesExecuting test cases, reporting bugs, basic test documentation
Work EnvironmentCollaborates with development teams, often in Agile settings, may lead testing projectsWorks under supervision, focuses on executing tests and reporting results

The main difference between a Sr Software Test Engineer and a Software Test Engineer lies in experience, responsibilities, and leadership. The senior role involves designing test strategies, mentoring, and handling complex issues, while the software test engineer primarily executes test cases and reports bugs. Both roles are essential in software quality assurance, but the senior position requires more experience and leadership skills.

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Sr Software Test Engineer jobs near you
Infographic showing various Sr Software Test Engineer job openings in the United States as of August 2026, with employment types broken down into 89% Full Time, 8% Part Time, and 3% Contract. Highlights an 88% Physical, 3% Hybrid, and 9% Remote job distribution, with an average salary of $125,561 per year, or $60.4 per hour.

Senior Software Test Engineer

Two Six Technologies

Arlington, VA

$127K - $165K/yr

Full-time

Re-posted 29 days ago

Job description

Overview of Opportunity 

At Two Six Technologies, we build, deploy, and implement innovative products that solve the world's most complex challenges today.

We are seeking a Senior Software Test Engineer to join our team. In this role, you will be responsible for developing and executing comprehensive manual functional and user-acceptance tests to assess software product quality. However, your work will extend beyond isolated software testing to include evaluating how custom applications, distributed architectures, and interoperable non-kinetic data streams function as a unified ecosystem. As our testing practices evolve, you will assist in implementing automated testing frameworks to scale these efforts. Additionally, you will contribute to new testing strategies aimed at verifying AI-assisted code development, ensuring the robustness and integrity of our software ecosystem.

You will collaborate closely with program engineering, development, and field operations teams to establish testing processes, evaluate complex features, and isolate critical defects. You will play a vital role in ensuring mission readiness, validating intricate data flows across multiple disparate networks, and aligning the entire test life cycle directly with strategic operational timelines.

Location: This role is expected to be on-site at TST's Arlington headquarters 4-5 days per week.

Responsibilities:

  • Perform full-stack system testing via API endpoints, hardware interfaces, and diagnostic tooling to isolate and investigate the root causes of complex technical problems.
  • Develop functional, end-to-end, regression, and performance tests that validate the seamless integration of software with physical hardware components.
  • Evaluate how hardware endpoints, distributed architectures, and interoperable data streams function together as a unified, mission-ready ecosystem.
  • Design and maintain the testing environment to ensure that hardware and software configurations accurately mirror operational deployments.
  • Assist in the progressive rollout and implementation of automated testing frameworks to scale existing manual integration efforts.
  • Design and implement testing strategies to verify the quality, robustness, and integrity of AI-assisted code development.
  • Detect, document, and track system-level defect reports and feature requests. 
  • Operational Schedule Integration: Trace and align test lifecycles with unified program milestones managed in the program schedule, ensuring testing velocities support the broader customer vision, strategic intent, and the Pilot timeline.

Minimum Qualifications:

  • 5+ years of systems testing experience, with a proven track record of automating tests for software-hardware interfaces, API endpoints, or embedded systems (e.g., using Python, Bash, or similar).
  • 3+ years of experience in system-level integration testing, focusing on backend API endpoints and validating complex hardware/software ecosystems. 
  • Solid understanding of networking concepts, distributed systems, and cross-network data flows.
  • Experience with UNIX / LINUX-based operating systems.
  • Experience with SQL or other relational/non-relational database technologies.
  • Familiarity with or a strong interest in modern development workflows that use AI-assisted coding tools and methods for verifying code integrity. 
  • Experience testing complex, data-heavy systems or interoperable data streams. 
  • Solid grasp of technical writing and documentation.
  • Bachelor's degree in a relevant field, or comparable professional experience.

Nice If You Have: 

  • Military cyber experience, networking experience, or understanding of common military, cyber, and networking vernacular.
  • Familiarity with AI development and testing capabilities.
  • Familiarity with virtualization or cloud technologies such as Docker, vSphere, Ansible, or AWS.
  • Understanding of the Agile Software Development Life Cycle.
  • Experience refining low-level testing or configuration scripts using Bash, Python, or JavaScript.
  • Experience with creating automated tests for geospatial libraries such as OpenLayers and CesiumJS.

Clearance Qualifications:

  • Eligible to obtain and maintain a TS/SCI security clearance.

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