Senior Software Test Engineer

Overview of Opportunity

At Two Six Technologies, we build, deploy, and implement innovative products that solve the world’s most complex challenges today. Through unrivaled collaboration and unwavering trust, we push the boundaries of what’s possible to empower our team and support our customers in building a safer global future.

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. Your work will also include evaluating how custom web applications, distributed architectures, and interoperable non‑kinetic data streams function as a unified ecosystem, assisting in implementing automated testing frameworks, and contributing to testing strategies that verify AI‑assisted code development.

Location:

The role is expected to be on–site at TST’s Arlington headquarters 4–5 days per week.

• Perform software product testing via website interactions and tooling to investigate possible causes of problems.
• Develop functional, end‑to‑end, regression, and performance tests in manual test environments.
• Evaluate how custom web applications, distributed architectures, and interoperable data streams function together as a unified ecosystem.
• Assist in the progressive rollout and implementation of automated testing frameworks to scale existing manual efforts.
• Contribute to the design of new testing strategies aimed at verifying the quality, robustness, and integrity of AI‑assisted code development.
• Detect, document, and track software defect reports and feature requests.
• Understand, reproduce, and troubleshoot product defects, collaborating closely with developers to determine the best resolution.
• Assist in the planning and implementation of testing‑team processes and solutions in alignment with program and operational timelines.

• 5+ years of software testing experience, with exposure to web automation tools (e.g., Selenium, Playwright, Cypress).
• 3+ years of experience with backend API testing, integration testing, and functional testing.
• 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 using 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.

• 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 Java script.
• Experience with creating automated tests for geospatial libraries such as Open Layers and CesiumJS.

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

Salary range: $96,700 - $140,000 USD annually. Benefits include medical, dental, vision, life and disability insurance, retirement, paid leave, tuition assistance, and professional development.

Two Six Technologies is an Equal Opportunity Employer and does not discriminate in employment opportunities or practices based on race, color, religion, national origin, sex, sexual orientation, gender identity or expression, age, marital status, disability, genetic information, or protected veteran status. For more information review the Two Six Technologies Equal Employment Opportunity and Aff­irmative Action Policy and the EEO Poster.

If you are an individual with a disability and would like to request reasonable workplace accommodation, please send an email to  Information provided will be kept confidential and used only to the extent required to provide needed reasonable accommodations.

Additionally, please be advised that this business uses E‑Verify in its hiring practices.