Senior Software Test Engineer

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. 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. #LI-MS1 Two Six Technologies is committed to providing competitive and comprehensive compensation packages that reflect the value we place on our employees and their contributions. We believe in rewarding skills, experience, and performance. Our offerings include but are not limited to, medical, dental, and vision insurance, life and disability insurance, retirement benefits, paid leave, tuition assistance and professional development. The projected salary range listed for this position is annualized. This is a general guideline and not a guarantee of salary. Salary is one component of our total compensation package and the specific salary offered is determined by various factors, including, but not limited to education, experience, knowledge, skills, geographic location, as well as contract specific affordability and organizational requirements. Salary Range $100,000—$140,000 USD Two Six Technologies is an Equal Opportunity Employer and does not discriminate in employment opportunities or practices based on race (including traits historically associated with race, such as hair texture, hair type and protective hair styles (e.g., braids, twists, locs and twists)), color, religion, national origin, sex (including pregnancy, childbirth or related medical conditions and lactation), sexual orientation, gender identity or expression, age (40 and over), marital status, disability, genetic information, and protected veteran status or any other characteristic protected by applicable federal, state, or local law. For more information review the Two Six Technologies Equal Employment Opportunity and the EEO Poster. If you are an individual with a disability and would like to request reasonable workplaceaccommodation for any part of our employment process, please send an email to View email address on click.appcast.io. 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. #J-18808-Ljbffr