Principal Software Test Engineer; Contractor

About Sierra Space

At Sierra Space, we build the missions and systems that keep our world secure in the domain above Earth. Sierra Space team members share a spirit of innovation and collaboration and a belief that we can deliver on the boldest missions in space today. Together with our customers, we aim to safeguard our nation, sustain human presence in space, and secure the freedom of operations in low Earth orbit and beyond.

Our success is measured by the trust of those who rely on what we build and deliver, and our technologies keep the United States and its allies mission‑ready throughout space. We are mission‑driven, and together, we are an extraordinary team.

The Principal Software Test Engineer is a recognized expert in software testing, providing strategic direction and technical leadership over large and complex software testing campaigns. You will lead the development and implementation of innovative testing solutions, drive continuous improvement initiatives, and ensure alignment with industry best practices. Your role will involve managing complex, high‑impact projects, collaborating with senior leadership, and influencing the overall software test engineering strategy.

This position requires a deep understanding of software development principles, software testing tools, methodologies and process, and strong technical leadership skills. You will communicate technical concepts to both technical and non‑technical audiences and present to executive leaders and senior customer representatives.

In this role, you will oversee the design, development, and execution of comprehensive software test plans, test cases, and test procedures to ensure the functionality, performance, and reliability of complex software systems. You will architect and oversee the technical aspects of large‑scale test campaigns for complex aerospace software systems, providing leadership in the innovation and adoption of new software test technologies and methodologies.

You will collaborate with software developers, systems engineers, and other engineering functions, design effective test strategies, and direct others in overseeing the defect lifecycle from discovery to resolution. You will lead the definition of software test risks and opportunities while managing cost and schedule impacts, guiding teams of software test engineers and providing mentorship to ensure high‑quality deliverables.

You will review, analyze, and contribute to the development of software design descriptions, ICDs, and requirements in coordination with software development teams, oversee software test trade studies such as test management tools and Continuous Integration Test techniques, and direct the development and execution of formal verification and qualification tests. Managing test result analysis, generating test reports, and addressing issue definitions, investigations, and closures will be key, along with collaborating closely with cross‑functional peers such as Program Management, Software Development, and Flight Operations to ensure quality throughout the software development lifecycle.

Additional responsibilities include coordinating and defining test roles and responsibilities across multiple simultaneous test campaigns, directing continuous improvement initiatives, and developing enterprise best practices in testing processes and methodologies. You will architect and design sophisticated automated testing tools and frameworks to optimize testing processes, oversee the development, peer review, and management of test plans, test harnesses, test cases, test scripts, test procedures, and test reports for aerospace software systems.

You will liaise with senior‑level internal and external stakeholders to clarify requirements and discuss testing strategies, oversee team execution of software release tests, acceptance tests, and qualification tests, and champion the use of commercial software standards to ensure all test artifacts adhere to Sierra Space quality standards.

Leading regression testing efforts to ensure new software updates do not negatively impact existing functionality or performance, orchestrating…