Software Systems Engineer - Level 3/4 (AHT)

RELOCATION ASSISTANCE: Relocation assistance may be available CLEARANCE REQUIRED FOR START: Yes CLEARANCE TYPE: SCI TRAVEL: Yes, 10% of the Time Description At Northrop Grumman, our employees have incredible opportunities to work on revolutionary systems that impact people's lives around the world today, and for generations to come. Our pioneering and inventive spirit has enabled us to be at the forefront of many technological advancements in our nation's history - from the first flight across the Atlantic Ocean, to stealth bombers, to landing on the moon. We look for people who have bold new ideas, courage and a pioneering spirit to join forces to invent the future, and have fun along the way. Our culture thrives on intellectual curiosity, cognitive diversity and bringing your whole self to work — and we have an insatiable drive to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Space Systems (NGSP) is looking for you to join our team as a Software Systems Engineer - Level 3/4  based out of Aurora, CO. Key Job Responsibilities • Lead the architecture and implementation of reusable software components for a multi‑variant product line. • Elicit, analyze, and document system‑level functional and non‑functional requirements for the entire product family. • Maintain a traceability matrix linking requirements to design, implementation, and verification artifacts. • Conduct requirement reviews with cross‑functional stakeholders (hardware, firmware, QA, product management) and drive consensus. • Define, develop, and maintain ICDs for all hardware‑software and software‑software interfaces. • Create detailed use‑case diagrams, activity flows, and sequence diagrams that capture user interactions and internal processes. • Collaborate with Agile teams to translate requirements into user stories, backlog items, and sprint deliverables. • Oversee integration testing, validation, and verification of system‑level functionality across product variants. • Continuously assess and improve engineering processes, tooling, and documentation standards. This requisition may be filled at a higher job grade based on the qualifications listed below. This requisition may be filled as either a level 3 or level 4. Basic Qualifications for a Level 3: • Bachelor's degree and 5 years of relevant experience; Master's degree and 3 years of relevant experience; PhD and 1 year of relevant experience. An additional 4 years of relevant experience may be considered in lieu of a degree. • Must be a U.S. citizen with the ability to obtain and maintain a Top Secret/SCI clearance • Ability to elicit, analyze, and document system‑level requirements (functional & non‑functional). • Experience with or knowledge of creating and managing traceability matrices linking requirements to design, code, and verification. • Familiarity with interface control documents (ICDs) and experience defining hardware‑software and software‑software interfaces. • Working knowledge of modeling languages/tools for use‑case, activity, and sequence diagrams. • Experience working in or familiarity with Agile/Scrum environments, including backlog grooming and sprint planning. • Effective communication and interpersonal skills; ability to work successfully with cross‑functional teams. • Proficient in version‑control systems and collaborative development tools (Jira, Confluence, etc.). Basic Qualifications for a Level 4: • Bachelor's degree and 8 years of relevant experience; Master's degree and 6 years of relevant experience; PhD and 4 years of relevant experience. An additional 4 years of relevant experience may be considered in lieu of a degree. • Must be a U.S. citizen with the ability to obtain and mai