• Set the technical direction for Instacart's home and search web experiences • Build innovative features to help customers discover new retailers • Drive improvements to Core Web Vitals and page load performance • Improve SEO and organic discovery • Partner with ML and backend teams to surface personalized recommendations • Mentor senior engineers

• Define and drive the multi-year technical vision for Home and Cross-Retailer Search infrastructure, spanning retrieval, ranking, indexing, and personalization at scale. • Own the architecture of Instacart's cross-retailer search platform, ensuring correctness, freshness, and low latency as catalog and query volume grows. • Own Home feed ranking and content strategy, retailer selection, and personalized recommendations driven by real-time and batch ML signals. • Partner with ML Platform and Applied Science to productionize ranking models and improve experimentation infrastructure - A/B testing, interleaving, and offline eval • Accelerate developer velocity across the sub-pillar: reduce time-to-production, build reusable components, and make it easy for product teams to experiment with minimal platform friction. • Set the technical bar through design reviews, reliability standards, latency budgets, and observability practices. • Lead major cross-org initiatives end-to-end, from scoping through rollout and post-launch ownership. • Represent the engineering perspective in product and business planning, translating ambiguous problems into well-scoped technical strategies with clear tradeoffs. • Mentor and grow engineers across Home and XRS teams.

Title: Principal Software Engineer Location: Arlington, VA Job Description: About the Team: STR’s Analytics & C2 (AC2) Division develops novel technologies to solve challenging national security problems through advanced analytics. Our team consists of passionate and motivated individuals with degrees in engineering, computer science, mathematics, physics, and data science. We use our expertise and creativity to develop and mature innovative ideas from conception to improve mission success of our customers. The Collaborative Autonomy and Control (CAC) Group in the AC2 Division works to build software systems that solve critical problems in the areas of uncrewed system autonomy, multi-agent collaboration, resource management, and control. By leveraging expertise in machine learning, algorithms, model-predictive control, and software development we build tools that support tactical mission planning and execution, autonomous reasoning, and more. The Role: As a Principal Software Engineer, you will work as part of a tightly knit team to design, develop, implement, integrate, test, and demonstrate advanced algorithms and software systems for autonomous platforms. You will provide technical leadership and mentoring on programs working throughout the software and system development lifecycle, from early prototypes to integrated systems. Your work will develop a diverse set of software tools and applications for mission planning systems, automated control processes, unmanned platforms, DevSecOps, and CI/CD pipelines. This position is based in Woburn, MA, or Arlington, VA, and will take advantage of STR’s flexible, hybrid environment – when the work does not require use of STR’s facilities, you are welcome to work remotely. Who You Are: - U.S. Citizen with ability to get a security clearance - BS in Computer Science or related technical field with 10+ years’ experience - 8+ years experience with C++ or Java - Proven understanding of data structures, algorithms, concurrency, and code optimization - Proven ability to lead and manage moderate size engineering teams (5-10 engineers) through complete Agile development lifecycle including task definition, delegation, and maintenance - Proven ability to lead and manage moderate size engineering teams (5-10 engineers) through complete Agile development lifecycle including task definition, delegation, and maintenance - Demonstrated success driving industry best practices in areas such as code review, unit testing, test coverage, static analysis, etc., to ensure mature, high quality software products - Experience in leading system/software architecture design - Comfortable working both with internal leadership and external customers in the development and execution of software product plans - Experience utilizing the following: - Object-Oriented Programming principles - Agile software lifecycle methodologies and tools, such as JIRA and Sonarqube - Test-driven development methodologies - A demonstrated ability to adopt new languages, libraries, and technologies - Proven ability to develop, implement, integrate, and test autonomy algorithms and software Even Better: - MS or PhD in Computer Science or related technical field - Experience with the following: - Collection Orchestration - Satellite Constellation Management - Coordinating Electronic Warfare resources - Reinforcement learning - Agentic AI - TCPED Management for Tactical ISR - Experience programming for embedded and physical devices - Multi-agent coordination of UxVs - MAVLINK or other C2 protocols - Unreal Engine modeling - ROS - TAK - DevSecOps and CI/CD tool chains - Integration of complex software systems - Constraint satisfaction algorithms - Knowledge representation/ontologies - Python - Active Security Clearance STR is a growing technology company with locations near Boston, MA, Arlington, VA, Dayton, OH, Melbourne, FL, and Carlsbad, CA. We specialize in advanced research and development for defense, intelligence, and national security in: ISR, C2, cyber; next generation sensors, radar, sonar, communications, and electronic warfare; and artificial intelligence algorithms and analytics to make sense of the complexity that is exploding around us. STR is committed to creating a collaborative learning environment that supports deep technical understanding and recognizes the contributions and achievements of all team members. Our work is challenging, and we go home at night knowing that we pushed the envelope of technology and made the world safer. STR is not just any company. Our people, culture, and attitude along with their unique set of skills, experiences, and perspectives put us on a trajectory to change the world. We can't do it alone, though - we need fellow trailblazers. If you are one, join our team and help to keep our society safe! Visit us at www.str.us for more info. Pay Information Full-Time Salary Range: $220,000.00 to $250,00.00 The salary range listed is based on external market data. Offers are based on factors, such as but not limited to, the candidate’s experience, education, training, key skills/critical skills, security clearances, and prevailing market and business conditions. STR is a growing technology company with locations near Boston, MA, Arlington, VA, near Dayton, OH, Melbourne, FL, and Carlsbad, CA. We specialize in advanced research and development for defense, intelligence, and national security in: cyber; next generation sensors, radar, sonar, communications, and electronic warfare; and artificial intelligence algorithms and analytics to make sense of the complexity that is exploding around us. STR is committed to creating a collaborative learning environment that supports deep technical understanding and recognizes the contributions and achievements of all team members. Our work is challenging, and we go home at night knowing that we pushed the envelope of technology and made the world safer. STR is not just any company. Our people, culture, and attitude along with their unique set of skills, experiences, and perspectives put us on a trajectory to change the world. We can't do it alone, though - we need fellow trailblazers. If you are one, join our team and help to keep our society safe! Visit us at www.str.us for more info. STR is an equal opportunity employer. We are fully dedicated to hiring the most qualified candidate regardless of race, color, religion, sex (including gender identity, sexual orientation and pregnancy), marital status, national origin, age, veteran status, disability, genetic information or any other characteristic protected by federal, state or local laws. If you need a reasonable accommodation for any portion of the employment process, email us at appassist@str.us and provide your contact info. Pursuant to applicable federal law and regulations, positions at STR require employees to obtain national security clearances and satisfy the requirements for compliance with export control and other applicable laws.

• Audit and optimize the PDLC across all squads • Design and implement AI-driven QA automation (target: 0% human QA) • Define and roll out AI steering file standards • Build internal developer tools and automations • Improve CI/CD pipelines (validation, deployments, regression detection) • Create guardrails that enable product teams to ship confidently