Senior Software Engineer, Search

Vannevar is a defense technology company building AI to deter our adversaries. In the 21st century, conflict moves at algorithmic speed and foresight equals firepower. Our agentic AI is purpose-built to compete with China—from cross-Strait conflict to gray zone coercion. Trained on the most mission-relevant datasets in defense, our technology models adversary behavior, simulates campaigns, and recommends the best course of action to decision makers. Our AI systems are some of the most trusted in the industry and actively used on the front lines of the Indo-Pacific to keep the peace and save lives. Exceptional technology starts with exceptional people. Vannevar is a small agile team combining world-class engineers with veteran strategists who bring deep expertise in defense and tradecraft. We’re building a company defined by mission impact, user empathy, and disciplined growth. In just three years, we grew from $3M to $80M in ARR, achieved early profitability, and reached unicorn status—proving that disruption doesn’t require an ego, and staying power doesn’t mean standing still. About the role Search is at the heart of Vannevar’s flagship platform and agentic workflows. We are seeking a Senior Software Engineer, with substantial knowledge and passion for search and information retrieval, to drive innovation in this space. In this role, you will work directly with our ML and product teams to advance a state-of-the-art search system that fundamentally drives our users’ ability to surface mission critical information. What you'll do Design and adapt the technical strategy for search within Vannevar’s products, including how we leverage full-text search, vector databases, LLMs, NLP, and relevance algorithms Improve both search latency and relevance Collaborate with product engineers, designers, and mission strategists to translate user needs into data-informed search innovations Research and apply emerging technologies, trends and best practices in the search/information retrieval domain to improve index quality, freshness, and retrieval performance What we’re looking for You have 7+ years of experience in backend software development, with 3+ years in search, information retrieval, or related fields You have a passion for architecting, developing and deploying reliable, scalable, and performant systems You have expertise in information retrieval, NLP, and machine learning. You have a deep understanding of concepts like indexing, ranking, query parsing, tokenization, and vector search. You have hands-on experience with at least one major search engine (e.g., Elasticsearch, OpenSearch), and familiarity with search evaluation frameworks (e.g., precision, recall, NDCG). You have excellent analytical, problem-solving, leadership, and communication skills. U.S. Person status is required as this position will require the ability to access U.S. only data systems. What we offer Competitive Salary The salary range for this position is $150,000 - $215,000 + equity. Within the range, individual pay is determined by experience, relevant education, and/or training. Comprehensive Benefits We’re proud to offer competitive benefits that support our employees. Some key highlights of our benefits package include: Health, dental, and vision insurance Remote friendly with WeWork access Unlimited PTO, shared downtime during the federal holiday calendar, and company-wide off time at the end of each year 401(k) match Lifestyle & wellbeing stipends Salary top-up during military reserve duty Fully paid parental leave Child and pet care reimbursement during travel Vannevar is an equal opportunity employer, and qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status. We encourage candidates from all backgrounds to apply, even if you don't feel like you're a perfect fit. I