Senior Software Engineer

About the Role A seed-stage SaaS company serving hardware engineers in complex, regulated industries — including aerospace and defense — is hiring a Senior Software Engineer to own core systems in an AI-assisted cloud platform. This is a high-ownership, product-focused role at a small, early team where your architectural decisions will directly shape the product's technical foundation. You'll work across high-performance diagramming, real-time collaboration, and physics-based simulation in an environment that moves fast and builds for demanding customers. What You'll Do Architect application infrastructure spanning the cloud ecosystem, AI copilot, and physics simulation backend. Lead development of major features end to end — from architecture and implementation through deployment and sustainment. Collaborate closely with the product team to identify and deliver capabilities that customers need. Define and champion technical standards and long-term system architecture as the product and team scale. What We're Looking For Required 5+ years of experience as a software engineer with demonstrated ownership of production systems or large-scale features. Deep expertise in at least one layer of the stack — such as frontend frameworks, real-time collaboration, or AI/ML systems. Proficiency with modern tooling: React , TypeScript , and Python . Strong product intuition and proven ability to collaborate across disciplines in a fast-paced environment. Experience with physics-based modeling and simulation systems. Ability and willingness to work on-site in New York, NY (this is not a remote role). Must be eligible to work in the United States without visa sponsorship. Nice to Have Background in hardware engineering tooling, CAD systems, or regulated industries (e.g., aerospace, defense). Experience building or contributing to real-time collaborative applications. Familiarity with cloud infrastructure design and deployment at scale. Compensation & Benefits Salary: $120,000 – $170,000 per year, depending on experience. Early-stage equity opportunity. Small team with high individual impact and room to grow as the company scales. Location On-site: New York, NY — in-person presence is required. Remote work is not available for this position. Visa sponsorship is not available ; candidates must be authorized to work in the US without sponsorship.