Senior Software Engineer

New York, NY or San Francisco, CA · On-site (5 days/week) · Full-time Compensation: $180,000 to $280,000 + equity About the Company Our client is a venture-backed startup building enterprise-grade AI agents that automate high-stakes contract and document workflows for some of the world's largest companies. The founding team recently joined a major enterprise-software organization through an acquisition, so you get the ownership and pace of an early-stage team with the distribution and resources of a much larger business behind it. Leadership has deliberately kept the group operating in high-velocity startup mode, with its own engineering, product, and go-to-market functions. This is a small, founder-led team with real influence over the product. Early-stage, founder-led team · venture-backed and recently acquired · Industry: AI, Enterprise Software, Legal Tech The Role We are hiring a Senior Software Engineer to own AI and agentic backend and infrastructure work end to end, reporting directly to the founders. The work is greenfield: you will architect core systems from scratch and own the security-critical pieces that enterprise customers depend on, including SOC 2 controls, encryption and key management, customer-held encryption keys (BYOK), and the infrastructure that AI agents run on. There is meaningful cloud infrastructure and DevOps work alongside the backend build. What you'll be doing Architect and build core features from scratch with a focus on reliability, scalability, and security. Own security requirements: SOC 2 controls, encryption and key management, access controls, and customer BYOK. Design and secure the infrastructure that AI agents run on, and build and deploy AI-powered agents in Python. Build robust agent workflows that integrate LLMs, APIs, databases, business systems, and external tools. Stand up and scale cloud infrastructure (AWS or Azure), including a meaningful DevOps component. Establish engineering best practices, tooling, and culture as an early member of a small, high-impact team. Tech stack: Python (ML and agentic infrastructure), AWS or Azure with DevOps, JavaScript/TypeScript, LLM-powered agents, agent orchestration and MCP. Requirements 5+ years building and shipping production backend systems. A track record of shipping production systems in a startup or other high-ownership environment. Time spent at a small startup (under 100 people) as a founder, founding engineer, or early hire. Experience designing or implementing security-sensitive systems such as encryption, key management, and authentication. Hands-on experience building or deploying AI/ML or LLM-powered agents in production. Strong, production-grade Python for ML and agentic infrastructure. Cloud infrastructure experience with AWS or Azure, including DevOps. Production experience with JavaScript or TypeScript. Ability to build agentic systems end to end and reason about agent orchestration and MCP at a systems-design level. High agency: you self-direct, identify problems, and solve them independently. Comfort translating ambiguous enterprise security requirements into concrete systems. Willing to work on-site 5 days per week in New York or San Francisco. Nice to Haves Experience at a larger, established technology company alongside your startup chapters, for balance. Background building or securing systems in a regulated domain (for example fintech or health tech). Why Join Report directly to the founders with a real seat at the table and no layers of management. Greenfield ownership: architect and build core systems from scratch with full control over technical decisions. Security and AI agent work that genuinely matters, shipped for some of the world's largest enterprises. Startup energy and ownership paired with enterprise-scale distribution and resources. A wide-open market at an inflection point, with a team carrying deep AI and commercial-contracting experience. Details Location: New York, NY or San Francisco, CA Work policy: On-site, 5 days per week Compensation: $180,000 to $280,000 plus equity Visa sponsorship: Open to relocation and to transferring existing US work visas (for example H-1B or OPT transfers); new visa sponsorship is not available. Employment type: Full-time #J-18808-Ljbffr