Staff Software Engineer, Model Infrastructure

Why Harvey At Harvey, we’re transforming how legal and professional services operate. By combining frontier agentic AI, an enterprise-grade platform, and deep domain expertise, we’re reshaping how critical knowledge work gets done for decades to come. This is a rare chance to help build a generational company at a true inflection point. With 2400+ customers in 70+ countries, strong product-market fit, and world-class investor support, we’re scaling fast and defining a new category in real time. The work is ambitious, the bar is high, and the opportunity for growth — personal, professional, and financial — is unmatched. Our team moves fast, takes ownership, and is deeply committed to the mission — operating with intensity, staying close to our customers, and pushing each other for excellence. We live by three values: Decisiveness, Simplicity, and Job's Not Finished. We act quickly on clear judgment over perfect information, we believe simplicity is what scales, and we're never satisfied with where we are. If you want to do the best work of your career alongside people who share that drive, we'd love to build with you. At Harvey, the future of professional services is being written today — and we’re just getting started.

Overview As a Staff Software Engineer on the Model Infrastructure team, you'll lead the design and development of the systems that power every AI request at Harvey. You'll partner closely with AI Research, Product Engineering, Infrastructure, and external model providers to build a platform that is highly reliable, scalable, observable, and efficient. What You’ll Do Lead the design and implementation of Harvey's Model Infrastructure platform. Build systems to ensure high availability, low latency, and operational excellence for AI inference. Design and improve Harvey's Unified Model Controller (UMC) and Model Selector platform to automatically detect model degradations and intelligently route traffic based on reliability, latency, quality, compliance, and cost. Develop systems for model provisioning, capacity management, failover, and traffic engineering across multiple AI providers. Integrate new model providers and maintain provider APIs and SDKs, enabling Harvey to rapidly adopt emerging frontier models. Improve observability through health dashboards, alerting, token usage analytics, cost reporting, and end-to-end telemetry. Partner with Product Engineering to support model launches, experimentation, and proactive monitoring of production AI workloads. Drive infrastructure efficiency through capacity planning, utilization optimization, and cost visibility. Collaborate with AI Research to build the infrastructure foundation for future model evaluation, training, and deployment. Lead cross-functional technical initiatives and mentor engineers across the organization. What You'll Build You'll help build the core platform behind Harvey's AI capabilities, including: Model Reliability & Operations Model health monitoring Automated failover and recovery Capacity provisioning Operational tooling and incident automation Unified Model Controller (UMC) Policy-based model routing Intelligent Model Selector Model health monitoring Traffic management Reliability and latency optimization Provider Platform Multi-provider architecture API and SDK integrations OpenAI, Anthropic, Azure OpenAI, Fireworks, Baseten, and future providers Rapid adoption of new frontier models Observability & Cost Platform Token usage analytics Cost attribution Latency and reliability dashboards Capacity forecasting Utilization optimization AI Platform Foundation Infrastructure supporting model evaluation Model deployment and operations Future model training platform Agent infrastructure and CcaaS What You Have 7+ years of software engineering experience building large-scale distributed systems. Experience designing and operating highly available production services. Strong programming skills in Go, Java, Python, Rust, or