Staff Software Engineer, Model Infrastructure

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.

Responsibilities

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

Requirements

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 C++; Deep understanding of distributed systems, cloud infrastructure, networking, and observability; Experience leading technical projects across multiple engineering teams; Ability to balance long-term architecture with pragmatic execution; Strong communication and collaboration skills; Passion for building foundational platforms that enable other engineering teams

Nice to have

Experience with AI infrastructure, LLM serving, or machine learning platforms; Experience with model routing, inference gateways, or policy-based serving systems; Experience working with OpenAI, Anthropic, Azure OpenAI, Fireworks, Baseten, or open-source LLMs; Experience with Kubernetes, cloud infrastructure, and service mesh technologies; Experience with large-scale observability and SRE best practices; Experience with data infrastructure technologies such as Kafka, Spark, Flink, Airflow, or Iceberg; Familiarity with GPU infrastructure or model training platforms