Senior Backend Engineer, LangSmith Deployments

Senior Backend Engineer

We're building purpose-built infrastructure for running AI agents. Unlike traditional web apps, agents run for long durations, collaborate asynchronously with humans and other agents, and need to survive failures mid-execution. LangSmith Deployments is the runtime that makes this work, with durable checkpointing, fault-tolerant orchestration, and horizontal scaling, deployed across cloud and self-hosted environments.

We're looking for a Senior Backend Engineer to work on this system. While the focus is on backend development, strong familiarity with Kubernetes (K8s), Terraform (Tf), and other DevOps tooling is highly preferred.

• Design distributed queue and worker systems that handle concurrent agent execution, background tasks, and multi-agent coordination across horizontally scalable infrastructure
• Own core data infrastructure — state persistence, atomic job claiming, connection management, and schema evolution
• Collaborate on architectural decisions, ensuring solutions are scalable and robust.
• Ship resumable streaming infrastructure so clients can disconnect and reconnect mid-execution without losing state
• Instrument and monitor production systems — tracing, metrics, and alerting to keep the platform healthy
• Participate in on-call rotations and own incident response for the runtime
• Create and maintain technical documentation, including system design and operational runbooks.
• Contribute to and extend open-source LangGraph, which is used by thousands of developers to build agent applications

We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks. Actual compensation and offerings will vary based on role, level, and location. Team members in the EU, UK, and APAC receive locally competitive benefits aligned with regional norms and regulations.

Benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, meals on in-office days in the US and more.