[Remote] Senior Backend Engineer, LangSmith Deployments

Note: The job is a remote job and is open to candidates in USA. LangChain is a company focused on building intelligent agents and their associated infrastructure. The Senior Backend Engineer will work on the LangSmith Deployments system, designing and implementing core data infrastructure and ensuring the scalability and robustness of the platform.

Responsibilities

• 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

Skills

• 4+ years of professional backend engineering experience
• Strong proficiency in Go and/or python
• Experience with distributed systems — consensus mechanisms, queueing, state machines, and/or workflow orchestration
• Experience with scaling and sharding databases in high throughput environments
• Familiarity with Kubernetes, infrastructure-as-code, and at least one major cloud platform
• Strong communication skills and ability to work cross-functionally on a small team
• Strong familiarity with Kubernetes (K8s), Terraform (Tf), and other DevOps tooling

Benefits

• Base salary
• Variable compensation for relevant roles
• Meaningful equity
• Benefits
• Perks
• Medical, dental, and vision coverage
• Flexible vacation
• A 401(k) plan
• Meals on in-office days in the US

Company Overview

LangChain is a platform that provides open-source frameworks and tools for engineering and deploying language model agents. It was founded in 2022, and is headquartered in San Francisco, California, USA, with a workforce of 51-200 employees. Its website is https://www.langchain.com.

Company H1B Sponsorship

LangChain has a track record of offering H1B sponsorships, with 5 in 2026, 5 in 2025. Please note that this does not guarantee sponsorship for this specific role.