Posted by employer 9 months ago
First seen on Joblaze 6 months ago
Last verified on the company career page 22 hours ago
Skills & Technologies
Requirements
- Experience
- 5+ years
Not disclosed in this posting: visa sponsorship.
Benefits
Joblaze summary
The Senior Backend Software Engineer at LangChain focuses on developing and maintaining backend systems for the LangSmith observability and evaluation platform, enabling developers to monitor AI applications effectively. Key skills include proficiency in backend languages like Python or Go, along with experience in API design and high-throughput systems. This role is ideal for seasoned engineers with over five years of experience who thrive in collaborative environments and are eager to influence the future of AI observability. LangChain's growth stage and commitment to impactful contributions make it a dynamic workplace.
Joblaze insights
- Listed about 6 months ago — first seen on Joblaze April 14, 2026. Last confirmed on LangChain's careers page November 2, 2026.
- Salary band is in line with the typical range for Backend roles (median ~$180,000).
- Starts above 51% of 160 comparable senior backend roles in United States that list Python we track (median $173,958 across 64 companies). See Python salary trends
- Python appears in 41.2% of 510 comparable senior backend roles in United States; ClickHouse appears in 2.7% of 510 comparable senior backend roles in United States.
Quick facts
- Is the Senior Backend Software Engineer, AI Observability & Evals Platform (SF) role remote?
- No — this is an on-site role in San Francisco, CA.
- What's the salary range?
- LangChain lists $175,000–$225,000 for this role.
- How much experience is required?
- At least 5 years of relevant experience for this Senior Backend Software Engineer, AI Observability & Evals Platform (SF) role.
- Where is the role based?
- LangChain is hiring for this position in San Francisco, CA.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: AWS, Azure, ClickHouse, GCP, Go, PostgreSQL.
- What seniority level is this role?
- LangChain targets senior candidates for this position.
- Is this full-time or contract?
- Full-time for this Senior Backend Software Engineer, AI Observability & Evals Platform (SF) role at LangChain.
From the original posting
About Us
About The Team
The LangSmith team owns and builds LangChain's core platform for observability, evaluation, and production reliability of AI systems. From tracing and annotation to run rules, evaluations, and beyond, this team owns LangSmith end-to-end. If you want to define what great AI observability looks like at production scale, this is where that work gets done.
About The Role
We are looking for a Senior Backend Engineer to join us. In this role you will be building the backend systems that power LangChain’s observability and evals platform. You will work on the core services that allow developers to monitor and evaluate their AI applications at scale. While the focus is on backend feature development, familiarity with fullstack or frontend engineering, performance tuning, and debugging production issues would be extremely valuable.
What You'll Do
Design, develop, and maintain backend services and APIs to support LangSmith’s tracing, monitoring, and evaluation workflows.
Collaborate on architectural decisions to ensure systems are performant and maintainable.
Optimize storage and query performance for high-volume observability and evaluation data.
Ensure system reliability through strong testing, monitoring, and alerting practices.
Troubleshoot and resolve production issues, performing root-cause analysis and implementing long-term fixes.
Create and maintain technical documentation, including system design and API references.
Work closely with full-stack engineers, product managers, and product designers on rolling out new features.
What You'll Bring
5+ years of professional experience in backend engineering working on highly complex products
Proficiency in one or more backend languages/frameworks, ideally Python or Go
Strong understanding of API design and building reliable data services.
Experience with high-throughput or mission-critical systems.
Demonstrated ability to optimize backend services for performance and reliability.
Experience with database systems (Postgres, Redis, Clickhouse), and cloud platforms (AWS, GCP, Azure)
Strong communication skills, with the ability to collaborate cross-functionally
Customer centricity and ownership mentality
Compensation
Annual salary range: $180,000- $240,000
Standard company text repeated across LangChain's postings is omitted here.