Senior Backend Software Engineer, AI Observability & Evals Platform (LangSmith)

FDE Times; Boston (MA); On-site; USD 140,000 - 200,000; Full time

Benefits offered by this job

Medical Coverage

Dental Coverage

Vision Coverage

Flexible Vacation

401(k) Plan

Meals On In-Office Days

Equity

Job summary

LangSmith seeks a backend engineer to design, build, and maintain backend services and APIs for tracing, monitoring, and evaluation workflows, with a focus on performance and reliability for high-volume data. Responsibilities include troubleshooting production issues, documenting systems, and collaborating with engineering, product, and design teams to deliver robust features.

Candidates should have 4+ years in backend engineering and strong experience with Python or Go, API design, and data

Qualifications

• 4+ years of backend engineering experience with complex products.
• Proficiency in Python or Go and strong API design skills.
• Experience with mission-critical systems and performance optimization.

Responsibilities

• Design, build, and maintain backend services and APIs for tracing and monitoring.
• Improve performance and reliability for high-volume data systems.
• Troubleshoot production issues and document systems.
• Collaborate with engineering, product, and design teams to deliver features.

Skills

Backend Engineering

Python

Go

API Design

Backend Services

Data Services

High-Throughput Systems

Performance Optimization

Reliability Engineering

PostgreSQL

Redis

ClickHouse

Cloud Platforms

Production Troubleshooting

Root-Cause Analysis

Cross-Functional Collaboration

Job description

Design, build, and maintain backend services and APIs for LangSmith's tracing, monitoring, and evaluation workflows, while improving performance and reliability for high-volume data. Troubleshoot production issues, document systems, and collaborate with engineering, product, and design teams to deliver features.

Requirements:

Candidates need 4+ years of backend engineering experience with complex products, proficiency in a backend language such as Python or Go, and strong API and reliable data-service design skills. Experience with mission-critical systems, performance and reliability optimization, and cross-functional communication is expected; database and cloud-platform experience is a bonus.

Key Skills:

Backend Engineering, Python, Go, API Design, Backend Services, Data Services, High-Throughput Systems, Performance Optimization, Reliability Engineering, PostgreSQL, Redis, ClickHouse, Cloud Platforms, Production Troubleshooting, Root-Cause Analysis, Cross-Functional Collaboration

Benefits:

• Medical Coverage
• Dental Coverage
• Vision Coverage
• Flexible Vacation
• 401(k) Plan
• Meals On In-Office Days
• Equity