Software Engineering Manager, Database (SmithDB)

LangChain; San Francisco (CA); On-site; USD 215,000 - 260,000; Full time

Benefits offered by this job

Medical, dental, and vision coverage

Flexible vacation

Meals on in-office days

Job summary

LangChain is seeking a hands-on Engineering Manager to lead the SmithDB team, focusing on building a storage and query layer for AI observability. This role involves writing production code, overseeing team health, and making architectural decisions while keeping technical expertise sharp.

The ideal candidate should have over 7 years of relevant experience, including Rust programming and operating distributed services on Kubernetes. Competitive compensation includes salary, equity, and benefits such as medical coverage and a 401(k) plan.

Qualifications

• 7+ years in systems or database engineering, with at least 2 years in a technical lead or engineering management role.
• Production Rust experience with scale structuring opinions.
• Deep understanding of database or storage engine internals.

Responsibilities

• Write and review production Rust code across ingestion, query execution, and storage layers.
• Lead architectural decisions on storage format, compaction, indexing, and query planning.
• Drive performance investigations using memory and CPU profiling tools.

Skills

Systems engineering

Database engineering

Rust programming

Kubernetes

Performance analysis

Job description

About the team

SmithDB is LangChain's internal database team. We're building a storage and query layer purpose-built for AI observability and evaluation. Within six months we went from idea to a production system that offers industry leading performance and scalability for agent observability data. We're a small, fast team of systems engineers tackling genuinely hard problems: storage layout, query execution, compaction, and scaling toward trillions of agenbt traces. We develop in Rust, run on Kubernetes, and integrate tightly with S3/GCS/Azure Blob. There are no legacy constraints; this is a greenfield system with real production load and ambitious engineering goals.

About the role

We're looking for a hands-on Engineering Manager to lead the SmithDB team. This is not a pure people‑management role. You'll write production code, review PRs at the systems level, make architectural calls, and be in the weeds alongside your engineers. At the same time, you'll own team health, hiring, technical roadmap, and coordination with the broader LangSmith platform. The ideal candidate has deep systems or database engineering experience and genuinely prefers to stay technical while growing a team.

What you'll do

• Write and review production Rust code across ingestion, query execution, and storage layers
• Lead architectural decisions on storage format, compaction, indexing, and query planning
• Drive performance investigations using memory and CPU profiling tools; own the path from profiling to shipped fix
• Design and harden the distributed deployment of SmithDB services on Kubernetes (multi-tenant, high-throughput, low-latency)
• Contribute to cloud object store integrations (S3, GCS, Azure Blob) and set the standard for how SmithDB manages data at rest and in flight
• Build and maintain observability for the engine itself: metrics, tracing, debug tooling
• Manage a small but growing team of systems engineers: set goals, run 1:1s, provide technical mentorship, and grow careers
• Own the SmithDB technical roadmap in partnership with LangSmith product and engineering leadership
• Communicate progress, risks, and tradeoffs clearly to the broader organization: you write concise, decision-ready updates

What you'll bring

• 7+ years in systems or database engineering, with at least 2 years in a technical lead or engineering management role
• Production Rust experience — you can write it, review it, and have opinions on how to structure it at scale
• Deep understanding of database or storage engine internals: query execution, storage layouts, indexing, compaction
• Proficiency in systems performance analysis: memory allocators, CPU hotspots, lock contention, async runtimes (Tokio)
• Experience deploying and operating distributed services on Kubernetes in a production, multi-tenant environment
• Familiarity with cloud object storage (S3-compatible APIs, consistency models, cost/performance tradeoffs)
• Proven track record of managing engineers — you can recruit, retain, and level‑up a team without losing your technical edge

Nice-to-have

• Experience building or contributing to columnar storage formats (Parquet, Arrow), OLAP query engines, or time‑series stores
• Background in observability infrastructure or tracing pipelines (OpenTelemetry, ClickHouse, Prometheus)
• Experience scaling a system from early‑stage to hundreds of billions / trillions of records

Compensation

Salary Range: $215,000-$260,000 USD

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

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