Software Engineering Manager, AI Observability & Evals Platform NY

At Lang Chain, our mission is to make intelligent agents ubiquitous. We build the foundation for agent engineering in the real world, helping developers move from prototypes to production-ready AI agents that teams can rely on. We began as widely adopted open-source tools and have grown to also offer a platform for building, evaluating, deploying, and operating agents at scale.

With $125M raised at Series B from IVP, Sequoia, Benchmark, CapitalG, and Sapphire Ventures, we’re at a stage where we’re continuing to develop new products, growth is accelerating, and all team members have meaningful impact on what we build and how we work together. Lang Chain is a place where your contributions can shape how this technology shows up in the real world.

Today, our platform includes Lang Smith (Observability, Evaluation, Deployment, Fleet, and Sandboxes), our open source frameworks (Lang Chain, Lang Graph, and Deep Agents), and the newly launched Lang Smith Engine for autonomous agent improvement. We have 100M+ monthly open source downloads, 6,000+ active Lang Smith customers, and 5 of the Fortune 10 use Lang Smith in production (+ 35% of the Fortune 500 overall), including teams at Klarna, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, Linked In, , Nvidia, and Bridgewater.

The Lang Smith team owns and builds Lang Chain'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 Lang Smith end-to-end. If you want to define what great AI observability looks like at production scale, this is where that work gets done.

We’re looking for an Engineering Manager to lead the team building Lang Smith, our observability and evaluation platform for LLM applications. You’ll define the technical direction, grow and mentor a world-class engineering team, and partner with product and design to deliver features that help developers build and deploy trustworthy AI systems with confidence.

• Build, mentor, and grow a high-performing team of engineers, fostering collaboration, ownership, and accountability

• Strengthen Lang Chain’s engineering culture through mentorship, high-quality code, and technical excellence

• Shape long-term technical direction and ensure scalability and reliability of Lang Smith AI Observability Platform

• Partner with product and design teams to define scope, sequence, and success criteria for key initiatives

• Maintain a high bar for technical excellence while making sure the team moves with urgency and focus

• Lead by example in writing clean, maintainable, and well-tested code in Go/Python and Typescript

• Engage directly with customers to understand their needs and translate them into actionable product improvements

• Experience managing or tech-leading teams delivering complex full-stack products

• Strong technical background in Go/Python and React/Typescript

• Solid understanding of databases (Postgres, Redis and Click House)

• Proven ability to design high throughput data-intensive systems

• Bias towards shipping quickly and learning from customers

• Strong communication skills—able to collaborate with internal stakeholders and engage directly with customers

• Bonus:
  Experience building AI/LLM-powered applications, developer tools, or observability platforms

• Annual salary range: $200,000- $250,000

Compensation Philosophy:

We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks.

We are hiring for this role across a range of scope, and the compensation band reflects that. Your offer depends on what we learn about your impact, craft, leadership, and communication during the interview process. We will tell you early where you’re tracking and talk comp with you before offer stage. 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.