Activation Specialist; London

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 Customer Experience team helps customers adopt Lang Smith and turn early momentum into lasting product usage. The team partners closely with GTM, Product, Engineering, and Lang Chain specialists to guide customers through onboarding, production readiness, and the practices required to build reliable AI applications.

We’re looking for an Activation Specialist to join the Customer Experience team. In this role, you’ll work with new customers during their first weeks on Lang Smith, helping them move from signed contract to a working platform that is ready for agents in production. You’ll focus on activation milestones such as admin setup, user onboarding, traces flowing, evaluations in place, and customer teams feeling confident enough to keep building independently.

• Own customer onboarding from kickoff through early activation milestones, including admin setup, SDK integration, first traced run, first evaluation, and Lang Graph deployment.

• Guide customers through core Lang Smith setup and production readiness topics, including security, org design, workload isolation, and integration questions.

• Partner with GTM teams, Product, Engineering, and Lang Chain specialists to unblock customers and coordinate support when deeper expertise is needed.

• Help customers build their first evaluation workflows, define what “good” looks like, and confirm they can debug a production trace independently.

• Route customers to the right resources and turn recurring onboarding questions into runbooks, documentation, and repeatable processes.

• Surface customer friction to Product and Engineering early and track activation metrics such as time to first trace, first evaluation, and production run.

• 2–4 years of experience in a customer-facing role such as support, customer success, account management, onboarding, or a similar function.

• A strong desire to work directly with customers and build productive, trusted relationships.

• Excellent organization and follow-through, with a track record of keeping customers and internal partners aligned.

• A proactive, industrious approach to learning new tools, solving problems, and rolling up your sleeves.

• Clear, friendly written and verbal communication skills.

• Curiosity about technology and AI, plus a willingness to get hands‑on and learn technical concepts on the job.

• Customer onboarding experience at a SaaS company.

• Familiari…