Principal Software Engineer - Agent Builder - Search

Greece; Ireland; Israel; Portugal; Spain; Sweden; United Kingdom

Elastic, the Search AI Company, enables everyone to find the answers they need in real time, using all their data, at scale — unleashing the potential of businesses and people. The Elastic Search AI Platform, used by more than 50% of the Fortune 500, brings together the precision of search and the intelligence of AI to enable everyone to accelerate the results that matter. By taking advantage of all structured and unstructured data — securing and protecting private information more effectively — Elastic’s complete, cloud‑based solutions for search, security, and observability help organizations deliver on the promise of AI.

Elastic is building Agent Builder, a conversational platform that connects production agents to real customer business data in Elasticsearch. As a Principal Engineer, you will set technical direction and drive the Kibana backend architecture for the agentic platform: streaming APIs, secure tool execution, session and memory persistence, retrieval and citations contracts, and evaluation telemetry. Your influence will extend beyond a single feature, shaping service boundaries, reliability posture, and standards that other solutions build on.

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• Own the architecture for chat back‑end services (Node/TypeScript), defining service boundaries, data contracts, and scalability targets
  
• Lead cross‑team design reviews; author ADRs and RFCs that become reference standards for AI‑chat and ingestion work.
  
• Build and harden event‑driven pipelines that capture chat telemetry, evaluation traces, and LLM feedback loops; expose them via self‑service analytics endpoints.
  
• Champion reliability—define error budgets, introduce testing strategy, and steer incident‑response playbooks for conversational workloads.
  
• Mentor senior and Junior engineers; grow their system‑design skills and foster a high‑trust, low‑ego culture.
  
• Partner with Product, Design, and Data Science to translate ambiguous goals (e.g., “multi‑step reasoning with tool calling”) into incremental, testable action items.
  
• Represent Elastic in open‑source AI communities (LangGraph/LangChain, MCP/A2A) through design proposals, blog posts, and conference talks.
  

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• We appreciate articulate and “low ego” people who want to grow as part of a team.
  
• 10 + years building distributed, production SaaS services—at least 5 years leading large‑scale Node/TypeScript or similar back‑end stacks.
  
• Deep expertise in distributed systems fundamentals—shard routing, consensus, eventual consistency, back‑pressure, and circuit‑breaker patterns.
  
• Demonstrated success designing high‑throughput, low‑latency APIs (gRPC / REST / WebSocket)—including streaming responses and resumable sessions.
  
• Hands‑on experience with observability: OpenTelemetry, log/metric pipelines, synthetic checks, and SLO dashboards.
  
• Exposure to LLM tooling (LangChain/LangGraph, OpenAI function calls, vector‑search, RAG orchestration) and enthusiasm for advancing GenAI architectures.
  
• Clear, persuasive written communication—your ADRs and RFCs set the standard others emulate.
  
• Nice‑to‑have: contribution history to Kibana or other large SPAs; ability to prototype front‑end dashboards when it unblocks back‑end work.
  

As a distributed company, diversity drives our identity. Whether you’re looking to launch a new career or grow an existing one, Elastic is the type of company where you can balance great work with great life. Your age is only a number. It doesn’t matter if you’re just out of college or your children are; we need you for what you can do.

We strive to have parity of benefits across regions and while regulations differ from place to place, we believe taking care of our people is the right thing to do.

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• Competitive pay based on the work you do here and not your previous salary
  
• Health coverage for you and your family in many locations
  
• Ability to craft your calendar with flexible locations and schedules for many roles
  
• Generous number of vacation days each year
  
• Increase your impact – We match up to $2000 (or local currency equivalent) for financial donations and service
  
• Up to 40 hours each year to use toward volunteer projects you love
  
• Embracing parenthood with minimum of 16 weeks of parental leave
  

Elastic is an equal opportunity/affirmative action employer committed to diversity, equity, and inclusion. Qualified applicants will receive consideration for employment without regard to race, ethnicity, color, religion, sex, pregnancy, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, disability status, or any other basis protected by federal, state or local law, ordinance or regulation.

We welcome individuals with disabilities and strive to create an accessible and inclusive experience for all individuals. To request an accommodation during the application or the recruiting process, please email We will reply to your request within 24 business hours of submission.

Elasticsearch develops and distributes encryption software and technology that is subject to U.S. export controls and licensing requirements for individuals who are located in or are nationals of the following sanctioned countries and regions: Belarus, Cuba, Iran, North Korea, Russia, Syria, the Crimea Region of Ukraine, the Donetsk People’s Republic ("DNR"), and the Luhansk People’s Republic ("LNR"). If you are located in or are a national of one of the listed countries or regions, an export license may be required as a condition of your employment in this role. Please note that national origin and/or nationality do not affect eligibility for employment with Elastic. xcfaprz

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