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.
What is The RoleWe are on the lookout for a Senior Java Developer to join our Elasticsearch team and drive our work on the Inference API in Elasticsearch. The Elasticsearch Inference API is the integration layer between Elasticsearch and external machine learning services including Elastic's own Elastic Inference Service (EIS), third-party providers (Anthropic, OpenAI, Cohere, Google), and self-hosted models. It powers features like semantic search, reranking, and generative AI across Elastic Cloud and in hosted environments. You'll maintain and develop the plugin framework and REST API with your work spanning protocol design, streaming, async execution, billing integration, and with a tight collaboration with the wider inference team and the Kibana team.
What You Will Be DoingBuild and maintain integrations with internal systems and external inference providers, including schema negotiation, streaming (SSE), and error normalisationContribute to the inference plugin's internal architecture: task settings, chunking strategies, rate limiting,



and provider-level configurationReview open source contributions to the codebase and work with third party engineers to ensure their contributions meet our technology standardsParticipate in on-call rotation for inference-related incidentsWrite thorough tests: unit tests using ESTestCase, YAML-based REST integration tests, and rolling-upgrade testsWhat You Bring5+ years of production Java experience, with experience contributing to a large, established Java codebase. You know core Java and are conversant in the standard library of data structures and concurrency constructs, as well as newer language features.
Experience crafting ergonomic APIs and the ability to reason through tradeoffs.
Experience with low-level Java such as concurrency, parallelism, classloaders, etc.
You have a proven track record of using AI to accelerate development, debug complex systems, and optimize code, while still owning the final outcomes.
You possess the ability to collaborate across functions and teams and seamlessly transition between different projects, codebases, or teams based on business prioritiesYou can work autonomously, drive decisions and results in a distributed team by leveraging asynchronous, direct, and transparent communication.
Bonus PointsKnowledge of JDK internals: modules, the Java memory model, garbage collection, database load, caching techniques, etc.
Experience with ML systemsContributions to and ownership of open source projectsKnowledge of Java build tools (Gradle, Maven, etc), with a strong preference for Gradle experience.




Experience working in a platform team or developer productivity teamAdditional Information
- We Take Care of Our PeopleAs 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.
Competitive pay based on the work you do here and not your previous salaryHealth coverage for you and your family in many locationsAbility to craft your calendar with adaptable locations and schedules for many rolesGenerous number of vacation days each yearIncrease your impact
- We match up to $2000 (or local currency equivalent) for financial donations and serviceUp to 40 hours each year to use toward volunteer projects you loveEmbracing parenthood with a minimum of 16 weeks of parental leaveSecurity & Privacy ResponsibilitiesTake ownership of protecting the confidentiality, integrity, and availability of organizational data and systems by following applicable privacy and security policies, standards, and procedures. Ensure that all individual contributions follow Elastic’s Secure Software Development Framework (SSDF). Proactively participate in mandatory role-based training to ensure personal technical execution consistently aligns with the highest standards of data protection, data privacy, and system resilience.
Different people approach problems differently. We need that. Elastic is an equal opportunity employer and is co

📌 Senior Java Software Engineer (España)
🏢 Elastic
📍 España