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. 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 Bring 5+ 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 with low-level Java such as concurrency, parallelism, classloaders, etc.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.It doesn’t matter if you’re just out of college or your children are; 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 versátil 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 minimum of 16 weeks of parental leaveDifferent people approach problems differently. 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.Employee Polygraph Protection Act (EPPA)Poster and Know Your Rights (Poster)Elasticsearch develops and distributes technology and information that is subject to U.Belarus, Cuba, Iran, North Korea, Syria, or Russia, including the Ukrainian territories annexed by Russia (The Crimea region of Ukraine, The Donetsk People's Republic (DNR), The Luhansk People's Republic (LNR), Kherson or Zaporizhzhia).

📌 Senior Java Software Engineer - Search Inference - Platform (Madrid)
🏢 Elastic
📍 Madrid