Senior Backend Developer – Java/Spring Boot, Agentic LLMs

HumanIT Digital Consulting

. Develop and improve a large Java backend powering web applications, mobile experiences and integrations with external systems .

Posted 10/28/2026full-timeRemoteSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in Java backend engineering, particularly with Java 17, Spring Boot, and Hibernate, while applying functional programming principles and event-driven development. Proficient in building scalable distributed systems and integrating LLM-powered features into backend services.

Highest-signal resume keywords

Java Backend EngineeringSpring Boot 2.x/3.xPostgreSQLApache KafkaEvent-Driven Development

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Java 17Spring BootHibernateREST APIsDistributed SystemsFunctional ProgrammingLLM IntegrationTestingDebuggingCode Quality

Soft Skills

CollaborationOwnershipSound Judgment

Tools & Technologies

GitMavenCursorClaude CodeGitHub CopilotDockerKubernetesAWSTerraformCI/CD

Industry Keywords

Event ProcessingAsynchronous SystemsRAG PipelinesAgentic WorkflowsMulti-Agent Workflows

Tech Stack

Tools & technologies

ApacheAWSDistributed SystemsDockerElasticSearchHibernateJavaKafkaKotlinKubernetesMavenPostgresRedisScalaSpringSpring BootSpringBootTerraform

About the role

Key responsibilities & impact

Develop and improve a large Java backend powering web applications, mobile experiences and integrations with external systems
Implement reliable features end-to-end
Work closely with product and engineering colleagues
Build and maintain distributed services and asynchronous event processing
Apply agentic LLM knowledge in practical Java development, including integrations, retrieval and automation where relevant
Contribute hands-on software engineering rather than AI research or architecture-only work
Take ownership of code quality, testing, debugging and end-to-end delivery

Requirements

What you’ll need

6+ years of hands-on Java backend engineering, ideally Java 17
Experience with Spring Boot 2.x/3.x and Hibernate 5.x/6.x
Experience building and maintaining scalable distributed systems
Experience with REST APIs and relational data models with PostgreSQL
Practical event-driven development with Apache Kafka or comparable messaging/streaming technologies
Strong familiarity with functional programming principles, including immutability, pure functions and concurrency-aware design
Hands-on familiarity with LLMs and agentic workflows, including RAG pipelines, agent/tool interactions and LLM orchestration
Ability to discuss concrete LLM implementations
Regular use of AI-assisted coding tools such as Cursor, Claude Code or GitHub Copilot
Sound judgment about code quality and testing
Git, Maven, testing, debugging and end-to-end delivery ownership
Fluent professional English, B2 minimum; C1 preferred
Preferred: experience with Model Context Protocol (MCP), autonomous agents or multi-agent workflows
Preferred: Scala, Kotlin or functional Java libraries such as Vavr
Preferred: Elasticsearch, vector search/embeddings, Redis and performance optimisation
Preferred: Docker, Kubernetes, AWS, Terraform and CI/CD
Preferred: experience integrating LLM-powered features into existing backend services

Benefits

Comp & perks

Full remote work across Europe