Senior Java Software Engineer

Lineate; Georgia; On-site; USD 120,000 - 180,000; Full time

Job summary

Lineate is seeking a Senior Java Search Engineer to optimize full-text and vector search within backend systems. You will integrate AI/ML components into production services and support AI-driven features.

Requirements include 5+ years in production Java, Spring Boot expertise, and hands-on work with vector search technologies such as Vespa, plus Redis, MySQL, and Kafka. Collaboration across product and data teams is essential.

Qualifications

• 5+ years of hands-on software engineering experience with Java in production environments.
• Strong expertise in Java 25+, Spring Framework / Spring Boot, and modern backend development practices.
• Experience building and optimizing high-performance search systems and search-related services.
• Hands-on experience with vector search technologies (Vespa or similar).
• Solid experience with Redis, MySQL, and Apache Kafka.
• Experience with reactive programming (RxJava).
• Strong understanding of distributed systems, scalability, performance tuning, and reliability.
• Experience designing and implementing APIs and microservices.
• Knowledge of software architecture, testing, and engineering best practices.

Responsibilities

• Developing and optimizing large-scale search functionality with emphasis on full-text and vector search performance.
• Building backend services using Java, Spring, and reactive technologies.
• Designing and improving search relevance, ranking, indexing, and retrieval mechanisms.
• Integrating AI/ML components into production systems and supporting AI-driven product features.
• Building and maintaining reliable data pipelines and event-driven services using Kafka.
• Collaborating with product, data, and engineering teams to deliver scalable search and discovery solutions.

Skills

Java

Spring Framework

Vector search

Redis

MySQL

Apache Kafka

RxJava

Distributed systems

APIs & microservices

Testing & best practices

Tools

Vespa

OpenSearch/Elasticsearch

Weaviate

Job description

About Lineate

Lineate is a US-based international software development company with over two decades of experience.

From Intelligent Document Processing(IDP) and Agentic RAG systems to scalable cloud architectures, we turn complex ideas into real, measurable results.

We deliver AI-driven custom solutions for FinTech, HealthTech, AdTech, and beyond, empowering businesses to grow smarter, faster, and more efficiently.

Our expertise falls into three main categories:

• Building Custom AI Solutions: Deploying high-impact, AI-enabled technology utilizing IDP, Agentic RAG.
• Cloud and Data Infrastructure: Optimizing business operations with our data management and cloud computing solutions.
• Team Augmentation: Providing specialized experts in FinTech, AdTech, and HealthTech to integrate seamlessly and accelerate project timelines.
• Our goal is not just to build technology, but to build the future operating model for our clients.

About the Role

Senior Java Search Engineer who will primarily work on backend development with a strong focus on optimizing full-text and vector search capabilities. The role also involves supporting AI/ML-powered products by integrating and operationalizing AI components within production systems rather than developing ML models from scratch.

Must-have qualifications

• 5+ years of hands-on software engineering experience with Java in production environments
• Strong expertise in Java 25+, Spring Framework / Spring Boot, and modern backend development practices
• Experience building and optimizing high-performance search systems and search-related services
• Hands-on experience with vector search technologies, preferably Vespa, or other vector databases/search platforms (OpenSearch, Elasticsearch, Weaviate, Pinecone, Milvus, Qdrant, etc.)
• Solid experience with Redis, MySQL, and Apache Kafka
• Experience working with reactive programming, preferably RxJava
• Strong understanding of distributed systems, scalability, performance tuning, and reliability
• Experience designing and implementing APIs and microservices
• Good knowledge of software architecture, testing, and engineering best practices

Nice-to-have qualifications

• Production experience with Vespa
• Experience building semantic search, vector search, or Retrieval-Augmented Generation (RAG) solutions
• Familiarity with AI/ML infrastructure and pipelines, including integrating machine learning models into production services
• Experience orchestrating AI-powered services and working with embeddings, ranking, and recommendation systems
• Knowledge of cloud platforms and containerized environments (Docker, Kubernetes)
• Experience with observability, monitoring, and performance analysis tools

Key responsibilities

• Developing and optimizing large-scale search functionality with a strong focus on full-text and vector search performance
• Building backend services using Java, Spring, and reactive technologies
• Designing and improving search relevance, ranking, indexing, and retrieval mechanisms
• Integrating AI/ML components into production systems and supporting AI-driven product features
• Building and maintaining reliable data pipelines and event-driven services using Kafka
• Collaborating with product, data, and engineering teams to deliver scalable search and discovery solutions

Working hours

Candidates must be available to overlap with the New York team from 9:00 AM to 1:00 PM ET. The remaining working hours are flexible.

Tech stack

Java 25+, Spring Boot, RxJava, Redis, Vespa, MySQL, Kafka, Vector Search Technologies, AI/ML Infrastructure.

We offer

B2B contract with Lineate LLC (US)

Lineate is proud to be an Equal Opportunity Employer - We do not hire on the basis of race, colour, religion, creed, gender, national origin, citizenship, age, disability, veteran status, marital status, pregnancy, parental status, sex, gender expression or identity, sexual orientation, or any other basis protected by Georgian legislation. All employment is decided based on qualifications, merit, and business need.

Learn more about Lineate at our website: www.lineate.com