Senior Java + Python Software Engineer

Lineate is a US-based international software development company with over two decades of experience. They are seeking a Senior Java + Python Software Engineer to join their established ML team, focusing on building data pipelines and preparing data that powers ML models in production.

Responsibilities:

• Design, develop, and maintain scalable backend services using Java and Python
• Build and optimize data pipelines for large-scale data processing (primarily with PySpark)
• Collaborate closely with ML engineers to prepare and transform data for ML models
• Work with large datasets to support search relevance and optimization systems
• Improve system performance, scalability, and reliability
• Contribute to architecture decisions and technical design
• Write clean, maintainable, and well-documented code

Requirements:

• 6+ years of commercial software development experience
• Strong hands-on experience with both Java and Python (required)
• Solid experience with Spark / PySpark or similar data processing frameworks
• Proven experience building data pipelines and working with large datasets
• Strong understanding of backend development, system design, and distributed systems
• Experience with APIs and microservices
• Good knowledge of data structures, algorithms, and performance optimization
• Ability to work in hours close to the New York timezone (at least 6 hours overlap with NY team)
• Experience with search and relevance optimization, including: Elasticsearch / Solr (lexical search), Semantic search, vector search, or RAG-based systems, Search relevance tuning
• Experience supporting ML workflows, such as: Data preparation or feature engineering, Recommendation systems or user behavior prediction
• Experience with Databricks (preferred) or similar environments: AWS EMR, Hadoop, Spark ecosystem