Backend Engineer (Java, Kotlin)

Senior Java Backend Engineer

We are looking for a Senior Java Backend Engineer to join a team responsible for developing and scaling a large Product Catalog Platform. The project focuses on building high-performance backend services, improving product data quality, leveraging AI-powered solutions, and processing large-scale datasets to support a modern e-commerce ecosystem. You will have a direct impact on the architecture, performance, and reliability of mission-critical services used to manage and optimize product information at scale.

Your Responsibilities

• Design, develop, test, and maintain high-quality backend services and APIs using Java and Spring Boot.
• Build and evolve systems based on a microservices architecture.
• Design the architecture of new modules and actively propose improvements for existing solutions.
• Ensure software quality through code reviews, documentation, and engineering best practices.
• Collaborate closely with Product Managers, Data Analysts, UX Designers, and other stakeholders to gather and refine business and technical requirements.
• Develop and maintain tools supporting large-scale product catalog management, with a strong focus on stability and performance.
• Contribute to solutions focused on data quality, product matching, and deduplication.
• Work with large datasets to support analytics and data-driven improvements.

Must-Have Skills

• Strong commercial experience with Java.
• Hands-on experience with Spring Boot.
• Experience designing and developing microservices-based systems.
• Proven experience building and maintaining backend applications and APIs.
• Strong understanding of software architecture and scalable system design.
• Experience conducting code reviews and maintaining technical documentation.
• Experience working with relational databases and designing efficient data models.
• Ability to work closely with cross-functional stakeholders and translate business requirements into technical solutions.

Nice-to-Have Skills

• Experience with Kotlin and willingness to work with or extend existing Kotlin-based services.
• Experience with Elasticsearch and search/data indexing solutions.
• Practical experience with Large Language Models (LLMs) and vector databases.
• Experience working with Big Data environments and data warehouses, particularly Google BigQuery.
• Knowledge of text processing, similarity analysis, and AI-powered data solutions.
• Experience with cloud platforms (GCP preferred).

What You'll Work On Product Catalog Management

• Developing and maintaining backend systems that support centralized product catalog operations.

Data Quality & Deduplication

• Building solutions that identify and eliminate duplicate product data using LLMs and vector databases.

Big Data Processing

• Analyzing and processing large volumes of data to improve catalog quality and generate business insights.

Platform Evolution

• Designing and implementing new microservices while continuously improving the existing architecture, scalability, and performance.

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#1201124 - Magdalena Podhorska