Senior Software Engineer (Java)

We’re looking for a Java Developer who thrives on autonomy and enjoys solving complex data challenges. This role is ideal for someone who combines strong software engineering fundamentals with a passion for real-time data processing.
You’ll be part of a 9-person product team (developers, QA, DevOps, PM), working closely with fellow Java engineers — not a separate data team. We build streaming-first systems using Apache Flink (DataStream API) integrated with Confluent Kafka, backed by Snowflake and MongoDB. You'll design and implement production-grade pipelines, propose data schemas, and work with stakeholders through practices like interface reviews.We don’t expect you to know everything upfront — but we do expect curiosity, initiative, and the ability to deliver working systems with the bigger picture in mind.What You’ll Do

• Design and implement Java applications with a strong focus on real-time data processing
• Build and maintain streaming data pipelines using Apache Flink (DataStream API) and Confluent Kafka
• Propose data models and collaborate with our internal Snowflake experts to optimize pipeline efficiency
• Work with MongoDB and Snowflake for storage and querying
• Write and tune SQL for data transformation and validation
• Contribute to code reviews, CI/CD pipelines, and testing strategies
• Participate in daily standups and planning meetings (remote-friendly)

Requirements

• Strong hands-on experience with Java
• Experience with Apache Flink and Kafka (preferably Confluent platform)
• Comfortable with MongoDB and/or Snowflake in production environments
• Confident writing SQL and working with large-scale data
• Understanding of modern data engineering principles
• Proactive, communicative, and comfortable proposing technical solutions

Nice to Have

• Experience with or interest in dbt (data build tool)
• Understanding of distributed systems and streaming architectures
• Familiarity with AWS

Working Style

• Hybrid or remote, office available in Gdańsk, but not required
• English fluency required (company is USA-based)