Senior Software Engineer (Java)

Acoustic; Województwo pomorskie; Hybrid; PLN 213,000 - 299,000; Full time

Job summary

A tech company located in Poland is looking for a Java Developer to join their product team. You'll design and implement applications focusing on real-time data processing and collaborate on data pipelines using technologies like Apache Flink and Confluent Kafka. This position offers a hybrid or remote work model, making it suitable for candidates who thrive on independence and have strong software engineering skills.

Qualifications

• Strong hands-on experience with Java.
• Experience with Apache Flink and Kafka (preferably Confluent platform).
• Comfortable with MongoDB and/or Snowflake in production environments.

Responsibilities

• Design and implement Java applications with a strong focus on real-time data processing.
• Build and maintain streaming data pipelines using Apache Flink and Confluent Kafka.
• Collaborate with internal Snowflake experts to optimize pipeline efficiency.

Skills

Java

Apache Flink

Kafka

MongoDB

SQL

Data engineering principles

Proactive communication

Tools

Confluent Kafka

Snowflake

Job description

Overview

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)

Qualifications

• 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)