Data Engineer - Java & Scala (f/m/x)

Sii Poland; Warszawa; Hybrid; PLN 140,000 - 190,000; Full time

Benefits offered by this job

Great Place to Work

Solid financial situation

Contracts with big brands

Centre of internal trainings

Many experts you can learn from

Open and accessible management team

Profit sharing

Passion Sponsorship program

Regular integration events and trips

Comfortable and well-equipped offices

MySii app

Medical care

Job summary

Sii Poland is seeking a Data Engineer in Warsaw to modernize an investment bank's backend data processing platform. You will build scalable pipelines with Scala/Spark and Java, optimize Spark workloads, and collaborate with cross-functional teams in a hybrid work setting with 2–3 days in the office each week.

The role emphasizes data-driven development, ETL/ELT design, and delivering data solutions for banking systems while maintaining high code quality and CI practices.

Qualifications

• Minimum 4 years of experience as a Data Engineer on large-scale data processing projects.
• Strong knowledge of Scala and Apache Spark.
• Practical Java experience and backend/data processing development.
• SQL and relational databases proficiency.
• Experience with distributed systems and Big Data environments.
• Fluent Polish and English, residency in Poland.

Responsibilities

• Design, develop and maintain scalable data pipelines using Scala and Spark.
• Implement ETL/ELT processes for large data volumes.
• Develop and maintain data processing components in Java.
• Optimize Spark application performance and workflows.
• Integrate data from multiple sources for banking systems.
• Collaborate with Data Engineers, Developers, Analysts and business teams.
• Monitor code quality and CI processes.

Skills

Scala

Apache Spark

Java

SQL

Relational databases

Distributed systems

Big Data

Polish language

English language

Job description

We are looking for a skilled Data Engineer to join our team in Warsaw, working on a project focused on modernizing the backend data processing platform for an investment bank. This role involves collaborating with feature teams to enhance data processing capabilities using Big Data technology on an internal cloud. You will be part of a modern, data-driven environment, with a hybrid work model that includes 2-3 days in the office each week. If you are passionate about backend development and data engineering, this opportunity may be the right fit for you.

Your tasks

• Designing, developing, and maintaining scalable data pipelines using Scala and Apache Spark
• Implementing ETL/ELT processes and transformations for large volumes of data
• Developing and maintaining data processing components using Java
• Optimizing the performance of Spark applications and data processing workflows
• Integrating data from various sources and preparing it for further analysis and use by banking systems
• Collaborating with Data Engineers, Developers, Analysts, and business teams to design and deliver data solutions
• Monitoring code quality and conducting continuous integration

Requirements

• Minimum 4 years of experience as a Data Engineer working on projects involving large-scale data processing
• Strong knowledge of Scala and Apache Spark
• Practical experience with Java and developing backend applications or data processing solutions
• Experience designing and implementing ETL/ELT processes and data pipelines
• Good knowledge of SQL and relational databases
• Experience working with distributed systems and Big Data environments
• Advanced knowledge of both Polish and English, and residency in Poland

Job no. JOB-ZMUVM

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care