Junior Data Engineer

Ruby Labs; Polska; Hybrid; PLN 120,000 - 180,000; Full time

Job summary

A leading tech company in Poland is seeking a Junior Data Engineer eager to learn and grow. This role involves supporting ETL/ELT pipelines, assisting in data transformation, and improving data quality under the guidance of senior engineers. The ideal candidate should have basic Python and SQL skills, a curious mindset, and a desire to evolve into a full Data Engineer while contributing to real business data workflows. This position offers remote flexibility and a chance to make an impact.

Benefits

Remote Work Environment

Unlimited PTO

Paid National Holidays

Company-provided MacBook

Flexible Independent Contractor Agreement

Qualifications

• Willingness to improve SQL and Python skills.
• Ability to write clear documentation.
• Curiosity to grow into a mid-level/senior Data Engineer.

Responsibilities

• Support development and maintenance of ETL/ELT pipelines.
• Assist in transforming and loading data into our warehouse.
• Implement monitoring for pipeline health and data quality.
• Contribute to data validation checks and anomaly detection.
• Collaborate with analysts to understand data needs.

Skills

Basic Python skills for data processing

Foundational SQL skills

Familiarity with BigQuery or ClickHouse

Introductory experience with DBT

Understanding of Airflow

Attention to detail

Problem-solving attitude

Job description

About Us

Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer‑led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/

About The Role

We are looking for a Junior Data Engineer who is eager to learn, grow, and contribute to the development of a reliable and well‑structured data platform. You will work closely with the Lead Data Engineer to support data pipelines, documentation, data quality processes, and the overall stability of our data environment (Python, SQL, Airflow, dbt, BigQuery, ClickHouse).

This role is perfect for someone who already has basic technical foundations and wants to evolve into a full Data Engineer by working on production‑grade systems, best practices, and real business data workflows.

Key Responsibilities

• Support the development and maintenance of ETL/ELT pipelines.
• Assist in ingesting, transforming, and loading data into our data warehouse.
• Help implement monitoring and alerting for pipeline health and data quality.
• Contribute to basic data validation checks and anomaly detection processes.
• Support the maintenance of schemas, partitioning, and data structures.
• Write and update documentation for pipelines, workflows, and data models.
• Troubleshoot simple pipeline or data issues with guidance from senior engineers.
• Collaborate with analysts and other stakeholders to understand data needs.
• Participate in improving the reliability and observability of the data platform.

Qualifications

• Basic Python skills for data processing, scripting, and automation.
• Strong foundational SQL skills and willingness to improve.
• Familiarity with cloud data warehouses (BigQuery or ClickHouse is a plus).
• Introductory experience with DBT (models, tests, documentation).
• Basic understanding of workflow orchestration tools such as Airflow.
• Attention to detail and ability to follow engineering best practices.
• Willingness to learn monitoring, alerting, and data quality frameworks.
• Ability to write clear and simple documentation.
• Curiosity, problem‑solving attitude, and desire to grow into a mid‑level/senior Data Engineer.

Why Join Us?

As a Junior Data Engineer, you’ll work directly with an experienced lead and gain exposure to real‑world production systems. You’ll have the opportunity to grow your skills across data pipelines, modeling, data quality, monitoring, and documentation—building a strong foundation for your future career. You will make a meaningful impact by helping ensure data accuracy, reliability, and transparency across the company.

Location

Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours.

Benefits

• Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work‑life balance.
• Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well‑being, without counting days.
• Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
• Company‑provided MacBook: Experience seamless productivity with top‑notch Apple MacBooks provided to all employees who need them.
• Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1dHF4ctKlez75whdn-ybUwP5d5Wr0BdwVrorrm_fM40Q/preview

Interview Process

After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:

• Recruiter Screening (40 minutes)
• Technical Interview (90 minutes)
• Final Interview (60 minutes)

Life at Ruby Labs

At Ruby Labs, we move fast, aim high, and expect the same from our team. We’re not here to play small— we’re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day. This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen. Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more—more responsibility, more growth, and more success.