Senior ETL Developer (f/m/x) w Poznań, Polska

Expected, PostgreSQL, Python, SQL, PL/SQL

Optional, Apache Kafka, RabbitMQ

About the project, We are looking for an experienced Senior ETL Developer to join our team building a financial market data platform. You will be responsible for designing, developing, and maintaining high-performance data platforms that support analysis processes for FX. Working with large volumes of data, you will process up to 40 million messages daily in a real-time architecture based on PostgreSQL and Python. This position offers you the opportunity to contribute to an enterprise-class platform that handles numerous currency pairs and ensures high availability and scalability of solutions. If you are passionate about data engineering and optimizing data workflows, this opportunity may be the right fit for you.

Your responsibilities, Designing and developing high-performance data platforms using PostgreSQL and Python, Maintaining and optimizing database performance for large data volumes, Implementing ETL processes to ensure efficient data integration and transformation, Collaborating with cross-functional teams to support real-time data access and processing, Monitoring system performance and implementing necessary adjustments for scalability, Creating and managing database models, including normalization and denormalization, Utilizing PL/pgSQL for writing procedures, functions, and triggers, Ensuring data integrity and implementing archiving strategies for data retention

Minimum 5 years of experience working with PostgreSQL, Strong command of SQL and data modeling techniques, Hands-on mastery of PL/pgSQL, including procedures and triggers, Practical experience with database performance tuning and optimization, Experience in ETL integration and working with large data volumes, Familiarity with the Linux environment, Advanced level of Polish and English, Residency in Poland

Optional, Experience with Apache Kafka or RabbitMQ, Knowledge of Apache Airflow and CI/CD practices, Background in the banking or financial sector

What we offer, Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas, Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market, We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022, Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more, Comfortable workplace – class A offices or remote work, Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application, PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers, Investment in your growth – meetups, webinars, training platform and technology blog – you choose, Fantastic atmosphere created by all Sii Power People

Recruitment stages, Send your CV, Talk to us about your expectations, Learn more about our projects and choose the best, Start your adventure with Sii!

Sii Sp. z o.o., Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment., , Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

This is how we work,