Senior ETL Developer (f/m/x)

Sii Poland; Bydgoszcz; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Great Place to Work

Centre of internal trainings

Profit sharing

Medical care

Open and accessible management team

Job summary

Sii Poland is seeking a Senior ETL Developer to drive cloud modernization of a data-intensive analytical platform. You will design scalable architectures, optimize ETL pipelines in AWS, and collaborate with software engineers, analysts and QA to deliver reliable data solutions.

Ideal candidates have strong SQL Server/SSIS experience, advanced SQL and data modeling skills, and fluent English. You will work on cost-efficient cloud transformations and performance improvements across the stack.

Qualifications

• Minimum 5 years of ETL development experience.
• Strong Microsoft SQL Server and relational data modeling.
• Hands-on SSIS for ETL design and optimization.
• Experience building ETL processes in AWS (Glue and Lambda).
• Proven ability to optimize stored procedures and data flows.
• Excellent SQL coding standards and operational monitoring.
• Advanced English.

Responsibilities

• Contribute to cloud transformation by designing scalable architectures and modernizing legacy components.
• Lead continual technological evolution by proposing and implementing modern frameworks and architectural improvements.
• Expand analytical capabilities by developing advanced statistical methods and ML models.
• Collaborate with software engineers and analysts to design and build data solutions meeting business needs.
• Ensure adherence to team design and coding standards.

Skills

ETL development

SQL design

AWS Glue

AWS Lambda

SQL performance tuning

English proficiency

Tools

SSIS

Microsoft SQL Server

Python

Windows OS

Job description

We are looking for a Senior ETL Developer to join our team working on the cloud transformation of a data-intensive analytical platform. In this role, you will design scalable architectures, modernize legacy components, and ensure performance, reliability, and cost-efficiency in the cloud environment. You will collaborate closely with a team of software engineers, analysts, and quality engineers to deliver high-quality software solutions that meet business needs. If you are passionate about leveraging AWS technologies and optimizing ETL processes, this opportunity may be the right fit for you.

Your tasks

• Contributing to the cloud transformation of a data-intensive analytical platform by designing scalable architectures and modernizing legacy components
• Leading continuous technological evolution by proposing and implementing modern frameworks and architectural improvements
• Expanding analytical and predictive capabilities by developing and integrating advanced statistical methods and machine learning models
• Working closely with a team of software engineers and analysts to design and build software solutions that meet business needs
• Ensuring adherence to team design and coding procedures and standards

Requirements

• Minimum 5 years of experience in ETL development
• Strong expertise in Microsoft SQL Server, including advanced query design and relational data modeling
• Hands-on experience with SSIS for ETL pipeline design and optimization
• Practical experience building ETL processes in AWS, including AWS Glue and AWS Lambda functions
• Proven ability to optimize stored procedures and debug data flows across dependent components
• Ability to enforce best practices in SQL coding standards and operational monitoring
• Advanced level of English

Nice to have

• Practical experience in the Healthcare IT domain
• Experience in developing highly available architectures in the cloud
• Strong knowledge of Microsoft Windows operating systems and development tools
• Knowledge of statistical modeling methods
• Hands-on experience with Python

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

Job no. JOB-4NULP
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.