We are looking for a Senior Data Engineer  to join one of the best team at Sigma Software! You can become part of a team of over 300 experts in the AdTech domain by joining our Stellar team. What is Stellar? It’s a community, a network, and a dedicated business unit within Sigma Software that specializes in advertising technology solutions. Over the years, we’ve had the opportunity to work with some of the largest AdTech companies in the world. We’ve helped tons of AdTech startups transform from ideas into thriving businesses. Since 2008, we’ve been working with advertising technology businesses to help them envision, build, and support their technology.  We are building a Competence Center where we stay focused on exploring our domain to become best in class specialists in the industry. If you strive to build long-term cooperation, develop business and relations with top Customers, and are ready to take commitments for common business growth, it could be a perfect match. Responsibilities Maintain and enhance existing data processes, ensuring reliability, performance, and scalability  Improve and support Python-based services and contribute to the development of new ones  Design, implement, and optimize scalable data architecture  Drive system reliability and performance improvements across all data workflows  Oversee and execute data process modernization, including the introduction of new tools and technologies  Manage data flow between local storage, AWS, and Snowflake to ensure performance and cost efficiency  Lead and support the migration of data pipelines and services to Snowflake  Work with and improve the data orchestration layer (Airflow), ensuring stable operation, scalability, and alignment with future platform needs  Collaborate with cross-functional teams to ensure architectural alignment and best practices adoption Requirements 5+ year proficiency in Python for data processing and platform development  Advanced knowledge of SQL and the ability to write efficient and complex queries  Strong hands-on experience with Snowflake  Proficiency in DBT for data transformation and modeling  Practical experience working with Airflow to orchestrate of data workflows  Upper-Intermediate level of English  Personal profile Excellent communication, collaboration, and problem-solving skills, with the ability to work effectively with both technical and non-technical stakeholders  Proven ability to work independently, take ownership of projects, and drive initiatives to completion