Senior Data Engineer (Cybersecurity)

About the role

Sigma Software is looking for a Senior Data Engineer to join a small, proactive engineering team working on a large-scale cybersecurity product. The customer is a global cybersecurity company that protects applications from automated attacks and malicious traffic. The role involves understanding existing systems, including legacy code and interconnected services, and driving modernization of scalable data infrastructure.

Key responsibilities

• Maintain and enhance existing data processes, focusing on reliability, scalability and performance
• Analyse existing data models, workflows, tables and processing jobs, and identify technical gaps and bottlenecks
• Design, optimize and support large-scale data pipelines and transformation processes
• Drive modernization initiatives and contribute to long-term architectural evolution
• Optimize complex SQL queries and reduce data processing latency
• Collaborate with product engineering and cross-functional teams on technical solutions
• Take part in technical discussions, solution design and continuous improvement

Required profile

• 5+ years of commercial experience in Data Engineering
• Ability to work independently in a high-autonomy environment and drive initiatives from idea to implementation
• Strong analytical thinking, problem-solving and communication skills
• Upper-intermediate English or higher

Required skills

• Expert-level Python and SQL, including query optimization
• Strong hands-on experience with DBT for data transformation and modeling
• Solid understanding of databases (DDL, DML, indexing, normalization)
• Hands-on experience with Snowflake and Elastic Stack
• Proven experience building and maintaining large-scale data pipelines
• A plus: experience with Airflow for workflow orchestration

What we offer

• Diversity of domains and businesses, variety of technologies
• Health and legal support, active professional community and continuous education
• Flexible schedule and remote work
• Offices available if preferred, sports and community activities