Senior Data Engineer (Cybersecurity)

Sigma Software; Warszawa; On-site; PLN 180,000 - 260,000; Full time

Job summary

Sigma Software in Warsaw seeks a Senior Data Engineer to own and optimize scalable data pipelines for a cutting-edge cybersecurity product. You will analyze existing data models, modernize data workflows, and drive performance improvements in collaboration with cross-functional teams.

The role requires deep autonomy and strong SQL/DBT skills, plus Snowflake and Elastic Stack experience, to influence architecture while delivering reliable, high-throughput data processing.

Qualifications

• 5+ years of commercial experience in Data Engineering
• Expert-level SQL skills with performance optimization
• Hands-on experience with DBT for data transformation and modeling
• Experience with Snowflake and Elastic Stack
• Proven experience building large-scale data pipelines
• Upper-Intermediate English or higher

Responsibilities

• Maintain and optimize existing data processes for reliability and scalability
• Analyze data models, workflows, and processing jobs to identify improvements
• Design and support large-scale data pipelines and transformations
• Drive modernization across the data platform and architecture
• Collaborate with product engineering teams on solutions and implementation
• Ensure best practices in data engineering and performance optimization
• Contribute to short-term delivery goals and long-term platform evolution
• Improve SQL query performance and data latency

Skills

SQL

Data Modeling

Data Transformation

Analytical thinking

Problem solving

English communication

Tools

DBT

Snowflake

Elastic Stack

Airflow

Job description

Join a high-impact cybersecurity project focused on protecting applications from automated attacks and malicious activity. We are looking for a Senior Data Engineer who thrives in autonomous environments, enjoys solving complex data challenges, and is ready to drive modernization initiatives across scalable data systems.

You will become a core member of a small, highly proactive engineering team working on a large-scale cybersecurity product. The role requires deep involvement in understanding existing systems, including legacy code and interconnected services, identifying inefficiencies and technical gaps, and driving meaningful improvements across the platform. You will collaborate closely with product engineering teams, influence technical decisions, and contribute to both immediate optimizations and long-term platform evolution.

As part of Sigma Software, you will collaborate with experienced international teams and have the opportunity to shape scalable data infrastructure used in cybersecurity products operating at scale. We value ownership, strategic thinking, and technical excellence, offering an environment where engineers can influence architectural decisions, drive meaningful improvements, and continue growing professionally.

CUSTOMER

Our Customer is a global cybersecurity company delivering advanced digital protection solutions for businesses, organizations, and communities worldwide. Operating across multiple cybersecurity domains, the company focuses on identifying vulnerabilities, preventing threats, and strengthening digital resilience through scalable and reliable security products.

PROJECT

The project focuses on developing and improving a cybersecurity solution designed to protect applications from automated attacks and malicious traffic. The team works on scalable, high-performance data infrastructure powering security analytics, monitoring, and detection capabilities. The environment combines modernization of legacy systems with the development of reliable and scalable data workflows, requiring strong ownership and close collaboration with cross-functional engineering teams.

Key Technologies: Snowflake, DBT, SQL, Python, Elastic Stack, Airflow

Job Description

• Maintain and enhance existing data processes with a focus on reliability, scalability, and performance optimization
• Analyze and deeply understand existing data models, workflows, tables, and processing jobs
• Identify technical gaps, bottlenecks, inefficiencies, and opportunities for architectural improvements
• Design, optimize, and support large-scale data pipelines and transformation processes
• Drive modernization initiatives across the data platform and contribute to long-term architectural evolution
• Optimize complex SQL queries and improve data processing latency and efficiency
• Collaborate with product engineering and cross-functional teams on technical solutions and implementation strategies
• Contribute to both short-term delivery goals and long-term platform development initiatives
• Ensure adherence to best practices in data engineering, system reliability, and performance optimization
• Participate in technical discussions, solution design, and continuous improvement initiatives

Qualifications

• 5+ years of commercial experience in Data Engineering
• Expert-level SQL skills with practical experience optimizing complex queries for performance and scalability
• Strong hands-on experience with DBT for data transformation and modeling
• Solid understanding of database concepts, including DDL, DML, indexing, normalization, and advanced SQL techniques
• Hands-on experience working with Snowflake
• Experience with Elastic Stack technologies
• Proven experience designing, building, and maintaining large-scale data pipelines
• Strong analytical thinking and problem-solving skills
• Ability to work independently in a high-autonomy engineering environment
• Experience driving technical initiatives from idea through implementation
• Strong communication and collaboration skills
• Upper-Intermediate English level or higher

WILL BE A PLUS

• Experience with Airflow for workflow orchestration