Senior Big Data Engineer (AdTech Cybersecurity)

Sigma Software; Warszawa; On-site; PLN 180,000 - 280,000; Full time

Job summary

Sigma Software is seeking a Senior Big Data Engineer to join a long-term project in the cybersecurity and AdTech domain, focusing on real-time risk assessment for digital advertising ecosystems.

You will optimize Snowflake usage, identify inefficiencies in data pipelines and SQL queries, and contribute to backend Java-based services in a fast-paced, high-load environment. English proficiency is required, with opportunities to shape platform architecture and cost efficiency.

Qualifications

• At least 5 years of commercial Big Data engineering experience.
• Strong hands-on Snowflake expertise.
• Proficient in Python and Java.
• Advanced SQL knowledge and query optimization experience.
• Solid Computer Science fundamentals.
• Upper-Intermediate or higher English.

Responsibilities

• Optimize Snowflake usage and improve infrastructure cost efficiency.
• Identify inefficiencies in data pipelines and SQL queries.
• Implement performance and cost optimization improvements.
• Enhance and maintain Java-based services.
• Implement and support new platform features.
• Improve existing engineering processes and platform components.
• Develop scalable and reliable solutions for high-load environments.
• Collaborate with distributed engineering teams to deliver stable platform functionality.
• Contribute to architecture improvements and implementation of new components

Skills

Big Data

Python

Java

SQL

Tools

Snowflake

Job description

• Full-time

Company Description

Are you passionate about building scalable Big Data solutions and optimizing high-load platforms? We are looking for a Senior Big Data Engineer to join a long-term project in the cybersecurity and AdTech domain focused on real-time risk assessment for digital advertising ecosystems.
We at Sigma Software offer the opportunity to work on impactful products, collaborate with experienced engineering teams, and contribute to solutions operating on large-scale datasets in a fast-paced environment. You will have the freedom to influence technical decisions and drive meaningful improvements across the platform.

CUSTOMER

Our Customer operates in the cybersecurity domain and develops solutions aimed at protecting organizations and digital ecosystems from online risks and vulnerabilities. The company focuses on building advanced technologies that improve security, reliability, and operational resilience across various industries.

PROJECT

The project is a real-time risk assessment platform for digital advertising ecosystems. The solution helps customers identify potentially low-quality or fraudulent traffic and automatically make decisions before allocating advertising budgets. The platform processes large-scale data streams and requires continuous improvements in performance, scalability, and cost efficiency.

At the initial stage, the role will focus on Snowflake optimization and identifying inefficiencies in data pipelines and SQL queries. In the long term, the engineer will contribute to backend development, platform architecture improvements, and implementation of scalable Java-based services.

Job Description

• Optimize Snowflake usage and improve infrastructure cost efficiency
• Identify inefficiencies in data pipelines and SQL queries
• Implement performance and cost optimization improvements
• Enhance and maintain Java-based services
• Implement and support new platform features
• Improve existing engineering processes and platform components
• Develop scalable and reliable solutions for high-load environments
• Contribute to architecture improvements and implementation of new components
• Collaborate with distributed engineering teams to deliver stable platform functionality

Qualifications

• At least 5years of commercial experience in Big Data engineering
• Strong hands‑on experience with Snowflake
• Strong expertise in Python
• Strong expertise in Java
• Advanced SQL knowledge and experience optimizing complex queries
• Solid Computer Science fundamentals
• Upper-Intermediate or higher English level

WILL BE A PLUS

• Experience with AWS cloud services
• Experience working with Amazon S3
• Experience in AdTech, cybersecurity, fraud detection, or risk assessment domains

Additional Information

PERSONAL PROFILE

• Proactive and ownership-driven mindset
• Strong analytical and troubleshooting skills
• Ability to work effectively in fast-paced environments
• Team-oriented communication style
• Focus on scalable and maintainable engineering solutions