Principal Software Engineer

Overview

Come work at a place where innovation and teamwork come together to support the most exciting missions in the world!

Job Description

Qualys is seeking a Principal Software Engineer to join the Enterprise TruRisk Management (ETM) team, responsible for building large-scale data platforms that power vulnerability management, asset discovery, and threat intelligence across millions of assets globally.

In this role, you will design and build high-performance distributed systems that process and analyze massive security datasets. You will collaborate with engineering, product, and architecture teams to develop scalable microservices and data pipelines that enable real-time security insights for enterprise customers.

This role requires strong expertise in Java, distributed systems, big data technologies, and large-scale search platforms.

Key Responsibilities:

Architecture & Design

• Lead the design and architecture of scalable distributed systems for asset intelligence, finding intelligence and threat management.
• Define architecture patterns for microservices-based platforms handling high-volume data ingestion and processing.
• Drive technical direction and platform evolution for ETM data infrastructure.
  
  
  

Platform Development

• Design and implement high-performance backend services in Java.
• Build and optimize large-scale data pipelines using technologies such as Kafka, Spark, Hadoop, and streaming frameworks.
• Develop services that support real-time and batch data processing for security analytics.
  
  
  

Data Platform & Search

• Architect and maintain large-scale Elasticsearch/OpenSearch clusters used for asset indexing, finding indexing, its search, and analytics.
• Design efficient indexing strategies and data models for efficient ingestion
• Optimize query performance and data retrieval across billions of records.
  
  
  

Scalability & Reliability

• Build fault-tolerant, highly available services capable of operating at cloud scale.
• Ensure systems meet performance, reliability, and security requirements.
• Drive improvements in observability, monitoring, and operational excellence.
  
  
  

Technical Leadership

• Provide technical leadership and mentorship to engineering teams.
• Drive design reviews, architecture discussions, and best practices.
• Influence cross-team platform strategy and engineering standards.
  
  
  

Collaboration

• Partner with product management, security researchers, and data engineers to deliver impactful ETM features.
• Work closely with platform and infrastructure teams to optimize system performance and scalability.
  
  
  

• Excellent programming and designing skills with 8-12 years of hands-on experience in Java back-end development and skills with Spring-boot framework.
• Experience with Apache Kafka for distributed streaming and messaging.
• In-memory caching using Redis, Memcached, etc.
• Strong Java programming skills including object-oriented design, prototyping, development, testing, profiling, etc.
• Experience with big data processing frameworks such as Apache Spark and Hadoop.
• Expertise with RDBMS systems (preferably Oracle)
• Experience with NoSQL databases (preferably Cassandra)
• Knowledge of Docker, Kubernetes, Jenkins, and related CI/CD tools
• Ability and skill to debug & solve complex issues in a high-performing environment.
• Experience with SAAS based software products and solutions for service-oriented deployment in public or private clouds.
• Bachelors/Masters in Computer Science or Engineering equivalents