Sr. Software Engineer

Location: Belfast, Northern Ireland

About Us

Proofpoint is a global leader in human- and agent-centric cybersecurity. We protect how people, data, and AI agents connect across email, cloud, and collaboration tools. Over 80 of the Fortune 100, 10,000 large enterprises, and millions of smaller organizations trust Proofpoint to stop threats, prevent data loss, and build resilience across their people and AI workflows. Our mission is simple: safeguard the digital world and empower people to work securely and confidently. Join us in our pursuit to defend data and protect people.

How We Work

• At Proofpoint you’ll be part of a global team that breaks barriers to redefine cybersecurity guided by our BRAVE core values:
• Bold in how we dream and innovate
• Responsive to feedback, challenges and opportunities
• Accountable for results and best in class outcomes
• Visionary in future focused problem-solving
• Exceptional in execution and impact

The Role

Proofpoint is looking for a highly motivated Sr. Software Engineer to join the Threat Response product engineering team. This role focuses on designing distributed systems, solving scalability challenges, and building high-performance backend services operating at scale.

What You Bring to the Team

• Extensive software development experience building enterprise or SaaS applications
• Excellent programming skills in Java and/or Python, with a demonstrated ability to design, implement, and maintain large-scale production systems
• Experience building and operating large-scale, multi-tenant SaaS platforms.
• Experience designing scalable distributed systems that process high volumes of events, messages, or transactions
• Experience designing scalable processing frameworks that support parallel execution, tenant isolation, and fair resource utilization
• Experience working with PostgreSQL or other relational databases, including query optimization, performance tuning, and database scalability
• Demonstrated ability to effectively leverage AI-assisted engineering tools as a force multiplier for software design, implementation, testing, debugging, and operational support
• Strong analytical, problem-solving, communication, and collaboration skills.
• BSc degree in Computer Science, Engineering, or equivalent practical experience

Preferred Qualifications

• Experience with AWS cloud services and modern cloud application architectures
• Experience with messaging and streaming technologies such as Kafka, SQS, or similar platforms
• Experience optimizing application efficiency, system throughput, and resource utilization in large-scale production environments
• Experience integrating with Microsoft 365, Microsoft Graph, Google Workspace, or other enterprise SaaS platforms
• Experience with modern frontend technologies such as React or TypeScript.
• Why Proofpoint?
• At Proofpoint, we believe that an exceptional career experience includes a comprehensive compensation and benefits package. Here are just a few reasons you’ll love working with us:
• Competitive compensation
• Comprehensive benefits
• Career success on your terms
• Flexible work environment
• Annual wellness and community outreach days
• Always on recognition for your contributions
• Global collaboration and networking opportunities

Our Culture

Our culture is rooted in values that inspire belonging, empower purpose and drive success-every day, for everyone.

We encourage applications from individuals of all backgrounds, experiences, and perspectives. If you need accommodation during the application or interview process, please reach out to [email protected].

How to Apply

Interested? Submit your application along with any supporting information- we can’t wait to hear from you!