Proofpoint

Sr. Software Engineer (Python, C#)

United Kingdom · Work style not stated · Full time

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About the role

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EmployerProofpoint
LocationUnited Kingdom
Work styleWork style not stated
Employment typeFull time
Employer posted8 Oct 2026

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

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Exceptional in execution and impact

The Role

We are looking for a Senior Software Engineer to join the XFI (Cross Functional Integrations) team within the Cloud Integration Group. The XFI team oversees the integration of Post Delivery Protection & Response threat defence software, via API, to the Microsoft or Google e-mail platforms, for both inbound and outbound.

You will be joining the team at an exciting time, as the team prepares to furtherly scale the XFI services and products and the next steps of integration with Microsoft and in future with other email providers.

Responsibilities

In the XFI Team, we deeply appreciate DevOps culture, as we build the XFI services, and we run it. Our day to day involves improving XFI services scalability and reliability; researching security vulnerabilities and implementing security measures; and monitoring production environments to discover what is next for the team using product data.

Our research also includes ways to improve user experience when using our products Outlook clients (desktop and OWA) on both Windows and Mac platforms and to help hardening the Human Security Layer.

You will be expected to:

Provide or help providing solution to complex problems
Design and build reliable distributed systems that handle volumes of data with low latency
Maintain and support business-critical systems where scale and latency are front-of-mind
Ship code to production every day using CI/CD
Tackle the challenges that come with processing sensitive data
Learn to build with security in mind
Make your mark on ambitious projects.

What You Bring to the Team

The XFI team’s tech stack includes:

Python 3.10 or Other Object-Oriented Programming languages are a bonus
C# is applicable to one of our key services
AWS Services such as SQS, SNS ECS, ECR, Lambda functions
High volume NoSQL and SQL databases such as Dynamo DB, Postgres
Terraform built environments
DevOps tools and methodologies such as: CircleCI pipelines management, Docker containerization, Git and GitHub for software versioning

Operating on product integration with the main e-mail platform providers such Google and Microsoft, is an interesting challenge with significant technical complexity, especially when considering the scale of our traffic and our security guarantees.

Our standards around security, quality, and service availability can only be the highest, but at the same time we foster psychological safety, as we are comfortable with the unknowns and love to experiment to find the right solution, which get things done and keep the eyes on results.

We use data to validate our decisions, measuring our progress and success. Data informs our decision making, our goals, and our roadmap. We are sure you will love joining us if you share our focus on outcomes rather than outputs and leverage factual evidence to justify your arguments and influence the direction of the team.

Our main challenge ahead is scaling, both vertically (size of individual tenants) and horizontally (number of total tenants). We will consider experience working with data and infrastructure at scale as a bonus. If you are not sure that you exactly fit all the above criteria, please do get in touch anyway. We are always willing to speak to great candidates even if you do not feel you meet every criteria listed!

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 accessibility@proofpoint.com.

How to Apply

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

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