{"id":897058,"url":"https://alion.io/job/proofpoint-sr-software-engineer-python","title":"Sr. Software Engineer","company":{"id":5122,"name":"Proofpoint","domain":"proofpoint.com","url":"https://alion.io/company/proofpoint","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":83,"open_postings":12,"ghost_share":0,"stale_share":0.667,"repost_share":0,"time_to_fill_p50_days":38,"computed_at":"2026-11-02T06:13:15Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Belfast, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":78000,"max_usd":150000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":139},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"CI/CD","optional":false},{"name":"Outlook","optional":false},{"name":"Windows","optional":false},{"name":"AI Agents","optional":true},{"name":"Amazon ECS","optional":true},{"name":"AWS","optional":true},{"name":"AWS Lambda","optional":true},{"name":"C#","optional":true},{"name":"CircleCI","optional":true},{"name":"Docker","optional":true},{"name":"DynamoDB","optional":true},{"name":"Git","optional":true},{"name":"GitHub","optional":true},{"name":"PostgreSQL","optional":true},{"name":"Python","optional":true},{"name":"SQL","optional":true},{"name":"Terraform","optional":true}],"status":"live","first_seen_at":"2026-09-14T09:58:05Z","employer_posted_date":"2026-10-16","last_verified_at":"2026-11-03T02:05:32Z","board_verified":true,"closed_at":null,"days_open":49,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":49},"description":"About Us:\nProofpoint 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.\nHow We Work:\nAt Proofpoint you’ll be part of a global team that breaks barriers to redefine cybersecurity guided by our BRAVE core values:\nBold in how we dream and innovate\nResponsive to feedback, challenges and opportunities\nAccountable for results and best in class outcomes\nVisionary in future focused problem-solving\nExceptional in execution and impact\nThe Role\nWe 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.\nYou 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.\n Responsibilities\nIn 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.\nOur 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.\nYou will be expected to:\nProvide or help providing solution to complex problems\nDesign and build reliable distributed systems that handle volumes of data with low latency\nMaintain and support business-critical systems where scale and latency are front-of-mind\nShip code to production every day using CI/CD\nTackle the challenges that come with processing sensitive data\nLearn to build with security in mind\nMake your mark on ambitious projects.\nWhat You Bring to the Team\nThe XFI team’s tech stack includes:\nPython 3.10 or Other Object-Oriented Programming languages are a bonus\nC# is applicable to one of our key services\nAWS Services such as SQS, SNS ECS, ECR, Lambda functions\nHigh volume NoSQL and SQL databases such as Dynamo DB, Postgres\nTerraform built environments\nDevOps tools and methodologies such as: CircleCI pipelines management, Docker containerization, Git and GitHub for software versioning\nOperating 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.\nOur 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.\nWe 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.\nOur 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!\nWhy Proofpoint?\nAt 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:\nCompetitive compensation\n\nComprehensive benefits\n\nCareer success on your terms\n\nFlexible work environment\n\nAnnual wellness and community outreach days\n\nAlways on recognition for your contributions\n\nGlobal collaboration and networking opportunities\n\nOur Culture:\nOur culture is rooted in values that inspire belonging, empower purpose and drive success-every day, for everyone.\nWe encourage applications from individuals of all backgrounds, experiences, and perspectives. If you need accommodation during the application or interview process, please reach out to .\nHow to Apply\nInterested? 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