Senior Software Engineer, Site Defense

We are looking for a Senior Software Engineer to join the Site Defense team within Reddits Infrastructure organization. Site Defense is responsible for protecting Reddit at internet scaleserving as the first line of defense against DDoS attacks automated abuse large-scale scraping and other network-level threats. This is a high impact role that sits at the intersection of distributed systems networking security and applied machine learning. You will help design and operate critical infrastructure that safeguards Reddits availability performance and trust.

You will:

• Design build and operate high-scale low-latency systems that protect Reddit from DDoS attacks bots and automated abuse.
• Analyze develop and evolve ingress-level defenses across CDN edge and internal infrastructure layers.
• Build systems to detect score and mitigate malicious traffic in real time at per-request and per-user granularity
• Partner closely within Infrastructure and with Security and internal Safety teams to balance security performance and user experience
• Mentor junior engineers in their professional growth.
• Contribute to the teams ML-at-Ingress initiatives including experimenting with models for traffic classification bot detection and anomaly detection
• Own services end-to-end including design implementation on-call and operational excellence
• Participate in incident response and post-incident analysis for large-scale network or abuse events

You have:

• 5 years of experience building and operating high throughput and low latency production distributed systems.
• Software development experience in one or more general purpose programming languages; Python Go Rust Java C.
• Excellent communication skills to collaborate with a service-oriented team and company.
• Experience with DDoS mitigation WAFs bot management or abuse prevention systems.
• Experience with networking fundamentals (HTTP TLS TCP/IP proxies CDNs load balancing).

Nice to have:

• Prior experience with cloud infrastructure systems (Kubernetes AWS / GCE ecosystems).
• Familiarity with ML systems in production especially real-time inference or feature pipelines.
• Knowledge of traffic analysis anomaly detection or large-scale telemetry systems.

Benefits:

• Comprehensive Healthcare Benefits and Income Replacement Programs
• 401k with Employer Match
• Global Benefit programs that fit your lifestyle from workspace to professional development to caregiving support
• Family Planning Support
• Gender-Affirming Care
• Mental Health & Coaching Benefits
• Flexible Vacation & Paid Volunteer Time Off
• Generous Paid Parental Leave

#LI-remote #LI-JS5

In select roles and locations the interviews will be recorded transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out of recording transcription and summarization prior to any scheduled interviews.

During the interview we will collect the following categories of personal information: Identifiers Professional and Employment-Related Information Sensory Information (audio/video recording) and any other categories of personal information you choose to share with us. We will use this information to evaluate your application for employment or an independent contractor role as applicable. We will not sell your personal information or disclose it to any third party for their marketing purposes. We will delete any recording of your interview promptly after making a hiring decision. For more information about how we will handle your personal information including our retention of it please refer to our Candidate Privacy Policy for Potential Employees and Contractors.

Reddit is proud to be an equal opportunity employer and is committed to building a workforce representative of the diverse communities we serve. Reddit is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If due to a disability you need an accommodation during the interview process please let your recruiter know.