Senior Software Engineer, Reddit

• 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)

Desirable

• We are looking for a Senior Software Engineer to join the Site Defense team within Reddit’s Infrastructure organization
• Site Defense is responsible for protecting Reddit at internet scale—serving 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 Reddit’s availability, performance, and trust
• 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 team’s 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