Security Software Engineer (TDR)

About the Team The Security Engineering team at ByteDance builds and operates the core systems that protect one of the world's largest internet platforms and its global user community. We tackle challenges that span threat detection and response (TDR), infrastructure protection, and the emerging frontier of AI and LLM system security — all at the scale of TikTok and ByteDance. Our engineers combine deep systems-building expertise with strong security fundamentals to deliver high-impact, production-grade solutions in a fast-paced, globally distributed environment. If you thrive on ownership, love solving ambiguous problems, and want your work to safeguard products used by billions, this is the team. - Design and build innovative threat detection, prevention, and response (TDR) systems that protect large-scale platforms, critical infrastructure, and globally distributed endpoints. - Drive the security of LLM-based systems and AI agent architectures — identifying novel attack surfaces, developing defensive frameworks, and ensuring the safe deployment of AI-powered products at scale. - Own the end-to-end lifecycle of distributed security systems operating across global regions — from deployment and capacity planning through production reliability, observability, and continuous iteration at scale. - Partner closely with cross-functional global teams to turn vague problem statements and emerging threat patterns into clear product requirements, and ship high-impact security capabilities on aggressive timelines.