Backend Software Engineer, TikTok Live Recommendation Infrastructure

About the Team Live-stream is a new and rapidly growing business that aims to bring joy to end users and allow more influencers to make an impact among their followers. And it's essential to pick the "right" live-stream for the "right" audiences. Our Live-stream Recommendation Infra team is responsible for building up and optimizing the infrastructure for such recommendation systems, so as to provide the most stable and best experience for our users. We work closely with applied machine learning engineers and build scalable systems to support all kinds of innovative algorithms and techniques. Responsibilities - Design and build backend systems that support large-scale recommendation workloads, including training, inference, and data pipelines. - Develop robust and efficient model infrastructure, including distributed training pipelines and low-latency inference serving. - Architect and improve data pipelines to enable efficient collection, preprocessing, and offline feature engineering for recommendation and ranking models. - Collaborate closely with ML engineers and researchers to productionize models and integrate them into the TikTok Live recommendation stack. - Drive performance optimization and cost-efficiency across training, inference, and data workflows. - Ensure system robustness, scalability, and maintainability in high-traffic live streaming scenarios. Minimum Qualifications: - Bachelor's degree or above in Computer Science, Engineering, or related technical field. - At least 3 years of experience in strong programming skills in C++, Go, or Java, and scripting experience in Python. - Solid experience in distributed systems and backend service development. - Hands-on experience with ML infrastructure, including model serving, inference optimization, or large-scale training systems. - Proficiency in building and maintaining data pipelines such as Spark, Flink, Kafka, Hadoop, or similar. - Strong problem-solving skills, with the ability to work in fast-paced, collaborative environments. Preferred Qualifications: - Experience working with recommendation systems, ranking, or personalization platforms. - Familiarity with deep learning frameworks such as TensorFlow, PyTorch. - Knowledge of cloud-native environments (Kubernetes, container orchestration). - Experience in performance optimization for large-scale, low-latency systems. - Prior experience in live streaming, content delivery, or real-time systems is a plus.