Junfeng Jin
Education
Carnegie Mellon University
Aug 2023 — Dec 2024M.S., Mobile and IoT Engineering
Beijing University of Posts and Telecommunications
Aug 2019 — Jun 2023B.E., Telecommunications Engineering with Management
Queen Mary University of London
Aug 2019 — Jun 2023B.E., Telecommunications Engineering with Management (First-class)
Experience
GoogleMachine Learning Engineer
Apr 2025 — Present- Trained distilled models on zero-ground-truth events to fix overprediction.
- Cut training delay with synthetic labels and auxiliary towers.
- Built end-to-end user signal pipeline from ad request to serving.
ByteDanceSoftware Engineer
May 2024 — Apr 2025- Launched Customer Service Agent for 20,000+ shops in 8 markets.
- Built Graph RAG on Neo4j with multi-agent automation.
- Designed Intention Router and memory layer for 5+ teams.
- Merged 30+ microservices into a Python framework; latency -40%.
Alibaba CloudSoftware Engineer Intern
Jun 2023 — Aug 2023- Built Java/gRPC microservices for a console with 80K DAU.
- Shipped Spring Boot + MySQL backend; launch effort -70%.
- Designed Java/GraphQL BFF layer; request efficiency +30%.
- Built React/TypeScript/Redux frontend.
DeepLang AISoftware Engineer Intern
Nov 2022 — Mar 2023- Scaled Django/PostgreSQL on AWS to 200K+ MAU.
- Extended Amazon EMR for big data; cloud cost -38%.
Projects
Raily FriendsPersonal Project
2025- Shipped highway-matching MVP in 8 hours, concept to prod.
Highway-matching MVP shipped in 8 hours.