Yoonji Kwon is a UC Berkeley bioengineering graduate and community-focused caregiver currently working as a postpartum doula while pursuing goals in medicine. With seven years of experience spanning wet lab research, mentorship program leadership, K-12 education, and farm-based food access work, she combines technical rigor with hands-on community service. She also contributes to open-source AI infrastructure—working on high-profile projects like vLLM and SkyPilot—bringing backend, DevOps, and model-integration experience to scalable ML tooling. Comfortable both behind the scenes managing complex systems and at the bedside providing compassionate care, she excels at translating technical and medical concepts for diverse audiences. Her uncommon blend of bioengineering research, grassroots community engagement, and active involvement in ML infrastructure reflects a practical, service-driven path toward practicing medicine.
7 years of coding experience
3 years of employment as a software developer
Bachelor of Science - BS, Bioengineering, Bachelor of Science - BS, Bioengineering at University of California, Berkeley
A high-throughput and memory-efficient inference and serving engine for LLMs
Role in this project:
Back-end Developer
Contributions:2 releases, 1556 reviews, 1141 PRs in 1 year 9 months
Contributions summary:Yoonji's commits focused on adding core components to the vLLM project, specifically implementing support for the OPT language model. Their work involved defining classes for OPT learned positional embeddings and attention mechanisms, and creating a decoder layer and a complete decoder model compatible with HuggingFace weights. Furthermore, they integrated these components into a causal language model and a block module, demonstrating a focus on model implementation and integration within the project's architecture. The user also added the implementation of the sampling functionalities.
SkyPilot: Run AI and batch jobs on any infra (Kubernetes or 14+ clouds). Get unified execution, cost savings, and high GPU availability via a simple interface.
Role in this project:
Backend & DevOps Engineer
Contributions:266 reviews, 259 commits, 39 PRs in 11 months
Contributions summary:Yoonji primarily contributed to the project by fixing bugs, refactoring code, and improving the infrastructure. They addressed issues related to GPU availability checks, docker container management, and Azure image versions. The user also made updates to the CLI, and refactored the DAG optimizer. Furthermore, the user added configuration for W&B setup.
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Yoonji Kwon - Postpartum Doula at Doulas by the Bay