# Yiwen Xu

> Software Engineer at Block

Location: San Francisco Bay Area, United States
Profile: https://flows.cv/yiwenxu

My passion is to build new products and scaling of those systems using my software engineering skills and product sense. I have 6+ years industry software engineering experience. I worked on both applied machine learning and growth engineering at Block (formerly Square). I am focusing on Risk ML & AI (underwriting, fraud risk) currently. I delivered PSP solutions for enterprise merchant partners (e.g. Google, Visa, Mastercard), and I built the consumer lending product Pay Monthly from 0 -> 1.

At Amazon Lab126, I focused on designing and developing smart home features for Alexa devices using Android and Embedded Development skills. I have contributed to Local Voice Control features on multiple Alexa Echo devices.

Skills:
Programming Languages: Kotlin, Java, Python, C++, SQL
AI: MCP, LLM APIs, AI Agents
Software Development: AWS, SpringBoot, Docker, Kubernetes, Airflow, Kafka, React, JavaScript, Temporal, Linux, RabbitMQ, Git

## Work Experience
### Senior Software Engineer @ Block
Jan 2023 – Present
Risk Machine Learning (underwriting, fraud)
Lending System (0 -> 1 platform build, payment, installment calculation)
Enterprise Integration & Growth Engineering (PSP for enterprise merchants, lending adoption and revenue expansion)

### Software Engineer @ Block
Jan 2022 – Jan 2023

### Software Engineer @ Afterpay
Jan 2020 – Jan 2022
Acquired by Block (formerly Square)

### Software Development Engineer @ Amazon Lab126
Jan 2019 – Jan 2020 | Sunnyvale

### Machine Learning Intern @ airXsys
Jan 2018 – Jan 2018 | Sunnyvale
Computer Vision, Deep Learning, YOLO, OpenCV, CUDA, Multi-GPU Training, Google Cloud Platform, Multiprocessing Image Augmentation

### Research Assistant @ Huazhong Agricultural University
Jan 2014 – Jan 2015 | Wuhan, Hubei, China
Bioinformatics, Plant Molecular Biology


## Education
### Master's degree in School of Computer Science
Carnegie Mellon University
Jan 2017 – Jan 2019

### Biosystems Engineering
Auburn University
Jan 2016 – Jan 2017


## Contact & Social
- LinkedIn: https://linkedin.com/in/yiwen-xu1

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Source: https://flows.cv/yiwenxu
JSON Resume: https://flows.cv/yiwenxu/resume.json
Last updated: 2026-03-23