# Jonathan Tan > Senior Software Engineer | Ex-Microsoft Location: Santa Clara, California, United States Profile: https://flows.cv/jonathantan2 I like big data ## Work Experience ### Software Engineer @ Meta Jan 2024 – Present | Menlo Park, California, United States ### Senior Software Engineer - T&S / Data Engineering @ OpenSea Jan 2022 – Jan 2023 Developed robust systems for content moderation, fraud detection, and abuse prevention. ☛ Implemented both near-real-time and batch automated detection systems to protect customers from scam which identified and addressed over 1 million fraudulent entities. ☛ Developed a single-source-of-truth entity state manager using Postgres and DynamoDB which enabled flexible treatment strategies, and improved scalability and auditability. ☛ Led a small team of engineers in collaboration with product manager to build an internal tooling platform using FastAPI and Retool to standardize agent workflows, empower agent investigations, and enable overriding automated actions. ### Software Engineer II - Product Ads @ Microsoft Jan 2020 – Jan 2022 | Sunnyvale, CA Developed and maintained Spark and Hadoop data pipelines responsible for preparing advertiser data for serving. ☛ Successfully designed, developed, and promoted a unified image crawling and processing solution for all of Microsoft Ads. This service is leveraged by new ads initiatives and enabled experimentation for data science teams. ☛ Engaged in collaborative efforts with partner data science teams on multiple image enhancement projects, spanning from experimentation to production phases. ### Software Engineer I - Product Ads @ Microsoft Jan 2018 – Jan 2020 | Sunnyvale, California, United States Developed and maintained Spark and Hadoop data pipelines responsible for preparing advertiser data for serving. ☛ Led initiatives to scale the Image Crawling & Processing infrastructure, enhancing robustness and reliability to efficiently process 100TB+ of data and 100M+ events daily. This effort also reduced the E2E latency by 76% and reduced storage costs by 40%. ☛ Initiated and led the development of a React & ASP.NET web application for tracking Product Ads status and metadata which drastically reduced support investigation times by 50%. ### Course Grader - Intermediate Data Structures & Algorithms @ University of California, Riverside Jan 2017 – Jan 2017 | Riverside, CA As a course grader, I helped grade assignments and exams of undergraduate students in the Intermediate Data Structures & Algorithms course. ### Undergraduate Researcher - Home Analytics @ University of California, Riverside Jan 2017 – Jan 2017 | Riverside, CA The goal of the Home Analytic's research group is to analyze real estate in the United States of America to find correlations between the sales prices of homes and the locations of major businesses. I was tasked with developing single and multi-threaded web crawlers in Java to build a rich data set for later analysis. ### Software Engineer Internship @ Sorenson Engineering Inc. Jan 2017 – Jan 2017 | Yucaipa, CA Sorenson Engineering is a major provider of micro-technology solutions for aerospace, electronics, medical, dental, military/defense, and other industries. Here, I was privileged to work on the brilliant Technology Engineering team. My responsibilities here included... ☛ Initiating and leading the development of a TwinCat3 PLC’s HMI application, written in C# and WPF, to improve HMI customization ability and enable more features. ☛ Working closely with the Director of the Technology Engineering department to design an efficient database schema for the company. ☛ Developing re-usable and robust Structured Text function blocks, simplifying the process of communicating data between TwinCat3 PLCs and MySQL Server, and TwinCat3 PLCs and vision systems. ☛ Beginning the development of the machine monitoring web application. ### President @ Epsilon Iota Sigma Jan 2016 – Jan 2017 | University of California, Riverrside Epsilon Iota Sigma is an Academic & Career-based Fraternity located at the University of California, Riverside. We, as an organization, strive for excellence in all areas and work together to create a nurturing environment which challenges every brother to grow as individuals. The best way to describe the mentality of this organization is with one simple quote: "Why not 11/10?" As President, I oversaw the direction of the fraternity and acted as the primary representative by coordinating meetings with general members, the executive board, and campus administrators. ### Vice President of Internal Affairs @ Epsilon Iota Sigma Jan 2015 – Jan 2016 | University of California, Riverside ### Software Engineer Internship @ Kelley Blue Book Jan 2016 – Jan 2016 | Irvine, CA Kelley Blue Book is a vehicle valuation and automotive research company, widely accepted to be the leader of this area by both consumers and members of the automotive industry. My time here gave me the pleasure of working with some of the brightest minds that I have ever met, showing me that software engineering is not only what I love, but what I want to do. As part of the Vehicle Information Management Systems (VIMS) team, I worked in a scrum development environment to re-write a legacy system with modern best practices and design patterns such as MVVM and Repository. ### Volunteer Leader @ Methodist Hospital of Southern California Jan 2011 – Jan 2013 | Methodist Hospital of Southern California ☛ Organized and led quarterly team meetings of 20+ members ☛ Aided the Volunteer Coordinator in the interview and evaluation process of incoming volunteers ☛ Provided support to hospital patrons ☛ Retained extensive knowledge on hospital policies to provide better customer service ## Education ### Bachelor’s Degree in Computer Engineering University of California, Riverside ## Contact & Social - LinkedIn: https://linkedin.com/in/jonathan-tan-o27 --- Source: https://flows.cv/jonathantan2 JSON Resume: https://flows.cv/jonathantan2/resume.json Last updated: 2026-04-01