# Huanjun Ji > Senior Software Engineer II at affinity.co Location: Austin, Texas, United States Profile: https://flows.cv/huanjun Backend Senior Software Engineer with 8 years of experience building distributed systems applications in Ruby on Rails, Javascript, and Python, while utilizing distributed systems technologies such as Kubernetes, Kafka and Datadog. ## Work Experience ### Senior Software Engineer II @ Affinity.co Jan 2024 – Present | Austin, Texas, United States ### Senior Software Engineer @ Checkr, Inc. Jan 2021 – Jan 2024 | San Francisco Bay Area • Led the development of multiple critical path projects for leading fair chance background checks company driving $690 million of annual revenue using Ruby on Rails, Sinatra, Python, Go, Snowflake, Kafka, Datadog, and Kubernetes • Worked with engineer teams to guide and enable systematic modularization of monolith codebase(650K LOC) • Worked on project to systematically upgrade monolith codebase(650K LOC) from ruby 2.6 to 3.1 and rails 5 to 7 • Worked with 20 engineer teams and infra team to facilitate e2e microservice connections for cloned sandbox environment • Tech lead for onboarding new criminal search vendors e2e from API testing and documentation, to code integration, to audit testing of vendor quality. Also developed and documented the onboarding process for repeatability with future vendors • Led project to onboard 6 microservices owned by team to Okteto, a kubernetes based dev environment platform • Tech lead for development of comprehensive system for detection, triage and resolution of stuck background check reports that resulted in a 30% reduction of total stuck report count • Owned development of improved deep learning language model for criminal charge categorization by adding new features to model using fastai library and AWS Sagemaker • Owned data analysis and code development of major cost savings features with estimated annual savings of $300K • Mentorship role for several new engineers ### Software Engineer @ Checkr, Inc. Jan 2019 – Jan 2021 | San Francisco Bay Area ### Software Engineer @ Credible Jan 2018 – Jan 2019 | San Francisco Bay Area ### Software Engineer @ Transcriptic Jan 2016 – Jan 2018 | Menlo Park ### Production Control Supervisor @ Ameditech Inc. (Alere Inc.) Jan 2013 – Jan 2015 • Implementation of quantitative metrics and KPIs leading to continuous process improvement. • Manage supplier performance and relationship with domestic and overseas vendors. • Successful negotiation of replenishment conditions with various vendors (VMI, kanban) • Value stream mapping of high volume product line, leading to various kaizen events. • Capacity analysis across entire supply chain leading to capacity improvement projects. • Supervision of warehouse and planning personnel in maintaining production schedule adherence, inventory replenishment and implementation of various efficiency improvements. • Standardization of planning tasks through implementation of instruction guides, task lists, and delegation of standardized tasks to warehouse and planning personnel. • Managing verification and implementation of raw material molds to meet increased demand. ### Production Planner @ Ameditech Inc. (Alere Inc.) Jan 2012 – Jan 2013 | Greater San Diego Area • Performed daily tasks such as order scheduling, order shipment, and inventory replenishment. • Developed various excel based systems for planning functions such as demand projection, production schedule planning, material requirement planning, and inventory replenishment. • Managed production efficiency improvement kaizen events that led to a $300k annual reduction of labor costs. • Expediting of purchase orders as well as production work orders to meet customer needs. • Point of contact for customer inquiries, managing customer relationship and on time delivery. ### QC Technician @ Ameditech Inc. (Alere Inc.) Jan 2012 – Jan 2012 • Performed QC incoming raw material inspection and product testing at various test phases. ## Education ### Fullstack Coding Bootcamp in Computer Software Engineering App Academy Jan 2015 – Jan 2016 ### Bachelor's Degree in Biology, General UC San Diego Jan 2009 – Jan 2011 ## Contact & Social - LinkedIn: https://linkedin.com/in/huanji --- Source: https://flows.cv/huanjun JSON Resume: https://flows.cv/huanjun/resume.json Last updated: 2026-03-22