# Karina Y.

> Senior Software Engineer at Pennymac Loan Services, LLC

Location: Denver Metropolitan Area, United States
Profile: https://flows.cv/karinay

The wildest cowboy-coder in the West and Junior Ranger in over a dozen National Parks

## Work Experience
### Senior Software Engineer @ PENNYMAC
Jan 2022 – Present | Remote
Tech Utilized: Python, Typescript, React, AWS

- Built upon and expanded existing AWS infra, including Lambdas, API Gateway, DynamoDB, SAM, CDK.
- Managed various microservices across multiple apps
- Implemented data validation and extensive tests to ensure functional interactions with internal and third party API's which increased test coverage across multiple repos by ~40%
- Worked alongside devops with multiple teams to help migrate 5 repos to trunk based pipelines
- Led major initiative to migrate an app out of a monorepo shared across multiple teams and delegated tasks to the appropriate team members
- Decreased code quality issues identified by SonarQube across multiple repos by up to 87%
- Provide technical guidance to devs across various teams and onboarding to new team members and managers
- Work closely with QA, UAT, and Product to resolve bugs
- Led design sessions with devs to address technical improvements
- Peer reviewed merge requests to mentor other engineers on best practices, team coding standards, shipping high quality code, and ensuring thorough test coverage

### Software Engineer @ PENNYMAC
Jan 2021 – Jan 2022

### Software Engineer @ 40 Years of Zen
Jan 2018 – Jan 2021
- Maintaining and expanding proprietary neurofeedback software in Meteor and React with MongoDB in conjunction with both OpenBCI hardware and proprietary hardware
- Work closely with staff neuroscientist to create accurate neurofeedback algorithms for optimal client experiences
- Maintaining custom Linux services and debugging stock system utilities where needed
- Designed and rebuilt the marketing website on Serverless AWS with React front-end and Node/Express REST API. This increased client inquiries by 300%
- Rewrote v1 of neurofeedback software’s front-end from Blaze to React to decrease code duplication
- Decreased graph load times by reducing time complexity of our algorithms. This sped up load times by ~95% (from multiple minutes to ~3 seconds)
- Re-architected server-side code for optimized security and consistency, established clear data models, secured methods by user role permissions
- Forked custom version of VisJS graphing software to fix existing bugs as well as add/expand on features more closely tailored to our app including integration with Web Speech API speech recognition software
- Other tech utilized: Redux, Raspberry Pi, SCSS, Bash, AudioContext, React-Bootstrap, Electron, React Native

### Software Developer @ Betagig
Jan 2017 – Jan 2017 | Greater Los Angeles Area
- Tech utilized: Linux, Meteor (web and Android builds), ReactJS, Node, Express, MongoDB.
- Worked closely with the CTO on a small team of 4 to rewrite code-base of entire app.
- Began work with Phase 1 of Betagig in MEAN stack before rewriting code-base for Phase 2 in Meteor, ReactJS, NodeJS, and MongoDB.
- Worked in all aspects of the code, wrote various CRUD operations, controllers, and had my hands in the server-side code and database architecture.
- Ran training sessions for dev team on front-end development and bootstrap best practices..
- Headed creation of app features from front to back, such as secure routing and company sign-up process.
- Created numerous reusable ReactJS components for use throughout the app for both functionality and consistency in UI.

### Software Developer @ Status Not Quo, Inc
Jan 2016 – Jan 2017 | Greater Los Angeles Area
- Tech utilized: C#, Razor, Kentico, AngularJS, HTML, LESS, Javascript, jQuery, LINQ, Entity Framework, and SQL Server Management Studio, Android Studio.
- Collaborated with engineering leadership, marketing, and executive management team to develop quality websites for our clients.
- Worked on various projects for companies such as Activision (Skylanders shop app), Interior Office Solutions (http://interiorofficesolutions.com), and LDI (https://landscapedevelopment.com).

### Full Stack Web Developer in Training @ Sabio - Engineering & Security Professionals
Jan 2016 – Jan 2016 | Greater Los Angeles Area
- Sabio is a coding bootcamp, my cohort was contract by the city of Santa Monica to create a prototype as part of our training.
- RapidRents is a civic app built in collaboration with the city of Santa Monica providing a wide range of tools to the residents looking for affordable and stable housing. I worked closely with Google API to build a variety of interactive customizable geo location and map features. The application has a user account management portal in which I built an e-mail service with SendGrid which enables quick and easy communications between current and prospective tenants and landlords. I also utilized AWS Cloud Storage for uploading, storing, and retrieving files throughout our system.

- Tools and languages: Visual Studio 2015, C#, .Net 4.5, MVC 5, WebApi 2.x, JSON Serialization, AJAX, IIS 7.5, SQL Server 2014, T-SQL, TFS, jQuery, Angular 1.4.x, Bootstrap 3.x, CSS3, Google Maps API, SendGrid, AWS, Attribute Routing & Trello. We followed agile development practices with daily stand-ups and regular product demo days with product stakeholders.


## Contact & Social
- LinkedIn: https://linkedin.com/in/karina-y

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