# Sebastian Kolosa > Senior Software Engineer at Intuit Location: San Francisco, California, United States Profile: https://flows.cv/sebastiankolosa ## Work Experience ### Senior Software Engineer @ Intuit Jan 2024 – Present | San Francisco, California, United States Full stack software engineer on the QuickBooks CRM team ### SWE IV @ Credit Karma Jan 2023 – Jan 2024 | San Francisco Bay Area Backend engineer on the home team ### SWE III @ Credit Karma Jan 2021 – Jan 2023 | San Francisco Bay Area ### SWE II @ Credit Karma Jan 2020 – Jan 2021 | San Francisco Bay Area ### Software Engineering Intern @ Credit Karma Jan 2019 – Jan 2019 | San Francisco, California - Architected an Apollo GraphQL client for the UK product ecosystem in TypeScript, setting the standard for all future GraphQL developments. - Updated the entire UK app React frontend to interface with the new GraphQL client through reusable GraphQL fragments. - Developed a modular GraphQL scalar validation framework in TypeScript used to validate all UK app GraphQL network traffic. - Led engineering workshops and presentations to disseminate GraphQL architecture knowledge and onboard engineers. ### Mobile Engineering Intern @ PagerDuty Jan 2018 – Jan 2018 | San Francisco Bay Area - Utilized MVVM, Dependency Injection (Dagger 2), and the Observable Pattern (RxJava 2) within the Kotlin/Java Android application to deliver new features and user experience improvements in a contemporary, decoupled, and testable manner. - Led architecture initiatives for the company's iOS application to ensure long-term maintainability, simplicity, and scalability for the app. Built a Clean Swift Architecture app, conducted a company seminar to walk through it, and wrote up technical documentation to present Clean Swift as a viable architecture pattern for PagerDuty's iOS application. ### Mobile Engineering Intern @ PagerDuty Jan 2018 – Jan 2018 | Toronto, Ontario, Canada - Spearheaded the re-architecture of multiple sections of the company's iOS application with the Protocol-Oriented Programming paradigm, significantly reducing application boilerplate / duplicate code while optimizing code readability, testability, and scalability. - Presided over engineering meetings to scope and discuss the technical implementation of new iOS and Android feature initiatives. - Contributed to the implementation of live-updates throughout the iOS and Android applications by use of WebSockets, enabling urgent incident information to reach stakeholders in a rapid and proactive manner. - Increased the code coverage of the iOS application by 12% via writing exhaustive unit, integration, and snapshot tests for all application improvements and new feature developments. ### Software Engineering Intern @ TribalScale Jan 2017 – Jan 2017 | Toronto, Ontario, Canada - Implemented numerous features and bug fixes for major cruise line's Objective-C application that has 20k+ daily active users. Features developed include cruise guest organizer user interface and general app interface changes. Bugs fixed include ship time to iOS system time syncing using internal iOS clocks and rescheduling local notifications against user system time changes. - Piloted feature and bug discussions with external cruise line team and directed a number of weekly demonstrations of features built. - Constructed chat system message failure flow using Core Data and XMPPFramework, allowing users to resend or delete messages that failed to send due to the current XMPP limitations of the third party chat server. ### iOS Engineering Intern @ TD Jan 2016 – Jan 2016 | Waterloo, Ontario, Canada - Developed a high-priority, currently confidential Swift app to the MVP as part of a small Scrum team. - Took complete ownership of the TD Family Allowance (Objective-C app) child savings breakdown feature. - Implemented social sharing authentication logic (Apple Touch ID) within TD Family Allowance. - Engaged in stand-ups, retrospectives, and sprint planning, as well as feature validation with UX designers. ### iOS Engineering Intern @ Pixelbot Jan 2016 – Jan 2016 | Toronto, Ontario, Canada Developed the iOS beta version of a pre-existing android application that streamlines condominium services such as dog walking and dry cleaning. Implementations would include integrating login systems and service requests. Google, Facebook, and native login systems were developed, as well as the option of merging the corresponding accounts. The dog walker service request was also implemented. The application was developed using Xcode 7 and Swift 2. New features and user interface elements such as the dog walker service request and a native login system were also developed for the android application using Android Studio and Java. The back-end system was further developed using PHP and SQL with phpMyAdmin. ### Full-Stack Engineering Intern @ Ark Paradigm Jan 2016 – Jan 2016 | Waterloo, Ontario, Canada Developed the front-end for the company website, alongside building upon existing back-end and control code. Other projects completed would include writing automation scripts that utilize the Crunchbase API, managing and conducting QA on the pre-existing and newly written code, and implementing various other HTML pages not yet included on the company's website. ## Education ### Bachelor of Applied Science (B.A.Sc.) in Systems Design Engineering University of Waterloo Jan 2015 – Jan 2020 ## Contact & Social - LinkedIn: https://linkedin.com/in/skolosa --- Source: https://flows.cv/sebastiankolosa JSON Resume: https://flows.cv/sebastiankolosa/resume.json Last updated: 2026-03-23