Jacob Krajewski Email & Phone Number

Chicago, Il, Us

Chicago, Illinois, Us

• Pioneered the “Cloud Data Simulator” an efficient internal application that rapidly populates staging environments with large datasets, accurately replicating the shape of production data, and leveraging K6 to conduct traffic simulations that emulate typical usage patterns. This innovation not only reduces the required uptime for testing environments—thereby cutting operational costs—but also enabled the automation of schema change testing and API rate-limit determinations, saving extensive developer time previously lost to manual configurations. The simulator is a pivotal advancement, bolstering our ability to rigorously test software modifications, such as new features and performance upgrades, in conditions that closely mirror production.• Led the end-to-end system design and development of multiple Temporal Workflows to reconcile user data across services, ensuring consistent data propagation and eventual consistency. This solution addressed the lack of atomic transactions across our services and reduced the need for manual remediation when things fail.• Designed, Developed, and performance-tested REST APIs for our backend which utilize a combination of Java Play and Spring Services employing Test Driven Development techniques. Collaborated closely with stakeholders during the design process and conducted performance tests to optimize bottlenecks and set appropriate rate limits.• Created Jenkins CI/CD pipelines for provisioning staging environments and automated testing of new service versions. Ensured new builds were compatible with a variety of client applications before deploying to Artifactory.• Drove organizational changes to embed Test-Driven Development into our software development processes, fostering collaboration between developers and QA to ensure comprehensive test coverage for new and existing features.

Kansas City, Missouri, Us

• Implemented a cron job within an internal Spring application to automate checks for failed transactions between clients and their users, determining whether to retry the API requests.• Updated the front-end of an internal web application utilizing the MVVM architecture and the Knockout.js framework, enhancing the client onboarding process.

Chicago, Il, Us

• Learned software development techniques that are used in corporate settings to drive project deliverables