Submitty/Submitty
Mar 2026 – Jun 2026
2 Months active
Languages Used
JavaScriptPHPPython
Technical Skills
Automated TestingCypressJavaScript TestingPHPbackend developmentsoftware architecture
Preston Carman
PROFILE
Preston Carman
Worked on the Submitty/Submitty repository to enhance backend reliability and maintainability through targeted improvements in automated testing and configuration management. Addressed flaky Cypress tests by introducing robust date helpers and dynamic assertions, ensuring consistent test outcomes across time zones. Refactored the daemon job queue path to be configuration-driven, simplifying deployments and reducing hard-coded dependencies. Implemented startup-time JSON schema validation for autograding worker configuration, providing clear diagnostics and preventing runtime errors. Utilized JavaScript, PHP, and Python to deliver these solutions, with a focus on unit testing, backend development, and schema validation to improve system stability and administrator onboarding.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
3Total
Bugs
1
Commits
3
Features
2
Lines of code
263
Activity Months2
Your Network
49 peopleWork History
June 2026
1 Commits • 1 Features
Jun 1, 2026June 2026 monthly summary for Submitty/Submitty: Implemented startup-time validation for autograding_workers.json to prevent misconfiguration; startup now exits with a descriptive error if required fields are missing or have wrong types. This addresses cryptic KeyError/TypeError during the first job submission, improving reliability and reducing admin troubleshooting. Delivered a robust schema validation via load_autograding_workers_json() with existing jsonschema tooling (jsonschema==4.26.0) and no new dependencies; commit bd7cb0b536aa9df4c400d3cd215b4171e66bad93 contains the feature and tests. Added 8 unit tests covering valid/invalid configurations and error handling. Impact: faster onboarding of new worker machines, fewer runtime failures, and clearer diagnostics for administrators. Technologies demonstrated: Python, JSON Schema validation, unit testing with mocks, and config management for autograding shipper.
1 Commits • 1 Features
Jun 1, 2026June 2026 monthly summary for Submitty/Submitty: Implemented startup-time validation for autograding_workers.json to prevent misconfiguration; startup now exits with a descriptive error if required fields are missing or have wrong types. This addresses cryptic KeyError/TypeError during the first job submission, improving reliability and reducing admin troubleshooting. Delivered a robust schema validation via load_autograding_workers_json() with existing jsonschema tooling (jsonschema==4.26.0) and no new dependencies; commit bd7cb0b536aa9df4c400d3cd215b4171e66bad93 contains the feature and tests. Added 8 unit tests covering valid/invalid configurations and error handling. Impact: faster onboarding of new worker machines, fewer runtime failures, and clearer diagnostics for administrators. Technologies demonstrated: Python, JSON Schema validation, unit testing with mocks, and config management for autograding shipper.
June 2026
March 2026
2 Commits • 1 Features
Mar 1, 2026March 2026: Fortified CI stability and system maintainability for Submitty/Submitty. Key work included stabilizing the late-submission warning messages test by addressing popup visibility and timezone edge cases, introducing date helpers and dynamic assertions; and refactoring the daemon job queue path to be config-driven across multiple controllers, enabling easier configuration and deployments. These changes reduce test flakiness, minimize deployment risk, and improve maintainability and configurability across environments.
March 2026
2 Commits • 1 Features
Mar 1, 2026March 2026: Fortified CI stability and system maintainability for Submitty/Submitty. Key work included stabilizing the late-submission warning messages test by addressing popup visibility and timezone edge cases, introducing date helpers and dynamic assertions; and refactoring the daemon job queue path to be config-driven across multiple controllers, enabling easier configuration and deployments. These changes reduce test flakiness, minimize deployment risk, and improve maintainability and configurability across environments.
Activity
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Quality Metrics
Correctness100.0%
Maintainability93.4%
Architecture93.4%
Performance93.4%
AI Usage60.0%
Skills & Technologies
Programming Languages
JavaScriptPHPPython
Technical Skills
Automated TestingCypressJSON schema validationJavaScript TestingPHPbackend developmentsoftware architectureunit testing
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