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Crucible
Tech Stack
TypeScriptNext.jsNode.jsExpressDockerTurborepoPostgreSQLPrismaTailwind CSS
Description
Acompetitive-programmingjudgewithacodeexecutionenginebuiltentirelyfromscratch,withnoJudge0orthird-partyrunner.UserssolvealgorithmicproblemsinPython,JavaScript,orJavaandsubmitsolutionsthatarecompiledandexecutedagainsthiddentestcasesinsideisolatedDockercontainers.EachsubmissionreturnsagradedverdictsuchasAccepted,WrongAnswer,TimeLimitExceeded,MemoryLimitExceeded,RuntimeError,orCompileError,alongwithper-testoutputandexecutiontiming.Everysubmissionrunsinalocked-down,disposablesandboxengineeredtosafelyexecuteuntrustedcodeatscale.
Key Contributions & Role
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Designedandbuiltafrom-scratchcodeexecutionenginethatcompilesandrunsuntrustedsubmissionsinsideephemeralDockercontainers,isolatedwithnetworkblocking,memorycaps,CPUquotas,PIDlimits,andaread-onlyfilesystem.
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Hardenedthesandboxagainstrealattackssuchasforkbombs,infiniteloops,andoutputfloodsusingahost-sidekill-switchtimerandastreamingoutputcap,witheveryrunnerexecutingasanon-rootuserfordefenceindepth.
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Architectedadeclarativelanguageregistrydrivingagenericcompileandrunpipeline,makingsupportforanewlanguageasingleconfigentryratherthananenginechange.
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Builtacodegenerationlayerthatsynthesizesstdinandstdoutharnessesfromstructuredproblemdefinitions,souserssubmitonlyafunctionbodyinsteadofafullprogram.
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Engineeredafail-fastgradingpipelinewithJSONdeep-equalitycomparisonthatisimmunetowhitespaceandorderingdifferences,plusapriority-orderedverdictresolvermatchingproductionjudgebehaviour.
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StructuredthesystemasaTurborepomonorepocleanlyseparatingtheRESTAPI,theasyncgradingworker,andareusablesandboxpackage,withasubmit-and-pollRESTAPIandaNext.jsfrontendforbrowsingproblems,editingcode,andviewingliveverdicts.
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Haveaprojectinmind?
subhajitguchhait04@gmail.com