Second Brain

Tech Stack

React 19TypeScriptNode.jsExpressMongoDB AtlasVector SearchOpenAI EmbeddingsDockerAWS EC2Tailwind CSS

Description

AnAIpoweredpersonalknowledgebasethatletsyoucapturetweets,YouTubevideos,andarticlesintoonesearchablelibraryandretrievethembymeaningratherthanexactwords.Everysaveditemisenrichedwithitsrealcontent,includingvideotranscriptsandfullarticletext,andembeddedasavector,soasearchlike"memorysafesystemslanguage"surfacesyourRustbookmarkevenwhenthosewordsneverappearinthetitle.Userscanfilterbytype,tagtheircontent,andpublishareadonlysharedbraintoanyonethroughasinglelink.

Key Contributions & Role

◆
BuiltsemanticsearchendtoendusingOpenAItextembedding3smallwith1536dimensionvectorsandMongoDBAtlasVectorSearch,runningavectorsearchaggregationover100nearestneighborcandidatesandreturningthetop10rankedbycosinesimilarity,scopedperuserthroughanindexleveluserIdfilter.
◆
EngineeredacontentextractionpipelinethatpullsYouTubetranscriptsandparsescleanarticletextwithMozillaReadabilityandJSDOM,soembeddingscaptureactualcontentinsteadofjusttitles,withgracefulfallbacksthatkeepsavingusableevenwhenanupstreamAPIfails.
◆
ImplementedstatelessJWTauthenticationwithbcrypthashing,Zodrequestvalidation,andanormalizedtagsystemusingatomicupsertstostayduplicatefreeunderconcurrentwrites.
◆
Designedapublicbrainsharingfeaturethatgeneratesarandomslugforanunauthenticated,fullyrenderedreadonlyview,revocableinstantlywithatoggle.
◆
DevelopedthefrontendasaReact19andReactRoutersinglepageappwithTailwindCSSv4,customhooksforauth,content,andsearch,500msdebouncedlivesearch,andnativeYouTube,tweet,andarticlepreviews.
◆
ContainerizedfrontendandbackendwithmultistageDockerbuildsanddeployedtoAWSEC2behindannginxreverseproxythatservestheAPIandappfromoneoriginwithnoCORS,plusahealthcheckandautoreconnectloopforresilience.