--- title: Porting a Code RAG system from Python to Go: What the AI... description: A detailed account of rewriting Kodit, a code RAG system combining BM25 and vector search, from Python to Go using Claude Code for AI-assisted migration. The... canonical: https://daily.dev/posts/porting-a-code-rag-system-from-python-to-go-what-the-ai-got-wrong-qa0y0xerp twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Porting a Code RAG system from Python to Go: What the AI got wrong | daily.dev og:description: A detailed account of rewriting Kodit, a code RAG system combining BM25 and vector search, from Python to Go using Claude Code for AI-assisted migration. The... og:url: https://daily.dev/posts/porting-a-code-rag-system-from-python-to-go-what-the-ai-got-wrong-qa0y0xerp og:image: https://api.daily.dev/og/posts/qa0Y0XErp.png og:image:alt: Porting a Code RAG system from Python to Go: What the AI got wrong og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Porting a Code RAG system from Python to Go: What the AI got wrong **[HelixML](https://daily.dev/sources/helixml)** · 11 min read · 1 upvotes · 0 comments ## Summary A detailed account of rewriting Kodit, a code RAG system combining BM25 and vector search, from Python to Go using Claude Code for AI-assisted migration. The author documents key architectural decisions and specific failures: the AI resurrected a deprecated snippets table by following dead code references, defaulted to burying everything in Go's internal/ package (blocking library use), scattered configuration across files, and implemented in-memory pagination. Multiple testing layers were required to catch issues—unit tests alone were insufficient, and a ranking comparison test revealed embedding truncation errors, an RRF off-by-one bug, and wrong embedding reads. The Go rewrite delivers a native client library, ~5x performance improvement, and cleaner architecture, but required constant human oversight to correct AI-generated architectural mistakes. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [RAG in Go: A Vulnerability Research Tool](https://daily.dev/posts/rag-in-go-a-vulnerability-research-tool-31hu4l2yd) · Ardan Labs · 3 upvotes · 0 comments --- Tags: [#python](https://daily.dev/tags/python), [#golang](https://daily.dev/tags/golang), [#rag](https://daily.dev/tags/rag), [#domain-driven-design](https://daily.dev/tags/domain-driven-design), [#claude-code](https://daily.dev/tags/claude-code) [View this post on daily.dev](https://daily.dev/posts/porting-a-code-rag-system-from-python-to-go-what-the-ai-got-wrong-qa0y0xerp) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Porting a Code RAG system from Python to Go: What the AI got wrong","url":"https://daily.dev/posts/porting-a-code-rag-system-from-python-to-go-what-the-ai-got-wrong-qa0y0xerp","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/porting-a-code-rag-system-from-python-to-go-what-the-ai-got-wrong-qa0y0xerp"},"datePublished":"2026-02-26T15:13:01.590Z","dateModified":"2026-02-26T15:13:28.579Z","description":"A detailed account of rewriting Kodit, a code RAG system combining BM25 and vector search, from Python to Go using Claude Code for AI-assisted migration. The...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/400c3868490a7984583644218deb4969?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/400c3868490a7984583644218deb4969?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"HelixML","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"HelixML","logo":"https://media.daily.dev/image/upload/s--AJkj-0fR--/f_auto/v1741272391/logos/helixml","url":"https://daily.dev/sources/helixml"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/porting-a-code-rag-system-from-python-to-go-what-the-ai-got-wrong-qa0y0xerp","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"python,golang,rag,domain-driven-design,claude-code","timeRequired":"PT11M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"HelixML","item":"https://daily.dev/sources/helixml"},{"@type":"ListItem","position":3,"name":"Porting a Code RAG system from Python to Go: What the AI got wrong"}]} ```