--- title: Building a SaaS using Agentic Coding - Part 3 | daily.dev description: Part 3 of a series building an AI video generator SaaS using agentic coding. The session covers adding CLI flags for theme, duration, and quality; refactoring... canonical: https://daily.dev/posts/building-a-saas-using-agentic-coding---part-3-azjm7e6bl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Building a SaaS using Agentic Coding - Part 3 | daily.dev og:description: Part 3 of a series building an AI video generator SaaS using agentic coding. The session covers adding CLI flags for theme, duration, and quality; refactoring... og:url: https://daily.dev/posts/building-a-saas-using-agentic-coding---part-3-azjm7e6bl og:image: https://api.daily.dev/og/posts/azjM7E6bl.png og:image:alt: Building a SaaS using Agentic Coding - Part 3 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. # Building a SaaS using Agentic Coding - Part 3 **[Web Dev Cody](https://daily.dev/sources/webdevcody)** · 27 min read · 0 upvotes · 0 comments ## Summary Part 3 of a series building an AI video generator SaaS using agentic coding. The session covers adding CLI flags for theme, duration, and quality; refactoring a 600-line generate script into modular service files with mockable interfaces; adding Vitest unit tests; integrating multiple text-to-video models (WAN 2.2, Veo, Cling) via FAL AI with a model registry pattern; and handling per-model duration bucketing differences. The author also reflects on UX decisions around model selection for casual vs. power users and documents run outputs as JSON for later cost analysis. ## Full article daily.dev links to this article rather than hosting it. 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