My First Kiro App Was a Winner. Here’s How I’m Building a Monster

Description and use

The author explains how to build a complex AI assistant using Kiro’s features—Specs, Steering, Hooks, Property tests, MCP, Powers, Subagents, and Workflows—to reduce bugs and automate checks in solo development.

Problem

Building a complex assistant with many independent parts (inbox, calendar, meals, money) while working solo, risking bugs that only a team would catch.

Outcome

The author achieved a robust, self‑sufficient development workflow that mitigates solo‑developer pitfalls, enabling rapid, reliable iteration on a complex assistant.

Workflow

• Generate Specs to outline requirements, design, and tasks
• Create Steering docs and files to enforce scope and privacy rules
• Enable Memory to capture learning and conventions
• Add Hooks for automated checks and secret handling
• Write Property‑based tests derived from requirements
• Configure MCP & Powers for external docs and tools
• Define Subagents and Workflows for parallel and background tasks
• Run tests after each task via Hook
• Iterate until acceptance criteria met

Evidence

A year ago I was a fresh computer science grad starting my first big coding project. I built Denarii, an AI purchase advisor, with Kiro, and it was a winner at the Code with Kiro Hackathon.

Source

Franki is a friendly Frankenstein ghost who helps run your life. It's an avatar-first assistant you talk to, stitched together from parts that were never meant to fit: your inbox, your calendar, your meals and your money.

Source

Specs are the skeleton. A Kiro spec turns "build me X" into three documents you review before any code exists: requirements, a design and a task list.

Source

Hooks fire on events, like a tool about to run or a spec task finishing, and run either a shell command or an agent prompt.

Source

Property-based tests check the rules. In a Kiro spec, the design pulls testable properties out of your requirements.

Source

Subagents each run in their own context and in parallel, so research, implementation and review don't trip over each other.

Source