Sunho's Dev Blog

Why I Ditched Apple's Foundation Model

Sat, 03 Jan 2026 12:00:00 +0000

Why I Ditched Apple’s Foundation Model

When Apple finally unveiled its intelligence strategy, the promise was intriguing. Free, light-weight, strong, and free on-device model? Sounds very promising. As Apple describes it:

The Foundation Models framework allows developers to create new intelligence features that protect users’ privacy and are available offline, all while using AI inference that is free of cost.

On paper, this is the holy grail: Privacy-first, zero-inference-cost, and offline-capable.

So I jumped in immediately. I mean, who doesn’t like free stuff? I attempted to build a document analysis feature using Apple’s ecosystem, but after weeks...

No Fine-Tuning, No Problem: Building 4 AI Features with AWS Well-Architected

Tue, 30 Dec 2025 12:00:00 +0000

No Fine-Tuning, No Problem: Building 4 AI Features with AWS Well-Architected

Building production-ready generative AI applications requires more than just picking a model and writing prompts. It demands a structured approach that considers business value, technical feasibility, and long-term sustainability.

I used the AWS Well-Architected Generative AI Lens as my framework—a six-phase lifecycle that forces you to think before you build.

In this post, I’ll walk through each phase and show how I applied this framework to build four AI features for FlowSpace—an assignment management app for students and educators.

The...

Why I Chose Lambda Over Amazon Bedrock AgentCore for Our AI Backend

Sun, 28 Dec 2025 12:00:00 +0000

Introduction

AWS launched Amazon Bedrock AgentCore, an agentic platform for building, deploying, and operating AI agents securely at scale. With promises of up to 8-hour runtimes, built-in session memory, and I/O-aware billing that doesn’t charge during wait times, it seemed like the obvious choice for our AI backend.

But after careful analysis, we went with AWS Lambda instead.

Here’s why—but first, let me explain what we’re building.

What We’re Building: FlowSpace

FlowSpace is a desktop application that helps students who struggle with task management stay on top of their assignments.

The Problem

Students often face...

Nexus CLI Open Source Project

Fri, 18 Jul 2025 19:53:12 +0000

The Birth of Nexus: A Unified CLI For a Fractured AI World

https://github.com/sunhome243/nexus-cli

TL;DR: Frustrated by juggling multiple AI CLIs, I built Nexus CLI during my Wondermove internship—a unified interface that lets you seamlessly switch between Claude and Gemini mid-conversation with MCP and with just Ctrl+S, all context preserved. It’s a POC beta with a lot of known issues, but it’s open source and available as @wondermoveinc/nexus-cli. Looking for contributors to help make it better!

Beta Notice: This is a proof-of-concept beta version...

Project Prism Wins First Place at Startup Competition!

Mon, 07 Apr 2025 22:27:57 +0000

🏆 We Did It! First Place at Denison Startup Competition!

I’m thrilled and incredibly honored to announce that Project Prism has won first place at the Denison University Startup Pitch Competition! As a software engineer and student entrepreneur, seeing the judges and audience react so positively to our AI-powered LED controller was an experience I’ll never forget.

First Place!

📺 Elevator Pitch: Project Prism in 60...

Prism v0 Alpha Launch

Wed, 19 Mar 2025 22:35:22 +0000

🎉 Celebrating a New Era of Smart Lighting: Alpha Launch of Our AI-Powered LED Strip Controller! 🌈

Have you ever invested in a costly smart LED strip, only to find yourself disappointed by basic features and limited automation capabilities? I experienced exactly that after buying a $50 "smart" LED strip. While manually configuring limited presets, I found myself questioning, "Is this really all a $50 smart light can do?"

Frustration sparked innovation. I imagined integrating advanced AI to create genuinely intelligent lighting—responsive to your mood, activities, and even anticipating your preferences. Rather than investing more into expensive products, I noticed...

Sprint 3 Development Note

Sat, 01 Mar 2025 22:35:22 +0000

What an incredible week for our little team! We’ve made massive strides across all fronts, particularly in backend development where we’ve nearly wrapped up all core functionality. Let’s dive into what each of us has accomplished this sprint.

Sunho’s Backend Progress

I made huge progress this week with a major milestone for our backend infrastructure! I nearly completed all functionality development and set up an automated deployment pipeline. Here’s what I pulled off:

Lambda Functions Development & Optimization

Pattern to AI Lambda (the one we renamed from “Surprise Me”): I got this working beautifully - it now...

Sprint 2 Development Note

Sat, 01 Mar 2025 22:35:22 +0000

It’s already the second sprint of our development journey. Let’s dive into the progress we’ve made and the goals we aim to achieve in the upcoming sprint.

New Team Members

We are excited to introduce our new team members!

Joohyung Kim

Role: Founder / Market Research Specialist
Education: Denison University ‘26
Major: Economics
Strengths: Market Research, Business Development

Taemin Lee

Role: Frontend Developer
Education: Denison University ‘27
Major: Computer Science
Strengths: JavaScript, Frontend Development

We are thrilled to go on this journey with our amazing team!

Backend Progress

It was...

Prism Project Architecture

Sat, 22 Feb 2025 22:35:22 +0000

Overview
Key Requirements & Considerations
High-Level Architecture Diagram
AWS Components
Detailed Flow
1. Arduino WebSocket Connection
2. Frontend REST Request for Voice Commands
Security and Trade-offs
Future Enhancements
Frontend Requirements
Backend Requirements

Overview

This document describes the MVP (Minimum Viable Product) architecture for an IoT voice command application. The goal is to rapidly develop a low-cost, serverless solution that allows users to:

Register and connect their Arduino devices via Wi-Fi (using a UUID).
Send voice commands (up to...

Sprint 1 Development Note

Sat, 22 Feb 2025 22:35:22 +0000

This is the first development note for AI LED controller. For now, I am the sole developer for this project, but starting from next week, we will have more team members for market research and frontend developments.

Let’s get started!

1. Simplified Architecture Overhaul

Original Project Architecture

The initial architecture was too complex for an MVP, resembling a production-level design. Given our development timeline, we simplified it.

Key Changes

Removed RDS

Security Concerns: RDS must be placed in a private subnet, meaning that Lambda must also be in a private subnet...

Lean Canvas (v.1.0)

Fri, 21 Feb 2025 22:35:22 +0000

Lean Canvas: AI-Powered LED Strip Controller

Transform any cheap, ordinary LED strip into a smart, AI-driven lighting system—without paying a hefty $20/month or buying an expensive new smart LED kit.

Problem
Customer Segments
Unique Value Proposition
Solution
Channels
Revenue Streams
Cost Structure
Key Metrics
Unfair Advantage
Additional Action Items (TODO)
Conclusion

1. Problem

Limited Functionality & High Cost: Existing smart LED strips (e.g., Apple HomeKit-compatible) are pricey yet offer little more...

Sunho's Dev Blog

Why I Ditched Apple's Foundation Model

Why I Ditched Apple’s Foundation Model

No Fine-Tuning, No Problem: Building 4 AI Features with AWS Well-Architected

No Fine-Tuning, No Problem: Building 4 AI Features with AWS Well-Architected

The...

Why I Chose Lambda Over Amazon Bedrock AgentCore for Our AI Backend

Introduction

What We’re Building: FlowSpace

The Problem

Nexus CLI Open Source Project

The Birth of Nexus: A Unified CLI For a Fractured AI World

Project Prism Wins First Place at Startup Competition!

🏆 We Did It! First Place at Denison Startup Competition!

📺 Elevator Pitch: Project Prism in 60...

Prism v0 Alpha Launch

Sprint 3 Development Note

Sunho’s Backend Progress

Lambda Functions Development & Optimization

Sprint 2 Development Note

New Team Members

Joohyung Kim

Taemin Lee

Backend Progress

Prism Project Architecture

Table of Contents

Overview

Sprint 1 Development Note

1. Simplified Architecture Overhaul

Key Changes

Removed RDS

Lean Canvas (v.1.0)

Lean Canvas: AI-Powered LED Strip Controller

Table of Contents

1. Problem