ericwoo_kr 
The Moment You Know You Have a Query Problem Everything works great until it doesn’t. I’ve watched dashboards look perfectly healthy — p50 latency under 50ms, error rate flat — right up until a table crosses 500k rows and suddenly specific endpoints start timing out. The failure mode is never gradual. One day it’s fine, … Read more
Introduction: Diving Deeper Than Just a Sandbox Back in 2026, settling for a single e-commerce platform feels like trying to pick a favorite cloud in the sky. Shopify has made its name known by providing a strong foundation for online businesses, but it’s not always the perfect fit for every store out there. Hidden fees, … Read more
Introduction: Cutting to the Chase By 2026, Canva and Visme have cemented themselves as powerhouse tools in the DIY design market, widely adopted by startups that need to roll out snappy visuals without a dedicated design team. At first glance, Canva might seem like the obvious winner, given its aggressive expansion into AI-driven design suggestions … Read more
The Problem: Your React Tests Are Either Slow, Brittle, or Both Snapshot tests are a trap. I know because I walked straight into it. You write a toMatchSnapshot() call, feel productive, commit it, and three weeks later you’re approving a 400-line snapshot diff because someone changed a button’s aria-label. The test isn’t telling you anything … Read more
The Problem: Your Flask App Works Locally, Now What? Here’s the math that pushed me off EC2: a t3.micro instance runs you roughly $8-10/month whether it serves zero requests or ten thousand. Lambda charges $0.20 per million invocations plus compute time billed in 1ms increments. If your API gets sporadic traffic — a webhook receiver, … Read more
The Real Problem: Microsoft Office Licensing in Education Hits Different Mid-year budget cuts to Microsoft 365 are not a hypothetical — I’ve watched this happen to multiple school districts and community colleges. One day teachers have OneDrive syncing lesson plans, the next week IT is fielding panicked emails because accounts are locked and nobody can … Read more
The Situation That Made Me Pick a Side Four people. Zero dedicated designers. A founder, two engineers (including me), and a product manager who’d used Sketch once in 2019. We had two weeks to get a clickable, investor-ready prototype built for a B2B SaaS dashboard — the kind where you tap through three or four … Read more
My Stack After Burning Through a Dozen Tools Most “best tools for data science” lists are written by someone who watched a YouTube tutorial, got a Jupyter notebook running, and called it research. I know because I wrote one of those lists in 2022 and I’m embarrassed by it now. The tools I actually depend … Read more
Understanding REST APIs in the Context of Mobile Apps When we talk about REST APIs for mobile apps in 2026, we’re tapping into the backbone of modern mobile architecture. A REST API, short for Representational State Transfer, is an interface that allows different software applications to communicate with each other. Given the explosion of mobile … Read more
Why I Stopped Recommending Jira to Every Startup I Work With The breaking point was a Tuesday afternoon. I’d just joined a 6-person seed-stage startup as a fractional CTO — two backend devs, one frontend, a designer, a PM, and a founder who kept jumping in on tickets. Simple team. Clear scope. We needed to … Read more