· Swadhin Kumar · Software Development
When `sbt test` Is Secretly Single-Threaded
SBT's defaults run tests sequentially in a single JVM. On an eight-core box with a big suite, seven cores stay idle the whole run. The four settings that fix it.
Blog
Thoughts on AI development, software engineering, and technology.
- · Swadhin Kumar · productivity
Breaking up with JetBrains
I didn't quit JetBrains on principle. Claude Code plus git worktrees changed what I actually needed from an editor, and IntelliJ stopped fitting.
- · Swadhin Kumar · AI Development
From vibe coding to engineering management: making AI coding assistants actually work
Why I stopped treating Claude like a faster typewriter and started treating it like an engineer on my team.
- · Swadhin Kumar · Software Architecture
Modernizing a Production Frontend: 10x Faster Builds in 2 Weeks
Notes from migrating an active React app off Create React App and Turborepo to Vite, plus the React 18 jump that came with it.
- · Swadhin Kumar · Software Development
Stop learning frameworks. Start building things.
Framework expertise is the lowest-leverage skill. The concepts transfer; the syntax doesn't matter. Here's how I actually pick up new stacks.
- · Swadhin Kumar · AI Development
Claude Code's plan mode, after a few months of using it
Plan mode is the read-only switch in Claude Code that stops the agent from touching your files until you've reviewed its plan. After a few months I'm not going back to letting it just go.