Live coding prep
How I'd actually warm up for a live coding round: short problems, no autocomplete, one framework, one platform, talking out loud.
What You'll Learn
- Simulate real-time coding sessions under time pressure
- Practice solving short coding tasks without relying on autocomplete
- Explain your reasoning and decisions clearly while coding
- Learn to balance speed with clarity
Why live coding matters
I bombed a live coding round early in my career. The task was to write a small function that grouped an array by a key, and my mind went blank on reduce. I sat there for two minutes, typing nothing, while the interviewer waited politely.
That moment taught me more than any tutorial.
Live coding isn't only about passing interviews. It's a honesty check. No autocomplete, no AI assistant, no twelve documentation tabs open. Just you and an empty file.
In real projects I use all those tools, and so should you. But once in a while, stripping them away tells you the truth:
- Do you actually know the basics, or has autocomplete been writing them for you?
- Can you still build a small component from scratch when nobody's holding your hand?
- Do you stay calm when the silence stretches?
Here's the thing. Live coding practice isn't really about interviews. It's about knowing your skills stand on solid ground when the tools are gone.
Step 1: Practice without autocomplete
Autocomplete is great for your day job. In interviews it trips you up, because you start typing a function name, the popup suggests something close-but-wrong, and you accept it without thinking.
Turn it off for 30 minutes a day. Or use an online editor that doesn't have it.
Then solve short problems. The ones I keep coming back to:
- Reverse a string
- Find the first non-repeated character in a string
- Implement a debounce function
- Render a list in React with filtering and empty plus error states
About frameworks. Pick the one you actually use at work and stop hedging. For me that's React, because that's what outsourcing clients ask for. Build a modal in it. Build a search input with debounce in it. Build a dropdown that closes when you click outside. Those are the components clients actually care about.
(If your company is a Vue or Angular shop, swap React out and don't apologise. The interview asks about the framework you're paid to write.)
Step 2: Explain while you code
Don't type silently. In real interviews, silence feels like confusion, even when you're calmly thinking.
Here's a line I actually said in a round last year, while building a small list filter:
"Okay, I'm going to start with the dumb version. Filter the array on every keystroke, no debounce, no memo. Once it works, I'll see if it needs to be smarter."
The interviewer relaxed. Not because the code was clever, but because she knew where I was going and that I'd come back to optimise. That's what they're listening for.
Practice this on your own. Solve a problem out loud, alone, with nobody watching. It will feel ridiculous the first time. Do it anyway.
Clear explanations often matter more than perfect code. Interviewers want to see your mind at work.
Step 3: Simulate interview conditions
Set a timer for 30 to 45 minutes. Pick one problem. Commit to it like it's the real thing.
Don't pause. Don't Google every detail. Don't switch tabs to check Twitter.
For UI tasks I open Frontend Mentor. That's it. I don't rotate between five platforms. One platform, used consistently, beats five platforms used once each. The Frontend Mentor easy tier mirrors live coding tasks closely enough that I've stopped looking elsewhere.
Step 4: Review and adjust
After each session, write one line in a notebook.
The one I've been writing for years is this: "What did I look up that I should already know?"
That's it. Not a list of feelings, not a self-assessment grid. One sentence. If the same thing shows up three weeks in a row, that's your next study topic. Mine was array methods for about six months. Now it's regex.
Consistency beats intensity. Three short sessions per week are better than one exhausting 4-hour grind.
What I'd do this Sunday
If you want a concrete homework, here it is. This Sunday morning, 30 minutes, no autocomplete, build a search input with a debounced filter against a small list. Use the framework you're paid to write at work. Talk through it out loud, even though nobody's listening.
Send me what you got. I read every message that comes in, and I'll tell you the one thing I'd change.
Next lesson we'll go into system design rounds, which is the part most people skip and then regret in the room.
Additional Resources
These are the two platforms I actually open when I want to warm up before a live round. One for UI muscle, one for keeping the logic side from rusting.
Frontend Mentor Easy Challenges
This is the one I'd open first. The challenges look exactly like what a client drops on you in a live round, a small card, a form, a list with a filter.
https://www.frontendmentor.io/challenges?difficulty=1&type=free
LeetCode Easy
I'm not a LeetCode person. But one easy problem a week keeps the logic side warm, which is enough for most frontend interviews I've sat in.
https://leetcode.com/problemset/all/?difficulty=EASY

