AccessZero friction
Zero candidate barrier
Candidates do not sign up, verify emails, or download desktop binaries. They open the link in any modern browser and start coding in under five seconds.
TeamsZero candidate friction
Live technical interviews without candidate setup friction
Send one link. Candidates join in their browser in seconds with zero logins, password resets, or IDE setup issues. Built for JavaScript & TypeScript interviews that measure real engineering judgment.
No candidate accounts requiredPrivate token-isolated guidesReal-time Monaco collaborationFree to use
pairlet.dev/interview/tech-screen-7x9
2 ConnectedInterviewer View (Protected)
Interviewer GuideHidden from candidate
LRU Cache Implementation
Assess doubly-linked list vs. Map ordering semantics for O(1) get and put operations.
Evaluation Rubric
Doubly-linked list + Map for O(1) ops
Correct eviction when capacity exceeded
Updates item recency on get() lookup
Suggested Follow-up
“How would you adapt this for multi-threaded access or support expiring TTL keys?”
Candidate typing
class LRUCache {
// Shared real-time Monaco workspace
private capacity: number;
private cache: Map<number, number>;
constructor(capacity: number) {
this.capacity = capacity;
this.cache = new Map();
}
get(key: number): number {
if (!this.cache.has(key)) return -1;
const val = this.cache.get(key)!;
this.cache.delete(key);
this.cache.set(key, val);
return val;
}
}
stdout: put(1, 1), get(1) => 1
All 4 test cases passedWhyEngineered for high hiring signal
No candidate sign-ups. No IDE setup lag. No lost code.
Replace awkward screen shares and heavyweight assessment portals with a clean, low-latency live interview room.
The traditional interview
Screen shares & heavy tools
Interviews delayed by password resets, broken local environments, or one-way screens where interviewers can only watch.
15 min wasted
on setup, binary installs, and link permissions
Where the signal gets lost
- Candidate registration barrierForcing candidates to create an account or install desktop software creates immediate anxiety and delay.
- One-way screen sharingYou can't jump in, write a test case together, or inspect syntax without interrupting the candidate's flow.
- Scattered notes and exposed rubricsInterviewers juggle tabs for evaluation questions, risking accidental screen sharing of answers.
- Lost code after the call endsCode disappears when the call disconnects unless someone remembers to take screenshots.
Pairlet for TeamsThe frictionless workflow
Pairlet
Send a single link. The candidate enters a display name and immediately accesses a full Monaco IDE with instant in-browser execution.
5 seconds
from link sent to first line of collaborative code
What your team gets
- Zero candidate accountsCandidates open the URL in Chrome, Safari, or Firefox and start coding immediately.
- Private interviewer guideToken-isolated rubrics, complexity cheat sheets, and hints visible strictly to the interviewer.
- Real-time Monaco collaborationLive multi-cursor editing with Yjs CRDTs — fast, reliable, and conflict-free.
- Read-only session lockOne-click 'End Interview' freezes the session so the exact code remains preserved for your hiring committee.
- Code review exercises includedEvaluate real debugging and PR review skills alongside standard algorithm tasks.
FeaturesDesigned for modern technical loops
Built for the way senior developers actually work
Everything required to run a high-signal technical screening with zero unnecessary ceremony.
PrivacyInterviewer only
Private interviewer guides
Only the interviewer sees the problem solution blueprint, expected time and space complexities, follow-up questions, and rubric checklist.
TasksReal world
Real-world code review rounds
Test PR review skills in addition to algorithms. Present realistic PRs with intentional flaws: N+1 queries, race conditions, memory leaks, and authorization bugs.
EngineWeb Worker
In-browser code execution
Run JavaScript and TypeScript code safely in a Web Worker sandbox with instantaneous stdout and stderr console output. No server compilation queue.
SyncYjs CRDTs
Collaborative Monaco editor
Powered by the same editor engine as VS Code. Real-time cursor presence, selection broadcasting, and low-latency synchronization with conflict-free CRDTs.
DebriefFrozen state
Read-only session lock
Click “End Interview” to lock the room to read-only for all participants. The candidate's code remains frozen for your team's post-interview evaluation.
LibraryReady to launch
View All 82 ProblemsPre-built tasks for engineering interviews
Database & PerformanceCode Review
Code Review: N+1 Database Queries
Review the following user profile enrichment service. Identify performance issues (specifically N+1 database query patterns), explain the architectural impact on database connection pools, and propose an optimized batching/joining solution.
JS / TS ReadyRun this as a live interview
Strings / Data Structureseasy
Valid Parentheses
Given a string `s` containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid. An input string is valid if: 1. Open brackets must be closed by the same type of brackets. 2. Open brackets must be closed in the correct order. 3. Every close bracket has a corresponding open bracket of the same type.
JS / TS ReadyRun this as a live interview
Arrays & Hashingeasy
Two Sum
Given an array of integers `nums` and an integer `target`, return indices of the two numbers such that they add up to `target`. You may assume that each input would have exactly one solution, and you may not use the same element twice.
JS / TS ReadyRun this as a live interview
BlueprintHigh signal in 45 minutes
The 45-Minute Technical Interview Loop
A structured, repeatable format that yields clear hiring signal while respecting the candidate's time.
00–05 min
Join & Context
Share the link. Candidate joins with a display name in 5 seconds. Walk through problem context and expectations.
05–30 min
Live Problem Solving
Candidate implements or reviews code. Observe decomposition, edge case awareness, and technical communication.
30–40 min
Edge Cases & Complexity
Discuss time & space trade-offs, race conditions, alternative architectures, and refactoring opportunities.
40–45 min
Lock & Debrief
Answer candidate questions, click “End Interview” to lock code permanently, and finish evaluation notes.
ComparisonDirect feature breakdown
Pairlet vs. Traditional Interview Setups
Why engineering teams replace clunky screen shares and heavy enterprise platforms with Pairlet.
| Capability | Pairlet | Screen Share / Zoom | Legacy Enterprise Tools |
|---|---|---|---|
| Candidate Account | None (open & code) | None | Mandatory registration |
| Setup Time | 5 seconds | 10–15 min (IDE setup) | 5–10 min |
| Shared Editing | Real-time Yjs CRDTs | One-way screen only | Laggy or restricted |
| Code Review Tasks | Built-in PR review library | Manual repo checkout | Rare / abstract puzzles only |
| Interviewer Privacy | Token-isolated guides | Separate notes doc | Mixed inside UI |
| Pricing | Free | Meeting subscription | Per-seat licensing, annual minimums |
FAQFrequently asked questions
Questions & Answers
Does the candidate need an account or credit card?
No. Candidates simply open the URL you share. They enter a display name and immediately access the shared collaborative workspace without signing up.
Can candidates see interviewer hints or answer guides?
Never. The interviewer guide is protected by an interviewer-only session token stored securely in your browser. The candidate's view strictly contains the problem description and collaborative code.
Can I bring our own custom interview problems?
Yes. When creating a room, choose “Custom Problem” to paste your own description, examples, test scenarios, and starter template in JavaScript or TypeScript.
What happens when the interview is finished?
Clicking “Confirm & End” freezes the session and makes the editor permanently read-only. Both you and the candidate can review the final code, but no further edits can be made.
Get StartedZero setup required
Ready to run better technical interviews?
Create a room in 10 seconds. Select a pre-built task or use your own custom problem.