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New interviewAssistant

Who you're hiringSenior product engineer, first hire on payments The problem you're solvingSmall businesses lose revenue when card payments fail

AIMapping what a strong fit needsMatters most here

Recommended challenge

Recover failed payments

Growth customers churn after a failed card payment. Ship something that brings them back, in a real codebase, alongside AI agents and a small team.

Product IQBuild with AI agentsVirtual team75 min

Who you're hiringFounding backend engineer at a delivery startup The problem you're solvingCouriers lose signal, so customers see the wrong delivery times

AIMapping what a strong fit needsMatters most here

Recommended challenge

Offline-first courier tracking

Couriers lose signal mid-route, and customers see the wrong delivery times. Design how location data flows through the system, then build the core of it by hand.

System IQCode IQ60 min

Who you're hiringFull-stack engineer, early team at a clinic software startup The problem you're solvingClinics waste hours re-entering patient data across tools

AIMapping what a strong fit needsMatters most here

Recommended challenge

Patient intake import

Clinics re-type patient records from their old tools. Build a way to bring that data into the product, alongside an AI agent and the clinic team.

Product IQBuild with AI agentsVirtual team70 min

A realistic session

Our system generates high-signal problems and challenges designed to probe the qualities that matter most for the role and gauge each candidate's competence, so you see how they really work, not how well they've rehearsed.

Recover failed paymentsLive

Generated challenge

Recover failed payments

18% of Growth customers churn within a month of a failed payment. Ship something that brings them back, in the Ledgerly codebase, alongside AI agents and a small team.

Repoledgerly · 7 files

BoardSprint 14 · 6 tickets

TeamPM, payments engineer, support

CurveballRevealed mid-session

ProbesPrioritizationVerificationStakeholders

4 candidates 2 finished 2 working on it

MTMei TanakaFinished · 71 min
SOSam OkoroFinished · 78 min
AOAmara ObiBuilding with AI agents
JRJonah ReyesIn the virtual team

A report with evidence

Get an analysis of how each candidate works: the qualities they showed, how strongly, and the exact moments that prove it.

Amara Obi · reportRecover failed payments

Analysis

Strong product instincts and a natural collaborator. Checked the agent's work, but needed a nudge before testing against large accounts.

Product judgment06:40
System design14:10
Coding08:12
Working with AI19:30
Collaboration12:04

12:04 Asked Dana for the v2 rate limit before writing the client, then built backoff into the first version.

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Pricing coming shortly

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Start from a real problem, decide what's worth building, then build it. We evaluate how you prioritize, weigh value against effort, scope the work and defend your calls.

Product IQ · Failed paymentsInterviewer is listening

The problem

18% of Growth customers churn within a month of a failed payment.

ShipRetry email with a one-click card update
LaterFailed-payment dashboard for finance
CutSMS reminders

Value Effort Email Dashboard SMS

AIMost failed payments happen on mobile. Why cut SMS?

The email link works on mobile too. SMS adds cost and consent rules for a small lift, so I'd test it after launch.

System IQ

Sketch the system on a whiteboard while an AI interviewer challenges your thinking in real time, pushing on scale, failure and every tradeoff you make.

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Deep technical knowledge with exquisite taste. Solve problems from first principles, find your way around a real codebase, and think out loud while an AI interviewer probes your understanding.

Code IQ18:42 / 30:00 · No AI

On air

What happens to the window when you see a repeat?

Move the left edge past the last copy. Each index moves once, so O(n).

def longest_unique(s: str) -> int:    seen, left, best = {}, 0, 0    for i, ch in enumerate(s):        if seen.get(ch, -1) >= left:            left = seen[ch] + 1        seen[ch] = i        best = max(best, i - left + 1)    return best

● 4 of 4 tests passed · Python 3.14

Build with AI agents

AI agents are here to stay! Ship a real feature with AI agents in a virtual repository to see how effectively you can utilize the capabilities of a coding assistant and how well you can make the right decisions.

ledgerly · invoice exportWith AI

Explorer

▾ ledgerly

billing_client.py

clock.py

db.py

export.pyM

export_job.pyA

flags.py

models.py

▾ tests

test_export.py

export.py export_job.py billing_client.py

 41  page = billing.list_invoices( 42      acct.id, cursor=cursor, limit=100) 43  rows += db.invoices_for(acct.id) 44  cursor = page["next_cursor"]

You Line 43 reads the replica, which is a day behind. Dropping it.

Agent

Moved the export into a background job in export_job.py.

Paged with list_invoices, plus recent rows from the database so nothing is missed.

● Hidden checks 11 of 12

Work within a virtual team

Step into a virtual workspace that feels like your first day on-site. Pick a ticket, meet your teammates, dig through history and work out what the task really needs.

LLedgerly

▦Sprint 14 board

Channels

#general

#project-invoices3

#eng

#standup

Direct messages

TTolu1

AAda

DDana

Sprint 14 Ends Friday

To do

!LED-409SSO users can't log in after a reset

LED-418Invoice CSV exportYou

LED-415Payments suite is flaky in CI

LED-421Dark mode for the dashboard

A Ada in #project-invoices
Small add from finance: can the export include a Paid date column?

Pricing coming shortly

Stop hiring coders. Start hiring builders.

Coding has changed. Tech interviews are next.

Design the assessment

A realistic session

A report with evidence

Decide

Become the engineer every startup wants to hire.

Product IQ

System IQ

Code IQ

Build with AI agents

Work within a virtual team

The interview changed. Get ready for the real one.