How We Match Problems to Companies

The method behind AlgoArena company patterns: what we measure, what we deliberately will not claim, and where the limits are.

AlgoArena Team5 min

Jul 28, 2026Vibecoding

Vibecode Something, Keep It, Let People Play It

We extracted the assessment IDE into a standalone builder, gave it a public showcase where anyone can play and fork what you make, and added self-serve practice assessments. The loop is the point.

AlgoArena Team4 min

Jul 25, 2026Assessments

A Replay Should Show What the Candidate Actually Saw

Session replay is only evidence if it reflects the candidate's real screen. Two fixes: one continuous timeline that follows the candidate across questions, and an honest band for the time they spent orchestrating agents.

Eli Young4 min

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Jul 22, 2026 AssessmentsReuse Beats Regenerate: Teaching Recruiting Copilot to Check the Shelf First

Eli Young4 min Jul 20, 2026 EngineeringPolish Is a Routing Problem

Andy Luu4 min Jul 17, 2026 VibecodingAn Agent Editor Built to Be Read Twice

Andy Luu8 min Jul 17, 2026 ClassroomAn Educator Assistant That Shows Its Work

AlgoArena Team7 min Jul 16, 2026 AssessmentsHow to Assess Developers Who Code With AI

Eli Young15 min Jul 12, 2026 ResearchRepairing a Problem Bank at Catalog Scale

AlgoArena Team6 min Jul 8, 2026 AssessmentsShared Agent Workspaces Need Evidence, Not Ceremony

Eli Young8 min Jun 24, 2026 Interview PrepStress Is the Skill: Why 5,000 Solved Problems Won't Get You Hired

Eli Young4 min Jun 23, 2026 PracticeArena 90 and the Ghost Ladder

Eli Young4 min Jun 23, 2026 ResearchAuditing the Arena 90 Campaign Path

AlgoArena Team7 min Jun 22, 2026 AssessmentsAI-Native Assessments Need Evidence, Not Theater

Eli Young8 min Jun 22, 2026 ResearchThe Five-Competency AI-Native Scoring Model

AlgoArena Team6 min

Field stories

Research and evidence

Repairing a Problem Bank at Catalog Scale

How we judged every stored solution against every stored test across the full catalog, arbitrated whether the tests or the solutions were wrong, regenerated expected outputs by consensus, and shipped checkers for problems with many valid answers.

Read

Auditing the Arena 90 Campaign Path

How the 90-node campaign was pinned to existing problems, test-count coverage, topic balance, and a stable curriculum contract.

Read

The Five-Competency AI-Native Scoring Model

How assessment scoring moved from a raw score toward public competencies for problem solving, planning, AI direction, verification, and workflow autonomy.

Read

Ghost Replay Eligibility Without Publishing Raw Labels

The shipped gates that decide whether a completed run can become a self ghost, join the human ghost pool, or enter the solution bank.

Read

View all research

Changelog

AssessmentsJuly 8, 2026

Build skill people can inspect.

Start free Meet with the team

How We Match Problems to Companies

Vibecode Something, Keep It, Let People Play It

A Replay Should Show What the Candidate Actually Saw

Field stories

Reuse Beats Regenerate: Teaching Recruiting Copilot to Check the Shelf First

An Agent Editor Built to Be Read Twice

An Educator Assistant That Shows Its Work

How to Assess Developers Who Code With AI

Research and evidence

Repairing a Problem Bank at Catalog Scale

Auditing the Arena 90 Campaign Path

The Five-Competency AI-Native Scoring Model

Ghost Replay Eligibility Without Publishing Raw Labels

Changelog

Recruiter fit controls and Discord identity

Course catalog, quizzes, and ranked stability

Shared agent workspace and attribution

Verification proofs and lifecycle emails

Build skill people can inspect.

How We Match Problems to Companies

Vibecode Something, Keep It, Let People Play It

A Replay Should Show What the Candidate Actually Saw

Field stories

Reuse Beats Regenerate: Teaching Recruiting Copilot to Check the Shelf First

An Agent Editor Built to Be Read Twice

An Educator Assistant That Shows Its Work

How to Assess Developers Who Code With AI

Research and evidence

Repairing a Problem Bank at Catalog Scale

Auditing the Arena 90 Campaign Path

The Five-Competency AI-Native Scoring Model

Ghost Replay Eligibility Without Publishing Raw Labels

Changelog

Recruiter fit controls and Discord identity

Course catalog, quizzes, and ranked stability

Shared agent workspace and attribution

Verification proofs and lifecycle emails

Build skill people can inspect.

AlgoArena Blog

How We Match Problems to Companies

Vibecode Something, Keep It, Let People Play It

A Replay Should Show What the Candidate Actually Saw

Field stories

Reuse Beats Regenerate: Teaching Recruiting Copilot to Check the Shelf First

An Agent Editor Built to Be Read Twice

An Educator Assistant That Shows Its Work

How to Assess Developers Who Code With AI

Research and evidence

Repairing a Problem Bank at Catalog Scale

Auditing the Arena 90 Campaign Path

The Five-Competency AI-Native Scoring Model

Ghost Replay Eligibility Without Publishing Raw Labels

Changelog

Recruiter fit controls and Discord identity

Course catalog, quizzes, and ranked stability

Shared agent workspace and attribution

Verification proofs and lifecycle emails

Build skill people can inspect.

AlgoArena Blog

How We Match Problems to Companies

Vibecode Something, Keep It, Let People Play It

A Replay Should Show What the Candidate Actually Saw

Field stories

Reuse Beats Regenerate: Teaching Recruiting Copilot to Check the Shelf First

An Agent Editor Built to Be Read Twice

An Educator Assistant That Shows Its Work

How to Assess Developers Who Code With AI

Research and evidence

Repairing a Problem Bank at Catalog Scale

Auditing the Arena 90 Campaign Path

The Five-Competency AI-Native Scoring Model

Ghost Replay Eligibility Without Publishing Raw Labels

Changelog

Recruiter fit controls and Discord identity

Course catalog, quizzes, and ranked stability

Shared agent workspace and attribution

Verification proofs and lifecycle emails

Build skill people can inspect.