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README.md
Converge Sync Service
Your Task
Fix the race in refreshToken that logs users out under load.
Context
Converge serves ~12k requests per minute across five regions. The auth middleware holds a per-session mutex, but the lock is released before the refresh promise settles.
When a parallel request arrives mid-refresh, it fires another refresh. The winner's token overwrites the first, and every request carrying the superseded token is rejected.
Reproduce with pnpm test:load auth.race — five concurrent clients, one session, expect all to succeed.
Problems
Output
Terminal
Ports
Claude Code v2.0.0Sonnet 4.6 · ~/converge
OpenRound AI·Hey Sarah! Welcome to your OpenRound.
Take a moment to read through the README before you start.
Sarah Marshall· typing▎
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AUTH-347High
Fix the token refresh race condition
backendauthAssigned: Sarah Marshall
Summary

Concurrent API calls trigger simultaneous token refreshes, causing 401 cascades. Fix the race condition and add retry logic.

Codebase
▾ src/services/
auth.ts
session.ts
▾ src/middleware/
refresh.ts
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openround · terminal
Sarah Marshall·just now
Implement the OAuth2 PKCE flow for mobile clients
────────────────────────────────
OpenRound AI·typing
I'll start by reading the existing auth service in src/services/auth.ts to understand the current flow...
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Sarah Park
Senior Engineer · Full Stack
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Walk me through why you chose property-level CRDT over OT here.
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SM
Sarah Marshall
Senior Software Engineer · Full Stack
82
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!AUTH-347In Progress
Add OAuth2 PKCE flow
Implement authorization code flow with PKCE for mobile clients...
2 subtasks · 1 comment

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March 2026
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claude code
❯ Fix the race condition in token refresh
I'll analyze the auth service to find the race condition...
Editing 3 files...
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terminal
✓ OAuth flow implemented
✓ Token refresh working
✓ PKCE challenge verified
✓ All 12 tests passing
Build succeeded · 847ms

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