← Back to jobsPosted (ATS) 1/8/2026, 12:04:40 PM Updated (ATS) 1/8/2026, 12:04:40 PM First seen by us 6/28/2026, 9:01:48 AM Last re-seen 8/22/2026, 10:30:15 PM Distinct job IDs 1 Open in parallel 1 Work locations 1 Cumulative days active 227 Stagnancy score 78.92 ATS job ID f07c1416-f126-4925-8606-5dd7c5a90f6f
GhostHigh-confidence zombie posting. HR is probably not actually hiring.
Senior Backend Software Engineer, AI Observability & Evals Platform (LangSmith)
LangChain · Engineering · San Francisco, CA
A posting in this role has sat open 227 days — well past the 90-day mark where an opening reads as a resume black hole rather than an active search.
Rotation timeline
Every ATS job ID we've matched to this same normalized title, oldest first. "Posted" is the date the ATS reports; "last confirmed open" is the last time we saw it live.
- Location
- San Francisco, CA
- Posted (ATS)
- Jan 8, 2026
- Last confirmed open
- Aug 22, 2026
- Open for
- 226 days +
Data provenance
- Source platform
- ashby
- Latest listing found
- https://jobs.ashbyhq.com/langchain/f07c1416-f126-4925-8606-5dd7c5a90f6f
- Stream ID
- 03e21cd7-42bc-42e8-b3f1-8ea6363830db