LinkedIn Professional Network  ·  View 05 of 30  ·  2 · People and journeys

Journey — Creator, Draft to Reach

The supply side of the feed, and why the first hour after posting shapes media, fan-out and ranking.

Editable source SVG draw.io All views
Creator posts weekly, often with video Goal — Share a short video and see it land with my network Trigger — Something worth saying, usually on the move Done when — Real reactions in the first hour, and numbers to learn from 1 · Draft 2 · Publish ◆ moment of truth 3 · First hour ◆ moment of truth 4 · Engage 5 · Measure What they do Writes, adds a video Taps Post Watches for reactions Replies to comments Opens analytics Where Composer Composer Feed Notifications Post analytics How it feels Proud Fine Deflated Behind the glass Media upload · Ambry Content service Espresso Fan-out · Samza FollowFeed Comments ATC Pinot Where it hurts Upload dies on bad wifi Stuck on processing Reach looks like zero Notification flood Numbers a day late What would fix it Resumable signed upload Text live, media later Early signals in seconds Aggregated alerts Real-time analytics How we know Upload success Post p95 ≤ 300 ms Time to first view Reply rate Analytics freshness User Journey — Creator, Draft to Reach The first hour is the trough: the ranker learns from early engagement a post cannot get while it is invisible. v 1.0 · owner Product + Enterprise Architecture · date 2026-09

What the trough decides

  • Text publishes at once. Media goes straight to Ambry on a signed URL and is swapped in when MediaReady fires, so processing never blocks the post
  • Early engagement flows through Kafka into the ranker's features in seconds, so the first hour is not spent invisible
  • ATC aggregates comment and reaction notifications, so a successful post does not become a flood

Numbers

  • Post creation p95 under 300 ms
  • PostCreated to follower inbox within seconds for normal authors
  • Post analytics fresh within a minute, served from Pinot

Where the set answers it

  • Upload and processing: view 21
  • Distribution and ranking: views 15 and 16
  • Notifications: view 20 · analytics freshness: view 11
◀  Journey — Job Seeker, Search to Status All views Journey — Recruiter, Search to First Reply  ▶
Solution Architecture v1.0 · LinkedIn's own stack in LinkedIn-run colos · Enterprise Architecture · 2026-0905-journey-creator