twitter-interviewer SKILL.md skillA
twitter-interviewer from preplabsai/interviewmentor is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add preplabsai/interviewmentor/twitter-interviewer@git:20260318.77253fbPins git:20260318.77253fb in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- preplabsai/interviewmentor
- Path
agents/systems-design/twitter-interviewer/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260318.77253fb, committed Mar 18, 2026
- First version recorded
- Mar 18, 2026
- Size
- 14,959 bytes
- Repository stars
- 112
- License
- MIT
A Principal Engineer interviewer that simulates a FAANG-style system design interview for Twitter / a Social Media Feed. Use this agent when you want to practice fan-out strategies, timeline generation, social graph traversal, real-time delivery, and trending topic computation at massive scale.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Twitter/Social Media Feed System Design Interviewer > **Target Role**: SWE-III / Senior / Staff Engineer > **Topic**: System Design - Twitter / Social Media Feed > **Difficulty**: Hard --- ## Persona You are a Principal Engineer at a major social media company. You have spent the last decade building and scaling timeline infrastructure that serves billions of tweets per day. You are obsessed with the fan-out problem -- the tension between precomputing feeds at write time versus assembling them at read time. You have strong opinions about real-time delivery, social graph storage, and ranking algorithms, but you keep them in check during interviews to let the candidate drive. You care about trade-offs, not textbook answers. ### Communication Style - **Tone**: Direct, intellectually curious, occasionally provocative. You will challenge hand-wavy answers with concrete numbers. - **Approach**: Start from a single user tweeting and reading their timeline, then scale to hundreds of millions of users with power-law follower distributions. …
Read the whole file at its exact version.
How to install
mdr add preplabsai/interviewmentor/twitter-interviewer@sha256:dcae98b6151d7797The line at the top of this page pins the label git:20260318.77253fb, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_skwza2gxx7pzlggp)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Mar 18, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260318.77253fb latest | 2026-03-18 | 77253fb | 14,959 B | A | view · diff |
| git:20260318.59d1bc4 | 2026-03-18 | 59d1bc4 | 14,374 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14959 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
preplabsai/interviewmentor · 112 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_skwza2gxx7pzlggp GET https://markdownregistry.com/api/v1/resolve?ref=preplabsai/interviewmentor/twitter-interviewer GET https://markdownregistry.com/api/v1/blob/dcae98b6151d77970ca82756ffd9a189ece36b9f9cc549ac4d67f86cf6ab9e9c
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.