Content Moderation Panel Development for Mobile Apps
Users upload photos, write comments, send messages — and some of this content violates rules: spam, fraud, inappropriate images, personal data of third parties. Without moderation tools, support teams drown in complaints, and problematic content lives for hours before manual review. Moderation panel — internal tool that transforms chaos of reports into a manageable queue.
What's Included in a Moderation Panel
Not "a list of all content," but a priority queue. Moderator opens the panel and sees:
- Content with flags: user complaints, automated checks triggered, report threshold exceeded
- Sorting by severity: CSAM/violence — highest priority, spam — lowest
- Queue status: how many items waiting, average review time
Key moderator actions: approve, delete, temporarily hide, ban author, escalate to senior moderator.
Automatic Pre-Filtering
Manual review of every content piece doesn't scale as audience grows. Automation removes obvious violations and reduces team load.
Images. Google Cloud Vision API SafeSearch Detection — returns probabilities for categories ADULT, VIOLENCE, RACY, MEDICAL, SPOOF. Auto-delete threshold: ADULT = VERY_LIKELY. For additional CSAM checks — PhotoDNA via Microsoft Azure Content Moderator. PhotoDNA works with hashes of known material, doesn't analyze content itself — technically and legally this is an important distinction.
AWS Rekognition Moderation Labels — alternative to Google Vision, convenient if infrastructure is already on AWS.
Text. OpenAI Moderation API (text-moderation-latest) — free, fast, handles: hate, harassment, self-harm, sexual, violence. Perspective API from Google — for toxicity in comments, works well across multiple languages. Custom regex for phone numbers, emails, URLs (spam patterns).
Built-in Platform Tools. For chats: SendBird, Stream Chat, Cometchat — all have built-in moderation. If app is already on one of these platforms, some work is already done.
Moderation Queue Architecture
Incoming content → automatic check (async, doesn't block publishing) → if auto-approve: published immediately, if auto-reject: deleted with author notification, if uncertain: enters manual review queue.
For non-obvious cases — delayed publication. Content visible only to author until it passes review. Works for new accounts or users with violation history.
Database for queue:
moderation_queue
id uuid PK
content_id uuid FK (polymorphic: post, comment, image, profile)
content_type enum
priority int (calculated based on violation type and number of reports)
auto_score jsonb (API check results)
status enum (pending, reviewed, auto_rejected, auto_approved)
assigned_to uuid FK (moderator, nullable)
created_at timestamptz
reviewed_at timestamptz
Moderator Interface
Mobile panel (if needed) or web interface. For mobile app with UGC — usually web panel for moderators: faster to open content, more convenient for queue work.
Key UI elements:
- Queue list with content preview and flag reason
- Single click — view full content with context (author profile, report history)
- Keyboard shortcuts for quick actions (approve/reject without mouse)
- Statistics: how many processed per shift, percentage of confirmed reports
Keyboard shortcuts — not a detail. Moderator processes hundreds of items per day; difference between "clicking buttons with mouse" and "J/K for navigation, A for approve, D for delete" is speed.
Decision History and Appeals
Every moderator decision is logged: who, when, what action, why. Important for: analyzing moderator quality, user appeals, legal requests.
Appeals system: user contests decision → task enters appeals queue → senior moderator reviews with full context. Not mandatory, but useful for reducing negative reviews.
Notifications and SLA
Priority content must reach moderator within N minutes. Alerts when queue overflows (more than X items waiting longer than Y minutes) — to Slack/Telegram/email of moderation team. PagerDuty for critical categories (potential CSAM, threats to life) — on-duty moderator gets push notification anytime.
Timeline: basic panel with manual moderation of report queue — 1–2 weeks. Complete system with automatic pre-filtering via Vision/Moderation API, role-based moderator levels, decision history and appeals — 4–8 weeks. Cost calculated after analyzing content types, volumes, and existing infrastructure.