Application service

Options by provider

The first option is what diagrams show for that provider.

Related concepts

Used in

• YouTube
  • Upload service — Accepts resumable chunked uploads and queues transcode jobs
  • Video service — Video metadata, playback manifests, view counts
  • Engagement service — Likes, comments and subscriptions
  • Search service — Queries the search index and ranks results
• Netflix
  • Playback service — Checks entitlement, picks the best edge servers and issues DRM licences
  • Catalogue service — Titles, artwork and regional availability
  • Profile & history service — Profiles, My List and resume positions
• Instagram
  • User & graph service — Profiles, follows, privacy checks
  • Post service — Creates posts, likes and comments; hands out upload URLs
  • Feed service — Merges pre-built feed entries with celebrity posts and ranks them
  • Fan-out workers — Push each new post into followers' feeds
  • Search service — User and hashtag search
  • Notification service — Turns activity events into notifications
• Twitter / X
  • Tweet service — Validates tweets and assigns Snowflake IDs
  • Timeline service — Reads cached timelines and merges celebrity tweets
  • User & graph service — Profiles and follow relationships
  • Fan-out service — Copies new tweet IDs into followers' timelines
  • Search service — Full-text search over recent tweets
• WhatsApp / Messenger
  • API service — Login, conversation list, history, groups
  • Offline notifier — Sends a push when the recipient isn't connected
• Uber
  • Location service — Updates the geo index and publishes driver positions
  • Matching / dispatch — Finds candidates, ranks by ETA, locks and offers to one driver
  • Trip service — Owns the ride state machine
  • Pricing service — Fare estimates with surge multipliers
  • Payment service — Charges riders and records payouts when a trip completes
• Amazon
  • Search service — Query parsing, ranking and facets
  • Catalogue service — Product details and prices
  • Cart service — Persistent carts
  • Order service — Creates orders and tracks status
  • Inventory service — Reserves and releases stock
  • Payment service — Authorises and captures payments idempotently
  • Fulfilment service — Picks a warehouse, creates shipments
• Payment gateway
  • Payment service — Runs the payment state machine
  • Processor router — Picks an acquirer and translates to its protocol
  • Card vault — Tokenises and detokenises card numbers inside the PCI zone
  • Ledger service — Posts balanced double-entry records
  • Webhook dispatcher — Delivers signed events with retries
• URL shortener
  • Shortener service — Creates links and serves redirects (stateless)
  • Key generation service — Hands out unused keys from a claimed range
• API rate limiter
  • Rate limiter — Matches the request to rules and runs the algorithm (gateway plugin or sidecar)
  • Backend APIs — The services being protected
  • Rules service — Validates and stores rule changes
• Search autocomplete
  • Suggestion service — Finds the shard for a prefix and returns its top-k
• Web crawler
  • Crawl scheduler — Adds seeds and re-queues pages that are due for a recrawl
  • Fetcher workers — Download pages with timeouts and size limits
  • Parser & link extractor — Extracts text, links and a content fingerprint
• Pastebin
  • Paste service — Creates, reads and deletes pastes
  • Key generator — Hands out unique random keys
• Dropbox
  • Metadata service — Commits file versions and serves change lists
• Google Maps
  • Places & geocoding — Text search with distance ranking; reverse geocoding
  • Routing engine — Shortest paths on the road graph with live weights
• WebSockets at scale
  • Backend services — Chat, notifications, live scores …
  • Fan-out router — Resolves recipients to pods
• Video calling (WebRTC)
  • Room service — Creates rooms, assigns an SFU, issues TURN credentials
  • Recording workers — Mix forked streams into a file (FFmpeg)
• BookMyShow
  • Catalogue service — Movies, venues and show times
  • Seat service — Seat maps and holds
  • Booking service — Turns a paid hold into a booking
  • Payment service — Charges and refunds idempotently
• MakeMyTrip
  • Search aggregator — Fans out to suppliers and merges results
  • Booking service — Creates bookings and tracks status
  • Payment service — Authorise, capture, refund
• Airline reservations
  • Flights & inventory — Schedules and seats per fare class
  • Reservations (PNR) — Creates and changes bookings
  • Check-in & boarding — Seat maps, boarding passes, gate lists
  • Flight operations — Status, delays, gates, aircraft swaps
  • Payment service — Charges and refunds
• Airbnb
  • Search service — Geo + filter query, then availability check and ranking
  • Listing service — Listing CRUD and photo uploads
  • Availability service — Calendars and date reservations
  • Booking service — Reservation lifecycle
  • Payments & payouts — Authorise at booking, capture, pay hosts after check-in
• NoBroker
  • Listing service — Create and update listings
  • Search service — Geo and filter search
  • Contacts & visits — Plan checks, contact unlocks, visit scheduling
  • Plans & payments — Subscriptions, rent payments, services
• Meeting scheduler
  • Calendar service — Create, update and expand meetings
  • Free/busy service — Merges busy intervals and finds common slots
  • Room booking — Claims rooms without overlaps
• Car rental
  • Availability search — Classes and prices per branch and dates
  • Pricing — Rates by season, demand and duration
  • Reservation service — Holds capacity and manages the rental lifecycle
  • Fleet service — Vehicles, assignment, maintenance
  • Payment service — Deposit holds and final charges
• Zomato / food delivery
  • Discovery service — Geo search and ranking of restaurants
  • Order service — Order lifecycle
  • Payment service — Charges, refunds, restaurant and rider payouts
  • Dispatch service — Picks a rider by distance, load and prep time
• Urban Company
  • Catalogue service — Services, prices, offers
  • Slot service — Computes available slots and places holds
  • Booking service — Confirms bookings and tracks jobs
  • Assignment service — Chooses the professional
  • Payments & payouts — Customer charges, professional payouts
• Porter / goods delivery
  • Pricing — Fare by vehicle, distance, time and demand
  • Order service — Order lifecycle
  • Dispatch — Finds and locks a driver, sends the offer
  • Payments & payouts — Charges, invoices, driver payouts
• Driver booking & fleet management
  • Booking service — Bookings and trip lifecycle
  • Dispatch — Matches bookings to available drivers
  • Driver management — Onboarding, KYC, shifts, compliance
• Practo / teleconsultation
  • Doctor search — Specialty, location and availability
  • Appointment service — Slots, holds and bookings
  • Payment service — Consultation fees and refunds
  • Records service — Prescriptions and reports with access control
• AstroTalk
  • Discovery — Lists astrologers with live presence
  • Session service — Starts, tracks and ends sessions
  • Wallet service — Balance, reservations and top-ups
  • Billing meter — Charges each minute; ends sessions on low balance
  • Top-ups & payouts — Wallet top-ups, astrologer payouts
• Quora
  • Q&A service — Questions, answers, comments
  • Vote service — Records votes and updates counters
  • Feed service — Assembles and ranks each user's feed
  • Search service — Search and duplicate detection
  • Fan-out workers — Push new content to topic followers' feeds
• LinkedIn
  • Profile service — Profiles and settings
  • Graph service — Connections and degree queries
  • Feed service — Collects and ranks posts
  • Jobs service — Job search, applications
• Buy now, pay later
  • Credit decision — Eligibility and approval at checkout
  • Credit & loans — Limits, loans, refunds
  • Payments — Merchant settlement, auto-debit, collections
• Stock brokerage
  • Order management (OMS) — Validates, tracks and routes orders
  • Risk management (RMS) — Margin, limits and exposure checks
  • Exchange gateway — FIX sessions with exchanges
• Live sports scores
  • Ingest service — Validates, orders and dedupes events
  • Scores API — Snapshots and history