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Part of the bootcamp
Concurrent programming with asyncio is one workshop inside Backend Engineer Bootcamp: Go from Zero to Hero.
See the full path with mentor reviews and a portfolio outcome.
Stop sprinkling async def and hoping for speed. Learn how the event loop actually runs your code, run slow API calls in parallel, protect shared state with locks, and tear the process down without losing work.
Engineers are learning here from
Run slow Whisper and LLM calls concurrently, hand off background work, and tear down cleanly using FastAPI lifespans. Master asyncio primitives, locks, semaphores, and graceful shutdown.
Run slow Whisper and LLM calls concurrently, hand off background work, and tear down cleanly with FastAPI lifespans.
What you'll ship
What you'll learn
Curriculum
The async mental model
Build the right intuition for why async exists, how the event loop runs your code, and when async is the wrong tool
Concurrency primitives
Use await, gather, and create_task to actually run things in parallel
FastAPI integration
Wire async patterns into a real FastAPI service with lifespans, background tasks, and an executor for sync code
Synchronization
Protect shared state with asyncio.Lock and bound concurrency with asyncio.Semaphore
Shipping async services
Ship FastAPI services that drain in-flight work on shutdown and tell you what they were doing across await boundaries
Who it's for
who keep adding async def everywhere and still see requests pile up under load
whose endpoints feel slow because every call runs serially
who need to understand the event loop before bugs appear in production
FAQ
No. We start from why blocking calls hurt a single-threaded event loop and build up to gather, locks, and semaphores. Comfortable Python and basic FastAPI knowledge are enough.
The asyncio primitives are framework agnostic. The lifespan and dependency examples use FastAPI because it is the most common async Python web framework today, but the concepts transfer directly to Starlette, Quart, and async Django views.
For I/O-bound work like waiting on Whisper or an LLM API, asyncio gives you thousands of concurrent in-flight tasks for the cost of one thread. We cover when to reach for threads or processes instead, including run_in_executor for blocking libraries.
Every concept maps to a real workshop file. You see the FastAPI Whisper service and the Telegram bot per-session lock pattern, then practice the same primitives yourself.