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Production-Ready Python Serverless Web APIs


After weeks of intensive research and a dozen small projects, you have now decided to use Serverless Framework to develop a huge production Python web API and deploy it to AWS Lambda. But how exactly do you transition from the simple app structure you saw in tutorials to the mature production-ready form you need? That's exactly the same problem we faced over the past 24 months. In this talk, I will share my team's experience on how we solved this problem.

Directory Structure - how to arrange your Python code * Controllers, Handlers, Helpers, Models, Gateways: Building your app's directories for single responsibility between components * Multi-repository vs. Single-repository approach: The pros and cons * Lambdalith (monolith Lambda) vs. Lambda Functions

Python development in the context of AWS Lambda * Don't be afraid to use Exceptions - monitoring your app's performance with the error count in Lambda * Use print statements deliberately - using CloudWatch to create searchable logs and metric filters to create alarms out of your logs * Use AWS Lambda Layers to package Python packages with OS Native dependencies (i.e psycopg2, cryptography)

Tools of the trade: Leveraging AWS Services to reduce the development you have to do in-house and focus on the features that make your client's business stand out * Lambda - as your compute engine. * API Gateway - for your routes and data validation * DynamoDB - as your NoSQL database * SQS - for your queue service * Parameter Store - for storing configuration * Step Functions - orchestrating workflows in AWS * Cognito - using AWS' ready-made authentication service * ECS - when your workloads reach past 15mins, turn to ECS containers to finish the job

Black Belt Lambda: using Serverless Framework features to get ahead of Lambda's limitations and ensure best practices * Using AWS Layers * Prune your Lambda Applications regularly * Managing environment variables * Have a local environment

#PWC2022 attracted nearly 375 attendees from 36 countries and 21 time zones making it the biggest and best year yet. The highly engaging format featured 90 speakers, 6 tracks (including 80 talks and 4 tutorials) and took place virtually on March 21-25, 2022 on LoudSwarm by Six Feet Up.

More information about the conference can be found at:


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