Externship @ AWS | Crio Winter of Doing 2021

TLDR

• This externship was part of Crio Winter of Doing.
• I built a Task Scheduler which schedules and executes Lambda functions which are deployed on API Gateway (the complete problem statement can be found here).

Long version

Crio Winter of Doing was a learn-by-doing externship organized by Crio. The total duration of the externship was 6 weeks and I was shortlisted for this externship through a coding test and a mini project. There were multiple companies like Groww, Cred, AWS, Jumbotail, etc. which had their problem statements for the externship.

I liked the problem statement given by AWS the most since I had never worked on task scheduling and Lambda functions before. Here is the exact problem statement:

I spent the first 2 weeks planning each and every API and the overall architecture of the scheduler such that it's scalable and fault tolerant. I came across Celery and RabbitMQ during this phase and I realized that both of them will allow me to schedule any Python function.

So I ended up building a Flask application with a React.js frontend which would trigger a Lambda function given by the user at a given delay. The user can add/edit/delete tasks which are essentially HTTP requests for a Lambda function deployed on API Gateway.