Building a Serverless Agriculture Platform with AWS

While building HarvestIQ , I started paying much more attention to how backend architecture affects the way a product can be built, deployed, and scaled. HarvestIQ is an agriculture platform designed to help smallholder farmers access post-harvest intelligence, including market prices and buyer opportunities. One of the interesting parts of the project is that a farmer can interact with the system through USSD , without requiring a smartphone or an internet connection. The backend is built around a serverless architecture using AWS services. This article breaks down how that architecture works and what I have learned from building it. What does "serverless" actually mean? The name can be misleading. Serverless does not mean that there are no servers. The servers still exist. AWS manages the underlying infrastructure, while I focus on writing and deploying the application code. Instead of maintaining an always-running backend server, different parts of the application can run when they are needed. For HarvestIQ, this works particularly well because many operations are event-driven. A farmer makes a request. A function executes. Data is retrieved or updated. The function finishes. Another event can trigger another function later. HarvestIQ's Serverless Architecture The simplified architecture looks like this: Farmer | USSD | v Africa's Talking | v AWS Lambda / \ / \ v v DynamoDB Response EventBridge | v AWS Lambda | v Price / Alert Logic | v SNS | v SMS | v Farmer Each AWS service has a specific responsibility. AWS Lambda handles application logic. DynamoDB stores application data. EventBridge triggers scheduled operations. SNS handles notifications. Africa's Talking provides the USSD and SMS connectivity layer. Let's look at each part. 1. USSD as the Entry Point One of the design goals of HarvestIQ is accessibility. A farmer should not necessarily need: A smartphone A mobile application Mobile data A web browser A basic mobile phone with cellular connectivity can be