Building a Serverless Car Rental Platform on AWS

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Background

This client operates multiple car rental brands across Ireland. Their current digital platform has had significant success from a competitive perspective, enabling customers to find and secure car rental bookings through the four brands’ websites. This platform has been developed and maintained with a high-security focus while ensuring stability, availability and impressive search engine optimisation (SEO) performance.

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The Challenge

Despite strong performance, maintaining separate codebases for each brand led to growing inefficiencies and placed significant strain on the client’s small but highly skilled IT team. 

This fragmented approach increased complexity, added to maintenance overhead, and slowed innovation, as every update had to be developed and deployed independently across four systems.

The Solution

The client has partnered with fourTheorem to develop a new platform strategy that will consolidate all four brands into a single codebase, leveraging AWS cloud services and serverless architecture for cost-efficiency, scalability, and faster innovation.

With a loosely coupled architecture, the platform supports easy maintenance and future growth. Payment tokenisation simplifies compliance, while deployment across AWS Availability Zones ensures resilience.

A responsive front-end integrates with the client’s Global SSO, loyalty programs, and third-party identity providers for seamless user access.

The Outcome

Serverless Platform Architecture

Deliver a shared, scalable platform for all four brands, with flexibility to expand or adapt as needs evolve.

Improved Security & Compliance

Enforce least-privilege access and implement payment tokenisation to minimise PCI compliance scope

Future-Ready

Prepare the platform to support future innovations, including AI-powered enhancements, self-service features, and internationalisation.

Operational Excellence

Migrate to AWS with a modern cloud architecture, automated deployments, robust observability, and an accelerated AWS Landing Zone setup.

Reduced Costs

Reduce the overall codebase by approximately 80%, lowering TCO and eliminating responsibility for undifferentiated infrastructure.