How Amazon Scales Up for Prime Day with AWS  

In 2015, Amazon launched its first Prime Day, a global shopping extravaganza created to celebrate its 20th anniversary. At the time, no one could have predicted how this event would grow.

Fast forward to 2026, and Amazon runs two Prime-level events every year: Prime Day in the summer and Prime Big Deal Days in October. Adobe data shows that US online spending during the June 2026 Prime Day dates grew by roughly 9.3% year over year to $26.4 billion. That made it the largest summer e-commerce event on record.

But what exactly happens on Amazon Prime Day? Let’s find out.

When Is Amazon Prime Day 2026 and Prime Big Deal Days

Amazon brought Prime Day forward to June this year, partly to avoid clashing with the FIFA World Cup and the US 250th anniversary celebrations, and kept the four-day format. The event ran from 23 to 26 June 2026.

The next peak is Prime Big Deal Days, often called October Prime Day. It runs on 6 and 7 October, giving Prime members two days of member-exclusive deals from 12:01 a.m. The 48-hour event spans more than 35 categories, and Prime members in 22 countries can take part, although dates may vary by country.

What Happens on Amazon Prime Day 

Amazon Prime Day might be enticing for you as a customer. But behind the scenes, Amazon is engaged in an intense and complex dance. The company gears up to meet the enormous and unpredictable spikes in traffic that occur within a short window. Prime Day, with its billions of transactions, demands cutting-edge technology to ensure a seamless shopping experience.  

And who’s the key player in this technological feat? It is none other than Amazon Web Services (AWS), Amazon’s cloud computing platform. Amazon AWS is the powerhouse that makes scaling operations possible, handling billions of requests and keeping everything running smoothly.  

The success of Prime Day owes much to AWS’s ability to dynamically scale, optimise performance, and provide reliability—factors that are essential to managing such an enormous retail event. 

The Importance of Scalability for Prime Day 

Imagine hosting a global event that brings millions of people from different regions to your platform all at once, at different times. Now, each of those users is actively browsing, adding items to their cart, and making purchases within a window of two to four days.  

Enabling this very experience calls for a capability called scalability. For Amazon, the challenges of Prime Day are more unique and complex, though. Here’s how.  

Amazon Prime Day Performance 

The most recent official figures come from Prime Day 2025, the first four-day edition. AWS reported that Lambda handled more than 1.7 trillion invocations per day, and that DynamoDB peaked at 151 million requests per second.

Scaling isn’t just about adding more servers. The unpredictability of customer behaviour means Amazon must be prepared for anything. There’s no time for slow load times or failed transactions; each second of downtime can cost Amazon millions in lost revenue. That’s where AWS’s ability to scale infrastructure instantly becomes critical. 

AWS allows Amazon to adjust its cloud resources dynamically to meet Prime Day’s demands. Whether increasing server capacity through Amazon Elastic Compute Cloud (EC2) or managing the high volumes of data and requests through Amazon DynamoDB, Amazon AWS services provide the backbone for Amazon’s infrastructure. 

Leveraging AWS for Prime Day Success 

AWS is much more than a cloud platform; it’s the secret behind Amazon’s ability to handle Prime Day’s incredible demands.  

Elastic Compute Cloud (EC2) powers Amazon’s computing needs, providing the scalable computing capacity that drives billions of transactions. EC2, particularly with AWS Graviton-based instances, allows Amazon to optimise both performance and cost-efficiency, a crucial balance during high-traffic events like Prime Day. During Prime Day 2025, Graviton powered more than 40% of the EC2 compute Amazon.com used. Amazon also deployed over 87,000 Inferentia and Trainium chips to run its Rufus shopping assistant. 

During Prime Day 2025, DynamoDB, a fully managed NoSQL database, took tens of trillions of API calls from Alexa, the Amazon.com sites and every Amazon fulfilment centre, peaking at 151 million requests per second while keeping responses in single-digit milliseconds. DynamoDB automatically scales to meet the increased demand, ensuring low-latency operations across the globe. The fact that DynamoDB can manage this level of traffic without sacrificing performance is one of the reasons why Amazon can maintain such a smooth customer experience during Prime Day. 

AWS also powers Amazon’s backend systems that ensure everything runs seamlessly.  

Amazon CloudFront, a content delivery network (CDN), distributes content globally, ensuring that users have fast, reliable access to the website, no matter where they are. AWS Lambda, a serverless computing platform, ensures that Amazon’s infrastructure runs code in response to real-time events—essential for responding to customer interactions and transactions during peak traffic. 

Ensuring Security and Compliance 

Handling billions of dollars in sales and processing sensitive customer information presents significant security challenges. AWS’s robust security infrastructure is a major reason Amazon can ensure secure and compliant operations throughout Prime Day.  

AWS CloudTrail provides detailed auditing capabilities, tracking every transaction and event across Amazon’s infrastructure. This ensures that security protocols are maintained at all times and helps meet regulatory compliance. 

During Prime Day 2025, CloudTrail processed more than 2.5 trillion events, up from 976 billion in 2024. Amazon GuardDuty monitored an average of 8.9 trillion log events per hour, a 48.9% rise on the previous year.

Moreover, with AWS Shield, Amazon is protected from potential DDoS attacks, which could cripple the site during a high-profile event like Prime Day. The AWS Identity and Access Management (IAM) controls access to resources, ensuring that only authorised personnel can make changes. Security is embedded at every level, ensuring that while Amazon scales, its data—and its customers’ data—remains safe. 

Enhancing Customer Experience Through AWS 

Every second counts when millions of shoppers search for deals, add items to their carts, and check out. 

AWS plays a significant role in ensuring this experience is fast, reliable, and enjoyable. Amazon CloudFront speeds up content delivery by caching static content closer to users, reducing latency, and ensuring product pages load quickly—even when traffic is at its peak. Whether someone is shopping from Los Angeles, Tokyo, or London, AWS ensures they have the same smooth experience. 

Regarding transactions, Amazon Aurora, a relational database built for the cloud, ensures that millions of orders are processed simultaneously without delays. Aurora automatically scales as traffic increases, so checkout processes remain fast and smooth.  

If you’ve ever received a Prime Day email alerting you to a deal, that’s thanks to Amazon Simple Email Service (SES). In 2023, Amazon handled billions of promotional emails during Prime Day with SES, and the system managed a 56% increase in email traffic from the previous year. 

Learn more about AWS cloud migration services and how to modernise your workloads in AWS cloud.   

AWS in Action: Prime Day Success Stories 

The numbers behind Prime Day are staggering, and they paint a vivid picture of how AWS enables Amazon to scale.  

During the global week of Prime Day 2025, Amazon CloudFront delivered over 3 trillion HTTP requests, 43% more than in 2024.

Amazon Aurora, meanwhile, processed 500 billion transactions during Prime Day 2025, storing 4,071 TB and transferring 999 TB of data. Amazon SQS also set a new record, peaking at 166 million messages per second. In one of Amazon’s largest fulfilment centres, AWS Outposts sent more than 524 million commands to over 7,000 robots, a 160% increase on 2024. This level of throughput would be nearly impossible without AWS’s ability to scale seamlessly. And while these numbers are massive, what’s more impressive is that everything ran smoothly from the customer’s perspective—no delays, no downtime. 

On the infrastructure cost side, AWS’s services were critical and cost-effective. This dynamic infrastructure allowed Amazon to generate billions in revenue with zero downtime. 

Corey Quinn took a playful stab at estimating Amazon’s AWS bill for Prime Day 2023, landing on a cool $102 million. But here’s the kicker: that’s based on retail pricing, and let’s be honest—Amazon isn’t exactly paying a total price for its own cloud services. Think of it like getting VIP access to your own concert.  

Even with this eye-popping tab, Prime Day 2023 generated an estimated $12.7 billion in US online spending. By 2026, that figure had more than doubled to $26.4 billion, so that infrastructure cost is more like pocket change compared to the massive payout. It’s the ultimate “you gotta spend money to make money” story, with AWS powering Amazon’s biggest shopping party of the year! 

Optimising AWS Performance for Prime Day 

Amazon’s ability to maximise the benefits of AWS comes from a combination of best practices and innovative strategies: 

1. Autoscaling: AWS’s autoscaling features enable Amazon to automatically increase or decrease capacity based on real-time demand. This ensures that Amazon can meet the needs of Prime Day without overprovisioning during off-peak times. 
2. Graviton Instances: Amazon has boosted performance while lowering costs by moving workloads to AWS Graviton processors. By Prime Day 2025, Graviton powered more than 40% of Amazon.com’s EC2 compute. 
3. Content Delivery Networks (CDNs): Amazon CloudFront reduces latency by caching content closer to users, ensuring faster page loading—even when millions of users are online at once. 
4. Database Sharding: By splitting data across multiple databases, Amazon ensures that no single database is overwhelmed. AWS services like DynamoDB and Aurora simplify horizontal scaling, preventing bottlenecks during Prime Day’s peak moments. 
5. Real-Time Monitoring and Security: AWS CloudWatch provides real-time monitoring of Amazon’s systems, enabling quick detection and resolution of any issues that may arise during Prime Day. This ensures that any potential problems are fixed before they impact the customer experience. 
6. Chaos Engineering: Amazon ran over 6,800 AWS Fault Injection Service experiments ahead of Prime Day 2025, more than eight times the 2024 count. Running fault tests inside CI/CD pipelines made that increase possible.

Prime Big Deal Days 2026: A Different Kind of Peak

June’s Prime Day tested sustained load, with 96 hours of peak-level traffic instead of a single 48-hour surge. Prime Big Deal Days tests something else. Amazon releases new deals three times a day, at midnight PT, 8 a.m. and 1 p.m. As a result, traffic climbs sharply at each drop and then falls back, so capacity has to scale out and in several times within each day.

AI now accounts for a growing share of that load. Amazon is promoting new ways to find savings through Alexa for Shopping, alongside Rufus. During Prime Day 2025, SageMaker AI processed more than 626 billion inference requests. Every assistant query is another inference call, and each one has to return without slowing checkout.

For any business planning its own peak, the lessons are the same:

• Load-test against scheduled spikes as well as averages.
• Pre-warm capacity before known events.
• Rehearse failure before it happens.

AWS packages this preparation as AWS Countdown, formerly AWS Infrastructure Event Management.

The Future of AWS and Amazon Prime Day 

Amazon’s continued success during Prime Day is due in no small part to AWS’s ability to scale, secure, and optimise its infrastructure. As Prime Day grows in scale each year, the reliance on AWS becomes even more crucial. The partnership between Amazon and AWS ensures that as demand increases, Amazon’s ability to meet it with a seamless, secure, and high-performing platform also increases. 

For other businesses looking to achieve similar scalability and reliability, Deployflow offers specialised AWS solutions and DevOps services that can help you optimise cloud performance, improve security, and reduce costs. Reach out to Deployflow about load-testing and scaling your AWS environment before your next traffic peak.