Event-Driven Application Architecture
Modernize Your Applications with Event-Driven Architectures on AWS
Build secure, serverless applications designed to respond and scale in real time with the help of Qalius, an AWS Advanced Consulting Partner and Service Delivery Partner for AWS Lambda.
“Qalius came highly recommended to us by AWS. Involving them early in the concept development stage of Picturethis3D was one of our best decisions. Their service is always friendly and highly professional.”
Eevi Jensen, Founder and CEO, Picturethis3D
Stay Responsive, Scalable, and Cost-Efficient with Event-Driven Architecture
Event-driven applications are assembled from lightly coupled services that are triggered by events such as transactions, data arrival, or other systems. Event-driven applications can run code on AWS Lambda, where you only pay for the time it takes to run the code, making it easier to scale without overspending.
At Qalius, we specialize in web applications that use on-demand computing services from AWS. We combine general-purpose compute services, such as AWS Lambda, with specialized services, such as AWS artificial intelligence services, to implement a custom solution that suits your unique requirements.
No matter how unusual your business rules are, our AWS and web application specialists will develop the right event-stream processing solution.
Only Pay For What You Use
When you use an event-driven architecture, business activity triggers resource provisioning. Since you don’t pay for idle resources, the solution has low AWS service costs that scale with the event volume.
Worry-free Scaling
Event-driven architectures are well suited for applications built from lightly coupled services that scale horizontally. Qalius uses AWS services such as API Gateway that scale automatically across multiple Amazon Availability Zones, and AWS Lambda that permits concurrent executions to cope with practically any change in your business.
Fault Tolerance
Event-driven application architectures have components that are loosely coupled through an event bus. These architectures are fault-tolerant when they are designed to queue events until processing capacity becomes available. The result is an application that copes with the temporary loss of a third-party service or the failure and retry of an individual transaction.
Organizations That Trust Qalius to Build Their Event-Driven Applications
Event-Driven Application Development Tailored to Your Industry
Qalius designs and builds serverless, event-driven applications that meet the real-time demands and compliance requirements of highly regulated industries.
Canadian Healthcare
We build new capabilities for clinicians or researchers using event-driven architectures on AWS services such as AWS Lambda and Amazon API Gateway. The security model of these cloud-native services helps maintain compliance with Canadian privacy standards like PHIPA, and CCCS-Cloud Medium.
Canadian Public Sector
Qalius develops cloud-native applications for public-sector organizations that require secure, event-driven architectures, whether for inter-agency data exchange, digital service delivery, or real-time analytics.
FinTech
We build event-driven applications for FinTech organizations that need to scale their transaction processing in real time. From scalable payment workflows to integrations with financial services partners and instant customer notifications, our serverless architectures ensure maximum performance, security, and compliance.
Event-Driven Architecture Use Cases
Run Daily Tasks
Execute functions such as data aggregation, report generation, or archiving, triggered on a schedule or by data arrival.
Extend a Legacy Application
Add features to an existing application without updating the legacy source code, by adding serverless components that are triggered by the actions of the existing application.
Process Discrete Transactions
Process transactions as they occur to validate the transaction, update third-party systems, implement your custom business rules, or apply real-time analytics.
Access Advanced AWS Services
Trigger the execution of AWS services to add advanced capabilities to a new or legacy application, delivering generative AI, business intelligence, and other capabilities.
Case Study
Qalius Designs Twenty-First Financial’s Financial Services Portal on AWS
Learn how Qalius implements Twenty-First Financial’s portal on Amazon Web Services with on-demand computing in AWS Lambda for a secure, scalable, and cost-effective solution.
Our Event-Driven Design Process
We will work closely with your team to understand your existing processes and your current needs to ensure we offer the best possible outcome for your business.
Identify Triggers and Processing Requirements
We work with you to identify the triggering events and the corresponding data transformation requirements.
Architect a Lightly Coupled Application
We define the data transformation services and architect the push and pull mechanisms that queue work and trigger processing.
Implementation
We implement the solution on AWS-native services to deliver an exceptional security model, scalability, and cost effectiveness.
Why Choose Qalius for Your Event-Driven Application Architectures?
AWS and Application Development Experts
Qalius combines deep AWS expertise with agile application development to modernize your existing systems or build cloud-native applications from the ground up. Whether you're optimizing legacy applications or launching new ones, we design scalable solutions that grow with your business.
Serverless Applications Specialists
At Qalius, we build serverless applications to deliver maximum scalability, performance, and cost-efficiency for your event-driven systems. By combining services like AWS Lambda, DynamoDB, and API Gateway, we create streamlined solutions that eliminate infrastructure headaches and adapt effortlessly as your business evolves.
A Custom Approach
Qalius’ application templates accelerate time-to-market, but the specific business rules are customized for your unique business requirements.
Direct Access to Experts
When you work with Qalius, you work directly with the experts building your event-driven applications; there are no middlemen or handoffs to offshore teams. Qalius leadership is always just one call away to ensure quick resolutions and smooth collaboration.
Qalius is an AWS Service Delivery Partner for Lambda
Qalius is recognized as a Service Delivery Partner for AWS Lambda, an achievement that validates our deep expertise in building and migrating event-driven applications using AWS serverless technologies. This designation means our solutions meet the rigorous technical standards of the AWS Well-Architected Framework and have been proven in real-world customer deployments.
We are an AWS Advanced Consulting Partner
Contact Us
Speak with an Event-Driven Architecture Consultant
Ready to eliminate AWS operational headaches and focus on your business growth? Schedule a consultation with our AWS specialists to discuss your application support requirements.
Frequently Asked Questions
What is event-driven architecture?
Event-driven application architectures are built from components that each perform a specialized process. An event triggers each component. The event is usually the arrival of an input that needs to be processed. The input could be a transaction submitted to your business, the arrival of a file to process, or intermediate outputs from earlier stages of the application process.
What is an example of event-driven architecture?
Event-driven architectures are applicable in countless use cases where an event occurs and that event immediately triggers other events. An example is when an application recognizes that a picture has been submitted (a triggering event), uses the Amazon Rekognition service from AWS to see if it contains any cats (event processing), and then updates a cat counter (the output) with the number of cats spotted in pictures this week.
What are the principles of event-driven architectures?
Event-driven architectures should implement their event processing in discrete process steps. The steps should be decoupled by queuing work in between process steps. The queues ensure that transactions don’t get lost if a process step is temporarily unavailable. Event-driven architectures should be built on on-demand services such as AWS Lambda so you only pay for cloud services when there is a triggering event that requires processing.
What is AWS Lambda?
AWS Lambda is a serverless, event-driven compute service that lets you run code for virtually any type of application or backend service without provisioning or managing servers.
Which language is best for AWS Lambda?
AWS Lambda has native support for several runtimes enabling your code to be written in Node.js, Python, Go, Ruby, .NET, and Java. Qalius recommends considering the breadth and depth of expertise in your organization to be sure you can support the solution long-term. Runtimes such as Node.js and Python initialize quickly so they are a good choice for use cases where executions are intermittent and low latency is important. Java may take longer to initialize, but the code may execute quickly, which can reduce cost in use cases that have long-running processes.
What is a key benefit of AWS Lambda?
The AWS Lambda service was launched in 2014 and has benefited from many years of refinement with large and small global workloads. At Qalius, we especially appreciate that AWS Lambda integrates easily with many AWS services to reduce time-to-market for custom web applications. Recent enhancements improve AWS Lambda for enterprise use cases by streamlining connections to resources in private networks within Amazon VPC.