Build Serverless Applications on AWS and Azure

A serverless application runs code in response to events, such as a web request, a file upload or a timer. The cloud provider runs, scales and patches the servers underneath, and on pay-per-use plans you pay for the work done.

No. The servers still exist, but the cloud provider runs and patches them. Your team writes and owns the code, and the provider adds or removes capacity as events arrive.

AWS’s AWS Lambda guide describes it as a serverless compute service that runs code without servers to manage, with AWS handling maintenance, capacity, scaling and patching. Billing is pay-per-use, with no upfront commitment.

Microsoft’s Azure Functions overview lists uses such as processing file uploads, running scheduled tasks, building web APIs and processing message queues. It recommends the Flex Consumption plan, with pay-as-you-go billing, for new apps.

For applications that sit idle much of the day or have uneven traffic, it can be. For applications busy around the clock, containers or reserved servers can cost less. The review compares both for each application.

File processing, scheduled jobs, web APIs, integrations between systems and other work that reacts to events suit serverless well. Long-running processes and applications with steady heavy load can suit other designs better, and we compare both for each one.

AWS’s Lambda guide gives event functions up to 15 minutes per call, with Lambda Durable Functions for longer multi-step workflows. On Azure Functions, run time depends on the hosting plan, and Microsoft lists unlimited run time for the Premium plan. We split long jobs into steps or move them to another service.

A function that has not run recently can take a little longer to start. For background work this rarely matters. Where response time matters, plans with instances kept warm reduce the delay. Microsoft’s overview describes the Azure Functions Premium plan as keeping instances warm for the fastest response times.

Partly. Each cloud has its own functions and event services. Keeping business logic separate from cloud-specific code reduces the work of moving later, and we design for that where it matters to you.

Rebuild each script as a function started by a timer or an event, with retries when another system is down and an alert when a run fails. Our Connect Applications and Business Systems use case covers wider integration design.

Each function gets only the permissions it needs, keys are kept in a secrets store rather than in code and changes go through a reviewed pipeline. Inputs from users and partners are checked before use.

Each function sends logs, traces and failure alerts to one monitoring tool, so the owner sees errors and slow runs. Our Application Modernization and Observability solution covers this in detail.

Set memory and timeouts from testing, add spending alerts for each service, watch for functions that keep triggering each other and review the bill each month. Costs follow use, so a sudden jump points to a fault or a surge.

Yes. We build the first service with them and leave an approved pattern, so they can build the next ones. Where ongoing support is agreed, we review their designs and costs as they go.

Yes. Functions can read and write existing databases and call business systems, in the cloud or in your offices over a secure network link. Connection limits are planned so a traffic peak does not overload the database.

Modernizing legacy applications covers moving and rebuilding older systems in several ways. Serverless is one way to build, suited to event-driven and uneven workloads. Our Modernize Legacy Applications use case covers the wider choices.

We work with AWS and Microsoft as a Technology Partner, building serverless applications on AWS and Azure.

The Serverless Review looks at your applications, scheduled jobs and integrations, and ranks them by how well they suit serverless. It needs a list of applications and their servers, read-only access to usage figures and time with your development lead. We walk you through the findings on a call. Signisys is based in Noida and works with businesses in Delhi NCR and across India; book through this page or call +91 7669 966 966. A Signisys specialist responds within 1 business day, and there is no obligation to go further.