Hello Reader,

At AWS Re:Invent 2025, AWS announced Lambda Durable Functions that can execute for up to one year while maintaining reliable progress despite interruptions. However, there are caveats:

• The durable execution timeout is one year BUT each function timeout still remains 15 mins max. What does this mean?
• Think of this like a Step Function equivalent, where same Lambda can run many times to execute different parts of the code. It can even checkpoint stuff. When you invoke a durable function with existing execution ID, it will run the same function, possibly from a checkpoint. You can use the same execution ID upto 1 year.
• Durable Function is designed for customers who want to control everything using programming language e.g. Python, JS etc., and not learn a new framework i.e. Amazon State Language for Step Functions.
• Here is another caveat - if you invoke your durable function from an event source such as SQS, Kinesis, or DynamoDB Streams, even the maximum execution timeout becomes max 15 mins from max one year

And yes, if you have been looking for Durable Functions in us-east-1 or us-west-2 and couldn’t find it, you are not crazy. It’s only available in us-east-2 (Ohio)!

Verdict: Durable Functions won't impact microservices or traditional EDA workloads, but for customers who want to use Lambda for workflow orchestrations with multi steps, this becomes a viable option.

There is another big change happened in Serverless world - API Gateway Private Integration change.

API Gateway REST API private Integration does NOT need NLB anymore.

• Previously, REST API private integration needed to terminate at a NLB inside VPC (private link). But if your app is exposed via private ALB, then you needed this NLB to talk to the ALB
• This added extra cost, latency and complexity!
• With the new change, Private REST API Private Integration can end in VPC directly at the ALB! This eliminates the extra NLB inbetween

HTTP API can reach to either ALB and NLB today. But REST API has more features, and more widely used.

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