Hey there,
I've got extensive experience of writing Lambda functions using Nodejs/Python and Java. I've also configured Lambda to use PHP as well, so I'm very much well versed in developing Lambda functions. You can confirm this by checking out my profile page, you will see lots of Lambda related projects.
I've worked with almost all of the Amazonn AWS services as well including DynamoDB, CodeDeploy, ElasticBeanstalk, Elastic Load Balancer, etc.
Please feel free to ask if you've any questions.
Thanks