Maxim is working on API development for mobile apps and security layers. Basically, he uses Spring and Netflix ecosystem, but checks out everything that is worth trying on GitHub.
He is experimenting with reactive approaches, a couple of experiments got to the production level.
He wants to understand not only his apps but also everything around them, thus he is working with all the infrastructure (logs, CI/CD, orchestration). To sum up, DevOps is our everything.