I still mainly use Django and Ruby On Rails; the main advantage of these two backend technologies is that there are enough solutions available for me to use. I mainly focus on solving business problems, so a ready-made framework (with everything I need) can reduce my decision-making costs and the threshold for using it. For databases, I mainly use MySQL, mainly because I have used it a lot in the past and am familiar with it.

For infrastructure, I insist on using VPS/Cloud Compute to set up my own Docker Swarm cluster for fast iteration and to reduce the complexity of the architecture. I would even prioritize monolithic applications and give up the microservices approach.