Architecture, design, and development of complex distributed web and mobile products using technologies such as: Application servers, web servers (e.g., NGINX) API gateways (e.g., Kong) CDNs and caching solutions (e.g., Redis, EHCache) Service meshes (e.g., Consul, Istio, Kuma) Containers (e.g., Docker, Podman) Messaging systems (e.g., Kafka, RabbitMQ) Container orchestration platforms (e.g., Kubernetes, K3S) Design and implementation of complex database models using both relational and non-relational systems such as MySQL, MariaDB, SQLite, MongoDB, Couchbase, AWS Aurora, and DynamoDB. Architecture of cloud-native applications, preferably using AWS services including EC2, ECS, EKS, Lambda, S3, RDS, Aurora, DynamoDB, SNS, SQS, SES, ALB, API Gateway, Quicksight, and CloudWatch.