React, Next.js, Vue.js, Angular, TypeScript, JavaScript (ES6+), NodeJS, Java (Spring Boot), Golang, Python, Ruby (Rails), NodeJS, Java Spring Boot, RESTful APIs, Microservices architecture, gRPC, Protobuf, AWS (ECR, EC2, EKS, S3, DynamoDB, IAM, Lambda), GCP (Firebase, GCloud, GKE), MySQL, PostgreSQL, MongoDB, Redis, GitHub Actions, GitLab CI, Terraform, Docker, Kubernetes, Prometheus, Grafana, Jasmine/Karma (Angular), JUnit, Mockito, go testing framework, Postman, Swagger/OpenAPI, Agile / Scrum, Jira, Confluence, Cross-functional teamwork