- Backend: Python, Django, Django REST Framework (DRF), FastAPI, Flask, Expressjs, Nestjs, Nodejs, RESTful APIs, authentication/authorization, rate limiting, API versioning, OOP patterns
- Frontend: TypeScript, JavaScript, React, Nextjs
- Data: PostgreSQL/MySQL (schema design, indexing, query tuning), SQL, Redis, database design
- Cloud/Infra: AWS (ECS, EKS, Lambda, EC2, RDS, S3), Azure, Terraform, CloudFormation, Docker, Linux, Bash, modern web app deployment (CI/CD, containers, IaC)
- Observability/Quality: Prometheus, Grafana, alerting/SLOs, logging, pytest, unittest, TDD, CI/CD (GitHub Actions, Jenkins), Postman, Selenium, Cucumber, Git
- Collaboration: Architecture/design reviews, on-call/incident response, runbooks, mentoring, Agile/Scrum ceremonies