• Designed backend architecture. Owned delivery.
• Shipped REST APIs. Clean contracts.
• Built microservices. Clear boundaries.
• Added gRPC where latency matters.
• Implemented authentication and access control. Enforced least privilege.
• Built-in async processing. Queues. Workers. Schedulers.
• Designed data models. Migrations. Indexes.
• Tuned queries. Reduced slow endpoints.
• Added caching. Reduced database load.
• Built observability. Logs. Metrics. Traces.
• Containerized services with Docker and Kubernetes.
• Wrote tests. Protected critical flows.

Tech keywords: Python (Django/FastAPI), PHP(Symphony, Yii, Yii2, Laravel), Node.js (NestJS/Express), Go, Java (Spring), C#/.NET, C/C++, GT, PostgreSQL/MySQL, MongoDB, Redis, RabbitMQ/Kafka, Docker, Kubernetes, Prometheus/Grafana, OpenTelemetry, Nginx, AWS/GCP/Azure.

• Delivered backend services for client products. Production-first.
• Built APIs that teams could trust. Clear contracts. Clean validation.
• Developed PHP backends (Laravel/Symfony-style). Shipped fast. Stable.
• Developed C#/.NET backends (ASP.NET Core). Enterprise-grade.
• Designed domain models. Strong business rules. No "fat controllers".
• Built reliable DB layers. MySQL/PostgreSQL + SQL Server patterns.
• Optimized SQL. Fixed slow queries. Added indexes. Tuned joins.
• Implemented async processing. Jobs, retries, idempotency, scheduling.
• Integrated third-party services. Payments, email/SMS, identity providers.
• Built caching with Redis. Reduced database pressure.
• Implemented auth flows. JWT/OAuth2, roles/permissions, secure sessions.
• Hardened security. Input sanitization. Rate limiting. OWASP mindset.
• Refactored legacy modules. Reduced tech debt. Increased maintainability.

• Built core backend features.
• Implemented CRUD, business rules, permissions.
• Worked with SQL databases. Migrations. Backup basics.
• Implemented authentication and session handling.
• Fixed bugs fast. Improved reliability.
• Helped with deployments and monitoring basics.