Cloud Application Developer Checklist for Web Applications

Deploying a web application to the cloud is not simply a matter of copying files to a server. A cloud-native deployment requires deliberate decisions about infrastructure architecture, configuration management, security posture, and operational observability. A development team that skips these considerations discovers their shortcomings during the worst possible time: a production incident.

Use this checklist to ensure your cloud deployment is production-ready from day one.

1. Infrastructure as Code (IaC)

Manual, click-through cloud console configurations are a disaster waiting to happen. If your server is ever terminated or corrupted, you must be able to rebuild the entire infrastructure from scratch in under 30 minutes.

• Use IaC from the Start: Define all infrastructure (servers, databases, load balancers, DNS records, S3 buckets) in code using tools like Terraform, AWS CDK, or Pulumi. Commit this code to version control alongside your application code.
• Separate Environments: Your staging environment must be a near-identical mirror of production. Use the same IaC templates with different variable values (instance size, replica count) for each environment. "It works on staging" means nothing if staging uses a different database engine than production.
• Immutable Infrastructure: When deploying a new version, do not SSH into the running server and update files manually. Instead, build a new server image (AMI or Docker image) with the new code and replace the old server. This eliminates "it works on my server" issues caused by configuration drift.

2. Configuration and Secret Management

• No Secrets in Code or Environment Files: Production secrets (database passwords, API keys, Stripe keys) must never be committed to a Git repository—not even in a .env file in a private repository. Use AWS Secrets Manager, HashiCorp Vault, or Doppler to manage secrets.
• Parameter Store for Configuration: Non-secret configuration (feature flags, service URLs, queue names) should be stored in AWS SSM Parameter Store (or equivalent) and retrieved at application startup. This allows configuration changes without redeploying the application.
• Rotate Secrets Regularly: Implement automatic secret rotation using your secret manager's built-in rotation feature. A secret that has never been rotated since the application launched is a critical security liability.

3. Networking and Security Groups

• Principle of Least Access: Your database server must not be publicly accessible from the internet. It should only accept connections from the application server's security group. Your application server should only accept HTTP/HTTPS traffic from the load balancer, and SSH only from a designated bastion host IP.
• WAF (Web Application Firewall): Attach AWS WAF or Cloudflare's WAF to your load balancer or CDN. This provides automatic protection against common web attacks (SQL injection, XSS, rate-based DDoS) without any application code changes.
• VPC Isolation: Run all application infrastructure inside a Virtual Private Cloud (VPC) with clearly defined public subnets (for load balancers and NAT gateways) and private subnets (for application servers and databases).

4. Observability Stack

• Centralized Logging: Ship all application logs (Nginx access logs, PHP-FPM logs, application-level logs) to a centralized log aggregator: AWS CloudWatch Logs, Datadog, or Papertrail. This allows you to search and correlate logs across multiple servers simultaneously.
• Infrastructure Metrics: Monitor CPU, RAM, disk I/O, and network throughput on every server. Set CloudWatch alarms at 80% thresholds to alert before resources are exhausted.
• Distributed Tracing: For multi-service architectures, implement distributed tracing (AWS X-Ray or OpenTelemetry) to understand the latency breakdown of a request across services, queues, and databases.

Building a production-grade cloud infrastructure requires a developer who understands both application architecture and cloud operations. If you need a technical partner to design and deploy your cloud application stack, visit my cloud infrastructure development page to discuss your project.