AWS
AWS Certified Developer - Associate (DVA-C02) #6 Domain 1-5 Development with AWS Services — SDK Development Patterns
The fifth post of the DVA-C02 development domain. It covers the common patterns that recur when calling services with the AWS SDK: pagination, exponential backoff and jitter for handling throttling and transient errors, idempotency implementation, S3 multipart upload and presigned URLs, and the SDK credential provider chain along with region and retry configuration, all at the exam level.
AWS book now available free in full — AWS: From Basics to Production Operations
From your first IAM policy to running a fullstack app on ECS Fargate, this 33-chapter, six-part AWS practical book is free to read in full on the site.
AWS Certified Developer - Associate (DVA-C02) #5 Domain 1-4 Development with AWS Services — Messaging and Events
The fourth post of the DVA-C02 development domain. It covers the difference between SQS standard queues and FIFO queues, visibility timeout and long polling, DLQs, SNS pub/sub and fan-out (SNS + SQS), EventBridge's event bus and rule-based routing and schedules, and Step Functions' state machines (Standard vs Express), all at the exam level. Knowing when to choose which messaging service is the core.
AWS Certified Solutions Architect - Associate (SAA-C03) #16 Full-Scale Multiple-Choice Practice Exam — 50 Questions + Explanations
The final post of the SAA-C03 series. Matched to the real exam's domain weights (security 30% , resilience 26% , high performance 24% , cost 20%), you solve 50 questions and find your weak domains through each question's answer and explanation. Solve them on the clock, then go back to the relevant domain post to shore up any gaps.
AWS Certified Developer - Associate (DVA-C02) #4 Domain 1-3 Development with AWS Services — DynamoDB Development
The third post of the DVA-C02 development domain. It covers DynamoDB key design (partition key, sort key), the difference between LSI and GSI, read consistency (eventually consistent vs strongly consistent), capacity modes (on-demand vs provisioned) and throttling, optimistic locking implemented with conditional writes, atomic counters, DynamoDB Streams, TTL, and DAX caching, all at the exam level.
AWS Certified Solutions Architect - Associate (SAA-C03) #15 Exam Tips and Frequently Missed Patterns
After finishing SAA-C03 domain study, here is the practical strategy for protecting your score in the exam room. It lays out time management across 130 minutes and Mark for Review, how to filter options by constraint keywords, the elimination strategy, and the concept pairs most often confused on the exam (Multi-AZ vs. read replica, SG vs. NACL, Gateway vs. Interface Endpoint, and more) in a single table.
AWS Certified Developer - Associate (DVA-C02) #3 Domain 1-2 Development with AWS Services — API Gateway
The second post of the DVA-C02 development domain. It covers the difference between API Gateway's REST API and HTTP API, Lambda proxy integration, the three authentication methods (IAM, Cognito authorizer, Lambda authorizer), throttling and usage plans/API keys, caching, stages and stage variables, and CORS, all at the exam level. API Gateway is the gateway to serverless APIs and appears in the development domain second only to Lambda.
AWS Certified Solutions Architect - Associate (SAA-C03) #14 Domain 4-2 Cost Optimization — Cost Monitoring
The final post of the SAA-C03 cost optimization domain. It covers Cost Explorer for analyzing and forecasting cost, AWS Budgets for alerting on budget overruns, CUR as the most detailed billing data, Trusted Advisor for checking cost , security , performance, Compute Optimizer for right-sizing recommendations, and how to manage multi-account cost with consolidated billing and cost allocation tags.
AWS Certified Developer - Associate (DVA-C02) #2 Domain 1-1 Development with AWS Services — Lambda Deep Dive
The first post of the DVA-C02 development domain. It covers Lambda's execution model across three invocation types — synchronous, asynchronous, and stream polling — along with concurrency (reserved concurrency, provisioned concurrency) and throttling, environment variables and layers, cold starts, idempotency, and failure handling via destinations and DLQs, all at the exam level. The development domain carries the largest weight at 32%, and Lambda sits at its center.
AWS Certified Solutions Architect - Associate (SAA-C03) #13 Domain 4-1 Cost Optimization — Pricing Models
The first post of the SAA-C03 cost optimization domain. It reorganizes EC2 purchasing options from a cost perspective (Reserved Standard/Convertible, Compute/EC2 Instance Savings Plans, Spot), the cost structure of S3, data transfer costs (inbound , outbound , cross-AZ/region) and how to reduce them, and architecture choices that lower cost.
AWS Certified Developer - Associate (DVA-C02) #1 Exam Introduction — Exam Structure and Study Roadmap
The first post of the AWS Certified Developer - Associate (DVA-C02) series. It covers the exam structure (65 questions, 130 minutes, a 720 passing line), the weight and meaning of the four domains (Development 32% , Security 26% , Deployment 24% , Troubleshooting and Optimization 18%), how it differs from the Solutions Architect Associate (SAA-C03), and a study strategy that turns the hands-on feel built on the [AWS practical track](/en/posts/aws-basics-1-account-region-az) into exam questions from a developer's point of view. This 15-part series aims to help you pass DVA-C02, ending with a full-scale mock exam in #15.
AWS Certified Solutions Architect - Associate (SAA-C03) #12 Domain 3-4 High-Performing Architectures — Choosing a DB
The final post of the SAA-C03 high-performing domain. It covers the decisive difference between RDS's Multi-AZ (high availability) and read replicas (read scaling), cloud-native Aurora (auto storage scaling , Global , Serverless), NoSQL DynamoDB (capacity modes , global tables , DAX), Redshift for analytics, and the criteria for choosing a database by workload.