Sasitha — PortfolioSenior software developer and technical lead. AWS platforms, infrastructure-as-code, full-stack services and generative AI.https://sasitha.dev/Evaluating RAG with context precision, recall and an LLM judgehttps://sasitha.dev/blog/evaluating-rag-with-an-llm-judge/https://sasitha.dev/blog/evaluating-rag-with-an-llm-judge/If you cannot measure retrieval, every prompt tweak is a guess. Here is the evaluation loop our team built, and what it taught us.Tue, 13 Oct 2026 00:00:00 GMTGenAILanding a multi-account AWS organisation, guardrails firsthttps://sasitha.dev/blog/landing-a-multi-account-aws-organisation/https://sasitha.dev/blog/landing-a-multi-account-aws-organisation/Control Tower, SCPs and a security baseline that teams can live with.Tue, 06 Oct 2026 00:00:00 GMTAWSRunning a DCIM platform on AWShttps://sasitha.dev/blog/running-a-dcim-platform-on-aws/https://sasitha.dev/blog/running-a-dcim-platform-on-aws/Lessons from moving data centre management software into the cloud across several sites.Tue, 29 Sep 2026 00:00:00 GMTArchitectureExposing a NestJS agent platform over MCPhttps://sasitha.dev/blog/exposing-a-nestjs-agent-platform-over-mcp/https://sasitha.dev/blog/exposing-a-nestjs-agent-platform-over-mcp/One server, four agents, and the interface choices that kept it simple.Tue, 22 Sep 2026 00:00:00 GMTGenAIConfig-driven agents: multi-agent simulation with YAML and Bedrockhttps://sasitha.dev/blog/config-driven-agents-with-yaml-and-bedrock/https://sasitha.dev/blog/config-driven-agents-with-yaml-and-bedrock/Defining agents as data so scenarios change without code changes.Tue, 15 Sep 2026 00:00:00 GMTGenAIWhy this site runs on Astro, S3 and CloudFronthttps://sasitha.dev/blog/why-this-site-runs-on-astro-s3-and-cloudfront/https://sasitha.dev/blog/why-this-site-runs-on-astro-s3-and-cloudfront/Markdown content collections, static output and a hosting bill measured in cents.Tue, 08 Sep 2026 00:00:00 GMTEngineering