<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>Sijo Thomas — Blog</title><description>Notes on building production ML systems — RAG on AWS, time series forecasting, and engineering practice.</description><link>https://sijothomas97.github.io/portfolio/</link><item><title>Rebuilding My Portfolio with Astro</title><link>https://sijothomas97.github.io/portfolio/blog/from-jekyll-to-astro/</link><guid isPermaLink="true">https://sijothomas97.github.io/portfolio/blog/from-jekyll-to-astro/</guid><description>Why I rebuilt my single-README Jekyll portfolio with Astro 5 + Tailwind v4, and what I&apos;d do differently next time.</description><pubDate>Sat, 01 Mar 2025 00:00:00 GMT</pubDate><category>Astro</category><category>Tailwind</category><category>Portfolio</category><category>Web Development</category></item><item><title>Building RAG Systems on AWS: A Practical Guide</title><link>https://sijothomas97.github.io/portfolio/blog/building-rag-systems-aws/</link><guid isPermaLink="true">https://sijothomas97.github.io/portfolio/blog/building-rag-systems-aws/</guid><description>Lessons from production RAG pipelines on AWS — chunking, hybrid search, evaluation, and tools that hold up beyond the demo.</description><pubDate>Wed, 15 Jan 2025 00:00:00 GMT</pubDate><category>RAG</category><category>AWS</category><category>LLM</category><category>GenAI</category><category>Python</category><category>LangChain</category></item><item><title>Lessons from Financial Time Series Forecasting</title><link>https://sijothomas97.github.io/portfolio/blog/time-series-forecasting-lessons/</link><guid isPermaLink="true">https://sijothomas97.github.io/portfolio/blog/time-series-forecasting-lessons/</guid><description>What real financial data taught me about stationarity, ARIMA vs GARCH, walk-forward validation, and the metrics that actually matter.</description><pubDate>Sun, 01 Dec 2024 00:00:00 GMT</pubDate><category>Time Series</category><category>Python</category><category>Statistics</category><category>Finance</category><category>ARIMA</category><category>GARCH</category></item></channel></rss>