Adrian Mejia

For understanding the virtual thread state transitions... Specifically, thread pinning on Java 21 vs. Java 24 and when the thread waits on IO how the platform thread views the state compared against the virtual thread enabling interruption

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Alert backtesting is a game changer! Excited that Airbnb Reliability Engineering is sharing our new OaC (observability as code) developer workflow for crafting and validating alerts before they go live. https://lnkd.in/gkknChcT

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rqlite -- and the way I develop it -- is fundamentally changing. LLMs are in the loop -- from ideation to Pull Request. https://lnkd.in/ejwXGddR

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Over the past year, my team and I built Pinterest's Model Context Protocol (MCP) ecosystem from the ground up: a central registry, a growing fleet of domain-specific MCP servers, and production integrations across our IDEs, internal chat surfaces, and AI agents. MCP is an open standard that gives large language models a unified way to talk to tools and data sources. At Pinterest, we used it as the substrate for AI agents that can safely automate real engineering tasks, from querying Presto data on demand to diagnosing Spark job failures and surfacing institutional knowledge. A few things I'm particularly proud of: * We designed for security from day one: two-layer auth (end-user JWTs + mesh identities), business-group-based access gating, and mandatory human-in-the-loop for sensitive actions. * We made it easy for any team to ship a new MCP server by creating a unified deployment pipeline that handles all the infrastructure, so domain experts just write business logic. * The ecosystem has scaled to 66,000+ invocations per month across 844 monthly active users, saving an estimated 7,000 engineering hours per month. This was a cross-functional effort. Thank you to everyone on the Agent Foundations, Security Engineering, and Traffic Engineering teams who made this possible, and to our engineering sponsors for their support and guidance. Full write-up on the Pinterest Engineering Blog: https://lnkd.in/e-mH26Bw

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A lot shifted in 2025. AI made some things easier and other things more complicated, and it pushed teams to focus more on resilience. The 2025 State of the Internet Year in Review breaks down what stood out most this year. https://lnkd.in/eh2eZXfA

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Emerging trend: self-correcting software systems. Specs go in, tests come out. This keeps Implementation on the rails and provides resilience to future changes. Specs, tests, and docs are the new focal points for engineering teams focused on safety and reliability.

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We're in the Palm Pilot era of AI. It is flashy and has its uses. But the iPhone era of digital superintelligence is right around the corner, and today's LLMs will quickly become relics.

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With AI, according to all of the marketing materials from all of the companies, including Meta, SWE not required anymore and you can just scale your engineering up by using LLM models alone... Yet: - Meta cannot keep Desktop app for their own Facebook Messenger alive - https://lnkd.in/ekKTbEfG keeps growing and Google cannot continue to develop already released products - Windsurf cannot keep up and to have their IJ plugin for Remote Development in sync with their non-RD plugin https://lnkd.in/eeMjrZ_6 - Claude IJ plugin is also far from perfect What has happened to "You need to practice what you preach"?

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