Gunnar Grosch
banner
gunnargrosch.com
Gunnar Grosch
@gunnargrosch.com
Principal Developer Advocate AWS | Engaged to the wonderful @arcticf0xx.com | Opinions are my own | gunnargrosch.com
These aren't vendor pitches - they're practitioners sharing real code, real demos, and real learnings from building production systems. AWS Heroes solving actual problems with hard-won experience.

📝 Full summary with all 27 Breakout Sessions & Code Talks: builder.aws.com/content/37r7...
January 5, 2026 at 10:27 PM
60 unique sessions, 93 speakers covering: GenAI & Agentic AI (Strands Agents SDK, Amazon Bedrock), Developer Tools (Kiro, Q Developer), Security, Infrastructure (serverless, edge), Modernization, and Data (DSQL).

Real implementations, production patterns, lessons learned from practitioners.
January 5, 2026 at 10:27 PM
Full code samples, RISEN prompts, and SAM template available on GitHub.

📖 Deep-dive: builder.aws.com/content/37lC...

🎥 Session: www.youtube.com/watch?v=9O9z...
AWS re:Invent 2025 - Building Scalable, Self-Orchestrating AI Workflows with A2A and MCP (DEV415)
YouTube video by AWS Events
www.youtube.com
January 4, 2026 at 8:31 PM
Best demo moment: Allen's "destroyed package" scenario where contents caught fire, got run over by multiple cars, then the ashes caught fire again. 🔥🚗

The agents handled it autonomously - no predefined rules needed. That's the power of multi-agent choreography.
January 4, 2026 at 8:31 PM
Key takeaways: Break architecture into steps, use steering files for control, security by default, observability is integral, seamless console-to-IDE transitions.

Shridhar's advice: "Don't be shy with your prompts. The more specific, the better!"
January 3, 2026 at 6:24 PM
We used Kiro CLI with AWS Serverless MCP server. The MCP server transformed Kiro from just suggesting CLI commands to actually executing them with tools like sam_init, sam_build, sam_deploy.

Built: API Gateway + Lambda + Bedrock + S3 + React frontend + CloudWatch observability
January 3, 2026 at 6:24 PM
Amazon S3 Vectors: First cloud object storage with native vector support, billion-vector scale, subsecond latency. Travel assistant demo remembered user preferences across sessions using metadata filtering.

Elizabeth's tip: "Describe tool capabilities, not service names!"
January 2, 2026 at 6:17 PM
Strands Agents SDK: 3M+ downloads, minimal code for production agents. Demo showed analyzing architecture diagrams, docs & 6-min glacier video with scene-by-scene summaries. MCP integration for remote tools, conversation management with sliding window/summarization strategies.
January 2, 2026 at 6:17 PM
Key tech: rmcp crate with #[tool_router], #[tool_handler], #[tool] macros. Standalone binaries, zero dependencies, cross-platform.

Production examples: IAM Policy Autopilot (AWS open source), Grimoire MCP (code pattern storage)
January 1, 2026 at 5:33 PM
Live demo highlights:
• To-Do MCP Server with type-safe parameters
• Thermal receipt printer integration using recibo crate
• Hardware control - LLM analyzes code, creates tasks, physically prints them on receipts!

Rust MCP servers: <1 second startup vs 4+ seconds for TypeScript
January 1, 2026 at 5:33 PM
Key topics: Amazon Bedrock AgentCore (serverless runtime, 8-hour workloads), Memory (semantic search, user preferences), Gateway (semantic tool search saves tokens/costs), Kiro (spec mode + vibe mode), full CloudWatch observability

Du'An: "Start with observability from the beginning!"
December 31, 2025 at 1:47 PM
Multi-agent food tracker demo: user-facing agent, orchestrator, 2 MCP servers (recipe + nutrition via Gateway). Built with FastMCP in Python. Converted existing Lambda functions to MCP servers without code changes. Memory demo showed user preferences persisting across sessions!
December 31, 2025 at 1:47 PM