Real-world lessons from engineering a low-latency messaging engine that handles thousands of concurrent users — using ActionCable, Redis pub/sub, and careful connection management.
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How we architected the core matching logic for a social carpool platform — covering transactional integrity, spatial queries, and real-time confirmations with ActionCable.
How I built a Go + LLM pipeline that reads raw Vietnamese Facebook posts about badminton and pickleball meetups, extracts structured data, geocodes addresses in Ho Chi Minh City, and feeds it into a Rails app — end to end in under 2 seconds per listing.
A practical walkthrough of wiring a Dify RAG workflow into a Ruby on Rails backend — covering API design, prompt context injection, and streaming responses to the frontend.