Which technologies do you work with? — Engineering notes

Here’s a practical map of what I reach for most often — not an exhaustive résumé keyword list.

Area	Tools
Backend	Ruby on Rails, PostgreSQL, MySQL, Redis, Solid Queue, Solid Cache (also Sidekiq)
Streaming & data	Apache Kafka, Debezium (CDC), ClickHouse, Apache Solr
Frontend	HTML5, CSS, JavaScript, TypeScript, React, Next.js, StimulusJS; Redux / Redux-Saga
Testing	RSpec (unit and integration tests)
Infrastructure	Docker, Kubernetes, Nginx, Puma, GCP, GitHub Actions (CI/CD), Capistrano; Ansible / DigitalOcean / Proxmox in my homelab
Monitoring	New Relic, Monit, logrotate
AI / tooling	Claude Code, Cursor
Leadership	Team leading, mentoring, project management

I pick tools to match the problem: Rails for fast, maintainable backends; React when the UI needs rich client state; streaming pipelines when usage or billing events need to move reliably between systems.

This site and my interactive CV are examples of the React + TypeScript side; most of my day jobs have been Rails-first with a React or legacy JS frontend.