Ruby on Rails Development
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Ruby MRI
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Web services
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Custom generators
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TDD
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Social networks
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Query optimization (active records) + cache
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Deploy to Nginx/Apache by passenger and heroku
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Newrelic monitoring
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Tasks/background process
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PDF and OCR manipulation
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Cloud files (Amazon, Google)
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Custom engines or gems
Databases
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Mysql (Fulltext search, Caching, Index optimization)
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Sqlite
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Postgress
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Html5 database
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Mongo DB