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Irina Nazarova
Startups
on Rails
2025
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ON THE NEWS
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March 16, 2025
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March 16, 2025
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RubyLLM on HN front page
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March 16, 2025
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RubyLLM on HN front page
Carmine Paolino
Author, founder
Chatwithwork
Berlin
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March 16, 2025
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March 26, 2025
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March 26, 2025
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March 26, 2025
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March 26, 2025
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March 26, 2025
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March 26, 2025
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YC partner pitches Rails
March 26, 2025
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January 22, 2025
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.new Stack: Remix, Wasm, Rails
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January 22, 2025
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.new Stack: Remix, Wasm, Rails
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January 22, 2025
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.new Stack: Remix, Wasm, Rails
Albert Pai and
Eric Simmons
Co-founders
San Francisco
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January 22, 2025
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February 13, 2025
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February 13, 2025
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February 13, 2025
raised
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$1M?
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February 13, 2025
raised
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$1M?
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5M?
February 13, 2025
raised
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$1M?
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5M?
50M 🤯
February 13, 2025
raised
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Nikita Savrov
co-founder&CTO
Maryland, US
$1M?
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5M?
50M 🤯
February 13, 2025
raised
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Nikita Savrov
co-founder&CTO
Maryland, US
$1M?
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-Ruby on Rails monolith with Turbo
-Experimental mobile app on
Turbolinks
-JS frameworks, microfrontends
and Flutter in the mix
5M?
50M 🤯
February 13, 2025
raised
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March 3, 2025
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March 3, 2025
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plans an IPO March 3, 2025
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Ryan King
Co-founder&CTO
San Francisco
plans an IPO March 3, 2025
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Ryan King
Co-founder&CTO
San Francisco
plans an IPO March 3, 2025
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Ryan King
Co-founder&CTO
San Francisco
plans an IPO March 3, 2025
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Ryan King
Co-founder&CTO
San Francisco
plans an IPO March 3, 2025
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SO, WHERE ARE WE?
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SO, WHERE ARE WE?
Startups on Rails are growing
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SO, WHERE ARE WE?
Startups on Rails are growing
Ruby open source is getting popular
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SO, WHERE ARE WE?
Startups on Rails are growing
Ruby open source is getting popular
Investors support Rails
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Visibility of Technology
Gartner Hype Cycle
Time
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Visibility of Technology
Gartner Hype Cycle
Time
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Peak of in
fl
ated
expectations
Visibility of Technology
Gartner Hype Cycle
Time
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Peak of in
fl
ated
expectations
Visibility of Technology
Trough of
disillusionment
Gartner Hype Cycle
Time
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Peak of in
fl
ated
expectations
Visibility of Technology
Trough of
disillusionment
S
lop
e
of
enlightenm
ent
Gartner Hype Cycle
Time
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Peak of in
fl
ated
expectations
Visibility of Technology
Trough of
disillusionment
S
lop
e
of
enlightenm
ent
Plateau of
productivity
Gartner Hype Cycle
Time
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Peak of in
fl
ated
expectations
Visibility of Technology
Trough of
disillusionment
S
lop
e
of
enlightenm
ent
Plateau of
productivity
Gartner Hype Cycle
Time
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9
Peak of in
fl
ated
expectations
Visibility of Technology
Trough of
disillusionment
S
lop
e
of
enlightenm
ent
Plateau of
productivity
Pragmatic
adoption
Gartner Hype Cycle
Time
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Peak of in
fl
ated
expectations
Visibility of Technology
Trough of
disillusionment
S
lop
e
of
enlightenm
ent
Plateau of
productivity
Pragmatic
adoption
Gartner Hype Cycle
Time
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Time for intros!
Irina (Ira) Nazarova
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Time for intros!
Irina (Ira) Nazarova
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CEO at Evil Martians
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Time for intros!
Irina (Ira) Nazarova
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CEO at Evil Martians
Co-founder at AnyCable
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Time for intros!
Irina (Ira) Nazarova
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CEO at Evil Martians
Co-founder at AnyCable
Org of SF Ruby meetup
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LET’S HEAR FROM YOU!
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LET’S HEAR FROM YOU!
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LET’S HEAR FROM YOU!
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This is
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This is
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-Ruby on Rails startup
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This is
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-Ruby on Rails startup
-YC S08 ⚡
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This is
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-Ruby on Rails startup
-YC S08 ⚡
-Realtime powered by
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This is
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Brad Gessler
Co-founder
San Francisco
-Ruby on Rails startup
-YC S08 ⚡
-Realtime powered by
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This is
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Brad Gessler
Co-founder
San Francisco
-Ruby on Rails startup
-YC S08 ⚡
-Realtime powered by
🔌 Terminalwire
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PLEASURE TO MEET YOU!
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These are were my interview questions for founders
PLEASURE TO MEET YOU!
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These are were my interview questions for founders
Founders who chose Rails in 2021 and later
PLEASURE TO MEET YOU!
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NOT THESE FOUNDERS
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NOT THESE FOUNDERS
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WHY RUBY AND RAILS?
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“SOMETHING I SPENT HALF A YEAR
BUILDING WITH JAVA,
I BUILT IN ONLY 2 MONTHS…
WHEN LEARNING RAILS”
Thiago Diniz
Speed to Market
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“AFTER TRYING SCALA AND
OTHER FRAMEWORKS, RAILS
ALLOWED ME TO FOCUS ON
BUSINESS LOGIC RATHER THAN
CONFIGURATION”
Bjarke Vad Andersen
Convention over configuration
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“RAILS IS THE GROWN
-
UP IN
THE ROOM: IT IS BATTLE
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TESTED WITH YEARS AND
YEARS OF CARE PUT INTO IT”
Trent Kocurek
Battle-Tested Reliability
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“RAILS DEVS TEND TO TAKE ON
PM TASKS AND UNDERSTAND
THE BUSINESS NEEDS”
Aaron Snyder
Entrepreneurial culture
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"I LIKE THE MAJESTIC
MONOLITH"
Ian Se
ff
erman
Monolith Sanity
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“HOTWIRE SOLIDIFIED RAILS
FOR THE NEXT 10 YEARS”
Ryan Kulp
Modern Frontend Solutions
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“RUBY IS OVER
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REPRESENTED
IN THE STARTUPS THAT GOT
SUCCESSFUL”
Kelly Sutton
Startup Success Correlation
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“A HUGE UNLOCK OF
CREATIVITY IN USING AI IS
GOING TO HAPPEN IN FLEXIBLE
LANGUAGES LIKE RUBY”
Scott Werner
Vision in AI
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“EVENTUALLY PEOPLE WILL
REALIZE THAT THESE
SUCCESSFUL COMPANIES
HAVE BEEN BUILDING ON
RAILS ALL ALONG”
Glenn Espinosa
Rails is a secret superpower
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WHAT’S MISSING?
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Peak of in
fl
ated
expectations
Visibility
Trough of
disillusionment
S
lop
e
of
enlightenm
ent
Plateau of
productivity
Pragmatic
adoption
Gartner Hype Cycle
Time
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LET’S DO PRAGMATIC
ENLIGHTENMENT
Post-hype Rails
We don’t need to be
purists or over-hype
anything
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IT’S UP TO US
Post-hype Rails
We can build the missing pieces
and integrate them into Rails
while preserving the DX and
productivity
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Post-hype Rails
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Post-hype Rails
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TOP-4 MISSING
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#4 Frontend Experience
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Polished, documented, and
cohesive frontend story:
#4 Frontend Experience
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Polished, documented, and
cohesive frontend story:
#4 Frontend Experience
-Better Hotwire documentation and best
practice (“it takes weeks until it clicks”)
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Polished, documented, and
cohesive frontend story:
#4 Frontend Experience
-Better Hotwire documentation and best
practice (“it takes weeks until it clicks”)
-High-quality UI components (“ShadCN for
Rails”)
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Polished, documented, and
cohesive frontend story:
#4 Frontend Experience
-Better Hotwire documentation and best
practice (“it takes weeks until it clicks”)
-High-quality UI components (“ShadCN for
Rails”)
-Patterns for building reactive interfaces
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Polished, documented, and
cohesive frontend story:
#4 Frontend Experience
-Better Hotwire documentation and best
practice (“it takes weeks until it clicks”)
-High-quality UI components (“ShadCN for
Rails”)
-Patterns for building reactive interfaces
-Design aesthetic of sca
ff
olds and UI kits
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Polished, documented, and
cohesive frontend story:
#4 Frontend Experience
-Better Hotwire documentation and best
practice (“it takes weeks until it clicks”)
-High-quality UI components (“ShadCN for
Rails”)
-Patterns for building reactive interfaces
-Design aesthetic of sca
ff
olds and UI kits
-Integration with JS frameworks (Inertia)
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Polished, documented, and
cohesive frontend story:
#4 Frontend Experience
-Better Hotwire documentation and best
practice (“it takes weeks until it clicks”)
-High-quality UI components (“ShadCN for
Rails”)
-Patterns for building reactive interfaces
-Design aesthetic of sca
ff
olds and UI kits
-Integration with JS frameworks (Inertia)
⚡ hotwire.io
⚡ rubyui.com
⚡ inertia-rails.dev
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Today is packed with talks on Rails frontend
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Hotwire guru
Today is packed with talks on Rails frontend
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Hotwire guru
Hotwire talk
Today is packed with talks on Rails frontend
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Hotwire guru
Hotwire talk
Hotwire talk
Today is packed with talks on Rails frontend
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Hotwire guru
Hotwire talk
Hotwire talk
Inertia talk
Today is packed with talks on Rails frontend
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Hotwire guru
Hotwire talk
Hotwire talk
Inertia talk
Today is packed with talks on Rails frontend
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Tomorrow brings more!
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Hotwire Keynote
Tomorrow brings more!
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#3 Performance And Scale
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Prescriptive guidance or
tooling:
#3 Performance And Scale
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Prescriptive guidance or
tooling:
#3 Performance And Scale
-Can we have a way to achieve
under 100ms response time for
any Rails app?
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Prescriptive guidance or
tooling:
#3 Performance And Scale
-Can we have a way to achieve
under 100ms response time for
any Rails app?
-Parallel processing is important
for heavily I/O-bound chats with
LLMs
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Prescriptive guidance or
tooling:
#3 Performance And Scale
-Can we have a way to achieve
under 100ms response time for
any Rails app?
-Parallel processing is important
for heavily I/O-bound chats with
LLMs
⚡ github.com/socketry/async
⚡ byroot.github.io
⚡ github.com/socketry/
async-cable
⚡ github.com/anycable/
anycable
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#2 AI Tooling
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#2 AI Tooling
THIS IS STILL TOO EARLY
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#2 AI Tooling
THIS IS STILL TOO EARLY
NO, IT’S TOO LATE!
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#2 AI Tooling
THIS IS STILL TOO EARLY
NO, IT’S TOO LATE!
⚡ github.com/crmne/
ruby_llm
⚡ github.com/sublayerapp/
sublayer
⚡ github.com/patterns-ai-
core/langchainrb
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#2 AI Tooling
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Integration with “AI middleware”
#2 AI Tooling
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Integration with “AI middleware”
#2 AI Tooling
-Connectivity between Rails monolith and Python
services built by data engineers “AI middleware”
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Integration with “AI middleware”
#2 AI Tooling
-Connectivity between Rails monolith and Python
services built by data engineers “AI middleware”
Data
engineering &
Data Science
Product
engineering
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#2 AI Tooling
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LLM Evals in Ruby
#2 AI Tooling
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LLM Evals in Ruby
-Gem to test prompts, with built-in prompt
versioning
#2 AI Tooling
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LLM Evals in Ruby
-Gem to test prompts, with built-in prompt
versioning
-Internal dashboard to monitor performance
#2 AI Tooling
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LLM Evals in Ruby
-Gem to test prompts, with built-in prompt
versioning
-Internal dashboard to monitor performance
-Upload a dataset to check against locally
#2 AI Tooling
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LLM Evals in Ruby
-Gem to test prompts, with built-in prompt
versioning
-Internal dashboard to monitor performance
-Upload a dataset to check against locally
-Run it on production to check against production
data
#2 AI Tooling
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LLM Evals in Ruby
-Gem to test prompts, with built-in prompt
versioning
-Internal dashboard to monitor performance
-Upload a dataset to check against locally
-Run it on production to check against production
data
#2 AI Tooling
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LLM Evals in Ruby
-Gem to test prompts, with built-in prompt
versioning
-Internal dashboard to monitor performance
-Upload a dataset to check against locally
-Run it on production to check against production
data
#2 AI Tooling
⚡ github.com/kieranklaassen/leva
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RAG tooling
#2 AI Tooling
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RAG tooling
-Generating and managing
embeddings
#2 AI Tooling
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RAG tooling
-Generating and managing
embeddings
-Rails-native tools for
document ingestion,
chunking, and
preprocessing
#2 AI Tooling
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RAG tooling
-Generating and managing
embeddings
-Rails-native tools for
document ingestion,
chunking, and
preprocessing
-Active Record
embedding?
#2 AI Tooling
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RAG tooling
-Generating and managing
embeddings
-Rails-native tools for
document ingestion,
chunking, and
preprocessing
-Active Record
embedding?
# A concept of Active Record Embedding
class Post < ApplicationRecord
has_one_attached :pdf
has_embedding :content, service: :mini_llm
has_embedding :pdf, service: :openai,
chunked: {recursive: true, engine: :baran}
end
# Usage example
post.content_embedding.vector # Returns vector
post.pdf_chunks # Return chunks w/ vectors
Post.with_similar_content(query, limit: 5) # Search similar records
#2 AI Tooling
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RAG tooling
-Generating and managing
embeddings
-Rails-native tools for
document ingestion,
chunking, and
preprocessing
-Active Record
embedding?
# A concept of Active Record Embedding
class Post < ApplicationRecord
has_one_attached :pdf
has_embedding :content, service: :mini_llm
has_embedding :pdf, service: :openai,
chunked: {recursive: true, engine: :baran}
end
# Usage example
post.content_embedding.vector # Returns vector
post.pdf_chunks # Return chunks w/ vectors
Post.with_similar_content(query, limit: 5) # Search similar records
#2 AI Tooling
⚡ github.com/patterns-ai-core/langchainrb
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RAG tooling
-Generating and managing
embeddings
-Rails-native tools for
document ingestion,
chunking, and
preprocessing
-Active Record
embedding?
# A concept of Active Record Embedding
class Post < ApplicationRecord
has_one_attached :pdf
has_embedding :content, service: :mini_llm
has_embedding :pdf, service: :openai,
chunked: {recursive: true, engine: :baran}
end
# Usage example
post.content_embedding.vector # Returns vector
post.pdf_chunks # Return chunks w/ vectors
Post.with_similar_content(query, limit: 5) # Search similar records
#2 AI Tooling
⚡ github.com/patterns-ai-core/langchainrb
⚡ github.com/ankane/neighbor
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#2 AI Tooling
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AI agent tooling
#2 AI Tooling
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AI agent tooling
-Work
fl
ow orchestration: long running,
durable, resumable, testable, performant
work
fl
ows
#2 AI Tooling
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AI agent tooling
-Work
fl
ow orchestration: long running,
durable, resumable, testable, performant
work
fl
ows
-Agent memory and conversational state
management
#2 AI Tooling
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AI agent tooling
-Work
fl
ow orchestration: long running,
durable, resumable, testable, performant
work
fl
ows
-Agent memory and conversational state
management
-Tracking AI agent performance, logging
interactions, and analyzing response quality
#2 AI Tooling
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AI agent tooling
-Work
fl
ow orchestration: long running,
durable, resumable, testable, performant
work
fl
ows
-Agent memory and conversational state
management
-Tracking AI agent performance, logging
interactions, and analyzing response quality
⚡ github.com/
fractaledmind/
acidic_job
#2 AI Tooling
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AI agent tooling
-Work
fl
ow orchestration: long running,
durable, resumable, testable, performant
work
fl
ows
-Agent memory and conversational state
management
-Tracking AI agent performance, logging
interactions, and analyzing response quality
⚡ github.com/
fractaledmind/
acidic_job
⚡ activeagents.ai
#2 AI Tooling
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#2 AI Tooling
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MCP tooling
#2 AI Tooling
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MCP tooling
MCP is a “self-documented API”
protocol that an LLM-operated
system can use to interact with
your app
#2 AI Tooling
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MCP tooling
How many of the
first MCPs are built
for Ruby backends?
MCP is a “self-documented API”
protocol that an LLM-operated
system can use to interact with
your app
#2 AI Tooling
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MCP tooling
How many of the
first MCPs are built
for Ruby backends?
MCP is a “self-documented API”
protocol that an LLM-operated
system can use to interact with
your app
Stripe, GitHub,
Gitlab, Block!
#2 AI Tooling
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MCP tooling
-Ruby SDK to build an MCP server
How many of the
first MCPs are built
for Ruby backends?
MCP is a “self-documented API”
protocol that an LLM-operated
system can use to interact with
your app
Stripe, GitHub,
Gitlab, Block!
#2 AI Tooling
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MCP tooling
-Ruby SDK to build an MCP server
-MCP generator from Swagger How many of the
first MCPs are built
for Ruby backends?
MCP is a “self-documented API”
protocol that an LLM-operated
system can use to interact with
your app
Stripe, GitHub,
Gitlab, Block!
#2 AI Tooling
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MCP tooling
-Ruby SDK to build an MCP server
-MCP generator from Swagger
-MCP proxy
How many of the
first MCPs are built
for Ruby backends?
MCP is a “self-documented API”
protocol that an LLM-operated
system can use to interact with
your app
Stripe, GitHub,
Gitlab, Block!
#2 AI Tooling
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MCP tooling
-Ruby SDK to build an MCP server
-MCP generator from Swagger
-MCP proxy
How many of the
first MCPs are built
for Ruby backends?
MCP is a “self-documented API”
protocol that an LLM-operated
system can use to interact with
your app
Stripe, GitHub,
Gitlab, Block!
⚡ github.com/yjacquin/fast-mcp
⚡ github.com/funwarioisii/mcp-rb
#2 AI Tooling
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“WE NEED A NEW REASON TO
BE VOCAL ABOUT USING
RUBY
–
DESPITE THE
SCEPTICISM”
#1 …
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Peak of in
fl
ated
expectations
Time
Visibility
Trough of
disillusionment
S
lop
e
of
enlightenm
ent
Plateau of
productivity
Gartner Hype Cycle
#1 …
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Peak of in
fl
ated
expectations
Time
Visibility
Trough of
disillusionment
S
lop
e
of
enlightenm
ent
Plateau of
productivity
Gartner Hype Cycle
REMEMBER: SLOPE
OF ENLIGHTENMENT
💡🕯☀
#1 …
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#1 Pragmatic Enlightenment
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Let’s share success stories that
demonstrate enduring value of Rails
#1 Pragmatic Enlightenment
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Let’s share success stories that
demonstrate enduring value of Rails
#1 Pragmatic Enlightenment
-Companies: talk about Ruby and Rails in your technical
blogs and mention it in press releases and on socials
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Let’s share success stories that
demonstrate enduring value of Rails
#1 Pragmatic Enlightenment
-Companies: talk about Ruby and Rails in your technical
blogs and mention it in press releases and on socials
-We need more Ruby on Rails bloggers on YouTube
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Let’s share success stories that
demonstrate enduring value of Rails
#1 Pragmatic Enlightenment
-Companies: talk about Ruby and Rails in your technical
blogs and mention it in press releases and on socials
-We need more Ruby on Rails bloggers on YouTube
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Let’s share success stories that
demonstrate enduring value of Rails
#1 Pragmatic Enlightenment
-Companies: talk about Ruby and Rails in your technical
blogs and mention it in press releases and on socials
-We need more Ruby on Rails bloggers on YouTube
⚡ Ken Greeff, GoRails, SupeRails on YouTube
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Let’s share success stories that
demonstrate enduring value of Rails
#1 Pragmatic Enlightenment
-Companies: talk about Ruby and Rails in your technical
blogs and mention it in press releases and on socials
-We need more Ruby on Rails bloggers on YouTube
⚡ Ken Greeff, GoRails, SupeRails on YouTube
⚡ “Patterns of application development using AI” Obie Fernandez
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Let’s share success stories that
demonstrate enduring value of Rails
#1 Pragmatic Enlightenment
-Companies: talk about Ruby and Rails in your technical
blogs and mention it in press releases and on socials
-We need more Ruby on Rails bloggers on YouTube
⚡ Ken Greeff, GoRails, SupeRails on YouTube
⚡ “Patterns of application development using AI” Obie Fernandez
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Last 12 months
Ruby conferences: 38 in 34 locations
Ruby meetups: 639 in 127 locations
#1 Pragmatic Enlightenment
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Last 12 months
Ruby conferences: 38 in 34 locations
Ruby meetups: 639 in 127 locations
#1 Pragmatic Enlightenment
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53
Last 12 months
Ruby conferences: 38 in 34 locations
Ruby meetups: 639 in 127 locations
#1 Pragmatic Enlightenment
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53
Last 12 months
Ruby conferences: 38 in 34 locations
Ruby meetups: 639 in 127 locations
#1 Pragmatic Enlightenment
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Last 12 months
Ruby conferences: 38 in 34 locations
Ruby meetups: 639 in 127 locations
#1 Pragmatic Enlightenment
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⚡ rubyconferences.org
⚡ rubyvideo.dev
Last 12 months
Ruby conferences: 38 in 34 locations
Ruby meetups: 639 in 127 locations
#1 Pragmatic Enlightenment
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LET’S ADD SOME
NEW NAMES
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#3 Performance And Scale
#1 Pragmatic Enlightenment
#4 Frontend Experience
#2 AI Tooling
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WHAT ARE YOU BUILDING NEXT?
#3 Performance And Scale
#1 Pragmatic Enlightenment
#4 Frontend Experience
#2 AI Tooling
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WHAT ARE YOU BUILDING NEXT?
#3 Performance And Scale
#1 Pragmatic Enlightenment
#4 Frontend Experience
#2 AI Tooling
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56
WHAT ARE YOU BUILDING NEXT?
#3 Performance And Scale
#1 Pragmatic Enlightenment
#4 Frontend Experience
#2 AI Tooling
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56
WHAT ARE YOU BUILDING NEXT?
#3 Performance And Scale
#1 Pragmatic Enlightenment
#4 Frontend Experience
#2 AI Tooling
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WHAT ARE YOU BUILDING NEXT?
#3 Performance And Scale
#1 Pragmatic Enlightenment
#4 Frontend Experience
#2 AI Tooling
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Thank you! Reach out:
[email protected]
inazarova on X, Bluesky
Irina Nazarova on Linkedin
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