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Vladimir Dementyev
Evil Martians
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SPACE CONQUEST
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0 -> 1 -> 2
1897
Rocket equation
1957
Sputnik launch
1961
1st man in space
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IS YOUR PROJECT
READY TO
PUT HUMANS IN?
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github.com/palkan
2017-...
2016-...
2015-...
2015-...
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evilmartians.com
2017-...
2016-...
2015-...
2015-...
Vamos nessa!
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ONE PERSON
FRAMEWORK
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INTEGRATION BEATS COLLECTION
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PRODUCT-MARKET FIT
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PRODUCT-MARKET FIT
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SOFTWARE-
PRODUCT FIT
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SOFTWARE-PRODUCT FIT
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SPF Axiom
YOUR PRODUCT
CAN'T OUTGROW
YOUR CODEBASE
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Support for complex domain architectures
and bigger teams
GROWING PAINS
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Clear prescription on where to put business logic;
solutions for services, forms, policies...
Observability default: JSON logs, tracing, metrics...
What Rails developers at 1-2 want
First-class native async support
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GROWING PAINS
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What Rails developers at 1-2 need
Maintainability
Scalability
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MAINTAINABILITY
BY EXAMPLE
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Rails
Inertia
Svyat
IT STARTS WITH ONE
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thicket.com, a few days into the soft launch
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Rails
Inertia
Svyat
IT STARTS WITH ONE
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thicket.com, a few days into the soft launch
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TECH DEBT COMPOUNDS
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TECH DEBT COMPOUNDS
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TECH DEBT COMPOUNDS
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FIGHTING
TECH DEBT
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A not illustrated guide
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class Dashboard::CoursesController < InertiaController
def index
courses_scope = Current.user.enrolled_courses
filtered_scope = CoursesFilter.filter(courses_scope, params)
@pagy, @courses = pagy(filtered_scope)
end
end
app/controllers/dashboard/courses_controller.rb
EXAMPLE INTERFACE
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class Dashboard::CoursesController < InertiaController
def index
@courses, @current_filter = filtery(
Current.user.courses.not_removed
)
@pagy, @courses = pagy(@courses)
end
end
app/controllers/dashboard/courses_controller.rb
ACTUAL INTERFACE
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gem "rubanok"
#sortable_by
filter_spec.rb
Types-ready
class Dashboard::CoursesFilter < ApplicationFilter
process :filters do
map :states do |states:|
raw.where(state: states)
end
end
sortable_by :title, :completed_lessons_count, default: "title" do
having "enrolled_at" do |sort_direction: "asc"|
raw.order(enrollments: {purchased_at: sort_direction})
.order(id: :asc)
end
having "is_course_completed" do |sort_direction: "asc"|
col = Course.arel_table[:finished_at]
ordering = sort_direction == "desc" ? col.desc.nulls_last :
col.asc.nulls_first
raw.order(ordering).order(id: :asc)
end
end
end
app/controllers/dashboard/courses_filter.rb
FILTER OBJECT
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The Thicket Way
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gem "rubanok"
#sortable_by
filter_spec.rb
Types-ready
describe Dashboard::CoursesFilter do
context "sorting" do
it "applies default sorting (title asc)"
it "sorts by completed_lessons_count"
it "sorts by enrolled_at via purchased_at"
it "sorts by is_course_completed with NULLs"
it "falls back to default for unknown fields"
end
context "filtering" do
it "filters by state"
it "ignores empty state arrays"
end
end
spec/controllers/dashboard/courses_filter_spec.rb
FILTER OBJECT
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The Thicket Way
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gem "rubanok"
#sortable_by
filter_spec.rb
Types-ready
describe Dashboard::CoursesFilter do
context "sorting" do
it "applies default sorting (title asc)"
it "sorts by completed_lessons_count"
it "sorts by enrolled_at via purchased_at"
it "sorts by is_course_completed with NULLs"
it "falls back to default for unknown fields"
end
context "filtering" do
it "filters by state"
it "ignores empty state arrays"
end
end
spec/controllers/dashboard/courses_filter_spec.rb
FILTER OBJECT
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The Thicket Way
describe "/dashboard/courses" do
it "sorts by completed_lessons_count via CoursesFilter" d
expect do
get dashboard_courses_path(
sort_field: "completed_lessons_count",
sort_direction: "asc"
)
end.to have_filtered(student.enrolled_courses)
.with(Dashboard::CoursesFilter)
expect(response).to have_http_status(:ok)
expect(inertia.props).to include("sort_field" =>
"completed_lessons_count", "sort_direction" => "asc")
end
end
spec/requests/dashboard/courses_spec.rb
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TYPED FILTER
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MISSION COMPLETE
Extracted an abstraction layer
Introduced a convention
Improved stability and DX
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One small step toward maintainability
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MORE SMALL STEPS
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You've learned at Tropical on Rails 2026
Migrate from STI
before it's too late
Reordering using int
columns can only get
you so far
Write stronger migrations
to stop being scared
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ARCHITECTURE
DETERMINES
HOW FAST YOU CAN GO
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CARA, 20 MINUTES
AND NO AI.
NÃO AGUENTO MAIS!
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AI IS AN
AMPLIFIER
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A IA ecoa a qualidade
do seu código
Garbage in, garbage out
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Context compression
ARCHITECTURE × AI
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But does it even matter with 1M context windows?
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Context compression
Implicit harness
ARCHITECTURE × AI
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Extra layers, non-vanilla Rails.
Do agents benefit?
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EXPERIMENTS
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EXPERIMENTS
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DeepSeek sucks!
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Re-implement filtering
Same prompt/process
Unlayered vs. Layered
EXPERIMENT
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thicket.com × AI
rails-app — zsh
▐▛███▜▌ Código Claude v10.04.2026
▝▜█████▛▘ Vovas 3.7 (1M context) · Claude M
▘▘ ▝▝
> Add filtering and sorting to the student'
Requirements:
1. Add a category filter. Param: filters[ca
When present, only courses in that categ
When absent or blank, all enrolled cours
2. Add sorting. The existing default sort i
sort fields:
- "completed_lessons_count" — sorts by t
count (the completed_lessons_count col
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EXPERIMENT
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UNLAYERED LAYERED
Bugs 0 0
Mistakes 3 0
Contoller LOC 33 2
Net LOC 215 128
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TECH DEBT, GENERATED
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TECH DEBT, GENERATED
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DIMENSION UNLAYERED LAYERED
Discoverability 3–4 hops 2 hops
Isolation Shared controller
namespace, instance vars
Standalone object,
returns data
Predictability
Inconsistent inline
patterns, invented a new
variant
Uniform DSL, matches all
existing filters
Blast radius
2 files / 33
controller LOC
4 files / 2
controller LOC
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The layer didn't make the
agent smarter
It made the agent's mistakes
smaller and its correct code
cheaper
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IMPLICIT
HARNESS IS
NOT ENOUGH
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ARCHITECTURE × AI
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Pattern-oriented architecture
Architectural patterns
Design patterns
Idioms
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AI orchestration patterns
Architectural patterns
Design patterns
Idioms
ARCHITECTURE × AI
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Pattern-oriented architecture 2026
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!!!
"!!
""!
"""
AI orchestration patterns
Architectural patterns
Design patterns
Idioms
ARCHITECTURE × AI
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Pattern-oriented architecture 2026
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GUIDE THE AMPLIFIER
Processes # compound-engineering
Skills # palkan/skills, superpowers-ruby
Context enrichment # Tidewave, ruby-lsp
Trusted references
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Quality code and context in, quality code out
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SPF CHECKLIST
Architecture
that doesn't slow you down
AI-rchitecture
that keeps quality high
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What makes up point 2?
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Platform
that scales and stay resilient
Processes
that let the team deliver
SPF CHECKLIST
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What makes up point 2?
Consistent dev
environment!
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SPF CHECKLIST
Architecture
AI-rchitecture
Platform
Processes
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What makes up point 2?
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SPACE CONQUEST
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1897
Rocket equation
1957
Sputnik launch
1961
1st man in space
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SPACE CONQUEST
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1897
Rocket equation
1957
Sputnik launch
1961
1st man in space
1969
Moon landing
1971
1st space station
2026
Just checking in
2126
Welcome!
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SPF Axiom
YOUR PRODUCT CAN'T
OUTGROW YOUR CODEBASE
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SPF Axiom
YOUR PRODUCT CAN'T
OUTGROW YOUR CODEBASE
CUIDADO COM O VÃO!
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PREVENT THE GAP
Analyze # /layered-rails:analyze
Reflect # fixed bugs and stale PRs
Monitor # know your hot and weak paths
Follow Evil Martians
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Measuring the software-product fit
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OBRIGADO!
x.com/palkan_tula
x.com/evil_martians