"Clean Architecture: Stories of Pain and Joy From the Codebase", Dm...

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Senior Software Developer
Dmytro Bolharov
14+ Years
Experienc
e
…
Good Day, Everyone!

Sigma Software Unity Fund - благодійний
корпоративний фонд, створений міжнародною ІТ
консалтинговою компанією Sigma Softwa...

Prime Directive can be placed here…
…But why not?
“Regardless of what we discover, we understand and
truly believe that ev...

→Legacy Monolith ERP System with CMS capabilites for E-Commerce
→Highly Customisable
→Multi-languague, distributed in USA,...

→Get rid of own datacenter, move to AWS cloud
→Lower the application cost
→Upspeed customer onboarding
Initial Request

→ Get rid of own datacenter, move to AWS cloud
→Configure Jenkins to deploy to AWS EC2
→Migrate data to AWS RDS
→ Lower th...

Slow Delivery
difficult to estimate
Slow Build &
Deployment
Starting from 2,5 hrs
High Bug
Rate
~20%
Difficult to test Lot...

Slow Delivery
difficult to estimate
Slow Build &
Deployment
Starting from 2,5 hrs
High Bug
Rate
~20%
Difficult to test Lot...

• Hexagonal Architecture by
Alistair Cockburn
• Onion Architecture by Jeffrey
Palermo
• Screaming Architecture by
Robert C...

→ Set goals
→ Bug rate should not exceed 5%
→ Improve delivery time by 40%
→ Increase application performance by 25% min
→...

→Biases around ORM
→Procedural code style habbits
→SOLID is hard
→Unit testing is waste of time
→Infra is for DevOps, not ...

Delivery Time Deffect Rate Infrastructure Cost
0
20
40
60
80
100
120
140
2 months results
Before After
Sad Statistics

→ Legacy instances on EC2 are still not cheap
→ Every service required it’s own AWS Fargate containers
→ .Net cold start w...

Page CodeBehind
Database
File Server
Business layer
Front WebAPI Controller
Application
Layer
Domain
Layer
Infrastructur
e...

Delivery Time Deffect Rate Infrastructure
Cost
0
20
40
60
80
100
120
140
2 months results
Before After
Delivery Time Deffe...

→ Strangler fig pattern might be a good choice
→ Your team must share the same goals and be prepared
→ Clean architecture ...

→Distributed application
→ Team per microservice
→ Clean / Hexagonal architectures
→ Senior mature team
→ Excellent infras...

Migration
s

Application
layer

Infra layer

→ Test Driven Development is easier
→ Separation of concerns creates well defined boundaries
→ Easier to couple / decouple...

→High complexity (easy to overengineer)
→“Really?” ©
→Debugging can be difficult
→Especially in distributed environment
→A...

Criterion / Pattern
Clean
Architecture
Hexagonal
Architecture
Onion
Architecture
Screaming
Architecture
DCI BCE
🧠 Domain f...

→ The Clean Code Blog
→Hexagonal Architecture
→Growing Object Oriented Software
→Onion Architecture
→Screaming Architectur...

Questions?

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