Florian Stefan. Reducing technical debt in software architecture

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Florian Stefan, Software Architect at eBay Reducing technical debt in software architecture Florian works as a Software Architect for the eBay Classifieds Group. He is responsible for analyzing technical debt and for transforming complex systems into loosely coupled services to improve change management and time-to-market. His focus lies in building JVM-based services in a cloud environment, using functional programming techniques and Domain Driven Design principles. What Florian loves about his job is to tackle complex problems and to come up with solutions that are helpful and easy to understand. He doesn’t like to work with Rock Star developers – but he enjoys working with autonomous teams and tries to help them make the right decisions. In his spare time, he enjoys spending time with his family, traveling and Punk Rock.

Reducing Technical Debt
in Software Architecture
Florian Stefan ● @f_s_t_e_f_a_n

Reducing Technical Debt
in Software Architecture
Platform Business Model

Linear Business Model
Reducing Technical Debt
in Software Architecture

Screaming Architecture
“Just as the plans for a house or a library scream
about the use cases of those buildings, so should the
architecture of a software application scream about
the use cases of the application.”
(Robert C. Martin)
Reducing Technical Debt
in Software Architecture

Legacy Software
“Having legacy software is often a sign of success.
Your business was successful to last long enough
for your software to become legacy.”
(Sam Newman)
Reducing Technical Debt
in Software Architecture

C
ase
Stud
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Reducing Technical Debt
in Software Architecture

Reducing Technical Debt
in Software Architecture
Legacy
“Systems & Functions with a design
contrary to architectural principles.”

Reducing Technical Debt
in Software Architecture
Technical Debt
“Legacy Systems & Functions that
could threaten our business success.”

(Dr. Carola Lilienthal)
Reducing Technical Debt
in Software Architecture

Reducing Technical Debt
in Software Architecture
Rigidity Fragility Repetition Complexity

Communicator
Leader
Developer
Systems Focused
Entrepreneur
Strategic
Technologist
(Patrick Kua)
Reducing Technical Debt
in Software Architecture

Strategy Principles Practices
Reducing Technical Debt
in Software Architecture

Architectural
Principles
Technical Debt
Report
Clearance
Commitment
Balanced
Scorecard
Clearance
Sponsoring
Reducing Technical Debt
in Software Architecture

changes for
different reasons
Reducing Technical Debt
in Software Architecture

Principles PracticesStrategy
Organize around Business Capabilities
“Develop a ubiquitous language inside bounded
contexts - the maximal extent of a concept so
that the concept remains consistent.”

Principles PracticesStrategy
Event
Storming
Domain
Storytelling
Organizational
Structure
Customer
Touchpoints

Principles PracticesStrategy
Shared
Kernel
Customer/
Supplier
Published
Language
Anticorruption
Layer
Conformist

changes for
different reasons
changes at
different rates
Reducing Technical Debt
in Software Architecture

Principles PracticesStrategy
DRY Principle
“Every piece of knowledge must have
a single, unambiguous, authoritative
representation within a system.”
(Andy Hunt, Dave Thomas)

Silver Bullets
“A good developer is like a werewolf:
afraid of silver bullets.”
(Jochen Mader)
Reducing Technical Debt
in Software Architecture

Thank you!
Reducing Technical Debt
in Software Architecture

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