Beyond Craft - Revisiting Our Relationship with Software Craft [NewCrafts 2023]

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BEYOND CRAFT CYRILLE MARTRAIRE arolla.fr @arollafr REVISITING OUR RELATIONSHIP WITH SOFTWARE CRAFT

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:FBS 40'58"3& $3"'5

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Wow. That’s very old, isn’t it?

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http://www.meetup.com/paris-software-craftsmanship/ PARIS SOFTWARE CRAFTERS COMMUNITY Since 2011. 4600+ members

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That’s a lot of people, isn’t it?

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‘CRAFT’ IN THE NAME OF THE BEST CONFS

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@AROLLAFR CRAFT?

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@AROLLAFR DO WE STILL NEED TO CARE?

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Let’s explore that together!

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arolla.fr @arollafr

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arolla.fr @arollafr TDD BDD DDD 100% CRAFT SINCE 2009

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arolla.fr @arollafr crafting architecture

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@cyriux

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@AROLLAFR CRAFT?

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Software Development, 1999

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Enterprise Java Beans Vendor-driven complexity

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”Complexity is cool” DAO Factory (Factory)

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Planning rulz!

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Detailed Design Specs

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UML/MDA! ”Coding is a dirty job”

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”I wanna become project manager after 2 years” Rando m Junior Developer

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Ward Cunningham

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Kent Beck

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What if we worked differently?

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PATTERNS + WIKI + XP + CRC Cards (…)

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AGILE MANIFESTO

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in reaction to abuses

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WHEW! (saved my life)

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Agile is now The New Norm

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Now you’re a Scrum Master!

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Ooops!!! we’ve done it again!

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http://fr.slideshare.net/MozaicWorks/sandro-manucos-software-craftmanship-pdf

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"Code does not matter" Scrum gone bad

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Software Craftsmanship Manifesto

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Engineering practices matter!

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in reaction to non-sense

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software craft

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REACTION a

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REACTION a to a REACTION

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Software Craftsmanship

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Software Craftsmanship

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Software Craft

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@CYRIUX Craft RAISING THE BAR WORKING CODE IS NOT ENOUGH

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Build the right thing. Build it right.

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PROGRAMMING BY COINCIDENCE

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CRAFT = Desirable benefits

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@CYRIUX BENEFITS TIME TO MARKET RELEASE FREQUENCY DEFECTS BY RELEASE TIME TO RECOVER EASIER EVOLUTIONS & MAINTENANCE REDUCED COST OVER TIME MORE VALUES DELIVERED DIGITAL FRUGALITY

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CRAFT = selected PRACTICES

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@CYRIUX PRACTICES SELECTING THE BEST TECHNIQUES AVAILABLE NOW

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TDD BDD DDD Legacy Continuous Delivery Software Craftsmanship FP -style Clean Code since 2009 DevOps

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The best techniques available often look like heresy

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Test only once it’s Done Start with tests

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Test = Just enough Speci fi cation Code = Just enough Code Refactor = Just enough Design TDD

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TDD - MATURITY SCALE NO TEST TEST-AFTER TEST-FIRST TDD

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Pair-Programming

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Driver-Navigator

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"Full Team, Full Throttle "

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TDD BDD DDD Legacy Continuous Delivery Software Craftsmanship FP -style Clean Code DevOps

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http://nw.wea.org.uk/blogs/extending_learning_coversations.php •Face to face IRL (travel ) •Telephon e •Cha t •Email Langage métier Conversations

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The 3 amigos

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BDD Collaboration. Early. Continuously.

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@CYRIUX devops Ops Dev

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DevOps. Collaboration. Early.

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DevOps. Automation.

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DevOps. Automation. Automated tests. A lot.

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TDD BDD DDD Legacy Continuous Delivery Software Craftsmanship FP -style Clean Code

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Wanna change the code? Code says No.

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Legacy Code Legacy Teams

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TDD BDD DDD Legacy Continuous Delivery Software Craftsmanship FP -style Clean Code

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Modular architectures

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@cyriux Fraud Détection Payment Gift Cards n mpany ting Review Shopping Cart Bounded Contexts

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Progressive Legacy Modernization

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BIG BANG

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@cyriux Fraud Détection Payment Gift Cards n mpany ting Review Shopping Cart REWRITE EXTERNALIZE KEEP AS-IS KEEP EXTRACT EXTRACT AS LIB

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TDD BDD DDD Legacy Continuous Delivery Software Craftsmanship FP -style Clean Code DevOps

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SCRUM + CRAFT = poor-man XP

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CRAFT = ADAPT TO MODERN TECHS

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@CYRIUX C, C++

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@CYRIUX C, C++ SMALLTALK, JAVA

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@CYRIUX RIGID & SLOW C++, ASM MALLEABLE & FAST JAVA, C#, JS, PYTHON

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@CYRIUX RIGID & SLOW C++, ASM MALLEABLE & FAST JAVA, C#, JS, PYTHON Plan, execute Specs, code, test Separate tasks Start - Finish Iterate Specs+code+test Collaborate Continuous

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Scrum ⋍ + Software Craft XP

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+ something more…

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”Learn to say NO”

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107 ”NO”

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CRAFT = PROFESSIONALISM

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Hygiene & Safety = Test + Refactor

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Always changing Technologies

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Shall we always re-learn everything?

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&WFSHSFFO "UUJUVEFT

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THE SYSTEM = THE SOFTWARE + THE PEOPLE

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Socio-Technical Architecture, Team Topologies

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Baby Steps

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micro-Size

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micro -(service)

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Taste for simplicity

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The more standard the better fogus @fogus

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Naming things is hard & important

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Frugal dependencies

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If something hurts, do it all the time!

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Deployment is dangerous Deploy all the time

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Continuous Delivery

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1PSUBCMF "UUJUVEFT

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$SBGUJOH BMMUIF UIJOHT

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Infra as Code.

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Infra as Code. CRAFT

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CRAFTING Data Products

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(code, data)

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(code, data) CRAFT General Purpose software development

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(code, data) CRAFT CRAFT Data Engineering software development

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Testing data?

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Software developers have long known that automated testing is essential for managing complex codebases. Great Expectations brings the same discipline, confidence, and acceleration to data science and data engineering teams. UNIT TESTS FOR DATA: DEEQU, GREAT EXPECTATIONS

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CRAFTING ML Solutions

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Old Fashioned Code Machine Learning

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”It’s new and totally different, we don’t need your old practices”

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https://research.google/pubs/pub43146/

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Machine Learning: The High Interest Credit Card of Technical Debt ”Using the framework of technical debt , • boundary erosion, • entanglement, • hidden feedback loops, • undeclared consumers, • data dependencies, • changes in the external world, • and a variety of system-level anti-patterns” unfamiliar technology… …familiar stuff indeed!

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CRAFT = Industry Impact

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$SBGUPXO BCVTFT

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Dogmatism.

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DRY: Don’t Repeat Yourself But: DRY means Coupling

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No Duplication in the small No Coupling in the large

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EVERYTHING IS CONTEXTUAL

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there’s no practice BEST

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Learn a practice, and learn WHEN to use it or not

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BE CAT-MATIC NOT DOG-MATIC

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Elitism.

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Teach / Coach / Help everyone!

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Toxic leaders.

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Quit / Fire.

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Ethics of executing other people’s business ideas.

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Entrepreneurship: why not?

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Stuck in time.

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What about innovations?

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"Oh it’s just the same old thing" With a new name.

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Cloud "Oh it’s just hosting"

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@CYRIUX @CYRIUX No more. Highly managed cloud is about new opportunities: speed, elasticity, fast innovation, cost structure… This is achieved through a new architectural style. "Cloud is just hosting"

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serverless

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80% same old thing. 20% different. Still a game-changer overall.

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"DUJWFMZ EJHXIBU`T SFBMMZ OPWFM

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Remember how automated memory management changed our lives?

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Event-Driven Architecture: "Oh it’s just async messaging"

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Event Bus / Observer pattern Ticke t Booked Bookin g Service Bookin g Confirmed Inventor y Service Bookin g Cancelled Capacit y Updated Ticketin g Service CHANGE IN ONLY 1 PLACE

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Event Bus / Observer pattern Ticke t Booked Bookin g Service Bookin g Confirmed Inventor y Service Bookin g Cancelled Capacit y Updated Ticketin g Service Notificatio n Service CHANGE IN ONLY 1 PLACE

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01&/$-04& 13*/$*1-& 1MVH VOQMVHTFSWJDFT CHANGES IN ONLY 1 PLACE

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Actively dig what’s really novel

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No code / low code? "Oh it’ll never work!"

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chaos engineering "Oh WTF?!"

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Testing in production https://www.infoq.com/presentations/testing-production-2018/

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Progress HERESY through

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”The line between innovation and stupidity is a thin line.” OH on Twitter by @bertails

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LLM’s (ChatGPT, Copilot)

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*U`TBCPVU $0.1-&9*5: SFBMMZ

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COMPLEXITY THINKING = OUR NEW OPERATING SYSTEM

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SAFE-TO-FAIL PROBES DIRECTION & COHERENCE GRANULARITY AMPLIFICATION & DAMPENING WHAT DIDN’T WORK BUT COULD WORK NOW? … Cynefin

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20 YEARS AGO!

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Wardley Mapping Residuality Theory

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3&$"1

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KNOW THE HISTORY TO UNDERSTAND THINGS IN CONTEXT

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SOFTWARE CRAFT AS NECESSARY IN A CONTEXT

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SOFTWARE CRAFT STILL WORTH LEARNING (AMONG OTHER THINGS)

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DON’T GET STUCK IN 2009

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EXPECT TO BE SURPRISED BY GENUINE NOVELTY

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"DUJWFMZEJH XIBU`TSFBMMZ OPWFM*/UIF OFXTUVGG

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‘CRAFT’ WILL END UP MEANING DIFFERENT THINGS TO DIFFERENT PEOPLE

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WHAT WILL WE FOCUS ON AFTER WE NO LONGER FOCUS ON CRAFT?

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THE REAL PURPOSE OF NEWCRAFTS?

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Thanks! Cyrille MARTRAIRE @cyriux

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References • Sandro Mancuso ”Agile Hangover” : https://www.infoq.com/articles/mancuso-software-craftsman/ • McKinsey Developer Velocity Index: https://www.mckinsey.com/industries/technology-media-and- telecommunications/our-insights/developer-velocity-at-work-key-lessons-from-industry-digital-leaders#/ • Mob Programming (Woody Zuill): https://mobprogramming.org/ • Testing in Production (Charity Major): https://www.infoq.com/presentations/testing-production-2018/ • Functional Core Imperative Shell: https://www.destroyallsoftware.com/screencasts/catalog/functional-core- imperative-shell • Property-Based Testing: https://blog.jessitron.com/2013/04/25/property-based-testing-what-is-it • Machine Learning: The High Interest Credit Card of Technical Debt: https://ai.google/research/pubs/pub43146 • Weird ideas to try in your team: @weirddev (Twitter) • My book: Living Documentation: http://www.informit.com/livingdoc • Université Devoxx 2018 sur l’architecture (YouTube, FR): https://www.youtube.com/watch?v=1igv2rHGKfo