2026_10_PHPDD_SpeedIsNotVelocity_AI_Complexity_OurRoleAsDevs.pdf

Transcript

1. Speed is not velocity AI, complexity, and our role as developer Sebastian Kurfürst, PHPDD26
10. Vibe Coding ... forget that the code even exists ... ... code grows beyond my usual comprehension ... ... It's not too bad for throwaway weekend projects ...
11. Lucas Leonel Suárez https://unsplash.com/de/fotos/ein-berg-mit-einem-wasserfall-der-aus-ihm-herauskommt-5viFVWQNf_w
12. A quarter of the W25 startup batch have 95% of their codebases generated by AI. https://techcrunch.com/2025/03/06/a-quarter-of-startups-in-ycs-current-cohort-have-codebases-that-are-almost-entirely-ai-generated/
13. coinbase.com
14. “As a concrete example, an engineer at Spotify on their morning commute from Slack on their cell phone can tell Claude to x a bug or add a new feature to the iOS app, [...] And once Claude nishes that work, the engineer then gets a new version of the app, pushed to them on Slack on their phone, so that he can then merge it to production, all before they even arrive at the o ce.” ffi fi fi Gustav Söderström, Co-CEO, CPO & CTO at Spotify https://techcrunch.com/2026/02/12/spotify-says-its-best-developers-havent-written-a-line-of-code-since-december-thanks-to-ai/
19. ff fi https://www.saechsische.de/wirtschaft/regional/groesste-investition-in-unternehmensgeschichte-in neon-eroe net-chipfabrik-in-dresden-EVIKI4WYFBDEBOVJEBYWD63SBE.html
20. Disruption Lifelong Learning Upskilling Reskilling
22. Code is produced a lot faster.
23. FOMO ... I could have built more...
24. I can do another side project ... while on holidays 🫤
26. PBS - https://www.youtube.com/watch?v=5p426fSlYH4
27. the Value of AI
28. neos/openapi OpenAPI Server neos/schematic simple types (arrays) <=> objects neos/jsonschema a class can declare its JSON schema and validate incoming data
29. final class Mapper { private readonly Coercer $coercer; private readonly Instantiator $instantiator; very generic names fl public function __construct( con ated instantiation Coercer|null $coercer = null, and runtime Instantiator|null $instantiator = null) { $this->coercer = $coercer ?? new Coercer(); $this->instantiator = $instantiator ?? new Instantiator(); }
30. public function map(Schema $schema, mixed $input): CoercionResult { $coerced = $this->coercer->coerce($schema, $input); if (!$coerced->success) { Result Object return $coerced; } try { Exception as $instance = $this->instantiator->instantiate($schema, Return Type $coerced->value()); } catch (InvalidValue $exception) { return CoercionResult::failure(Issues::create(Issue::create( $exception->path, InvalidValue::ISSUE_CODE, $exception>getMessage()))); unpacking and re-packing results } return CoercionResult::success($instance); }
31. /** * A discriminated union is determinate: the discriminator names exactly one candidate, so descend into that * one rather than trying every branch. An unresolvable discriminator is passed through untouched, so the * Validator reports it precisely instead of this method guessing. * * The discriminator key stays in the value throughout — each candidate declares it as a `const` property, so * it validates, survives projection, and later tells the Instantiator which candidate to build. */ 😵💫
32. Architecture Foto von Sasha Matic auf Unsplash
33. good vs bad architecture
34. e ort per feature overall complexity full reliance on AI little architecture (no AI) little architecture (AI) complexity cli (AI) complexity cli (no AI) ff ff ff time
35. Foto von Erik Mclean auf Unsplash
37. e ort per feature overall complexity code complexity = 😞 data complexity = 😵💫 how do we migrate the legacy data? ff time
38. e ort per feature overall complexity full reliance on AI little architecture (no AI) little architecture (AI) complexity cli (AI) complexity cli (no AI) good architecture ff ff ff time
39. How do we end up with good architecture? Stay in control. Foto von Brooke Balentine auf Unsplash
40. without AI coding with AI coding (AI) quality (human) Re-invest some of the saved time into quality!
41. Develop Test Review
42. Code Review becomes part of the Inner Loop Develop Everybody needs to learn Code Reviews Test Review Everybody is a Code Reviewer
43. Interface (cost: less is better) Functionality (bene t: more is better) fi Prefer Deep Modules over Shallow Modules
44. reduce mutable state think hard about naming think hard about structure
45. AI replicates existing code style. good code rather good code bad code chaos
46. Psychology Foto von Bret Kavanaugh auf Unsplash
48. Illustrations by Lean Six Sigma Global https://www.facebook.com/photo/?fbid=1311775524300657&set=a.666271258851090
49. Develop by thinking slower faster better fi AI = Arti cial Actual Intelligence