Patrick Collison: Programming paradigms have stagnated for two decades, thoughtful API design drives business success, and migrating core abstractions poses unique challenges | AI + a16z

Stripe's enduring use of early tech choices highlights the lasting impact of thoughtful software design.

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Add us on Google by Editorial Team Apr. 10, 2026

Key takeaways

• Programming paradigms have remained largely unchanged over the past two decades, suggesting a potential area for innovation.
• Thoughtful API and abstraction design can significantly impact business success, highlighting their importance in software development.
• Migrating core abstractions in software is more complex than launching new products due to the need for compatibility with existing systems.
• Smalltalk’s development environment offers real-time code editing and debugging, enhancing the feedback loop for developers.
• Early AI models, like those trained on MSN Messenger conversations, used simple Bayesian predictors, demonstrating the evolution of AI technology.
• The AI bot engaged users in lengthy conversations despite not passing the Turing test, showing varying levels of AI conversational success.
• The separation between runtime and text editing in development environments is seen as a mistake, advocating for more integrated development tools.
• Visual representations in programming may not be universally applicable, emphasizing the need for context-specific tools.
• AI is expected to play a background role in programming, enabling faster iteration and greater control for developers.
• Future AI interactions may evolve beyond traditional programming paradigms, indicating a shift in technology use.
• The integration of AI in software development is predicted to enhance efficiency and control, benefiting programmers.
• The evolution of AI and programming paradigms suggests a future with more advanced compiler or interpreter technology.

Guest intro

Patrick Collison is CEO and co-founder of Stripe. He discusses Stripe’s early technical choices, including its use of MongoDB and Ruby that persist 15 years later, as well as his history with Smalltalk and Lisp. Collison is also an investor in Anysphere.

The stagnation in programming paradigms

• It’s interesting to me that we haven’t experimented in some sense that much with the paradigm of programming over the past twenty years

  — Patrick Collison

• Programming paradigms have not significantly evolved, indicating a potential area for future innovation.
• The lack of experimentation in programming paradigms over the past two decades suggests room for growth.
• Understanding the historical context of programming languages can inform future developments in software engineering.
• The stagnation in programming paradigms may impact the evolution of software development practices.
• The need for innovation in programming paradigms is highlighted by the lack of significant changes over twenty years.
• This stagnation reflects a critical viewpoint on the current state of software engineering.
• Future developments in programming paradigms could influence the direction of software engineering.

The impact of API and abstraction design

• The right API design, the right abstraction design ended up having just quite significant business ramifications

  — Patrick Collison

• Thoughtful API and abstraction design are crucial for driving business success.
• The design of APIs can significantly impact software development and business operations.
• Understanding API and abstraction design is essential for developers and companies.
• The business ramifications of API design highlight its importance in software engineering.
• Effective API and abstraction design can lead to significant business advantages.
• The role of API design in business success underscores its importance in development strategies.
• Companies should prioritize API and abstraction design to enhance their business outcomes.

Challenges in migrating core abstractions

• Making them work alongside everything already built on the old ones is more like an instruction set migration than a product launch

  — Patrick Collison

• Migrating core abstractions is more complex than launching new products.
• The integration of new systems with legacy code presents significant challenges in software development.
• Understanding the complexities of migrating core abstractions is crucial for developers.
• The technical difficulties of maintaining compatibility with existing systems are highlighted.
• Migrating core abstractions requires careful planning and execution to ensure success.
• The challenges of integrating new systems with legacy code can impact software development timelines.
• Developers must navigate the complexities of core abstraction migration to achieve successful software integration.

Advantages of Smalltalk’s development environment

• Smalltalk is actually this extremely interesting development environment that had a lot of the aspects of Lisp that I’d really appreciated

  — Patrick Collison

• Smalltalk allows for real-time code editing and debugging, improving the feedback loop for developers.
• The development environment of Smalltalk offers unique advantages for programming efficiency.
• Real-time code editing in Smalltalk enhances the development process for programmers.
• Smalltalk’s environment provides a more interactive and efficient development experience.
• The ability to edit code in real-time can significantly improve programming productivity.
• Smalltalk’s development environment is appreciated for its efficiency and interactivity.
• Developers can benefit from the real-time feedback loop offered by Smalltalk’s environment.

Early AI models and their limitations

• It was a really simple Bayesian next word predictor

  — Patrick Collison

• Early AI models used simple Bayesian predictors, highlighting the evolution of AI technology.
• The AI bot trained on MSN Messenger conversations demonstrates foundational AI techniques.
• Understanding the limitations of early AI models can inform future AI development.
• The simplicity of early AI technology contrasts with the sophistication of modern AI models.
• Early AI projects relied on basic techniques, reflecting the technology’s evolution.
• The use of MSN Messenger conversations as training data highlights the context of early AI models.
• The evolution of AI technology is evident in the progression from simple Bayesian predictors to advanced models.

AI conversational success and the Turing test

• It never really passed the Turing test

  — Patrick Collison

• The AI bot engaged users in lengthy conversations despite not passing the Turing test.
• AI conversational success can vary, as demonstrated by the bot’s interactions with users.
• The challenges of achieving human-like conversation in AI are highlighted by the Turing test.
• The AI bot’s ability to engage users reflects varying standards of success in AI interactions.
• Understanding the Turing test is essential for evaluating AI conversational abilities.
• The AI bot’s interactions with users demonstrate the complexity of AI conversational success.
• The Turing test serves as a benchmark for assessing AI’s conversational capabilities.

Critique of development environment separation

• I think it’s just such a mistake that we have ended up with development environments where there is such a separation between the runtime and the text editing

  — Patrick Collison

• The separation between runtime and text editing in development environments is criticized.
• Integrated development tools are advocated for, reflecting a need for more cohesive environments.
• The critique highlights the importance of integration in programming tools.
• Developers can benefit from environments that combine runtime and text editing.
• The current state of development environments is seen as a mistake, emphasizing integration.
• Understanding the evolution of programming environments can inform future tool development.
• The need for integrated development environments is underscored by the critique of current practices.

Limitations of visual representations in programming

• I think it’s often very hard to find such useful spatial continuous representations for arbitrary systems

  — Patrick Collison

• Visual representations may not be universally applicable in programming.
• The complexity of different systems can limit the usefulness of visual tools.
• Understanding the limitations of visual representations is crucial for effective programming.
• Context-specific tools are necessary to address the complexity of various systems.
• The applicability of visual tools in programming depends on the system’s complexity.
• Visual representations may not always provide the desired clarity in programming.
• Developers should consider the limitations of visual tools when designing systems.

AI’s role in programming and iteration speed

• We are playing with ideas around letting the AI increasingly take time into the background to run its code

  — Patrick Collison

• AI is expected to take a background role in programming, enhancing iteration speed.
• The integration of AI in software development can improve efficiency and control for developers.
• Faster iteration and greater control are anticipated benefits of AI’s role in programming.
• The shift in AI’s role reflects a focus on efficiency and developer empowerment.
• AI’s background role in programming is predicted to enhance the development process.
• The integration of AI in programming can lead to more efficient software development.
• Developers can benefit from AI’s role in improving iteration speed and control.

Future evolution of AI interaction

• I think there is a future version of the world where the way you interact with AI is a little bit less like… a human helper

  — Patrick Collison

• Future AI interactions may evolve beyond traditional programming paradigms.
• The evolution of AI interaction suggests a shift in technology use and user experience.
• Advanced compiler or interpreter technology may characterize future AI interactions.
• Understanding current AI interaction trends can inform predictions about future developments.
• The shift in AI interaction reflects a move towards more sophisticated technology use.
• Future AI interactions may offer new opportunities for user engagement and technology integration.
• The evolution of AI interaction highlights the potential for innovation in programming paradigms.

Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.