Code reviews often serve as a checkpoint for catching bugs, ensuring code quality, and maintaining consistency. However, they can also become powerful moments for architectural learning. By intentionally shifting the focus to architecture during code reviews, teams can learn from each other’s design decisions, avoid common architectural pitfalls, and evolve the system in a more intentional and coherent way. Here’s how you can turn code reviews into valuable architectural learning opportunities.
1. Encourage Design Discussions in Code Reviews
Many code reviews focus on individual lines or methods, with little attention to the architectural context. To change this, encourage reviewers to ask questions like:
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How does this code align with the overall system architecture?
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Are there any design patterns or principles being violated or reinforced here?
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Does this implementation scale in the way we anticipate, or will it become a bottleneck later?
By framing code reviews around design and architecture, you encourage team members to think critically about the long-term impact of their changes. It’s not just about whether the code works today, but whether it fits into the broader system vision.
2. Highlight Architectural Patterns and Anti-Patterns
During code reviews, make it a point to recognize architectural patterns that are present in the code. Whether it’s a clean separation of concerns, the use of microservices, or a well-structured event-driven approach, pointing these out can reinforce good design. Similarly, if the code introduces an anti-pattern (like tight coupling or monolithic structures), this is a learning moment for everyone involved.
Reviewers should be able to identify and articulate why a particular choice fits or contradicts established patterns. This gives everyone the chance to improve their understanding of architecture, not just at a theoretical level but in terms of real-world applications.
3. Review Code Through the Lens of Non-Functional Requirements
Architectural decisions often impact non-functional requirements like performance, scalability, maintainability, and security. Code reviews are an opportunity to evaluate how well the implementation supports these attributes. For example:
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Scalability: Does the code scale well as the system grows? Could a database query or API call become a bottleneck?
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Maintainability: Is the code modular, easy to test, and well-documented? Can other team members easily modify it?
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Security: Does the code implement necessary security measures, like input validation and encryption?
This practice encourages developers to think about code in a holistic way, considering both functionality and the quality attributes that define a robust system.
4. Incorporate Architectural Documentation into Code Reviews
Ensure that architectural decisions are reflected in the system’s documentation, and encourage developers to reference this documentation during their reviews. This could include:
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Diagrams of the system architecture
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API documentation
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A style guide for common architectural patterns used in the codebase
By integrating these resources into the code review process, developers will better understand why certain design decisions were made and how their own code fits into the larger picture. This also makes it easier to identify any architectural drift or discrepancies that may arise over time.
5. Promote Cross-Disciplinary Learning
Sometimes, developers may not have a deep understanding of architecture, and conversely, architects may not be fully aware of the intricacies of daily coding tasks. Code reviews can serve as a bridge for cross-disciplinary learning. Architects should make an effort to join code reviews or mentor developers on how to approach architecture from a practical perspective, and developers should share their insights on how architecture decisions impact day-to-day development tasks.
This cross-pollination of knowledge helps create a culture where both coding and architectural skills are continuously honed.
6. Focus on Incremental Architectural Improvements
Architecture isn’t just a monolithic decision made at the beginning of a project—it’s an ongoing process that evolves. Code reviews are an ideal place to discuss incremental architectural improvements. When reviewing code, ask questions such as:
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How does this change evolve the architecture in a positive direction?
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What lessons can we learn from this change that we can apply to future architectural decisions?
If a piece of code introduces a new architectural element or addresses a design flaw, highlight that improvement. Even small, incremental shifts can lead to a more coherent and adaptable system over time.
7. Use Code Reviews as Opportunities for Pair Learning
Pairing up senior architects with junior developers during code reviews can help mentor them in the architectural aspects of coding. A senior architect can walk through their reasoning behind certain design decisions, share knowledge on trade-offs, and explain how the code fits into the system’s broader goals. Junior developers, on the other hand, can bring fresh perspectives and point out areas where the architecture may be unnecessarily complex or hard to understand.
This dynamic makes the code review process a more valuable learning experience for everyone involved.
8. Create an Environment for Constructive Feedback
Architectural feedback can sometimes feel daunting, especially if it challenges established practices or introduces significant change. It’s important to cultivate a culture where feedback is constructive, and where team members are encouraged to express differing views openly. As architectural discussions often involve trade-offs, make sure that there’s room for healthy debate about the merits and drawbacks of different approaches.
This openness to critique helps everyone improve, both in their coding practices and in their understanding of architecture.
9. Provide Actionable Insights, Not Just Criticism
When reviewing code, it’s easy to focus on pointing out flaws or mistakes. However, to make the review an architectural learning moment, focus on providing actionable insights. If a code decision doesn’t align with architectural goals, offer specific guidance on how to improve it:
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Instead of saying, “This design doesn’t work,” say, “I’d recommend using a more modular approach here to improve scalability.”
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Rather than, “This doesn’t follow the pattern,” suggest, “This could be refactored into a service-oriented architecture to improve maintainability.”
This shift from criticism to actionable advice ensures that developers leave the review with a clear understanding of how to improve both their code and their architectural thinking.
10. Capture and Share Architectural Learning Moments
Over time, your team will accumulate a rich set of architectural lessons learned from code reviews. Make it a point to document these learning moments—whether it’s through a knowledge-sharing session, a wiki page, or a shared Slack channel. By capturing these insights, you create a reference for future code reviews and help team members avoid common pitfalls.
You could even turn these lessons into a team-wide retrospective or discussion, fostering a culture of continuous learning.
Conclusion
Code reviews don’t have to be limited to nit-picking syntax or catching bugs—they can be a powerful tool for architectural growth and learning. By shifting the focus of reviews to include architectural considerations, encouraging deep discussions around design decisions, and creating an environment of continuous learning, teams can foster a culture where architecture becomes a shared responsibility. As developers build their architectural knowledge, they’ll not only become better at coding but also more adept at designing scalable, maintainable, and robust systems.