008-ADR: Tech Stack¶
Architectural Decision Records (ADR) on defining a Tech Stack for Software Development.
1. State¶
- Author(s): Sentenz
- Date: 2026-04-30
- Status: Proposed
2. Context¶
In software development, selecting a tech stack involves choosing a specific set of technologies such as programming languages, frameworks, databases, front-end and back-end tools, and other essential software to develop and maintain an application. The decision of whether or not to define a tech stack impacts several aspects of a project, including scalability, maintainability, onboarding, and operational efficiency.
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Decision Drivers
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Consistency
Can a uniform set of technologies be enforced across all projects and services?
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Maintainability
How easy is it to maintain, update, and evolve the codebase when technology choices are standardized?
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Onboarding
How quickly can new team members become productive when the technology landscape is well-defined?
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Collaboration
Does a shared toolchain facilitate cross-team contribution and code review?
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Scalability
Do the chosen technologies support the growth of the application and team over time?
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Operational Efficiency
Does focusing expertise on a defined set of tools reduce context-switching and accelerate delivery?
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3. Decision¶
Note
Periodically review the selected tech stack to incorporate beneficial new technologies and emerging industry trends when appropriate. In addition, limited flexibility will be introduced by allowing experimentation with new technologies in controlled environments, such as feature-specific services.
3.1. Tech Stack¶
The projects will standardize on a defined tech stack. This approach ensures that all projects use a consistent, well-understood set of technologies that best meet current and foreseeable future needs.
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Rationale
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Consistency
A defined tech stack enforces uniform technology choices across all services and projects, reducing fragmentation and making the codebase easier to read and maintain.
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Maintainability
Teams become familiar with a fixed set of technologies, reducing cognitive overhead and making maintenance, refactoring, and upgrades more predictable.
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Onboarding
New team members only need to learn the defined stack, significantly reducing the time to productivity and lowering the barrier to contribution.
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Collaboration
Shared tooling and languages remove barriers to cross-team contribution, simplify code reviews, and foster a culture of collective ownership.
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Scalability
Predictable technologies facilitate architectural planning, making it easier to anticipate scaling requirements and adopt infrastructure tooling that supports growth.
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Operational Efficiency
Focused expertise on selected tools reduces context-switching, accelerates delivery, and enables teams to invest in deeper tooling knowledge.
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4. Considered¶
4.1. No Definition¶
Allowing developers to use any technology that best fits, with no formalized set of tools.
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Pros
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Flexibility
Allows developers to choose the most suitable tools for specific problems, potentially leading to innovative solutions.
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Adoption of New Technologies
Easier to integrate the latest technologies as they emerge.
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Developer Autonomy
Can increase job satisfaction by giving developers more control over their work.
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Cons
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Inconsistency
Leads to a fragmented codebase, making maintenance and knowledge transfer challenging.
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Steeper Learning Curve
Team members may need to familiarize themselves with multiple technologies to contribute effectively.
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Collaboration Challenges
Hinders teamwork due to varying tools and practices.
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Integration Issues
Different technologies may not seamlessly integrate, leading to technical debt.
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Onboarding
New team members may struggle to adapt to a heterogeneous technical environment.
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4.2. Tech Stack¶
Defining the technologies to be used throughout the project.
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Pros
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Consistency
Ensures a uniform codebase, making it easier to read, understand, and maintain.
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Efficiency
Developers become proficient with selected technologies, leading to faster development over time.
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Collaboration
Facilitates better teamwork as everyone uses the same tools and languages.
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Onboarding
Simplifies the onboarding process for new team members who only need to learn the defined stack.
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Scalability
Predictable technologies make it easier to plan for application scaling.
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Cons
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Inflexibility
Limits the ability to incorporate new or specialized technologies that may be better suited for certain tasks.
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Obsolescence Risk
The chosen technologies may become outdated, requiring future migrations.
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Initial Time Investment
Requires time and resources upfront to select the appropriate technologies.
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5. Consequences¶
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Positive
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Consistency
A uniform codebase across all projects reduces maintenance burden and simplifies cross-team contributions.
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Onboarding
New team members ramp up faster by focusing on a single, well-documented set of technologies.
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Operational Efficiency
Reduced context-switching and deeper tooling expertise accelerate delivery and improve quality.
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Collaboration
Shared technology choices remove barriers between teams and support a culture of collective ownership.
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Negative
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Inflexibility
Teams may be prevented from adopting better-suited tools for specific use cases without a formal review process.
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Obsolescence Risk
The defined stack may become outdated over time, requiring coordinated migration efforts across all projects.
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Initial Investment
Defining, communicating, and enforcing the tech stack requires upfront time and organizational alignment.
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6. Implementation¶
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Document the Tech Stack
Record the defined tech stack in the repository tech stack article, listing selected technologies by category with brief descriptions.
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Communicate to Team Members
Share the defined tech stack with all team members through onboarding documentation and internal announcements to ensure awareness and alignment.
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Update Project Templates
Revise project scaffolding tools and starter templates to default to the defined tech stack, reducing friction when starting new projects.
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Establish a Review Cadence
Schedule periodic reviews (e.g., annually) to evaluate the tech stack against emerging technologies and evolving project requirements.
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Define an Exception Process
Create a governed process for requesting exceptions or experimenting with technologies outside the defined stack in isolated, controlled environments.
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Validate Conformance
Verify adherence to the defined tech stack through code review criteria and CI/CD pipeline checks where applicable.
7. References¶
- Sentenz Tech Stack article.