Why Solving Business Problems Is the True Role of Engineers – A Deep Dive into DDD
This article explains that an engineer's primary responsibility is to solve business problems, explores the challenges across a product's lifecycle, outlines software complexity dimensions, and demonstrates how Domain‑Driven Design, strategic and tactical patterns, and modern architectural styles like Hexagonal and CQRS can effectively manage that complexity.
Business Development Responsibilities
Engineers' primary duty is to solve business problems rather than merely write code.
Technical teams must provide stable, reliable support, offer data‑driven insights for decisions, influence business direction, and build capable, well‑structured teams.
Business Lifecycle Challenges
Startup : rapid capability building and fast trial‑and‑error.
Growth : expanding functionality to meet increasing business needs.
Platform : supporting a growing number of business scenarios.
Decline : innovating to extend the product’s lifespan.
Controlling software complexity is crucial for maximizing business value.
Software Complexity Dimensions
Performance – single‑machine and cluster performance.
High Availability – compute and storage reliability.
Scalability.
Low Cost.
Security.
Scale – business and system scale.
DDD Essence
Domain‑Driven Design reduces software complexity by aligning the domain model with business needs, creating clear boundaries and shared language.
DDD offers bounded contexts, strategic patterns, and tactical patterns to manage complexity.
Strategic Patterns
Shared Kernel
Customer/Supplier
Conformist
Anti‑corruption Layer
Separate Way
Open Host Service
Published Language
Tactical Patterns
Entity
Value Object
Domain Service
Factory
Repository
Domain Event
Aggregate and Aggregate Root
Architecture Layers
Comparisons of traditional three‑tier, Hexagonal, Onion, and DDD layered architectures illustrate how to keep the domain model at the core while isolating technical concerns.
CQRS
Command‑Query Responsibility Segregation separates write (command) and read (query) operations, allowing the domain model to stay focused on business logic.
COLA Framework Practices
The article outlines naming conventions, package structures, and extension mechanisms used in Alibaba’s COLA framework to enforce consistent, maintainable codebases.
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