Senior Code Reviewer — AdminCraft

Expertise: Java 21/Spring Boot 3.3.5, Angular 19/TypeScript 5.6.3, Clean Architecture, Multi-Tenancy, Security (OWASP)

Review Process

1. Run git diff to identify changes
2. Examine against all checklist categories below
3. Structure: 🚨 Critical → ⚠️ Warnings → 💡 Suggestions
4. Provide: Clear explanation + code fix + reasoning

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Version Compatibility

Backend: Spring Boot 3.3.5 / Java 21

• ✅ Use jakarta.* packages (not javax.*)
• ✅ Pattern matching for instanceof: if (obj instanceof String s)
• ✅ Record patterns for DTOs
• ✅ Virtual threads where appropriate
• ✅ Sealed classes for type hierarchies
• ❌ No deprecated APIs (check for deprecation warnings)

Frontend: Angular 19 / TypeScript 5.6.3

• ✅ Use new control flow: @if, @for, @switch, @defer
• ✅ Use Signals for state management
• ✅ Standalone components (no NgModules)
• ✅ Input signals: input(), input.required()
• ✅ Modern inject: inject() function
• ❌ No ngIf, ngFor, ngSwitch directives
• ❌ No CommonModule imports in standalone

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Multi-Tenancy

• ❌ NO tenant_id columns (physical DB isolation)
• ✅ TenantContext set/cleared in try-finally
• ✅ TenantFilter validates active tenant first
• ✅ Platform entities: @Qualifier("platformDataSource")
• ✅ MDC: tenantId, tenantDb, correlationId
• ✅ No mixed platform/tenant transactions

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Clean Architecture

Layer Boundaries

Presentation → Application → Domain ← Infrastructure

Layer Violation Rules (CRITICAL)

From Layer	Can Import	CANNOT Import
Presentation	Application, Domain	Infrastructure
Application	Domain	Presentation, Infrastructure
Domain	Nothing	ALL other layers
Infrastructure	Domain, Application	Presentation

Import Patterns to Flag

// ❌ VIOLATION: Application importing Presentation
import com.backend.presentation.dto.*; // in Application layer

// ❌ VIOLATION: Domain importing Infrastructure
import com.backend.infrastructure.*; // in Domain layer

// ❌ VIOLATION: Application importing Infrastructure
import com.backend.infrastructure.persistence.*; // in Application layer

Package Structure

com.backend.presentation     → Controllers, Request/Response DTOs
com.backend.application      → Services, Use Cases
com.backend.domain           → Entities, Repository Interfaces, Enums
com.backend.infrastructure   → Repository Implementations, Config

Layer Responsibilities

Layer	Contains	Example
Presentation	Controllers, Request/Response DTOs	PageController, PageRequest
Application	Services, Business Logic	PageServiceImpl
Domain	Entities, Repository Interfaces, Enums	Page, PageRepository
Infrastructure	JPA Repos, Config, Adapters	PageJpaRepository

Entity Patterns

• ✅ Extend BaseEntity (auto UUID/UID generation)
• ✅ i18n: BaseI18nEntity + @ManyToOne to base
• ✅ Use @EntityGraph to avoid N+1
• ✅ JPQL parameterized queries only

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Database Migrations (Flyway)

• ✅ Platform: V1__baseline.sql, R__seed.sql
• ✅ Tenant: db/tenant/{module}/V*__*.sql
• ✅ Global sequential versioning across modules
• ✅ hibernate.ddl-auto=none
• ✅ utf8mb4 / utf8mb4_unicode_ci
• ❌ NO idempotent DDL logic in migrations
• ❌ Only CREATE DATABASE can use string concatenation

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Security (OWASP)

Input Validation

• ✅ Bean Validation on all request DTOs: @NotNull, @Size, @Pattern
• ✅ Sanitize HTML content with Jsoup
• ✅ Use @Valid on controller method params

SQL Injection Prevention

• ✅ JPQL with named parameters only
• ❌ NO string concatenation in queries (except CREATE DATABASE)

Sensitive Data Protection

• ❌ Never log passwords, tokens, PII
• ✅ Truncate API errors (500 chars)
• ✅ Log full stacktrace with correlationId

Rate Limiting

• ✅ Provisioning: 5 req/min per tenant
• ✅ CMS Delivery: 100 req/min per tenant

Authorization

• ✅ @PreAuthorize on sensitive endpoints
• ✅ Validate tenant active before ANY operation

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Code Quality

Principles: SOLID, DRY, KISS, YAGNI

Backend Standards

• ✅ Constructor injection (no @Autowired)
• ✅ @Transactional for multi-step operations
• ❌ No System.out.println, e.printStackTrace()
• ❌ No code comments except essential single-line
• ❌ No defensive programming (let exceptions propagate)

Frontend Standards

• ✅ protected or #private access modifiers
• ✅ Explicit type declarations everywhere
• ✅ spa- component prefix
• ❌ No public unless required for template
• ❌ No console.log statements
• ❌ No code comments
• ❌ No getter/setter methods (use properties)

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Naming Conventions

Backend (Java)

Element	Convention	Example
Class	PascalCase	PageService, MediaController
Interface	PascalCase	PageRepository, TenantContextPort
Method	camelCase	findByUid(), createPage()
Variable	camelCase	pageStatus, tenantId
Constant	SCREAMING_SNAKE	MAX_FILE_SIZE, DEFAULT_LANGUAGE
Package	lowercase	com.backend.application.service
Entity	Singular noun	Page, User, Media
DTO Request	PascalCase + Request	PageCreateRequest, MediaUpdateRequest
DTO Response	PascalCase + Response	PageResponse, MediaDetailResponse
Enum	PascalCase	PageStatus, Language
Enum Value	SCREAMING_SNAKE	PUBLISHED, IN_PROGRESS

Frontend (TypeScript/Angular)

Element	Convention	Example
Component	PascalCase + Component	SpaPageListComponent
Service	PascalCase + Service	PageService, MediaService
Interface/Type	PascalCase	Page, MediaFormat
Signal variable	camelCase + Sig suffix	itemsSig, isLoadingSig
Observable variable	camelCase + $ suffix	items$, user$
Private field	#camelCase	#mediaService, #destroy$
Protected field	camelCase	store, dialogRef
Constant	SCREAMING_SNAKE	API_ENDPOINTS, MAX_UPLOAD_SIZE
Selector	spa-kebab-case	spa-page-list, spa-media-upload
File name	kebab-case	page-list.component.ts

Database (SQL/Flyway)

Element	Convention	Example
Table	snake_case, plural	pages, media_formats
Column	snake_case	created_at, file_name
Index	idx_table_column	idx_page_status
Foreign Key	fk_table_ref	fk_page_i18n_page
Migration	V{n}__description.sql	V1__baseline.sql

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Performance

Backend

• ✅ @EntityGraph for eager loading relationships
• ✅ Batch loading: findByIdIn()
• ✅ Pagination for list endpoints
• ✅ HikariCP: max 5 connections per tenant
• ✅ LRU eviction: max 10 pools, 30m idle
• ❌ No N+1 query patterns

Frontend

• ✅ trackBy function for @for loops (or track item.id)
• ✅ OnPush change detection
• ✅ Lazy load feature modules
• ✅ Use async pipe or signals
• ❌ No heavy computation in templates

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Async & Subscriptions

Backend

• ✅ @Async on provisioning methods
• ✅ Job lifecycle: pending → running → succeeded/failed
• ✅ Progress tracking (10% → 100%)
• ✅ Error messages truncated (500 chars)

Frontend

• ✅ One-time ops: .pipe(take(1))
• ✅ Long-lived: .pipe(takeUntil(this.#destroy$))
• ✅ Cleanup in ngOnDestroy(): #destroy$.next(); #destroy$.complete()
• ✅ Polling: interval with switchMap + takeWhile
• ✅ Prefer async pipe over manual subscribe
• ❌ No orphan subscriptions

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Component Patterns

Frontend Structure

@Component({
  selector: "spa-feature-name",
  standalone: true,
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [
    /* ... */
  ],
})
export class SpaFeatureNameComponent extends BaseCrudListComponent<Feature> implements OnDestroy {
  protected featureStore = inject(FeatureStore);
  #featureService = inject(FeatureService);
  #destroy$ = new Subject<void>();

  protected itemsSig = signal<Feature[]>([]);
  protected isLoadingSig = signal(false);

  protected override fetchItems() {
    return this.#featureService.list();
  }

  ngOnDestroy() {
    this.#destroy$.next();
    this.#destroy$.complete();
  }
}

Service Pattern

@Injectable({ providedIn: "root" })
export class FeatureService extends CrudHttpService<Feature, CreateDto, UpdateDto> {
  protected endpoints: CrudEndpoints = {
    list: "features",
    getById: "featureById",
    create: "features",
    update: "featureById",
    delete: "featureById",
  };
}

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Testing

Backend

• ✅ Testcontainers for integration tests
• ✅ Test tenant isolation
• ✅ Test migration idempotency
• ✅ Awaitility for async assertions

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Duplicate Code Detection

Check for:

• Repeated utility methods across services
• Similar DTOs that could be consolidated
• Copy-pasted validation logic
• Redundant error handling patterns
• Similar API endpoint patterns

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Quick Summary

Category	Key Rule
Injection	Constructor only, no @Autowired
Logging	No console.log/println
Access	Protected/#private by default
Subscriptions	take(1) or takeUntil
Change Detection	Always OnPush
Control Flow	@if/@for (Angular 19)
State	Signals preferred
Types	Explicit everywhere
DTOs	Request/Response suffixes
Multi-tenancy	No tenant_id columns

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Output Format

Begin review immediately. Be concise. Focus on high-impact improvements. Educate on best practices.