backend-development-feature-development

Orchestrate end-to-end feature development from requirements to production deployment:

[Extended thinking: This workflow orchestrates specialized agents through comprehensive feature development phases - from discovery and planning through implementation, testing, and deployment. Each phase builds on previous outputs, ensuring coherent feature delivery. The workflow supports multiple development methodologies (traditional, TDD/BDD, DDD), feature complexity levels, and modern deployment strategies including feature flags, gradual rollouts, and observability-first development. Agents receive detailed context from previous phases to maintain consistency and quality throughout the development lifecycle.]

Use this skill when

• Coordinating end-to-end feature delivery across backend, frontend, and data
• Managing requirements, architecture, implementation, testing, and rollout
• Planning multi-service changes with deployment and monitoring needs
• Aligning teams on scope, risks, and success metrics

Do not use this skill when

• The task is a small, isolated backend change or bug fix
• You only need a single specialist task, not a full workflow
• There is no deployment or cross-team coordination involved

Instructions

1. Confirm feature scope, success metrics, and constraints.
2. Select a methodology and define phase outputs.
3. Orchestrate implementation, testing, and security validation.
4. Prepare rollout, monitoring, and documentation plans.

Safety

• Avoid production changes without approvals and rollback plans.
• Validate data migrations and feature flags in staging first.

Configuration Options

Development Methodology

• traditional: Sequential development with testing after implementation
• tdd: Test-Driven Development with red-green-refactor cycles
• bdd: Behavior-Driven Development with scenario-based testing
• ddd: Domain-Driven Design with bounded contexts and aggregates

Feature Complexity

• simple: Single service, minimal integration (1-2 days)
• medium: Multiple services, moderate integration (3-5 days)
• complex: Cross-domain, extensive integration (1-2 weeks)
• epic: Major architectural changes, multiple teams (2+ weeks)

Deployment Strategy

• direct: Immediate rollout to all users
• canary: Gradual rollout starting with 5% of traffic
• feature-flag: Controlled activation via feature toggles
• blue-green: Zero-downtime deployment with instant rollback
• a-b-test: Split traffic for experimentation and metrics

Phase 1: Discovery & Requirements Planning

1. Business Analysis & Requirements

   • Use Task tool with subagent_type="business-analytics::business-analyst"
   • Prompt: "Analyze feature requirements for: $ARGUMENTS. Define user stories, acceptance criteria, success metrics, and business value. Identify stakeholders, dependencies, and risks. Create feature specification document with clear scope boundaries."
   • Expected output: Requirements document with user stories, success metrics, risk assessment
   • Context: Initial feature request and business context

2. Technical Architecture Design

   • Use Task tool with subagent_type="comprehensive-review::architect-review"
   • Prompt: "Design technical architecture for feature: $ARGUMENTS. Using requirements: [include business analysis from step 1]. Define service boundaries, API contracts, data models, integration points, and technology stack. Consider scalability, performance, and security requirements."
   • Expected output: Technical design document with architecture diagrams, API specifications, data models
   • Context: Business requirements, existing system architecture

3. Feasibility & Risk Assessment

   • Use Task tool with subagent_type="security-scanning::security-auditor"
   • Prompt: "Assess security implications and risks for feature: $ARGUMENTS. Review architecture: [include technical design from step 2]. Identify security requirements, compliance needs, data privacy concerns, and potential vulnerabilities."
   • Expected output: Security assessment with risk matrix, compliance checklist, mitigation strategies
   • Context: Technical design, regulatory requirements

Phase 2: Implementation & Development

1. Backend Services Implementation

   • Use Task tool with subagent_type="backend-architect"
   • Prompt: "Implement backend services for: $ARGUMENTS. Follow technical design: [include architecture from step 2]. Build RESTful/GraphQL APIs, implement business logic, integrate with data layer, add resilience patterns (circuit breakers, retries), implement caching strategies. Include feature flags for gradual rollout."
   • Expected output: Backend services with APIs, business logic, database integration, feature flags
   • Context: Technical design, API contracts, data models

2. Frontend Implementation

   • Use Task tool with subagent_type="frontend-mobile-development::frontend-developer"
   • Prompt: "Build fronten