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Get Started Free →Comprehensive backend development skill for building scalable backend systems using NodeJS, Express, Go, Python, Postgres, GraphQL, REST APIs. Includes API scaffolding, database optimization, security implementation, and performance tuning. Use when designing APIs, optimizing database queries, implementing business logic, handling authentication/authorization, or reviewing backend code.
.claude/skills/davila7-senior-backend/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-02 | ✗→✓ | ▲ Improved | 189% | 0% |
| case-03 | ✗→✓ | ▲ Improved | 124% | 0% |
| case-04 | ✗→✓ | ▲ Improved | -30% | 0% |
| case-05 | ✗→✓ | ▲ Improved | -26% | 0% |
| case-06 | ✗→✓ | ▲ Improved | 335% | 0% |
Complete toolkit for senior backend with modern tools and best practices.
This skill provides three core capabilities through automated scripts:
bash# Script 1: Api Scaffolder python scripts/api_scaffolder.py [options] # Script 2: Database Migration Tool python scripts/database_migration_tool.py [options] # Script 3: Api Load Tester python scripts/api_load_tester.py [options]
Automated tool for api scaffolder tasks.
Features:
Usage:
bashpython scripts/api_scaffolder.py <project-path> [options]
Comprehensive analysis and optimization tool.
Features:
Usage:
bashpython scripts/database_migration_tool.py <target-path> [--verbose]
Advanced tooling for specialized tasks.
Features:
Usage:
bashpython scripts/api_load_tester.py [arguments] [options]
Comprehensive guide available in references/api_design_patterns.md:
Complete workflow documentation in references/database_optimization_guide.md:
Technical reference guide in references/backend_security_practices.md:
Languages: TypeScript, JavaScript, Python, Go, Swift, Kotlin Frontend: React, Next.js, React Native, Flutter Backend: Node.js, Express, GraphQL, REST APIs Database: PostgreSQL, Prisma, NeonDB, Supabase DevOps: Docker, Kubernetes, Terraform, GitHub Actions, CircleCI Cloud: AWS, GCP, Azure
bash# Install dependencies npm install # or pip install -r requirements.txt # Configure environment cp .env.example .env
bash# Use the analyzer script python scripts/database_migration_tool.py . # Review recommendations # Apply fixes
Follow the patterns and practices documented in:
references/api_design_patterns.mdreferences/database_optimization_guide.mdreferences/backend_security_practices.mdbash# Development npm run dev npm run build npm run test npm run lint # Analysis python scripts/database_migration_tool.py . python scripts/api_load_tester.py --analyze # Deployment docker build -t app:latest . docker-compose up -d kubectl apply -f k8s/
Check the comprehensive troubleshooting section in references/backend_security_practices.md.
references/api_design_patterns.mdreferences/database_optimization_guide.mdreferences/backend_security_practices.mdscripts/ directory| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-01 | fail→fail | 6,296 | 7,828 | +24% | 1 | 1 | 0% | 1,085 | 1,211 | +12% | 0 | 0 | — |
case-02 | fail→pass | 7,828 | 17,296 | +121% | 1 | 1 | 0% | 1,261 | 3,646 | +189% | 0 | 0 | — |
case-03 | fail→pass | 9,084 | 19,795 | +118% | 1 | 1 | 0% | 1,713 | 3,836 | +124% | 0 | 0 | — |
case-04 | fail→pass | 9,897 | 3,381 | -66% | 1 | 1 | 0% | 1,953 | 1,375 | -30% | 0 | 0 | — |
case-05 | fail→pass | 9,615 | 2,382 | -75% | 1 | 1 | 0% | 1,855 | 1,381 | -26% | 0 | 0 | — |
case-06 | fail→pass | 2,127 | 2,311 | +9% | 1 | 1 | 0% | 305 | 1,326 | +335% | 0 | 0 | — |
case-07 | fail→pass | 4,931 | 2,852 | -42% | 1 | 1 | 0% | 888 | 1,310 | +48% | 0 | 0 | — |
case-08 | fail→pass | 4,858 | 2,596 | -47% | 1 | 1 | 0% | 855 | 1,328 | +55% | 0 | 0 | — |
case-09 | fail→pass | 7,201 | 2,041 | -72% | 1 | 1 | 0% | 1,377 | 1,344 | -2% | 0 | 0 | — |
case-10 | fail→pass | 9,754 | 2,537 | -74% | 1 | 1 | 0% | 1,636 | 1,436 | -12% | 0 | 0 | — |
case-11 | fail→pass | 10,504 | 4,279 | -59% | 1 | 1 | 0% | 1,872 | 1,774 | -5% | 0 | 0 | — |
case-12 | fail→pass | 2,651 | 3,025 | +14% | 1 | 1 | 0% | 420 | 1,468 | +250% | 0 | 0 | — |
case-13 | fail→pass | 2,138 | 2,446 | +14% | 1 | 1 | 0% | 322 | 1,450 | +350% | 0 | 0 | — |
case-14 | fail→pass | 2,484 | 1,628 | -34% | 1 | 1 | 0% | 332 | 1,242 | +274% | 0 | 0 | — |
case-15 | pass→pass | 4,501 | 1,690 | -62% | 1 | 1 | 0% | 788 | 1,239 | +57% | 0 | 0 | — |
case-16 | fail→pass | 8,684 | 1,569 | -82% | 1 | 1 | 0% | 1,601 | 1,197 | -25% | 0 | 0 | — |
case-17 | fail→pass | 2,661 | 1,614 | -39% | 1 | 1 | 0% | 483 | 1,189 | +146% | 0 | 0 | — |
case-18 | fail→pass | 4,334 | 1,893 | -56% | 1 | 1 | 0% | 738 | 1,215 | +65% | 0 | 0 | — |
case-19 | pass→pass | 12,464 | 9,908 | -21% | 1 | 1 | 0% | 2,571 | 3,077 | +20% | 0 | 0 | — |
case-20 | pass→pass | 9,904 | 10,389 | +5% | 1 | 1 | 0% | 2,059 | 3,276 | +59% | 0 | 0 | — |
case-21 | pass→pass | 14,558 | 13,769 | -5% | 1 | 1 | 0% | 3,043 | 3,810 | +25% | 0 | 0 | — |
case-22 | pass→pass | 5,712 | 3,380 | -41% | 1 | 1 | 0% | 1,183 | 1,635 | +38% | 0 | 0 | — |
DecimalAI ran this skill against gemini-3.6-flash twice over the same eval suite — once with the skill loaded and once without — and compared the two runs case by case. 22 cases were attempted, and 21 counted toward the lift figure. The other 1 produced results that are not comparable between the two arms, so they are excluded from the headline rather than averaged into it. The headline lift of +73 percentage points is the difference between those two pass rates over the 21 comparable cases.
Without the skill loaded, the model failed this case. With it loaded, the same prompt on the same model passed. This is one improved case from the latest verified run; every case, including any that regressed, is in the table above.
Other measured skills in the registry, with their headline benchmark lift.