senior-backend
Backend development with Node.js/Express/Fastify and PostgreSQL. Use when designing REST or GraphQL APIs, optimizing database queries, implementing authentication, building microservices, handling migrations, or reviewing backend code.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/borghei/claude-skills --skill senior-backend- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads senior-backend automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Senior Backend Engineer
Scaffold and review backend services: API design and OpenAPI-driven code generation for Express/Fastify/Koa, PostgreSQL schema analysis and migration generation, HTTP load testing, and production security hardening. Outputs ready-to-run route handlers, Zod validators, TypeScript types, migrations with rollbacks, and load-test reports.
Core Capabilities
- API scaffolding — generate route handlers, validation middleware, TypeScript types, and OpenAPI specs across Express, Fastify, and Koa.
- Database optimization — schema analysis, missing-index detection, N+1 risk detection, and migration generation with paired rollback scripts.
- Load testing — configurable concurrency with latency percentiles (P50/P90/P95/P99), throughput, error rates, and endpoint comparison.
- Security hardening — JWT config, rate limiting, input validation (Zod), and security headers (helmet) for production readiness.
- Standardized contracts — consistent
data/error/metaresponse envelope and HTTP status conventions.
When to Use
- Designing a new API or refactoring existing endpoints.
- Slow queries or database performance needs improvement.
- Preparing an API for production or after a security review.
- Building regression/load-test baselines for backend endpoints.
Clarify First
Before scaffolding, confirm these inputs. If any is unknown or vague, ASK — do not assume:
- Framework — Express / Fastify / Koa (
--framework; changes the generated route handlers, validators, and types) - API contract source — the OpenAPI spec or endpoint list to scaffold from (the input the scaffolder reads)
- Database intent — the schema file and whether you want analysis vs migration generation (drives
database_migration_tool.py)
Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.
Tools
| Tool | Purpose | Command |
|---|---|---|
api_scaffolder.py | Generate route handlers, Zod validators, and TS types from an OpenAPI spec | python scripts/api_scaffolder.py openapi.yaml --framework express --output src/routes/ |
database_migration_tool.py | Analyze schemas, suggest indexes, and generate migrations with rollbacks | python scripts/database_migration_tool.py schema.sql --analyze |
api_load_tester.py | HTTP load test with latency percentiles, throughput, and comparison | python scripts/api_load_tester.py https://api.example.com/users --concurrency 50 --duration 30 |
References
Load the reference that matches the task — keep this file lean and pull detail on demand:
- references/tools-reference.md — full usage examples, flag tables, and sample output for the scaffolder, migration tool, and load tester, plus quick-start and common commands. Read when running any tool.
- references/workflows-and-patterns.md — the API-design, database-optimization, and security-hardening workflows, common response/index patterns, the troubleshooting table, and the success-criteria bar. Read when designing or hardening a service.
- references/api_design_patterns.md — REST vs GraphQL, versioning, error handling, pagination. Read when designing new APIs.
- references/database_optimization_guide.md — indexing strategies, query optimization, N+1 solutions. Read when fixing slow queries.
- references/backend_security_practices.md — OWASP Top 10, auth patterns, input validation. Read when hardening security.
Scope & Limitations
What this skill covers:
- REST API design, scaffolding, and OpenAPI-driven code generation for Express, Fastify, and Koa
- PostgreSQL schema analysis, index optimization, migration generation with rollback support
- HTTP load testing with latency percentile analysis, throughput measurement, and endpoint comparison
- Backend security patterns including JWT configuration, rate limiting, input validation, and security headers
What this skill does NOT cover:
- Frontend development, UI components, or client-side state management -- see
senior-frontend - Infrastructure provisioning, container orchestration, or CI/CD pipeline setup -- see
senior-devops - GraphQL schema design, resolvers, or subscriptions -- see
senior-fullstack - Application performance monitoring (APM), distributed tracing, or log aggregation -- see
senior-secops
Integration Points
| Skill | Integration | Data Flow |
|---|---|---|
senior-fullstack | API routes generated here feed into fullstack project scaffolding | OpenAPI spec → fullstack scaffolder consumes as API contract |
senior-devops | Migration scripts output here are consumed by CI/CD deployment pipelines | migrations/ directory → deployment workflow applies and verifies |
senior-security | Load test results and security hardening output feed into security review | Load test JSON → security audit validates rate limiting and error handling |
senior-qa | Generated route handlers and validators provide test surface for QA automation | Route files + Zod schemas → QA generates integration test suites |
senior-frontend | TypeScript types generated by the scaffolder are shared with frontend consumers | types.ts → frontend imports API types for type-safe client code |
code-reviewer | Schema analysis issues and migration diffs feed into code review checklists | Analysis report → reviewer validates index coverage and naming conventions |
FAQ
What does the senior-backend skill do?
Backend development with Node.js/Express/Fastify and PostgreSQL. Use when designing REST or GraphQL APIs, optimizing database queries, implementing authentication, building microservices, handling migrations, or reviewing backend code.
How do I install senior-backend?
Run npx skills add https://github.com/borghei/claude-skills --skill senior-backend in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/senior-backend/ (personal) or .claude/skills/senior-backend/ (project).
Which AI agents can use senior-backend?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is senior-backend safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains senior-backend?
It is published by borghei in borghei/claude-skills. It has 291 recorded installs.
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