Backend

Design and implement RESTful API endpoints following REST principles with proper HTTP methods, status codes, resource-based URLs, and rate limiting. Use this skill when creating or modifying API endpoints, route handlers, controllers, or any backend API layer code. Apply when working on files that define API routes (routes/*.ts, controllers/*.ts, api/*.ts, *Controller.cs), implement request/response handlers, establish API versioning, or configure endpoint middleware. Use when building Bun/Express APIs, ASP.NET Core Web APIs, or Next.js API routes. This skill ensures RESTful design with clear resource-based URLs, consistent lowercase hyphenated naming, appropriate HTTP methods (GET, POST, PUT, PATCH, DELETE), proper status codes (200, 201, 400, 404, 500), plural nouns for resources (/users, /products), limited nesting depth (2-3 levels max), query parameters for filtering/sorting/pagination, API versioning strategies, and rate limiting headers in responses.

Intelligent financial management skill for Claude Code that provides comprehensive PocketSmith API integration with AI-powered analysis, transaction categorization, rule management, tax intelligence, and scenario planning. Use when working with PocketSmith data for (1) Transaction categorization and rule management, (2) Financial analysis and reporting, (3) Australian tax compliance (ATO) and deduction tracking, (4) Scenario analysis and forecasting, (5) PocketSmith setup health checks, (6) Budget optimization and spending insights.

Implement proper error handling patterns for n8n nodes using NodeApiError and NodeOperationError classes. Use this skill when writing try-catch blocks in execute methods, handling HTTP errors, validating parameters, parsing API error responses, implementing continueOnFail logic, writing actionable error messages, or handling errors in trigger nodes. Apply when working with external API calls, authentication errors, rate limiting, or any error scenarios in n8n node development.

Distributed training strategies including DistributedDataParallel (DDP) and Fully Sharded Data Parallel (FSDP). Covers multi-node setup, checkpointing, and process management using torchrun. (ddp, fsdp, distributeddataparallel, torchrun, nccl, rank, process-group)

Integrate GitHub Core Apps with Actions workflows for org-scoped automation. Generate tokens, access APIs, and implement cross-repository operations patterns.

Apply Terraform changes safely in this infrastructure monorepo. Use when user asks to apply terraform, run terraform plan/apply, make infrastructure changes, update cloud resources, modify node pools, change cluster configuration, or update provider versions. Handles TFC remote execution.

Expert knowledge for using Azure Resource Manager (ARM) template functions, especially reference(), listKeys(), and resourceId() in subscription-level and nested deployments. Use when working with ARM templates, encountering template validation errors, or implementing cross-scope resource references.

Expert Go/Golang development including writing code, APIs, handlers, middleware, testing with go test, dependency management with go mod, and applying best practices from Context7. Use when user asks to write, modify, or debug Go code, mentions Golang, Go modules, go test, go build, REST APIs in Go, or working with .go files.

Node.js/Express/TypeScript microservices development patterns. Use when working with backend code: routes, controllers, services, repositories, middleware, APIs. Covers: - Layered architecture (routes → controllers → services → repositories) - Express routing and middleware patterns - Prisma database access and ORM best practices - Zod validation and input sanitization - Sentry error tracking integration - BaseController pattern and dependency injection - Async/await patterns and error handling - Testing strategies and performance monitoring

FastAPI - Modern Python web framework for building APIs with automatic validation, documentation, and async support. Use for API routes, dependency injection, Pydantic models, middleware, and authentication.

Run and verify backend tests for the FastAPI/Python application.

Integration patterns for web search grounding, including query operator usage, API-based search orchestration, and citation metadata mapping. Triggers: google-search, grounding, search-api, citations, search-operators, web-search.

Use when working with authentication, API routes, user input, or sensitive data. Audits code for security vulnerabilities based on OWASP Top 10. Critical for payment processing, auth systems, and data handling.

Use when encountering n8n workflow issues, Code node errors, HTTP requests failing, data flow problems, environment variables not working, JSON parsing errors, or need n8n development patterns and debugging strategies

A test skill in a nested directory with file references

Comprehensive skill for working with Azure DevOps REST API across all services including Boards (work items, queries, backlogs), Repos (Git, pull requests, commits), Pipelines (builds, releases, deployments), Test Plans, Artifacts, organizations, projects, security, extensions, and more. Use when implementing Azure DevOps integrations, automating DevOps workflows, or building applications that interact with Azure DevOps services.

Complete Medusa backend API reference and integration guide

Convex backend patterns with security, validation, and performance best practices

Knowledge base for updating @lenne.tech/nest-server. Use when discussing nest-server updates, upgrades, migrations, breaking changes, or version compatibility. Provides resources, migration guide patterns, and error solutions. For execution, use the lt-dev:nest-server-updater agent.

Expert in retrieving IT masterdata and data lineage from L'Oréal's BTDP infrastructure. **Use this skill when user asks to search, find, or query for any BTDP/L'Oréal resource including: GCP projects, BigQuery datasets, BigQuery tables, Google Groups, applications, repositories, domains, IT organizations, people/users, GCP services, GCP SKUs, or APIs.** Also use for data lineage queries (upstream/downstream dependencies, parents/children).**Trigger keywords:** "search for project", "find the project", "find dataset", "search table", "what is the project", "what is the dataset", "what is the table", "what is the group", "what is the application", "find group", "search application", "show me project", "get project", "list projects", "lineage", "masterdata", "master data", "BTDP", "SDDS"**DO NOT use filesystem commands** (find, grep, ls) to search for BTDP resources. Always use this skill's RAG indices, MCP tools, or BigQuery SQL queries instead.