Total 50,341 skills, Backend Development has 4128 skills
Showing 12 of 4128 skills
Master automated billing systems including recurring billing, invoice generation, dunning management, proration, and tax calculation.
Use this skill when working with Twilio communication APIs for SMS/MMS messaging, voice calls, phone number management, TwiML, webhook integration, two-way SMS conversations, bulk sending, or production deployment of telephony features. Includes official Twilio patterns, production code examples from Twilio-Aldea (provider-agnostic webhooks, signature validation, TwiML responses), and comprehensive TypeScript examples.
Model Kotlin persistence code correctly for Spring Data JPA and Hibernate. Covers entity design, identity and equality, uniqueness constraints, relationships, fetch plans, and common ORM (Object-Relational Mapping) traps specific to Kotlin. Use when creating or reviewing JPA (Java Persistence API) entities, diagnosing N+1 or LazyInitializationException, placing indexes and uniqueness rules, or preventing Kotlin-specific bugs such as data class entities and broken equals/hashCode.
Expert blueprint for low-level server access (RenderingServer, PhysicsServer2D/3D, NavigationServer) using RIDs for maximum performance. Bypasses scene tree overhead for procedural generation, particle systems, and voxel engines. Use when nodes are too slow OR managing thousands of objects. Keywords RenderingServer, PhysicsServer, NavigationServer, RID, canvas_item, body_create, low-level, performance.
Agent skill for byzantine-coordinator - invoke with $agent-byzantine-coordinator
Use when you need to design, review, or improve REST APIs with Quarkus REST (Jakarta REST) — including resource classes, HTTP methods, status codes, request/response DTOs, Bean Validation, exception mappers, OpenAPI with SmallRye, content negotiation, pagination, sorting and filtering, API versioning, idempotency (Idempotency-Key), optimistic concurrency (ETag / If-Match), HTTP caching (Cache-Control), API deprecation (Sunset / Deprecation headers), RFC 7807 Problem Details, ISO-8601 for time in contracts, and security-aware boundaries. Part of the skills-for-java project
Use when you need to analyze Java profiling data collected during the detection phase — including interpreting flamegraphs, memory allocation patterns, CPU hotspots, threading issues, systematic problem categorization, evidence documentation with profiling-problem-analysis and profiling-solutions markdown files, or prioritizing fixes using Impact/Effort scoring. Part of the skills-for-java project
Look up phone number information (carrier, type, caller name) and verify users via SMS/voice OTP. Use for phone verification and data enrichment. This skill provides REST API (curl) examples.
Manage WebRTC credentials and mobile push notification settings. Use when building browser-based or mobile softphone applications. This skill provides Go SDK examples.
Manage account balance, payments, invoices, webhooks, and view audit logs and detail records. This skill provides Ruby SDK examples.
Use whenever creating, modifying, or debugging payment modules in QloApps — offline methods and online payment gateways. Covers PaymentModule class, payment hooks, checkout integration, validateOrder flow, API credentials, webhook handling, transaction logging, and refunds.
Guides the multi-step Number Order workflow for purchasing phone numbers with KYC compliance via the Sinch Numbers API. Use when buying, ordering, provisioning, or activating Sinch numbers in countries that require KYC registration, regulatory compliance, or identity verification. Triggers on "number order", "KYC", "number registration", "phone number purchase", or "number provisioning".