Jeffallan

Streamline game development with optimized systems for Unity and Unreal Engine.

Streamline the development of enterprise-grade TypeScript backend applications with NestJS.

Build robust PHP applications using modern features and frameworks like Laravel and Symfony.

Design high-level system architecture and make informed architectural decisions.

Build high-performance async Python APIs with FastAPI and Pydantic V2.

Master C# development with .NET 8+, building high-performance APIs and Blazor apps.

Expert skill for building and optimizing React 18+ applications with advanced features.

Enhance TypeScript applications with advanced type systems and end-to-end type safety.

Expertly build and debug Shopify themes and apps while integrating with the Storefront API for headless commerce.

Analyzes code diffs and files to identify bugs, security vulnerabilities (SQL injection, XSS, insecure deserialization), code smells, N+1 queries, naming issues, and architectural concerns, then produces a structured review report with prioritized, actionable feedback. Use when reviewing pull requests, conducting code quality audits, identifying refactoring opportunities, or checking for security issues. Invoke for PR reviews, code quality checks, refactoring suggestions, review code, code quality. Complements specialized skills (security-reviewer, test-master) by providing broad-scope review across correctness, performance, maintainability, and test coverage in a single pass.

Develop firmware for microcontrollers and optimize real-time systems.

Expert skill for building Django web applications and REST APIs with Django REST Framework.

Extract specifications from legacy or undocumented codebases with ease.

Efficiently perform data manipulation and analysis using pandas DataFrames.

Enhance Python 3.11+ applications with type safety, async programming, and robust error handling.

Facilitates structured workshops to define feature specifications and requirements.

Implement infrastructure as code using Terraform across AWS, Azure, and GCP.

Expert skill for fine-tuning LLMs and training custom models using parameter-efficient techniques.

Expert tool for writing E2E tests with Playwright, enhancing browser automation and test reliability.

Designs microservices architectures and decomposes monoliths into bounded-context services.

Optimize PostgreSQL performance with advanced query analysis and replication configuration.

Optimizes and debugs C++ applications using modern C++20/23 features and high-performance techniques.

Develop and optimize Salesforce applications using Apex and Lightning Web Components.

Specialized skill for building and debugging enterprise Java applications with Spring Boot 3.x and microservices.

Expertly manage Kubernetes workloads with best practices and security measures.

Ensures software quality through comprehensive testing strategies across functional, performance, and security domains.

Streamline CLI tool development with robust argument parsing and interactive prompts.

Build Vue 3 applications using Composition API patterns and optimize performance.

Expert Kotlin implementation patterns for coroutines, multiplatform development, and Compose UI.

Generates Angular 17+ applications with standalone components and advanced state management.

Build and debug MCP servers and clients for AI systems with external tools.

Facilitates the modernization of legacy systems through incremental migration strategies and API facade designs.

Streamline site reliability engineering with defined SLOs and automated incident management.

Design and implement production-grade RAG systems for effective document retrieval and semantic search.

Build and optimize cross-platform mobile applications using React Native and Expo.

Expert skill for building high-performance cross-platform applications using Flutter 3 and Dart.

Facilitates chaos engineering by designing experiments and implementing failure injection frameworks for distributed systems.

Expertly builds iOS/macOS applications using Swift, SwiftUI, and async/await.

Expertly configures monitoring systems for observability and performance optimization.

Optimizes database queries and enhances performance for PostgreSQL and MySQL systems.

Challenge ideas and decisions using structured critical reasoning to uncover blind spots and assumptions.

Writes, refactors, and evaluates prompts for LLMs — generating optimized prompt templates, structured output schemas, evaluation rubrics, and test suites. Use when designing prompts for new LLM applications, refactoring existing prompts for better accuracy or token efficiency, implementing chain-of-thought or few-shot learning, creating system prompts with personas and guardrails, building JSON/function-calling schemas, or developing prompt evaluation frameworks to measure and improve model performance.

Design REST and GraphQL APIs with comprehensive OpenAPI specifications.

Generate Spring Boot 3.x applications with REST controllers and security configurations.

Build Vue 3 applications using JavaScript with JSDoc typing instead of TypeScript.

Systematically isolates and resolves bugs in codebases using structured methodologies.

Build secure full-stack web applications with integrated frontend and backend components.

Rails 7+ specialist for optimizing Active Record and implementing real-time features.

Write, debug, and refactor JavaScript code using modern ES2023+ features and best practices.

Expertly write, review, and debug idiomatic Rust code with a focus on memory safety and performance.

Expertly build and configure Laravel 10+ applications with advanced features.

Integrates with Atlassian products to streamline project tracking and documentation using MCP protocol.

Expertly develop custom WordPress themes and plugins while optimizing performance and security.

Design and optimize GraphQL schemas with Apollo Federation and real-time subscriptions.

Implement robust security practices to prevent vulnerabilities and secure user data.

Build real-time communication systems using WebSockets or Socket.IO for bidirectional messaging and room management.

Identifies security vulnerabilities and generates structured audit reports with actionable remediation guidance.

Automate the generation and validation of technical documentation for code, APIs, and user guides.

Implements concurrent Go patterns using goroutines and channels, designs and builds microservices with gRPC or REST, optimizes Go application performance with pprof, and enforces idiomatic Go with generics, interfaces, and robust error handling. Use when building Go applications requiring concurrent programming, microservices architecture, or high-performance systems. Invoke for goroutines, channels, Go generics, gRPC integration, CLI tools, benchmarks, or table-driven testing.

Design and implement production-grade ML pipelines with robust orchestration and automation.

Designs cloud architectures and migration plans while optimizing costs and ensuring disaster recovery across major cloud platforms.

Expert guidance for building .NET 8 applications with minimal APIs and clean architecture.

Creates Dockerfiles, configures CI/CD pipelines, writes Kubernetes manifests, and generates Terraform/Pulumi infrastructure templates. Handles deployment automation, GitOps configuration, incident response runbooks, and internal developer platform tooling. Use when setting up CI/CD pipelines, containerizing applications, managing infrastructure as code, deploying to Kubernetes clusters, configuring cloud platforms, automating releases, or responding to production incidents. Invoke for pipelines, Docker, Kubernetes, GitOps, Terraform, GitHub Actions, on-call, or platform engineering.

Optimize Apache Spark applications and debug performance issues with this comprehensive skill.

Expertly build and deploy Next.js 14+ applications with a focus on performance and SEO.

Optimizes SQL queries, designs database schemas, and troubleshoots performance issues.

Use when assessing body fat percentage from skinfold measurements, calculating body density, or interpreting body composition results using Durnin-Womersley or Jackson-Pollock equations.

Use when estimating one-rep max (1RM), converting between weight and rep ranges, or calculating training loads from a validated percentage-of-max table.

Use when planning macronutrient targets, calculating daily calorie ranges, or building meal plans based on body type, activity level, and fitness goals.