Marketplace
Agents
Agents for Haarness: specialists with their own instructions and tools, for reviewing, testing, writing and more.
Threat Modeling Expert
Walks a system through STRIDE and attack trees to rank threats and propose mitigations.
Startup Analyst
Sizes markets, models startup finances and unit economics, and maps competitors for early-stage founders.
Test Automation Engineer
Plans and builds automated test suites, TDD loops and CI test gates across unit, API and UI layers.
UI/UX Designer
Plans interfaces, user flows and design systems with tokens, research methods and accessibility built in.
TypeScript Expert
Designs strict TypeScript types, generics and tsconfig setups for large codebases.
Developer Experience Optimizer
Smooths project setup and daily workflows with scripts, hooks, task runners and clearer READMEs.
TDD Coach
Keeps work on a strict red-green-refactor cadence and plans test-first steps across a feature.
SQL Expert
Writes and optimises complex SQL across OLTP and warehouse engines, from window functions to indexing.
SEO Content Writer
Drafts search-friendly articles from a keyword brief, with title options, meta description and FAQ.
Rust Expert
Helps with ownership, lifetimes, async Tokio services, FFI and performance work in Rust.
DevSecOps Security Auditor
Audits app and cloud security posture, threat models and compliance needs, and wires security into CI.
Ruby Expert
Helps write idiomatic Ruby and Rails code, gems and RSpec suites with RuboCop hygiene.
FastAPI Expert
Designs async FastAPI services with Pydantic v2, SQLAlchemy 2 and solid testing and observability.
Python Expert
Writes and tunes modern Python with typing, async, uv/ruff tooling and pytest-backed tests.
Django Expert
Builds Django 5 apps and DRF APIs, tuning ORM queries and wiring Celery and Channels.
Prompt Engineer
Drafts and refines prompts and system prompts, always showing the full prompt text with test ideas.
PHP Expert
Produces typed, memory-efficient PHP 8 code using generators, SPL structures and PSR conventions.
Payment Integration
Implements Stripe or PayPal checkouts, subscriptions and verified, idempotent webhooks with PCI care.
Performance Engineer
Profiles and load-tests applications, then fixes bottlenecks with caching, query and frontend tuning.
ML Engineer
Takes ML models to production: serving, feature pipelines, monitoring and inference optimisation.
MLOps Engineer
Sets up ML pipelines, experiment tracking, model registries and automated retraining across clouds.
Mermaid Diagram Expert
Turn a description of a system or process into a Mermaid diagram for docs.
Kubernetes Architect
Designs Kubernetes platforms with GitOps, service mesh, policy, autoscaling and multi-tenancy.
JavaScript Expert
Helps write and debug modern JavaScript for Node and browsers, with a focus on async flow and event-loop issues.
iOS Swift Developer
Builds native iOS apps in Swift and SwiftUI, covering persistence, testing and App Store readiness.
Java Expert
Supports Java 21+ and Spring Boot work, including virtual threads, JVM tuning and Testcontainers tests.
Mobile App Developer
Plans and builds cross-platform or native mobile apps, from offline sync to store releases.
Terraform Specialist
Writes and structures Terraform or OpenTofu modules, state backends and policy checks for multi-env infra.
Incident Responder
Guides a live incident from triage and stabilisation through communications to a blameless postmortem.
Cloud Architect
Designs AWS, Azure, GCP or OCI architectures with IaC, cost controls, security and disaster recovery.
Go Expert
Builds concurrent Go services with goroutine patterns, profiling and table-driven tests.
Code Review Expert
Reviews changes for security, performance, configuration and maintainability issues with concrete fixes.
React Frontend Developer
Builds React 19 and Next.js interfaces with good state handling, accessibility and Core Web Vitals.
Architecture Reviewer
Reviews system designs and changes for architectural soundness, DDD boundaries and scalability risks.
DevOps Troubleshooter
Diagnoses production issues across logs, traces, Kubernetes, networking and CI to find root causes fast.
Flutter Expert
Helps architect Flutter and Dart 3 apps for mobile, web and desktop, including state management and tests.
CI/CD Deployment Engineer
Builds CI/CD pipelines and progressive delivery (canary, blue-green) with security scanning and rollbacks.
Root Cause Debugger
Finds the root cause of errors and failing tests, applies a minimal fix and checks it.
Legacy Modernizer
Plans incremental upgrades of legacy code and frameworks with tests first and rollback steps.
Data Scientist
Runs statistical analysis, experiments and predictive modelling, and explains results to stakeholders.
Backend Security Coder
Writes hardened backend code: input validation, auth, CSRF/SSRF defences, safe queries and security headers.
Database Architect
Chooses databases and designs schemas, indexes, partitioning and migration plans for new or reworked systems.
Data Engineer
Designs batch and streaming data pipelines, warehouses and lakehouses with quality checks and orchestration.
C# .NET Expert
Writes modern C# for .NET apps with async patterns, records, xUnit tests and BenchmarkDotNet.
Modern C++ Expert
Write safe, modern C++ with clear ownership, templates and builds that pass sanitizers.
Docs Architect
Turns an existing codebase into long-form technical documentation covering architecture and design rationale.
Business Analyst
Builds KPI frameworks, dashboards and business analyses that end in clear recommendations.
Content Marketer
Plans content strategy, editorial calendars and channel distribution for SEO, social and email.