What I build
AI, iOS, and web development. One engineer, from idea to release.
I’m Mack Grissom, an independent product engineer. Hire me for a focused integration, a complete product, or a clear assessment of what to build next. Start with one workflow to automate, a prototype to repair, or a focused internal tool.
Most AI projects stall at the demo. An agent that impresses in a meeting and cannot be trusted on a Tuesday morning is not a system, it is a prototype.
Three ways to start
Your team spends hours a week on work a system should be doing.
Agentic automation
Scoped tools for repetitive work such as triage, reporting, and content preparation, with review and failure handling appropriate to the task.
- — Task orchestration with priority scheduling
- — Verification gates: a task is done when a check passes, not when the model says so
- — Usage tracking and agreed run limits
Your AI-built app works in the demo. You need it to work for customers.
AI prototype rescue and production hardening
A practical review and implementation engagement for AI-generated applications, unfinished MVPs, and prototypes that need authentication, data integrity, reliable integrations, and a release plan.
- — Codebase and critical-flow assessment
- — Prioritized release-blocker list
- — Scoped implementation of agreed repairs
You know what the business needs. You do not need to know the stack.
Custom software development
Bespoke software built around one business problem: web applications, internal tools, iPhone apps, and the integrations between them. The technology is chosen after the problem is understood, not before.
- — A scoped build with a named first release
- — Web application, internal tool, or iPhone app as the problem requires
- — Integrations with the systems you already run
More capabilities
You want clearer approval steps and visibility into an AI workflow.
Approval workflows and activity logs
Application-level approval checks and activity records for a defined workflow. Not a penetration test, compliance audit, or guarantee of complete isolation.
- — A map of the workflow's actions and permissions
- — Activity logging with documented coverage and limitations
- — Autonomy levels that withhold deploy, spend and production writes
You need the product itself shipped, not a proof of concept.
AI product development
Web and iOS product development, with AI integration where it supports a clear user task. Launch and ongoing support are scoped separately.
- — iOS and web applications, App Store submission included
- — LLM integration with cost and latency budgets
- — Retrieval and evaluation pipelines
You already have AI in production and are not sure what it is doing.
AI systems review
A scoped developer review of an AI workflow, based on the code and evidence available. Findings, uncertainties, and suggested next steps are documented.
- — Failure-mode and blast-radius analysis
- — Cost and token accounting against actual usage
- — Review of visible permissions and data flows
Your customers need answers your team keeps repeating.
Custom AI chatbot development
Custom support assistants and internal chatbots that use your approved information, fit your website or application, and hand the conversation to a person when they should.
- — Website or in-app chat interface
- — Approved knowledge sources and answer citations
- — Authentication and action permissions where needed
Your company knows the answer. Finding it takes too long.
RAG development and AI document search
Retrieval-augmented generation for internal knowledge bases, document assistants, and search experiences that need answers grounded in your own information.
- — Document ingestion and update pipeline
- — Search or conversational interface with citations
- — Permission-aware retrieval design
You have an application. Now you need AI that fits it.
LLM API integration for existing products
Add language-model features to an existing web or mobile product: structured extraction, summarization, assistants, and tool use, with the application logic needed to make them dependable.
- — Server-side model integration and secure configuration
- — Streaming or structured-output experience as appropriate
- — Validation, timeouts, cancellation, and error handling
You need someone who can take an iPhone app all the way to release.
Freelance iOS and SwiftUI app development
Native iOS product development from the first useful flow to TestFlight and App Store submission. Work directly with the engineer who designs, builds, and prepares the release.
- — Native SwiftUI application and project source
- — Core product flows and Apple platform integrations
- — Backend and authentication integrations where scoped
Your web product needs more than a landing page.
Freelance Next.js and React development
Custom web applications, SaaS MVPs, marketplaces, and product websites built with Next.js, React, and TypeScript, including the backend workflows that make them useful.
- — Responsive React and Next.js application
- — Authentication, data model, and backend integrations
- — Core workflow validation and failure states
Your website should be remembered after the tab closes.
Creative WebGL and Three.js development
Interactive 3D websites and creative frontend development with Three.js and WebGL, paired with readable content, responsive layouts, and a usable fallback.
- — Art direction and interactive concept
- — Three.js scene integrated with the frontend
- — Responsive interface and accessible controls
Published prices
Most automation work fits one of four fixed-scope packages, from a $299 workflow audit to a 7-day automation sprint and internal AI tools. Prices are on the page, not behind a call.
See pricingWhy the controls are the product
I run this myself: an orchestrator that picks and executes work overnight on enforced budgets, refuses to mark a task done unless a verification command exits zero, and escalates to me after three failures.
One person, with leverage
You work directly with me on scope, implementation, and progress. I use AI tools as part of development and remain responsible for reviewing the work. I’ll be clear when a project needs specialist help or is outside my scope.
I work remotely from Thailand with clients wherever they are. The time zone overlaps European mornings and North American evenings, and unattended systems do not care where their developer sleeps.
Read before you buy
- Is Your AI Agent Ready to Run Unattended? A 10-Point Production ChecklistTen checks to run before an AI agent or automation touches real business systems unattended: scope, permissions, approvals, evaluation, retries, monitoring, cost, and recovery. With a go/no-go scorecard.
- How to Hire an AI Automation Developer: Questions, Red Flags and What It Should CostA buyer's guide to hiring someone to automate a workflow with AI: how to describe the job, what to ask on the first call, the red flags, and what fixed-price work should cost in 2026.
- Claude vs GPT in 2026: Choose by Task, Not BrandCompare current Claude and GPT models using your workflow, acceptance tests, latency, and cost per accepted task. A practical evaluation brief for buyers.
- AI Chatbot for Your Business: The Complete Guide to Custom Chatbot DevelopmentEverything you need to know about building a custom AI chatbot for your business. Covers costs, features, platforms, and when to build vs buy.