Contact
Let's Talk About Your Project
Have an app or product idea? I'd love to hear about it. I typically reply within 1-2 business days.
Opens your email app, addressed to timlongfield@gmail.com.
A good first message includes:
- A sentence or two about what you're building
- A rough timeline
- A ballpark budget, if you have one
Raleigh, NC
Years Building Software
Products Founded
Successful Acquisitions
US Patent Filed
What I Build
Four areas where I consistently deliver the most value for founders and product owners.
Mobile App Development
Native iOS apps built the right way, from a senior engineer who ships production code at Fidelity Investments every day - not just prototypes.
- Swift & SwiftUI, built for performance and App Store approval
- Clean architecture that your next developer will thank you for
AI-Powered Products
LLM integrations, agentic workflows, and prompt engineering that actually ship - built on real experience, not buzzwords.
- LLM & agentic search integration (built Captiva AI from the ground up)
- Prompt engineering & conversational AI (shipped and later acquired)
Web App Development
Fast, modern, responsive web apps and dashboards using the same React/TypeScript stack powering the platforms I run today.
- React, TypeScript, and Firebase for real-time, scalable apps
- Stripe-powered payments and subscription billing
Product Strategy & Leadership
You get a technical co-founder mindset, not just a contractor - scoping, prioritizing, and shipping with your business goals in mind.
- Technical architecture & roadmap planning
- Hands-on leadership across engineering, design, and UX
Why Work With Me
Plenty of developers can write code. Here's what makes projects with me go smoothly.
Clear Communication
Colleagues consistently point to clear, succinct communication as one of my strongest traits - the kind that keeps stakeholders aligned and projects moving instead of stalling in Slack threads.
Real AI Experience
I've built and shipped LLM-powered products end to end - from an agentic search analytics platform to an AI interview-prep app that was acquired. I know where AI genuinely helps a product, and where it's just noise.
Proven Track Record
Senior Mobile Developer at Fidelity Investments, a U.S. patent application for AI-driven savings forecasting, a Boston College CS degree focused on machine learning, and two ventures taken all the way to acquisition.
How It Works
A straightforward process, so you always know what's happening and why.
Discover
We start with a conversation about your goals, users, and constraints - no jargon, no pressure, just figuring out if and how I can help.
Design & Plan
I scope the technical approach and design direction together, so what gets built actually fits how your product needs to grow.
Build
Focused, iterative development with regular check-ins - you always know what shipped, what changed, and what is next.
Launch & Support
I stick around after launch. Shipping is the start of a product's life, not the finish line.
Tools & Technologies
The stack behind everything I ship
React
TypeScript
Firebase
Stripe
SwiftSwiftUI
OpenAI
RevenueCat
StoreKit
Core Data
App Store Connect
Kotlin
Jetpack Compose
JavaScript
Angular
Node.js
HTML5
CSS3
GraphQL
REST
Splunk
Plaid
Figma
MATLAB
Python
TensorFlow
KerasThank you, Tim, for leading multiple teams through the process of deciding the best way to handle a recent production issue. Often these conversations can spiral and end up wasting time. But you avoided that by providing clear and succinct communication, responding quickly and kindly, and ultimately helped us to reach a resolution that everyone was comfortable with within a day's time.
Product Leader, Personalized Wealth Client Experience, Fidelity
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