Hey there. I'm

Tim
Longfield

Planning & Advice Mobile Solutions

Fidelity Investments | Wealth Management

Tim Longfield

Available for new projects

Senior
iOS Engineer

"Tim has the ability to hold the goals of engineering, design and customer experience in concert, and find solutions that can benefit all parties."

Software Engineer at Apple

(Former Principal Mobile Architect at Fidelity)

Timeline

My Journey

A visual representation of some accomplishments and milestones throughout my career.

September 2018

Enrolled at Boston College

  • Enrolled as biochemistry major
  • Pivoted to Computer Science after founding CampusPost iOS
December 2019
CampusPost

Co-founded CampusPost

CampusPost

  • Co-founded marketplace app for college students
  • Learned SwiftUI and iOS fundamentals
February 2021
YOKE Gaming

Joined YOKE Gaming as iOS Developer

YOKE Gaming

  • Joined startup to rebuild #5 U.S. App Store app
  • First experience on development team
June 2021
DBACH Fitness

Co-founded DBACH Fitness

DBACH Fitness

  • Partnered with fitness guru Daniel Bachmann
  • Developed app for 15% stake in company
July 2021
CampusPostUnibui

Sold CampusPost to Unibui

Unibui

  • Negotiated cash and equity buyout to San Jose company
  • Stayed on for six months to integrate with APIs
Summer 2021
Trendset

Co-founded Trendset

Trendset

  • Built photo editing creator marketplace
  • Partners with 1M+ Instagram followers
November 2021
Unibui

Rebuilt Unibui 2.0

Unibui

  • Launched Unibui iOS 2.0
  • Developed Unibui Android
Spring 2022
Boston College

Neural Network Research

Boston College

  • Built Poker Hand Classification Model
  • Simulated 10,000 Texas Hold’em rounds
May 2022
Boston College

Graduated Boston College

Boston College

  • Received B.S. in Computer Science
  • Concentration in Neural Networks and Machine Learning
June 2022
Fidelity Investments

Joined Fidelity Investments

Fidelity Investments

  • Enrolled in LEAP program (4-month technical bootcamp)
  • Joined Autonomous Finance Mobile Team
July 2023
Fidelity Investments

Promoted to Mobile Developer

Fidelity Investments

  • First promotion at Fidelity
  • Recognized technical expertise
November 2023
AlumnAI

Co-founded AlumnAI

AlumnAI

  • Built AI interview prep app using ChatGPT API
  • (pre-GPT-4 voice was available)
December 2023
DBACH Fitness

Acquired Majority Stake in DBACH Fitness

DBACH Fitness

  • Bought partner’s 35% stake, growing to 50% ownership
  • Rebuilt app, stabilized purchases
  • Consistent paying users
September 2024
Fidelity Investments

Filed Adaptive Savings Patent

Fidelity Investments

  • Led team at Fidelity 2024 Hackathon
  • Submitted U.S. patent application
November 2024
AlumnAI

Sold AlumnAI to Clockwerk LLC

AlumnAI

  • Negotiated cash buyout with Clockwerk LLC
  • Transitioned app asset ownership
December 2024
Fidelity Investments

Promoted to Senior Mobile Developer

Fidelity Investments

  • Second promotion at Fidelity
  • Led mobile initiatives and conducted interviews
Summer 2025
Captiva AI

Co-founded Captiva AI

Captiva AI

  • Founded an AI SEO analytics platform
  • Signed consulting contracts
Now

Testimonials

What Colleagues Say

Feedback from the engineers, designers, and product leaders I've worked with at Fidelity and beyond.

"Tim is one of our brightest stars of iOS development at Fidelity. He constantly stands out in the iOS community as a developer who is constantly pushing the boundaries of what's possible, and capable of imagining how the entire community can build the best products for our customers. Tim has the ability to hold the goals of engineering, design, and customer experience in concert, and find solutions that can benefit all parties. This isn't something I've seen many times in Fidelity.

Even further, he is a great communicator and a consistent contributor to the iOS community at large. He is the rising tide that raises everyone's skills.

In the future, Tim should be working on scaling his solutions, making his ideas "official" best practices, and getting exposure to bigger problems with bigger impact solutions. Additionally, he shouldn't hesitate to guide developers in peer teams' products and frameworks. His expertise is necessary and welcome across the codebase."

Software Engineer at Apple (Former Principal Mobile Architect at Fidelity)