Justin is available for hire

Justin Barnett

Verified Expert in Engineering

Software Developer

New York, NY, United States

Toptal member since March 3, 2022

Expertise

Python Java PostgreSQL AWS MacOS React.js Django PHP Solidity C++Golang Redis Ruby Objective-C

Bio

Justin is a software engineer specializing in the back end and infrastructure. His most proficient languages are Python, Java, React, and JavaScript, and he has worked at big tech companies such as Amazon, Uber, and VMware. As a long-term strategic thinker, Justin focuses on software development at all stages.

Portfolio

Google

C++, Python 3

Interlace Ventures

Python, Django, Webflow

Amazon.com

Java, React, Python

Experience

MacOS - 6 years
PostgreSQL - 4 years
Python - 4 years
React - 3 years
Java - 2 years
PHP - 1 year
Solidity - 1 year
Django - 1 year

Availability

Part-time

Preferred Environment

MacOS, IntelliJ IDEA

The most amazing...

...thing I've made is an algorithmic trading bot that monitors market fluctuations and makes trading decisions.

Work Experience

Software Engineer

2022 - PRESENT

Google

Implemented horizontal data access compliance for Google Monarch. Added data auditing to data fields and restricted access to Google Cloud Platform customer data. Developed a parser to identify and extract personal customer info from requests.
Wrote technical approach to identify changes affecting build targets through transitive dependencies updates. Implemented a technical approach to create an audit trail for building target changes.
Created new alerts to monitor failures and latency spikes in the rollout plugin.
Provided mentorship for new team members. Contributed to customer support OKR by modifying and onboarding our team to an automated survey sender tool created by a different team written in Go.

Technologies: C++, Python 3

Software Engineering Consultant

2021 - 2022

Interlace Ventures

Iterated on investment pipeline written in Python and migrated data streams to work with new versions.
Created tooling to automate permissions to financial data, allowing fine-grain control of company data. Made better data checks to improve the quality of the firm’s database.
Converted the startup data structure from a siloed data structure to a graph data structure and increased investor efficiency by enabling faster research.

Technologies: Python, Django, Webflow

Software Development Engineer

2020 - 2022

Amazon.com

Contributed to Sonata, a platform that ingested hundreds of different data providers across Amazon, enabling marketers to create strategies for showing content that fed data into a content pipeline. Supported over 3,000 different configurations.
Led the automating strategy migration so that internal strategies could be created and managed by external marketers, which led to the completion of an initiative that will bring in 100 million in profit for 2021-2023.
Provided direct support to the customers and worked with the product teams to create new features for automating marketing processes and increasing efficiency.

Technologies: Java, React, Python

Founder

2017 - 2020

Delta X Technology LLC

Pursued and launched various entrepreneurial endeavors, such as creating a brand of generic vacuum batteries on Amazon 3P. Imported and sold multiple products, including electric scooter chargers and parts.
Acted as a contractor for various seed-stage companies; clients included Hairdoo and Blunt Boxes.
Relaunched the first version of the Hairdoo iOS app. Built new features, such as new user onboarding flow, urgency timers, rebooking flow, rebooking from past appointments, and referring a friend.
Built the first version of a web ordering portal for a cannabis dispensary in Southern California. Built web ordering flow, handled payments on Stripe, and used Twilio for text messaging.

Technologies: Python, PHP

Software Engineering Intern

2016 - 2016

Uber

Created China Toggle in Objective-C to show off new pricing in UberPool 2.0. Increased adoption by 0.4%.
Engineered Give 1 Get 1 microservice using Go and increased the sharing by 0.1%.
Created the accessibility features for the Uber iOS app.

Technologies: Go, Objective-C

Software Engineering Intern

2015 - 2015

VMware

Developed an automated VM monitoring solution using Nagios and internal APIs.
Automated creation of host CFG files by developing Python scripts and leveraging Presto APIs and other internal tools.
Created an automated deployment solution using Puppet to enable VM monitoring solution remote deployment.

Technologies: Ruby, Python

Experience

DailyStockMarketData.com

DailyStockMarketData.com is a platform that delivers daily stock market data in a convenient CSV. It provides new data every day at about 4:30 pm EST on trading days and offers the subscription feature. The platform can be used to backtest the customer's trading strategies and perform market research.

SparkVid

SparkVid is a video transcription tool that helps users quickly skim video hours.

I got an idea for this tool during COVID-19 after watching hours of videos on meetings and lectures, so I created SparkVid to skim those videos and save users time and energy.

Education

2013 - 2017

Bachelor's Degree in Computer Engineering

University of Illinois at Urbana Champaign - Champaign, IL, USA

Skills

Libraries/APIs

React

Tools

IntelliJ IDEA

Languages

Java, Python, C++, PHP, Solidity, Go, Ruby, Objective-C, Python 3

Platforms

Amazon Web Services (AWS), MacOS, Webflow

Storage

PostgreSQL, Redis

Frameworks

Django

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring