ExperienceSkillsProjectsResume

Hi, I'm Jonathan
Full Stack Developer
Based in New York City

I graduated from Williams College and spent 4 years modeling and analyzing electrical grids at Environmental Systems Research Institute. I then CoFounded Cordate, a social networking app that allows users to create dates using GenAI, discover them, send them to friends, add them to their calendar, and more. I'm passionate about learning new technologies, automating processes that simplify life, and building tools that bring people together.

My Experience

CoFounder and CTO @ Cordate
July 2020 - Present
- Launched a social networking app that attracted hundreds of users in 3 months by enabling date creation (using GenAI), discovery, sharing, calendar integration, and more.
- Delivered personalized infinite scrolling user feeds with < 300 ms latency using paginated cursors.
- Cut image load times to < 250 ms by building a multi-resolution upload system with resolution-aware URL caching.
- Engineered sub-1s user feed filtering on various fields, including: user name (prefix matching), location (PostGIS), relationship to user (friends, mutuals, non-friends), gender of poster, date activity, day of date, etc.
- Doubled DAU to 110 by launching real-time and scheduled push/SMS notifications via GCP Pub/Sub.
- Built a fullstack desktop app for Windows and MacOS to migrate 40K+ users to the new app.
- Increased avg. session time 56% by deep linking to profile-centric feeds based on user analytics, boosting retention.
- Increased weekly posted dates 32% by enabling users to describe an ideal date and generating them using Open AI.
- Leveraged Firestore streams to implement responsive (< 200 ms) in-app messaging for up to 30 participants.
- Implemented a data access layer that enables CRUD operations, serialization, deserialization, and paginated queries for SQL (PostgreSQL), NoSQL (Firestore), and storage (Firebase Storage).
- Built a modular serverless API that supports transactional integrity between edits to PostgreSQL and Firebase.
- Reduced onboarding abandonment from 20% to < 5% by implementing a progressive authentication system that gates richer features behind more complete accounts. Users can also browse the app as guests!
Sofware Engineer II @ ESRI
July 2020 - August 2024
- Boosted performance 28% across various graph traversal services by implementing dynamic eviction strategies and dynamic associativity in our C++ caching layer.
- Migrated 40K+ users to ArcGISPro by building a fullstack desktop app, leveraging the optimized graph traversals.
- Slashed onboarding time by 80x for 15+ teams by designing an intermediary class that injected timezone-aware logic into legacy systems, abstracting migration complexity.
- Diagnosed performance bottlenecks for ESRI partners, and sped up execution up to 37% with custom solutions.
NSF Funder Researcher @ Washington University in St. Louis
Oct 2017 - Dec 2018
- Built an interactive React & Django site displaying 2.5K+ restaurants with dynamic filtering and visualization using D3.js.
- Used statistical models to infer what restaurants interest users, and ran Statsig A/B tests to determine which UX users preferred: enlarging points of interest, shrinking non-points of interest, or combining both methods.
- Cut model latency from 4.4s to 0.2s by persisting user click history in sessions and optimizing model transfer via BSON serialization in Python.
Teaching Assistant @ Williams College
Aug 2015 - Sep 2017
- Wrote a script to help students download course material for exam review - it also became useful for other classes.
- Graded projects and homework, as well tutored and helped > 150 students debug for 10 hrs / week for 3 courses.
- Algorithms: tutored in topics like greedy algorithms, interval scheduling, network flow, and dynamic programming.
- Theory of Computation: topics included automata, language theory, complexity theory, and computability theory.
- Computer Systems: topics included compilers, memory, networks, operating systems, and distributed systems.

My Skills

Typescript

Python

C++

C#

Beautiful Soup

Firebase

Tailwind CSS

React

Django

My Projects

01
Cordate
Cordate is a social networking app that allows users to create dates using GenAI, discover them, send them to friends, add them to their calendar, and more. Email me at jonathan@cordate.us for feature requests!
02
File Downloader
Given a set of urls and file formats, this downloads all files of provided formats from the urls.
03
Genius Crawler
Generates lyrics using a freq dictionary of all lyrics parsed from Drake’s lyrics on Genius.com.
04
Wordle Solver
Walks you through solving today's wordle by enumerating all possible subsequent guesses.
05
Spelling Bee Solver
Helps you achieve Queen Bee by enumerating all possible words for today's Spelling Bee (by default, or configure it to your liking.)
06
Scrabble Word Finder
Developed a word searcher that uses regex characters ‘?’ (matches one or none characters) and ‘*’ (zero or more characters) to search for containment, prefixes, suffixes.
07
Personal Website
I periodically freshen up my CLI projects with a new UI and release this on my website so that it’s open to the public. Stay tuned for updates!