I co-founded and built the product for a two-person startup for ~3 years. I owned the software side end-to-end while my partner ran the business (operations, sales, customer development). This page highlights the architecture and links to the key repositories.
A mobile app for meeting people to do activities together. Think swipeable match cards, but focused on shared activities, timeframes, and lightweight privacy (built-in chat so you can coordinate without sharing personal info). The system also supports Events—sponsored or community activities that appear as their own cards and drop you into a related chat room if you opt in.
- Pick activities & a timeframe (e.g., Pick-up Basketball this weekend, Sushi tonight, Hiking next week).
- Set preferences (distance, categories, availability).
- Get match cards generated by a server-side matching engine (activity/category overlap, time windows, recency/inactivity rules).
- Swipe Yes/No on each card; on a Yes, a chat room is available so you can coordinate without exchanging personal details.
- Discover Events presented as cards; a Yes opens the event chat and shows the relevant info.
- Pick-Up Sports: Basketball, Soccer, Volleyball
- Food: Brunch, Sushi, Mexican
- Adventures: Hiking, Boating, Skiing
- Social Drinking & Tastings (21+): Beer, Wine
- DIY & Personal Development: Home Care, Investing & Finances
- Video Games: FPS, Racing, MMORPG
See the complete activity list.
- Pick-Up Sports: Baseball, Basketball, Football, Golf, Hockey, Pickleball, Soccer, Ultimate Frisbee, Volleyball
- Working Out: Crossfit, Cycling, Dance, MMA, Pilates, Running, Swimming, Weight Training, Yoga
- Food: American, Brunch, Chinese, Indian, Italian, Mexican, Pho, Sushi, Thai
- Adventures: Band Jam Session, Bar Hopping (21+), Boating, Clubbing (21+), Dancing, Hiking, Shopping, Skiing, Snowboarding, Water Activities
- Social Drinking & Tastings (21+): Beer, Spirits, Wine
- Beauty: Hair, Makeup, Mani Pedi, Skin Care
- Board Games: Catan, Checkers, Chess, Dominoes, Dungeons & Dragons, Monopoly, Pictionary, Scrabble
- Collectable Card Games: Magic The Gathering, Pokemon, Yu-Gi-Oh!
- Concerts: Country, EDM, Hip-Hop, Indie, Jazz, Oldies, Pop, Rap, Rock
- DIY: Cars, Home_Care, Refurbish Items, Restore Antiques
- Movies & TV: Action_Adventure, Comedy, Drama, Reality TV, Thriller_Suspense
- Personal Development: Emotional, Intellectual, Investing & Finances, Relational
- Play Dates (18+): Board Games, Crafts, Fun-In-The-Kitchen, Movies, Outings, Park-Day
- Poker: 5 Card Draw, 7 Card Stud, Blind Man's Bluff, Omaha Hold'em, Texas Hold 'em
- Sporting Entertainment: Baseball, Basketball, Boxing, Football, Golf, Hockey, MMA, Soccer, Tennis
- Video Games: Battle Royale, Digital Card Games, FPS, MMORPG, MOBA, Racing, Sports
- My role: system design, backend (C++), Android (Kotlin), matching engine, integrations, server administration, deployment docs.
- Architecture: stateless C++ Application Server (gRPC/Protobuf) with MongoDB.
- Matching: Mongo aggregation pipeline + C++ converter for embedded execution and speed.
- Clients: Android app for end users and a Desktop Admin Interface (Qt) for moderation/ops and event tools.
- Integrations: SMS + Email providers for notifications and verification as well as account flows.
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Server (C++) — stateless hub, gRPC/Protobuf, MongoDB
👉Lets_Go_Server -
Android Client (Kotlin) — auth, profiles, activities, chat (SDK versions may be dated)
👉Lets_Go_Android_Client -
Desktop Admin (Qt) — admin/ops console for moderation, events, stats, and controls
👉Lets_Go_Interface -
Matching (Algo & Converter) — Mongo aggregation (JS) + C++ converter to embed pipelines
👉Lets_Go_Algorithm_And_Conversion -
Protobuf Files — protobuf files used to communicate between server and clients
👉Lets_Go_Protobuf -
Docs & Deployment Notes — release checklists, SSL testing, Mongo RS commands
👉Lets_Go_Docs
- Architecture & backend: designed the system, authored most server code, defined gRPC/Proto contracts.
- Data & matching: wrote aggregation pipelines and the C++ converter to run them efficiently server-side.
- Android: implemented core UI/flows (auth, profiles, activities, chat).
- Admin interface: contributed features and workflows used for moderation and operations.
- Server administration: provisioned Linux hosts, configured system services, SSL/TLS, backups, and monitoring; operated a MongoDB replica set across separate nodes.
- Integrations: wired SMS and Email providers for notifications and account flows.
- Active development ~3 years.
- The company is sunset, and this code is provided for anyone that it may have value to as well as for portfolio purposes.
- Tooling notes: Android project targets older SDKs; the Desktop Admin uses Qt (modern builds may require current Qt tooling/licensing).
C++ · gRPC · Protobuf · MongoDB (Replica Set) · Android (Kotlin) · Qt · Aggregation Pipelines · SSL/TLS · Gradle/CMake · Linux Server Ops · Wordpress