Freelancers using Python in ChicagoFreelancers using Python in Chicago
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Omar Walweel's avatar
Omar Walweel
Chicago, USA
Backend & AI Engineer | Rust, Python, Distributed Systems
New to Contra
Backend & AI Engineer | Rust, Python, Distributed Systems
Cover image for Built the real-time messaging layer
Built the real-time messaging layer for a production social platform: WebSocket chat with typing indicators, read receipts, reactions, edits, media, and live presence tracked authoritatively in Redis across a multi-worker cluster with no shared memory. Every message passes automated safety screening and encrypted storage on the hot path, with 100% delivery at p50 71ms / p99 326ms send-to-echo, and 400 concurrent sessions held with zero drops and zero errors on a single worker. Cut send latency ~3x by parallelizing ~25 serialized round-trips and moving link-preview generation off the hot path.
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Cover image for Built the behavioral matchmaking engine
Built the behavioral matchmaking engine at the core of a production social platform: embedding-based profile scoring, a live match queue with presence-aware availability, and a timed decision window where both users choose to keep or release the match. Engineered for the race conditions that make live matchmaking hard: simultaneous accepts, mid-queue disconnects, and double-matching, resolved with atomic Redis operations. The engine learns from behavioral signals rather than stated preferences, with anti-bot and spam detection built into the pipeline.
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Cover image for Designed, built, and shipped WeLynk
Designed, built, and shipped WeLynk solo, a production social platform live on web, iOS, and Android. Owned everything end to end: FastAPI services, PostgreSQL/Redis, React and Flutter clients, WebSocket real-time layer, deployment, and observability. The platform combines real-time chat and presence, voice and group calls, matchmaking, 10 first-party games on an in-house SDK, virtual currency, subscriptions, and internal moderation and analytics tooling. 2.1M+ lines of code across Python, TypeScript, Dart, Rust, and Luau. Zero application-caused outages since launch.
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Cover image for Built a real-time multiplayer 3D
Built a real-time multiplayer 3D engine from scratch in Rust (~294K lines): deterministic Rapier3D physics at a fixed 60Hz tick, wgpu PBR rendering to native (Metal/Vulkan/DX12) and WebGPU, and custom netcode over QUIC with delta encoding, client prediction, and rollback reconciliation for 20-player sessions. Games run in a sandboxed Luau VM, safe for untrusted code, identical logic on client and server under a strict determinism contract. One Rust core compiles to web, iOS, Android, and server. Ships with its own simulator, tick-level profiler, and telemetry analyzer.
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Python(3)
Aidan Szwec's avatar
Aidan Szwec
Chicago, USA
Python Data Science | Visualizations & ML
Python Data Science | Visualizations & ML
Cover image for World Happiness - Data Visualization Project
World Happiness - Data Visualization Project
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Cover image for Dealership - Langchain, Webscraper & Smart Used Vehicle Inventor
Dealership - Langchain, Webscraper & Smart Used Vehicle Inventor
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Cover image for Destiny 2 - Langchain Build Recommender AI
Destiny 2 - Langchain Build Recommender AI
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Python(3)
David Yerrington's avatar
David Yerrington
Chicago, USA
AI Agent Architect & Data Science Strategist
AI Agent Architect & Data Science Strategist
Cover image for Custom PDF Processing with AI
Custom PDF Processing with AI
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Cover image for Mail Response Agent + Consulting - AgentDomo.AI
Mail Response Agent + Consulting - AgentDomo.AI
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Cover image for USAID - Instagram Sentiment AI Agent
USAID - Instagram Sentiment AI Agent
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Python(3)
Mo Omer's avatar
Mo Omer
Chicago, USA
I design, build, and scale websites, apps, and AI products!
TOP_INDEPENDENT

Top

I design, build, and scale websites, apps, and AI products!
Cover image for Maximizing Advertising ROI with AWS and Machine Learning: $30MM
Maximizing Advertising ROI with AWS and Machine Learning: $30MM
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Cover image for Technical Article - Introducing Bonsai's New Terraform Provider
Technical Article - Introducing Bonsai's New Terraform Provider
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Cover image for Go API Client for Bonsai.io
Go API Client for Bonsai.io
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Cover image for Terraform Provider for Bonsai.io
Terraform Provider for Bonsai.io
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Python(1)
Ethan Irimiciuc's avatar
Ethan Irimiciuc
Arlington Heights, USA
AI Automation Engineer | Python, OpenAI, Bots & Scraping
New to Contra
AI Automation Engineer | Python, OpenAI, Bots & Scraping
Cover image for Steam Market Bot is an
Steam Market Bot is an automated trading platform for the CS2 skin marketplace. It scans thousands of Steam Community Market listings in real time, detects underpriced items, and surfaces profitable buy opportunities through a clean dashboard. The CS2 skin market moves on volume and speed. Manual traders miss opportunities because prices shift in seconds. This bot solves that by handling the scanning, monitoring, and decision logic continuously. Features: Real-time market scanning across thousands of listings Live dashboard with balance, active orders, scan cycles, and bot status Configurable item filters (float ranges, sticker conditions, price thresholds) Warm-up mode to safely initialize bot sessions without triggering rate limits Live activity log so users can audit every action the bot takes Built with FastAPI, React, TypeScript, Python, Selenium, and the Steam Community Market API. Deployed with a PostgreSQL backend for trade history and analytics. This was a personal project that turned into a real tool. I built it to handle my own CS2 trading and shipped a polished version for others to use.
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Cover image for Flagspill is an anonymous social
Flagspill is an anonymous social platform where users share short takes on relationship and dating situations, then vote them red flag, green flag, or contested "yellow flag." It's Reddit meets a polling app, focused on the moments people overthink and want a second opinion on. Features: Anonymous post and comment system with optimistic vote updates Multi-feed browsing (Hot, New, Top Today, Top Week, All Time) Yellow flag detection for contested posts where the community is split Responsive masonry grid layout that adapts cleanly across devices Real-time engagement metrics on every post Where it gets interesting is the moderation. Flagspill runs a multi-stage moderation pipeline using regex hard rules, heuristic spam and gibberish detection, and GPT-4o-based content review with rate limiting. Every submission goes through this pipeline before hitting the database, keeping the platform safe and useful at scale. Tech stack: React, TypeScript, Tailwind, Supabase for database and auth, OpenAI GPT-4o for moderation, deployed on Vercel. Built and shipped solo. Live at flagspill.com (http://flagspill.com).
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Cover image for Wildlife Quiz Platform for K-12: Enhance Classroom Learning
BioTrack is a wildlife education web platform built to help K-12 teachers create custom animal-themed quizzes, manage classes, and track student progress on biology learning. Teachers can build flashcard sets, assign quizzes to specific classes, and even request new animals to be added to the platform's database. Features: Teacher dashboard with class, student, assignment, and report tracking Custom quiz builder powered by an animal/wildlife database Classroom management with student rosters and assignment delivery Request Animal system for crowdsourcing new content to the platform Authentication and role-based access for teachers and students Built with React and TypeScript on the frontend, FastAPI and Python on the backend, with PostgreSQL for data persistence and a REST API connecting everything. This was a collaborative project I worked on with a team of four as part of a university software engineering course. I handled significant portions of the frontend architecture and API integration, working closely with backend and design teammates on a 12-week build cycle. Shipped as a working app deployed for active classroom users.
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Cover image for MixerAI is a Chrome extension
MixerAI is a Chrome extension that consolidates ChatGPT, Claude, Gemini, and Perplexity into a single dashboard. Most heavy AI users are paying for 2-4 subscriptions and constantly switching tabs to use the right model for the right task. MixerAI fixes that. Features: Unified connection status for all major AI services in one panel Smart subscription tracking so you can see which plans you're on across providers Plan recommendation engine that suggests Free vs Pro vs Max tiers based on your usage patterns Single task input that routes your prompt to the best-suited AI for the job Built with TypeScript, React, Chrome Extensions API, Tailwind, and integrations with OpenAI, Anthropic, Google, and Perplexity APIs. This project came from frustration with my own AI tool sprawl: four tabs open, two paid subscriptions I wasn't fully using, and no system for deciding which model to ask. MixerAI is the tool I built to solve that for myself, and now I'm shipping it for others.
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Python(1)
Syntax Love's avatar
Syntax Love
Chicago, USA
24/7 Emergency Technical Support & Production Issue Solving
24/7 Emergency Technical Support & Production Issue Solving
Cover image for Emergency Response Portfolio
Emergency Response Portfolio
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Cover image for Game Modding Portfolio
Game Modding Portfolio
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Cover image for Game Modding Portfolio
Game Modding Portfolio
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Python(1)
J.D. Smith's avatar
J.D. Smith
Chicago, USA
VC deal partner helping Startups build info sites and MVPs
$1k+
Earned
2x
Hired
9
Followers
BOLT_EXPERT

Expert

BOLT_MENTOR_EXPERT

Mentor

VC deal partner helping Startups build info sites and MVPs
Cover image for Startup Guru
Startup Guru
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Cover image for Bolt Mentor Program
Bolt Mentor Program
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Cover image for Cross Realty Group | Luxury Real Estate
Cross Realty Group | Luxury Real Estate
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Cover image for TokenD
TokenD
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Python(1)