Senior Python Engineer for Prediction Market Trading System (Kalshi/Polymarket)

**Real experience only. AI-generated proposals will be skipped.** We are looking for a senior Python engineer to help continue development and stabilization of an existing prediction market trading platform. The system integrates market data, EV calculations, pricing feeds, and trading workflows. We need someone experienced with backend systems, APIs, and financial/trading-related infrastructure who can quickly understand an existing codebase and make focused improvements. Responsibilities: * Review and understand an existing Python trading codebase * Validate EV calculations and pricing logic * Debug API integrations and data pipelines * Improve reliability, testing, and monitoring * Implement small, focused fixes through Git-based workflow Required Skills: * Strong Python backend development experience * Experience with REST APIs and WebSockets * Experience working with trading systems, exchanges, or financial data * Strong debugging skills in existing codebases * Git workflow experience (branches, PRs, code reviews) Nice to Have: * Kalshi API experience * Polymarket API experience * Sports betting or odds data experience * Market-making, arbitrage, or automated trading experience * Experience with real-time data systems This is an ongoing opportunity for the right engineer. We are looking for someone who can work independently, communicate clearly, and make careful improvements without unnecessary rewrites. Please include examples of similar trading, API, or real-time data projects you have worked on.