Arthur A.

Most trading strategies fail in the gap between backtest and live trading - killed by overfitting, lookahead bias, survivorship bias, unrealistic fill assumptions, or fragile infrastructure. I make sure yours doesn't. I'm a quant developer and mathematician. I've been building trading systems professionally since 2019. 𝗛𝗢𝗪 𝗜 𝗖𝗔𝗡 𝗛𝗘𝗟𝗣 𝟭. 𝗦𝘁𝗿𝗮𝘁𝗲𝗴𝘆 𝗩𝗮𝗹𝗶𝗱𝗮𝘁𝗶𝗼𝗻 Independent audit of your strategy or codebase - overfitting analysis, bias detection, data-quality checks, realistic bid/ask fills and cost/slippage modeling on high-resolution data, walk-forward and out-of-sample validation. You get a written report you can act on. 𝟮. 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 & 𝗟𝗶𝘃𝗲 𝗢𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝘀 Live deployment, server setup, maintenance and monitoring, broker integration (e.g. IBKR), alerting, and incident handling. Available as one-off setup or ongoing retainer. 𝟯. 𝗖𝘂𝘀𝘁𝗼𝗺 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 & 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀 When off-the-shelf tools aren't enough: fully custom backtesting and trading platforms built for your specific needs - event-driven architectures, high-throughput streaming data processing, portfolio optimization, custom indicators, factors, and market scanners across equities, futures, options, crypto and FX. 𝗕𝗔𝗖𝗞𝗚𝗥𝗢𝗨𝗡𝗗 M.Sc. in Mathematics. 3+ years as a data engineer in regulatory reporting for major financial institutions. Full-time quant developer and official QuantConnect Integration Partner. I have been trading my own capital since 2013. 𝗪𝗢𝗥𝗞𝗜𝗡𝗚 𝗧𝗢𝗚𝗘𝗧𝗛𝗘𝗥 1. Plan: Message me and describe what you need. I'll reply with an honest assessment and a rough estimate, followed by a written scope with milestones - fixed price or hourly, whichever fits the project. NDA on request; IP remains yours. 2. Build and test: Nothing trades real money before it has passed backtest and paper trading. 3. Go live and support: Deployment on your server and broker account, documented code, and optional ongoing technical support and maintenance. 𝗙𝗟𝗔𝗚𝗦𝗛𝗜𝗣 𝗣𝗥𝗢𝗝𝗘𝗖𝗧 For a client, I designed and built a complete trading platform from scratch, from the data pipeline to the operator dashboard. It now runs their live trading on IBKR. - One engine for backtests and live trading - Safety checks before every order and monitoring for day-to-day operation 𝗧𝗘𝗖𝗛 Python, Rust, QuantConnect/LEAN, Interactive Brokers (IBKR), Docker, Linux, Cloudflare, PostgreSQL.