BlueWalker Capital is a proprietary trading firm developing systematic and quantitative trading strategies native to prediction markets.
Its still early days for us—we are deepening a moat across trading infrastructure, datasets, and modeling.
Our mission is to become the leading hedge fund in this emerging asset class, delivering investment returns while making prediction markets efficient as the worlds most accurate source of truth.
Daniel Howard is the Founder and Managing Partner of Halo Capital, a digital assets venture fund associated with Brevan Howard. Previously, he was a Principal at 10T Holdings, a Machine Learning Engineer at Spark Cognition, and a Data Scientist at Verisk. Daniel also spent over seven years in academia across Columbia University's Engineering and Business schools.
Wouter also seeded a startup hedge fund that was acquired by general market maker IMC Trading in 2023.
About the Role We are a small engineering team, which means your responsibilities scale rapidly and your impact is clear and foundational. You would own the execution path end to end:



order submission, fill handling, position tracking, reconciliation, and the risk controls around them.
Python covers services where iteration speed matters most; Rust covers latency-critical and concurrency-heavy components.
Build and maintain risk controls: exposure limits, drawdown monitoring, kill switches, and their alerting.
Make forward-looking architectural decisions, balancing risk, performance, cost, and maintainability. Stress-test and strengthen critical systems for robustness and clarity. Who we are looking for Hard Skills 2+ years of hands-on production experience in Python, including asyncio, WebSocket clients, and event-loop behaviour under sustained load.
Production experience in Rust, with demonstrated work. Async Rust: Tokio, Send/Sync bounds, cancellation safety, and the effect of blocking work on an async runtime.
Experience with systems where state correctness is a primary re

📌 Systems Engineering Engineer (Barcelona)
🏢 BlueWalker Capital
📍 Barcelona