About the Company

BlueWalker Capital is a proprietary trading firm developing systematic and quantitative trading strategies native to prediction markets.

We log hundreds of millions of trades and order book ticks per day, isolate market pairs from tens of millions of combinations, and continuously monitor for a range of arbitrage opportunities we execute on. It's still early days for us—we are deepening a moat across trading infrastructure, datasets, and modeling.

We trade algorithmically using our own balance sheet, generating daily returns exceeding 1% with the capacity to rotate hundreds of thousands of euros in daily volume.

Our mission is to become the leading hedge fund in this emerging asset class, delivering investment returns while making prediction markets efficient as the world's most accurate source of truth.

Backed by world-class investors

Daniel Howard - Halo Capital

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 Gort - Hummingbird Ventures

Wouter Gort is a Partner at Hummingbird Ventures, where he leads Nomads, the firm's fund-of-funds. Previously, he co-founded Greyhound Capital and led investments in companies such as Revolut, Toss, Brex, N26, and Marqeta. Wouter also seeded a startup hedge fund that was acquired by global 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. Our market data platform is newly built, in production, and would be yours to own outright — from the ingestion path through to the tools research runs on.



You'll work across the full stack of the system to ensure the reliability, speed, and robustness of the data behind every trading decision we make.

Responsibilities

- Own and extend the infrastructure behind our market data: ingestion, storage pipelines, and downstream consumers such as internal APIs, SDKs, and bespoke visualisation tools.
- Make thoughtful, forward-looking architectural decisions, balancing risk, performance, cost, and maintainability. We offer flexibility, not hand-holding.
- Stress-test and strengthen critical systems for robustness and clarity. A dependable existing feature set matters more to us than new features.
- Extend the platform to new venues and asset classes as our research grows.
- Guard data integrity. Market data is perishable and largely unrecoverable — a gap is permanent.

Who we are looking for

Hard Skills

- 2+ years of hands-on production experience in Python.
- Experience with high-throughput streaming ingest, where correctness under failure matters more than raw throughput.
- A background in data engineering, covering ETL, a variety of OLAP/OLTP databases, and S3-compatible object storage.
- Comfortable with Docker and Docker Compose, and with the DevOps needed to provision servers, manage database systems, and set up networking and navigate Linux for our data stack.
- Ability to design and write production-grade systems without LLMs, while being proficient and deeply integrated with AI tools to maximize development velocity.
- A background in statistics, computer science, mathematics, physics, or other quantitative fields.

Soft Skills




- Fluent English.
- Self-starter with intense intellectual curiosity.
- Someone who takes as much satisfaction in making a system unbreakable as in building a new one.

Preferred Skills
- Rust, or another low-level language. Our SDK and performance-critical components are moving in that direction.
- Experience developing mission-critical, high-reliability, realtime systems.
- Familiarity with trading systems and financial markets infrastructure.
- Distributed systems experience (K8s/K3s not required).
- Streaming and message infrastructure such as Kafka, Redpanda, or NATS.
- Experience inheriting and hardening systems you did not write.

What it’s like here

- Fast paced environment.
- We value strong integrity.
- We’re direct and honest with each other.
- 5 days a week, in person. Full immersion.
- Project ownership and autonomy, flat company structure.
- We value people who take initiative and are able to figure things out.

Company culture is informal, non-hierarchical, ambitious, collaborative and entrepreneurial.

Compensation

Competitive compensation, tailored to ability and experience.

Benefits

- Gym Membership
- 5' to Transport & Gym
- Cutting-edge Infra
- Team Offsite
- Flexible Holidays
- Special Events

Press La Vanguardia — "BlueWalker Capital capta un millón de dólares para crecer en mercados de predicción" El Periódico — "La barcelonesa BlueWalker Capital capta 1 millón de dólares del hijo del billonario inglés Alan Howard y del inversor Wouter Gort"

From Spain to the World

Talent is evenly distributed. Opportunity is not. Spain produces world-class technical talent, but the local market rarely provides the opportunities to unlock exponential careers. At BlueWalker Capital, we build for exponential outcomes. Join us as we expand our footprint across general capital markets and put Spain on the map of excellence.

📌 Market Data Engineer - Hedge Fund (Barcelona)
🏢 BlueWalker Capital
📍 Barcelona