Ben S.

You need someone who doesn’t just write C++ you need someone who understands how exchanges, clearing systems, and trading platforms actually work from the inside. I’m a Senior Engineer at Deutsche Börse Group, where I build and maintain the real-time market data infrastructure that processes millions of messages per day for one of the world’s largest derivatives exchanges. I’ve spent years deep inside the machinery of institutional trading, feed handlers, protocol gateways, matching engine interfaces, and the kind of systems where microseconds matter and downtime isn’t an option. What I do for clients: I help hedge funds, prop trading firms, brokers, and fintech companies build, fix, or optimize their trading infrastructure, the systems that connect them to exchanges, process market data, execute orders, and keep them compliant. Typical projects I take on: • FIX engine implementation, certification, and connectivity to exchanges (EUREX, CME, LSE, ICE, Nasdaq) • Market data feed handlers, parsing, normalizing, and distributing real-time data at scale • Low-latency C++ systems, shaving microseconds off order routing, reducing jitter, profiling hot paths • Protocol integration, ETI, EOBI, OUCH, ITCH, FIX 4.2/4.4/5.0, SBE, FAST • Trading system architecture, designing the full stack from gateway to risk engine • Migration and modernization of legacy trading platforms Why clients choose me over a general C++ developer: • I work inside a Tier 1 exchange daily. I don’t guess how exchange protocols behave, I know, because I build them. • I’ve worked with systems processing 10M+ messages/day with sub-millisecond latency requirements. • I understand the full lifecycle: connectivity, certification, conformance testing, failover, disaster recovery. • I can speak to your quants, your infrastructure team, AND your compliance people. Tech I work with daily: C++ (modern C++17/20, multithreading, lock-free structures, Linux systems programming), Java/Spring Boot for middle-tier services, FIX/ETI/EOBI/SBE protocols, Kafka and messaging pipelines, Docker/Kubernetes for deployment, GCP/AWS infrastructure. How I work: I prefer focused, high-impact engagements typically 10-20 hours/week alongside my full-time role. I’m based in Frankfurt (CET timezone), responsive on Slack/Teams, and I deliver production-grade code with tests, documentation, and deployment scripts. No hand-holding required. Let’s talk about what you’re building.