Millennium
Market Connectivity Developer – External Onboarding
$100K–$175K
New York, New York · On-site · Full-time · Posted Sep 10, 2026
- Experience
- 5+ years of Java development; 3+ years of C++ development; 5+ years within a financial institution.
About the job
Leads onboarding of external trading teams and develops and supports front-office market connectivity and trading solutions across asset classes and regions.
What you'll do
- Integrate third-party trading systems into the Millennium ecosystem and maintain connectivity solutions.
- Partner with brokers, exchanges, ECNs, and platform providers to deliver reliable integrations.
- Troubleshoot complex production issues and provide Level 3 trading-systems support.
What they ask for
- 5+ years of Java development experience, including multithreaded application development; 3+ years of C++ development experience.
- 5+ years of experience within a financial institution.
- Strong knowledge of FIX protocols, including FIX 4.2 through FIX 5.0.
- Extensive Linux development experience; working knowledge of TCP/IP, UDP, and multicast; understanding of object-oriented programming and market structure across equities, futures, options, and FX.
Nice to have
- Knowledge of binary trading protocols.
Pay
$100,000 to $175,000 USD base salary
Tools
Java, C++, FIX 4.2, FIX 5.0, Linux, TCP/IP, UDP, multicast
Model-written summary · the original posting is authoritative