Senior C++ Engineer - Core Systems

Fionics; New York (NY); On-site; USD 250,000 - 380,000; Full time

Job summary

Fionics, a crypto-native market maker, is seeking a senior C++ engineer to anchor and lead the core systems group in New York. This role places you at the center of high-performance, low-latency infrastructure across multiple venues, with the rest of engineering looking to you for technical direction.

You will mentor engineers, shape architecture, and drive delivery of critical systems while staying hands-on in code.

Qualifications

• 7-12+ years in C++ from a tier-1 HFT or prop firm
• Deep low-latency core systems experience
• Leads and mentors while coding daily

Responsibilities

• Lead the core systems group with a focus on high-performance, low-latency infrastructure
• Mentor and guide engineers while staying hands-on in C++ code
• Set technical standards and influence architecture and delivery across the team

Skills

7-12+ years in C++

Low-latency core systems

Leadership & mentorship in code

Job description

A crypto-native market maker running systematic strategies across dozens of venues, on and off chain. They're hiring a senior C++ engineer to anchor and lead the core systems group in New York. This is the person the rest of engineering looks to.

Why it's worth a look

• A leadership seat on the systems a market maker lives or dies on. You set the technical standard for the core group.
• Real influence. The team is young and strong and needs a senior hand to lead it. You shape how things get built, not just keep them running.
• Heavy investment in high-performance, low-latency infrastructure. Serious engineering across dozens of markets.
• Peers out of top traditional finance firms. Research-first, well capitalised, regulated and maturing fast.

What we're looking for

• 7 to 12+ years in C++ from a tier-1 HFT or prop firm
• Deep low-latency core systems experience
• Someone who leads and mentors while still in the code every day

The bar is high. This is a seat for a top systems engineer who wants to lead.

Comp

Comp is not the constraint for the right person. They can also be patient on notice periods and non-competes.