Senior C++ Engineer - Core Systems

Fionics; New York (NY); On-site; USD 200,000 - 350,000; 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. You will shape the architecture, set technical standards, and mentor the team while contributing code daily.

The role demands 7–12+ years in C++ at a tier-1 HFT or prop shop, deep low-latency experience, and the ability to drive high-performance infrastructure across dozens of venues.

Qualifications

• 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

Responsibilities

• Anchor and lead the core systems group in New York
• Set technical standards for the group and drive architecture decisions
• Mentor teammates while contributing hands-on code

Skills

C++

Low-latency

Leadership

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.