HFT C++ Engineer

Fionics; New York (NY); On-site; USD 180,000 - 320,000; Full time

Benefits offered by this job

Ownership from day one

Competitive compensation

Small team with high bar

Job summary

Fionics in New York seeks a C++ engineer with 3+ years in low-latency systems at a live HFT or quant shop. You will work on execution engines, market data infrastructure, and full‑stack performance engineering for liveTrading.

Your code will reach production in days, not quarters, as you join a small team with a high bar and real ownership from day one. If you are a strong engineer at a large firm, this is a rare chance to ship fast and drive meaningful performance gains.

Qualifications

• C++ engineer with 3+ years in low-latency systems at a live HFT or quant shop.
• Experience reducing latency, high-performance computing, and trading systems.
• Ability to operate in a small, fast-paced team.

Responsibilities

• Develop execution engines and market data infrastructure.
• Deliver production-ready code quickly with robust tests.
• Collaborate with researchers and traders in the same room.

Skills

C++

Low-latency systems

HFT/quant experience

Job description

For C++ engineers with 3+ years in low-latency systems at a live HFT or quant shop.

If you're a strong engineer at a big firm, you probably know the pattern:

– Inherited systems you can't fundamentally change.

– Three layers between your code and production.

– A queue of approvals before you can ship.

– Comp tied to politics, not output.

This isn't that.

The firm

A proprietary HFT firm in New York. ~40 people. Profitable for over a decade. Built quietly, on purpose. Everything in-house. PnL per person well above industry norm and still growing.

The work

Execution engines, market data infrastructure, full-stack performance engineering on systems that trade live. Trading, research, and engineering in the same room. Your code in production in days, not quarters.

You'll get

Real ownership from day one. A small team with a high bar. Comp highly competitive at every level.