3 open roles

Founding Principal Hardware Engineer

Open Posted on May 13, 2026

At a glance

Pay
$200k – $225k/yr
Type
Full Time
Location
Redwood City, California
Posted
May 13, 2026
Visa sponsorship
SometimesFrom recent H-1B filings
Company size
Startup (1-50)
Industry
Finance/FinTech

About the role

What you’ll do

As founding principal hardware engineer, you will lead the design and in-production implementation of an exchange and co-located trading facility on a single silicon device. You will lead development of PAX core technology and set future design directions.

PAX ultra low-latency in-silicon matching engine

PAX is building the world's first exchange and co-located trading facility on a chip. We will go-to-market using AWS F2 FPGA instances and follow-on with an ASIC design that combines network aggregation with exchange functionality.

PAX provides the fastest tick-to-trade and market data publication in the world, across all exchanges (e.g. faster than NYSE, Deutsche Börse, etc.).

Exchange integrated high frequency trading logic

The PAX λ API provides traders with on-chip exchange integrated HFT decision logic. Using the λ API, traders can make markets or take arbitrage opportunities. The λ API enables traders to respond to market events the very instant the information is registered in the exchange matching engine.

PAX business model

PAX sells access to its ultra-low latency λ API and offers trading otherwise for free. Existing exchanges typically offer rebates for liquidity providers ("makers") and charge fees to liquidity takers (the "maker/taker" fee structure). At PAX when λ and non-λ orders pair together, the free-tier order is given a cash rebate regardless of whether their order was characterized as making or taking. PAX is the first exchange to offer zero-fee trading and rebates for both making and taking.

Deep dives on PAX market structure & technology

  • On-exchange trading incentives with inherent price competition.
  • PAX rebates & fees.
  • PAX λ API.

Relevant background

Candidates with experience in high frequency trading (HFT) or at an exchange are encouraged to apply.

Skills

SystemVerilog

FPGA or ASIC design experience

Rust and/or C++

HFT

Protobuf

Curiosity and ability to learn

Passion for trading and markets

About PAX Markets

PAX Markets
Finance/FinTech · Startup (1-50)
YC Backed 3 open roles

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