Quant jobs / Millennium

Quantitative Developer, C++ – Low-Latency Systems

A C++ role building the real-time signal engine for a new systematic equities pod, connecting a Python research layer to production. The developer shapes the stack from the outset.

What you’d work on

Our reading of the posting: what a new hire in this role would most likely spend their first months on.

Build the C++ engine for features, signals and position tracking
Bridge the C++ hot path with the Python and Polars research layer
Publish signals into the firm's shared execution and market data platforms
Add real-time risk checks, logging and alerting
Build backtesting and exchange simulation tools
Profile and tune latency

What they ask for

Required

3+ years of high-performance C++ on Linux
Event-driven low-latency design
Python with Polars, pandas, NumPy
Apache Arrow and columnar formats
Network programming and Linux internals
Concurrency, data structures, algorithms
Git, CI/CD, unit tests
Market data feed consumption

Preferred

Systematic equities trading systems
SIMD, cache-friendly design, memory-mapped I/O
Rust
kdb+/q
Equity microstructure and execution algorithms
DuckDB or Arrow Flight
AWS and containers

Education: Bachelor's or Master's in computer science, maths, physics, engineering or similar
Experience: 3+ years of C++ server-side development
Languages and tools: C++
Python
Rust
kdb+/q
Markets: equities

How to prepare

Build a C++ feature calculator reading Arrow data
Write a lock-free handoff between threads and measure latency
Create an exchange simulator to replay a trading day
Learn equity order types and auction mechanics

What to study

The HFT Quant Developer roadmap sets out the stages for this kind of role, with free resources for each.

Open the roadmap

Apply

Read the full posting on Millennium’s site before applying: requirements, location and pay can change after we check them.

View the posting on Millennium’s site ↗

SelfMadeQuant wrote this summary from the employer’s public posting, last checked 6 November 2026. SelfMadeQuant isn’t affiliated with Millennium and doesn’t handle applications.