Software Engineer - Trading System Developer (2026)

XTX Markets•New York, NY

2d•Hybrid

About The Position

XTX Markets is a leading algorithmic trading firm that utilizes advanced machine learning technology to generate price forecasts across a wide range of financial instruments. The firm trades significant volumes daily and employs over 250 people across multiple global offices. Technology is central to XTX Markets' business, with a focus on leveraging talent, modern computational techniques, and extensive research infrastructure, including a large GPU research cluster and a data center in Finland. The company culture emphasizes teamwork, open collaboration, and a non-hierarchical environment where excellence is pursued in all endeavors. The OTC Trading Development team is seeking an experienced developer to focus on trading system development, specifically for ETF trading, with potential involvement in other asset classes like Equities, FX, and Crypto. This role is the first hire for the team in New York and requires close collaboration with stakeholders in NYC and OTC developers in London. There are no out-of-hours support responsibilities, but occasional travel to London may be required. The technology stack is primarily Kotlin, with some C++, and older codebases in Python or Java. It involves high-performance trading venue integrations, fair value generation, trading algorithms, risk controls, and real-time UIs, catering to strict latency and throughput requirements.

Requirements

Experienced coder with a solid understanding of Computer Science fundamentals.
Several years of experience working in Kotlin or other object-oriented languages like Java, C++, or C#.
Knows how to build technology quickly and safely using a variety of testing methods.
Prioritizes correctness over style preferences in code reviews.
Experience in systems with requirements of microseconds per request or gigabits per second per thread.

Nice To Haves

A well-founded understanding of ETFs.
Any domain knowledge, experience, or evidence of interest within finance.

Responsibilities

Architects, implements and maintains a diverse set of trading systems, with an immediate focus on ETFs, but also spanning prop trading on venue and OTC liquidity provision platforms across Equities, FX and Crypto.
Receives reference implementations of models from quants, hard control requirements from Risk and Compliance, and system ergonomics requests from Trading Analysts, often working closely with those teams to find the best direction.
Works autonomously to maximize safety and velocity in building and maintaining multiple trading systems.
Collaborates closely with stakeholders to the system in NYC (e.g., Business Development) and with OTC's developers in London.
Implements high-performance trading venue integrations, fair value generation, trading algorithms, risk controls, and real-time UIs based on business requirements.