Trading Systems Engineer — Live Markets & Low Latency

Posley Company Limited

Hong Kong

On-site

HKD 600,000 - 900,000

Full time

14 days+

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Job summary

Posley Company Limited is a quantitative investment firm focused on opportunities across traditional and alternative markets. We study how price, funding, liquidity, market structure and execution interact across markets and build systematic trading strategies around those opportunities.

We are seeking a strong software engineer to help build and improve our trading and execution infrastructure. You will work on live-market systems including execution engines, exchange connectivity, position and

Qualifications

Strong software engineering fundamentals.
Experience building reliable backend or distributed systems.
Strong attention to detail and a high standard for correctness.
Able to reason about asynchronous systems, state and failure scenarios.
Comfortable taking ownership without needing detailed instructions.
Genuine interest in trading, markets or quantitative systems.
Able to use AI coding agents effectively while critically reviewing and validating production-critical code.

Responsibilities

Develop exchange connectivity through WebSocket / REST APIs.
Improve order, position and account state management.
Handle execution edge cases, failures, retries and reconciliation.
Build monitoring and safeguards for live trading systems.
Improve latency, reliability and operational resilience.
Investigate discrepancies in positions, balances, fills, fees and P&L.
Support deployment, cloud infrastructure and DevOps where needed.
Work directly with quantitative researchers to bring strategies into production.
Scope evolves; own between research, trading and infrastructure.