Senior Application Support Engineer – Elite Systematic Trading Firm - Prop Trading - Up to £450k TC

Senior Application Support Engineer – Elite Systematic Trading Firm – Prop Trading – Up to £450k TC – WFH My client, an elite and fast-growing systematic trading firm, is looking for an Application Support Engineer to join a high-impact, London-based team at the cutting edge of global markets. This is a career-defining opportunity to join an engineering-driven firm where technology is core to every decision. You will provide mission-critical support for low-latency trading systems, automate infrastructure and application processes, and collaborate directly with trading, development, and infrastructure teams. You will operate in a high-performance environment that values precision, initiative, and continuous innovation. Key Responsibilities Deliver L1/L2 support for proprietary and third-party trading applications across global markets. Ensure maximum uptime of latency-sensitive trading platforms, proactively identifying and resolving production issues. Automate and enhance support functions using Python, SQL, and monitoring tools like Splunk and Grafana. Collaborate with traders, developers, and network engineers to troubleshoot live issues and optimise trading operations. Build, maintain, and document proactive alerting systems and health checks for internal and external connectivity (e.g., FIX, REST APIs). Drive operational excellence through robust incident management, process improvement, and knowledge-sharing across regions. Play a key role in onboarding new trading desks, products, and exchanges—delivering low-latency infrastructure and reliable integration. Ideal Candidate Profile 5+ years’ experience supporting high-performance trading systems in a Python and Linux-heavy environment. Strong knowledge of the trade lifecycle in one or more asset classes (e.g., FX, Commodities, Equities). Proven expertise in FIX protocol, trading workflows, and exchange connectivity. Skilled in scripting for automation (Python, Bash) and familiar with tools like Ansible and Geneos. Experience with relational databases (Postgres, Sybase, Oracle) and writing performant SQL queries. Knowledge of production-grade monitoring tools (e.g., Grafana, Splunk), alert tuning, and system health validation. Understanding of low-latency infrastructure, colocation environments, and performance tuning (CPU affinity, NUMA). Strong communicator with a sense of urgency and ownership; capable of leading investigations and mentoring junior staff. To apply, please send your CV to moses.lynn@mondrian-alpha.com or respond directly to this advert.