Application Support Engineer

Location: London (On-site, 5 days per week) Role Overview Talan is seeking an experienced Application Support Engineer to join a high-performing global team supporting the eTrading environment for a leading investment banking client. Operating within a Production & Application Support function, this role sits at the heart of front-office trading technology, ensuring the stability, performance, and continuous improvement of critical electronic trading platforms. You will work in a complex, low-latency environment supporting high-volume trading flows, interacting closely with trading desks, development teams, and infrastructure specialists across a global follow-the-sun support model. Key Responsibilities - Oversee day-to-day production support activities, including monitoring, incident management, and capacity planning - Act as a key point of contact for issue resolution, liaising with traders, developers, infrastructure teams, and external vendors - Take ownership of assigned applications and platforms, developing deep technical expertise - Support and enhance electronic trading systems, including pricing engines, algorithmic trading components, and STP workflows - Manage connectivity to external trading venues (e.g. exchanges, ECNs, market data providers) - Contribute to system design improvements, focusing on resilience, scalability, and performance optimisation - Coordinate release and change management activities, ensuring robust deployment processes - Participate in a shift-based rota (7am–6pm coverage) and on-call support, including occasional weekend work - Collaborate with global teams across Europe, North America, and Asia within a follow-the-sun support model - Continuously improve documentation, monitoring, and operational processes Required Skills & Experience - Strong experience in Application Support within electronic trading or capital markets environments - Solid expertise across Linux and Windows server environments - Experienced within Wintel Engineering - Good understanding of market connectivity, networking, and infrastructure (firewalls, multicast, latency considerations) - Ability to analyse system performance across CPU, memory, network, and messaging layers - Proficiency in scripting and automation (e.g. Python, Shell, PowerShell, SQL) - Experience with CI/CD and deployment tools (e.g. Jenkins, Ansible, Artifactory) - Familiarity with application stacks involving Java, C++, or .NET - Strong stakeholder engagement skills with the ability to operate in a front-office facing role - Proven ability to manage incidents and deliver improvements in high-pressure environments Desirable Skills - Experience with ION trading platforms or similar vendor systems - Knowledge of multicast messaging and low-latency trading architectures - Monitoring tools such as Geneos or Zabbix - Experience with Splunk or similar log analytics platforms - OS performance tuning and optimisation