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

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