ION SME/Application Support Engineer

ION SME

London | Hybrid | Contract

Up to £1000 per day - Inside IR35

We're looking for an experienced End-to-End ION Subject Matter Expert to lead the design, implementation, integration and support of a global ION trading platform within a Front Office Investment Banking environment.

This is a hands-on role requiring deep expertise across the full ION ecosystem, working closely with Front Office users, development teams, infrastructure, vendors and business stakeholders to deliver strategic platform enhancements and maintain a highly available electronic trading environment.

Key Responsibilities

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• Act as the technical SME for the end-to-end ION platform across multiple business areas.
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• Lead the architecture, design and implementation of new ION environments and platform enhancements.
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• Own technical delivery for ION-related projects, upgrades, migrations and strategic initiatives.
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• Design and implement integrations between ION and internal/external trading systems.
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• Support the complete trade life cycle from order capture through execution, confirmations and downstream processing.
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• Provide technical leadership during production releases, upgrades and disaster recovery activities.
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• Troubleshoot complex production issues across Front Office trading applications.
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• Work closely with traders, developers, infrastructure teams and third-party vendors to resolve business-critical issues.
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• Define best practices, standards and operational procedures for the ION platform.
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• Produce High-Level and Low-Level Design documentation, architecture diagrams and technical documentation.
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• Mentor engineers and provide technical leadership across the wider application support and engineering teams.
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Required Experience

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• Extensive experience supporting and delivering the ION Trading Platform within Investment Banking.
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• Strong understanding of Front Office Fixed Income trading environments.
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• Proven experience delivering end-to-end ION implementations and platform integration.
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• Experience with ION architecture, deployment and platform configuration.
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• Strong knowledge of electronic trading connectivity and market infrastructure.
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• Experience integrating ION with internal trading platforms and external market venues.
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• Strong understanding of the complete trade life cycle and Straight Through Processing (STP).
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• Experience leading complex technical projects from design through production.
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• Strong stakeholder management skills across Front Office, Technology and Business teams.
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Technical Skills: ION Trading Platform, ION MMI, ION MDATA, PXE, Trading Tools, VMO/VMQ, RFP Gateway, STP Server, Linux, SQL/Sybase, TCL Scripting, FIX Protocol, Bloomberg, Tradeweb, MarketAxess, BrokerTec, MTS, JIRA, Git