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Direct Market Access (DMA) Specialist - US Markets

Front Office
London (UK)

Role Summary

We are hiring a Direct Market Access (DMA)Specialist to support our US equities (and potentially multi-asset) electronic and high-touch execution activities. This is a front-office, desk-based role aligned with US trading hours, focused on DMA infrastructure, FIX connectivity, algorithmic execution support, and real-time monitoring of order flow. The position also offers the potential to expand into a broader execution /flow-trading remit as responsibilities grow and the business develops.

Key Responsibilities

DMA & Real-Time Execution Support

  • Provide real-time, desk-based support, actively monitoring US electronic order flow throughout the trading session.
  • Ensure continuity and stability of DMA connectivity, routing configurations, and exchange access.
  • Configure and support FIX order, execution, and drop-copy sessions.
  • Diagnose and resolve issues such as rejects, connectivity interruptions, or latency anomalies incoordination with brokers and venues.

OMS/EMS & Platforms

  • Configure and maintain OMS/EMS workflows, routing tables, user profiles, and execution paths.
  • Work with platforms including Bloomberg EMSX/TOMS and Trafix.
  • Support UAT cycles, system upgrades, and production release testing.

Algorithmic Execution

  • Test and validate execution algorithms (VWAP, TWAP, POV, liquidity-seeking).
  • Monitor algorithm performance, venue selection, and routing logic during live trading.
  • Identify and escalate anomalies such as unexpected slippage or кrouting deviations.

High-Touch Execution

  • Handle selected US equity orders requiring manual oversight or execution discretion.
  • Provide intraday liquidity insight, execution strategy considerations, and market colour.
  • Coordinate with brokers, venues, and dark/auction mechanisms to support best execution.

Risk & Controls (in close cooperation with Risk team)

  • Configure and maintain pre-trade risk checks (max order size, price collars, credit limits, restricted lists).
  • Participate in market access testing, exchange certification, and periodic control reviews.
  • Ensure adherence to SEC, FINRA, exchange rules, and FCA compliance standards.

Monitoring & Reporting

  • Investigate and escalate execution anomalies or system irregularities.
  • Work with Technology, brokers, and vendors to resolve issues efficiently.
  • Produce execution metrics, incident reports, and performance analytics.

Qualification & Experience

  • 3–7+ years of experience inDMA, electronic trading support, FIX connectivity, or execution services.
  • Strong understanding of USequities market structure, including Reg NMS, dark pools, routing, andauctions.
  • Proficiency with FIX protocol(4.x) and diagnosing FIX workflow issues.
  • Experience with Bloomberg EMSX/TOMS and Trafix.
  • Ability to analyse FIX logs, routing behaviour, latency patterns, and execution outcomes.
  • Strong Excel skills; Python or SQL is an advantage.
  • Excellent communication skills, attention to detail, and ability to operate independently during US market hours.

How to Apply

To apply, please send your CV and a brief note outlining your relevant experience and interest in the role to jobs-trading@gbmsecurities.com