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Harrington Starr Logo Harrington Starr · IT - Software Development

Electronic Trading Architect

United Kingdom, Amsterdam 600.00 EUR / Day · Job Posted May 27, 2026
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Job Description

This engagement sits at the sharp end of institutional trading technology. The client is a well-established capital markets participant undergoing a critical modernisation of its electronic trading stack, with a specific focus on FIX connectivity, low-latency execution and market-making infrastructure. They are mid-way through a multi-phase transformation programme, replacing legacy FIX adapters and execution logic with a modern, high-performance Onix FIX-based architecture. This role exists because the work is business-critical — and they need senior, sell-side experience to get it right. This is not a delivery-heavy build role. It's an advisory-led, high-judgement contract where your experience will directly shape architecture, trading outcomes and platform direction.

Job Responsibility

  • Own the end-to-end FIX adapter migration strategy from legacy ULLink into Onix FIX
  • Define architecture and execution logic for market-making, hedging and risk algorithms
  • Act as the authority on FIX connectivity, latency optimisation and order routing
  • Influence how trading engines are structured, benchmarked and deployed
  • Set standards for algorithm design, testing and performance validation
  • Work directly with front-office stakeholders to align technology with trading intent
  • Provide architectural direction without needing internal sign-off or escalation

Requirements

  • Deep sell-side experience in electronic trading infrastructure
  • Strong hands-on background with FIX connectivity (ULLink, Onix FIX or equivalent)
  • Proven experience designing market-making and hedging algorithms
  • Low-latency systems expertise (Java, GC tuning, memory management, threading)
  • Ability to operate autonomously in senior advisory environments
  • Comfortable presenting technical decisions to trading and senior stakeholders

Nice to have

South African capital markets exposure (JSE, local market structure)

What we offer

  • Direct influence on live trading architecture and execution performance
  • High-trust advisory role
  • Close access to senior trading and quant leadership
  • Fully remote with CET / SAST overlap
  • Clear scope, urgency and decision-making authority
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