Senior FIX Connectivity & Algorithmic Trading Consultant – Capital Markets (Fintech)
Day Rate: €600 per day
IR35: Outside IR35Contract: Initial 6 months (extension likely)
Location: Fully remote – EUR time zones (strong preference for South Africa)
Intro
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.
The Role
This is a high?impact senior advisory engagement, working directly with trading, quant and technology leadership.You will:
- 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
What We’re Looking For
- 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
- South African capital markets exposure (JSE, local market structure) is a strong advantage
Why This Role
- Direct influence on live trading architecture and execution performance
- High?trust advisory role — you are brought in for judgement, not delivery volume
- Close access to senior trading and quant leadership
- Fully remote with CET / SAST overlap
- Clear scope, urgency and decision?making authority
