Algorithm Engineer at Harrington Starr

Job Description:

Latest job information from Harrington Starr for the position of Algorithm Engineer. If the Algorithm Engineer vacancy in London matches your qualifications, please submit your latest application or CV directly through the updated Jobkos job portal.

Please note that applying for a job may not always be easy, as new candidates must meet certain qualifications and requirements set by the company. We hope the career opportunity at Harrington Starr for the position of Algorithm Engineer below matches your qualifications.

Senior FIX Connectivity & Algorithmic Trading Consultant – Capital Markets (Fintech)

• Day Rate: €600 per day
• IR35: Outside IR35
• Contract: Initial 6 months (extension likely)
• Location: Fully remote – EUR time zones (strong preference for South Africa)

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, sellside experience to get it right.

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

Apply

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Job Info:

• Company: Harrington Starr
• Position: Algorithm Engineer
• Work Location: London
• Country: GB

How to Submit an Application:

After reading and understanding the criteria and minimum qualification requirements explained in the job information Algorithm Engineer at the office London above, immediately complete the job application files such as a job application letter, CV, photocopy of diploma, transcript, and other supplements as explained above. Submit via the Next Page link below.