At a Glance
- Tasks: Lead the migration of FIX adapters and design market-making algorithms.
- Company: Established fintech firm modernising its trading technology.
- Benefits: Competitive day rate, fully remote work, and high-impact advisory role.
- Other info: Work closely with senior trading and quant leadership in a dynamic environment.
- Why this job: Make a real difference in live trading architecture and performance.
- Qualifications: Deep sell-side experience and expertise in FIX connectivity and low-latency systems.
The predicted salary is between 48000 - 60000 € per year.
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
- 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
To apply – click the link or email for a faster response
Algorithm Engineer in London employer: Harrington Starr
As a leading player in the capital markets sector, this company offers an exceptional work environment for Algorithm Engineers, particularly those based in South Africa. With a fully remote setup, employees enjoy the flexibility to work from anywhere while engaging in high-impact projects that directly influence trading architecture and performance. The culture fosters collaboration with senior leadership, providing ample opportunities for professional growth and the chance to make significant contributions to cutting-edge trading technology.
StudySmarter Expert Advice🤫
We think this is how you could land Algorithm Engineer in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the fintech and capital markets space. Attend virtual meetups or webinars where you can chat with industry folks. You never know who might have the inside scoop on job openings!
✨Tip Number 2
Show off your expertise! Create a portfolio or a personal website showcasing your projects, especially those related to FIX connectivity and algorithm design. This gives potential employers a taste of what you can bring to the table.
✨Tip Number 3
Prepare for interviews by brushing up on your technical skills. Be ready to discuss low-latency systems and market-making algorithms in detail. Practise explaining complex concepts in simple terms, as you'll need to communicate effectively with both tech and trading teams.
✨Tip Number 4
Don't forget to apply through our website! It’s the quickest way to get your application noticed. Plus, we love seeing candidates who take the initiative to connect directly with us.
We think you need these skills to ace Algorithm Engineer in London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV is tailored to highlight your deep sell-side experience and hands-on background with FIX connectivity. We want to see how your skills align with the role, so don’t be shy about showcasing relevant projects!
Craft a Compelling Cover Letter:Your cover letter is your chance to shine! Use it to explain why you’re the perfect fit for this high-impact advisory role. We love seeing your personality come through, so keep it engaging and relevant to the job description.
Showcase Your Technical Expertise:When detailing your experience, focus on your low-latency systems expertise and any specific algorithms you've designed. We’re looking for someone who can influence trading architecture, so make sure to highlight your achievements in this area.
Apply Through Our Website:For a smoother application process, we encourage you to apply through our website. It’s the best way to ensure your application gets the attention it deserves, and we can’t wait to see what you bring to the table!
How to prepare for a job interview at Harrington Starr
✨Know Your FIX Inside Out
Make sure you brush up on your knowledge of FIX connectivity, especially ULLink and Onix FIX. Be prepared to discuss specific challenges you've faced in previous roles and how you tackled them. This will show that you have the hands-on experience they’re looking for.
✨Showcase Your Algorithm Design Skills
Be ready to talk about your experience designing market-making and hedging algorithms. Bring examples of your work and be prepared to explain your thought process. They want to see how you approach algorithm design and performance validation.
✨Demonstrate Low-Latency Expertise
Since this role focuses on low-latency systems, make sure you can discuss Java, GC tuning, and memory management confidently. Share any specific instances where you optimised latency in your previous projects, as this will highlight your technical prowess.
✨Engage with Front-Office Stakeholders
Prepare to discuss how you’ve worked with front-office teams in the past. They’ll want to know how you align technology with trading intent, so think of examples where your input directly influenced trading strategies or outcomes.
