Machine Learning and Quant Engineer - London
toggleai· Machine Learning & AI
About this role
You think in time series, signals, and regimes.
You care about insight quality, not academic purity.
You want your models tested by markets, not papers.
If you dislike messy data and real-world constraints, this is not your role.
The Role, In Plain English
You will build quantitative and ML-driven insight systems using structured time series data.
This role exists to turn raw financial data into actionable investor signals.
You will work closely with engineers to productionize quant logic.
What You’ll Be Responsible For
- Develop models using structured financial time series
- Build insight generation and scenario analysis pipelines
- Collaborate with backend engineers to deploy models in production
- Evaluate signals based on real investor outcomes
- Improve attribution and explainability
What “Good” Looks Like in This Role
After 3 months:
Shipping signals used internally.
After 6 months:
Signals used by customers.
After 12 months:
You shape how quant insights are built at Reflexivity.
Who You Are (Must-Haves)
- 5 plus years experience in quant, ML, or financial modeling
- Strong Python skills
- Startup experience on core systems
- Investment domain knowledge
- AI-assisted coding experience
Nice-to-Haves (Not Deal Breakers)
- Prior buy-side or sell-side experience
- Experience with alternative data
How We Work
- In-office team with high trust and high ownership
- Direct communication, minimal process, strong opinions backed by data
- Engineers are expected to think about product impact, not just code
- We move fast when it matters and slow down when correctness matters more
Why This Role Is Worth Your Time
- Direct influence on how professional investors make decisions
- Hard problems at the edge of AI, data, and finance
- Real ownership and technical autonomy
- Senior peers who care about quality and outcomes
Compensation & Practicalities
- Base salary: £110,000 to £200,000 depending on experience
- Equity included
- In-office role based in London
- No agency candidates
Salary Range
£110,000—£200,000 GBP
Frequently Asked Questions
Is the salary disclosed for the Machine Learning and Quant Engineer - London position at toggleai?
The salary for this Machine Learning and Quant Engineer - London role at toggleai is not publicly listed. Click "Apply Now" to learn more about the compensation package on their official careers page.
Where is the Machine Learning and Quant Engineer - London position at toggleai located?
This Machine Learning and Quant Engineer - London role at toggleai is based in London. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Which team or department does the Machine Learning and Quant Engineer - London at toggleai belong to?
This Machine Learning and Quant Engineer - London position is part of the Machine Learning & AI department at toggleai. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Machine Learning and Quant Engineer - London position at toggleai?
Click the "Apply Now" button on this page. You will be redirected to toggleai's official application portal hosted on greenhouse where you can submit your application directly.
When was the Machine Learning and Quant Engineer - London job at toggleai posted?
This Machine Learning and Quant Engineer - London position at toggleai was posted on Jan 12, 2026. Apply as soon as possible — early applications are often reviewed first.
Machine Learning and Quant Engineer - London
toggleai
You'll be redirected to toggleai's official application page on Greenhouse.