Senior Machine Learning Engineer

The Voleon Group; Greater London; On-site; GBP 90,000 - 150,000; Full time

Job summary

The Voleon Group is seeking a Senior Machine Learning Engineer to join our Research team in London. You will translate research ideas into production-grade code, build data pipelines and modeling infrastructure, and contribute to scalable, high-performance ML systems driving our quantitative trading strategies.

Working at the intersection of Computer Science, Mathematics and Statistics, you will collaborate with PhD researchers, ensure correctness and reproducibility, and lead components from

Qualifications

• Bachelor's degree in a quantitative field (CS, applied math, statistics) or related.
• 5+ years of professional software engineering experience with strong CS fundamentals.
• Demonstrated mathematical maturity in statistics, linear algebra, optimization, and probability.
• Deep proficiency in Python; experience with R and/or C/C++ is a plus.
• Extensive experience with NumPy, Pandas, SciPy, scikit-learn, PyTorch, TensorFlow or similar libraries.
• Proven experience building or maintaining ML systems in a distributed computing environment.
• Proficiency developing in a Linux environment with focus on performance and reproducibility.
• Excellent communication skills and ability to collaborate with researchers.

Responsibilities

• Partner with PhD researchers to design, implement, and productize ML models for quantitative trading strategies.
• Develop and maintain data pipelines including ingestion, feature engineering, validation, and monitoring.
• Translate research prototypes into production-grade, well-tested code.
• Build extensible tools and frameworks to accelerate model development and experimentation.
• Lead projects from requirements through delivery with a focus on long-term maintainability.
• Coordinate deployment efforts and guide junior engineers and researchers.
• Foster engineering consistency, standards, and best practices within Research.

Skills

Python

Data pipelines

Distributed computing

Linux

Numerical libraries

Mathematics maturity

Communication

Education

Bachelor's degree in CS/Applied Math/Statistics

Tools

NumPy

Pandas

SciPy

scikit-learn

PyTorch

TensorFlow

Job description

Voleon is a technology company that applies state-of-the-art AI and machine learning techniques to real-world problems in finance. For nearly two decades, we have led our industry and worked at the frontier of applying AI/ML to investment management. We have become a multibillion-dollar asset manager, and we have ambitious goals for the future.

Your colleagues will include internationally recognized experts in artificial intelligence and machine learning research as well as highly experienced finance and technology professionals. In addition to our enriching and collegial working environment, we offer highly competitive compensation and benefits packages, technology talks by our experts, a beautiful modern office, daily catered lunches, and more.

As a Senior Machine Learning Engineer on one of Voleon's Research teams, you will partner directly with research staff to advance our quantitative trading strategies. You will translate novel research ideas into production-quality code, build and maintain the data pipelines and modeling infrastructure that underpin our strategies, and apply your own strong mathematical intuition to solve open-ended technical challenges.

This role lives at the boundary of research and engineering. You will be expected to understand the statistical and mathematical concepts your research partners work with, contribute meaningfully to technical discussions about model design and evaluation, and ensure that the resulting systems are performant, reliable, and maintainable. You will work at the intersection of Computer Science, Mathematics, and Statistics - building high-performance tools that enable world-class research while maintaining a high engineering standard.

Responsibilities

• Partner with PhD researchers to design, implement, and productize machine learning models that drive quantitative trading strategies

• Develop and maintain complex data pipelines, including data ingestion, feature engineering, validation, and quality monitoring

• Translate research prototypes and novel ideas into performant, well-tested, production-ready code

• Build extensible tools and frameworks that accelerate the model development and experimentation lifecycle

• Supervise, understand, and remediate subtle data quality issues across both research and production environments

• Proactively lead projects from requirements through delivery, making autonomous decisions about scope, dependencies, and trade-offs, with an emphasis on long-term maintainability

• Coordinate and contribute to deployment efforts while guiding junior engineers and researchers; align with research and engineering stakeholders on ownership, execution, and prioritization

• Foster engineering consistency, standards, and best practices within Research

Requirements

• Bachelor's degree (or higher) in Computer Science, Applied Mathematics, Statistics, or a related quantitative field

• 5+ years of professional software engineering experience, with strong CS fundamentals (data structures, algorithms, systems design)

• Demonstrated mathematical maturity - comfort with the concepts and notation used in statistics, linear algebra, optimization, and probability

• Deep proficiency in Python; experience with R and/or C/C++ is a strong plus

• Extensive experience with numerical and data science libraries (e.g., NumPy, Pandas, SciPy, scikit-learn, PyTorch, TensorFlow, or similar)

• Proven experience building or maintaining machine learning systems in a distributed computing environment

• Proficiency developing in a Linux environment with attention to performance, correctness, and reproducibility

• Exceptional attention to detail, particularly when working with imperfect or heterogeneous data

• Strong verbal and written communication skills, and the ability to collaborate effectively with researchers whose primary expertise is not software engineering

Preferred Qualifications

• Experience with experiment management, model evaluation pipelines, or ML workflow orchestration

• Familiarity with modern ML/AI infrastructure patterns (model serving, feature stores, distributed training)

• Experience with performance profiling and optimization of numerical or modeling code

• Prior exposure to financial data, time-series analysis, or quantitative research environments

"Friends of Voleon" Candidate Referral Program

If you have a great candidate in mind for this role and would like to have the potential to earn $15,000 if your referred candidate is successfully hired and employed by The Voleon Group, please use this form to submit your referral. For more details regarding eligibility, terms and conditions please make sure to review the Voleon Referral Bonus Program.

Equal Opportunity Employer

The Voleon Group is an Equal Opportunity employer. Applicants are considered without regard to race, color, religion, creed, national origin, age, sex, gender, marital status, sexual orientation and identity, genetic information, veteran status, citizenship, or any other factors prohibited by local, state, or federal law.