Scientist Work, Jobs in Fitzrovia, Gtl (with Salaries)

Senior/Lead Data Scientist -Fraud
Klarna Bank AB —London
- £81,425 - £116,438 a year
- Full-time
- Computer Science
- AWS
- Machine learning
13d
Data Coordinator (London, Entry-Level)
Medpace, Inc. —London
- Full-time
- Microsoft Word
- English
- Bachelor's degree
- Annual leave
- Work from home
Project Coordinator, Data Monitoring - Entry Level
Medpace, Inc. —London
- Full-time
- Microsoft Powerpoint
- Microsoft Word
- Bachelor's degree
- Annual leave
- Work from home
eClinical Coordinator (London, Entry Level)
Medpace, Inc. —London
- Full-time
- Microsoft Word
- Software troubleshooting
- English
- Annual leave
- Work from home
Project Assistant - Clinical Safety
Medpace, Inc. —London
- Full-time
- English
- Administrative experience
- Organisational skills
- Annual leave
- Work from home
9d
Research Assistant - RNA Therapeutics and Adipose: Tumour Crosstalk in Prostate Cancer
Imperial College London —Hammersmith
- £45,399 - £48,876 a year
- Full-time
- Research
- Master's degree
- University
7d
Assistant Healthcare Scientist
UK Health Security Agency —Colindale
- £29,613 - £30,266 a year
- Part-time
- Computer literacy
- Laboratory experience
- Presentation skills
8d
Research Technician
University College London —London
- £31,904 - £36,433 a year
- Full-time
- Research
- University
- Annual leave
- Employee assistance programme
6d
Graduate Programme 2027: Data Scientist and Analyst
Revolut —London
- £10,800 a month
- Full-time
- Hybrid work
- English
- Maths
- Communication skills
Research Assistant
University College London —London
- Full-time
- Research
- Master's degree
- University
- Annual leave
- Employee assistance programme
6d
Engineering Science Consultant - Life Sciences (Graduate)
Capgemini Sogeti —London
- Hybrid work
- Doctoral degree
- Engineering
- Master's degree
Junior Scientist - Cell Specialist
Phytoform Labs Ltd —Harpenden
- £38,000 - £39,400 a year
- Full-time
- Laboratory experience
- Master's degree
- Organisational skills
- Free parking
Quick apply
Junior Lab Technician
Diffractive Labs —London
- Temporary
- Laboratory experience
- Maintenance
- Bachelor's degree
In Vivo Scientist
Pharmidex Pharmaceutical Services LTD —Hatfield
- Full-time
- Doctoral degree
- Master's degree
- Bachelor's degree
- Free parking
- Referral programme
Quick apply
Medical/Biological Researcher/Scientist - AI Trainer - Freelance - 8-20 hrs/week - Remote
10x Team —London
- £30 - £40 an hour
- Remote
- Research
- AI
- Flexible schedule
Quick apply
Data Science Machine Learning Internship (Summer 2027)
Castleton Commodities International —London
- Full-time
- Analysis skills
- Maths
- Bachelor's degree
Food Technologist
elix sourcing solutions —London
- £39,000 - £40,000 a year
- Monday to Friday
General Interest in working for Quantinuum - London-Cambridge-Oxford
Quantinuum —London
- Full-time
Research Assistant or Associate for the PAiNTS human challenge study
Imperial College London —South Kensington
- £45,399 - £59,484 a year
- Full-time
- Hybrid work
- Doctoral degree
- Laboratory experience
- Research
4d
Product Development Scientist
Mars —Slough
- £43,500 - £54,000 a year
- Full-time
- Bachelor's degree
- Quality control
- In-person
13d

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Senior/Lead Data Scientist -Fraud

Klarna Bank AB -
London

Apply Now

Job details

Full-time
£81,425 - £116,438 a year
13 days ago

Qualifications

Computer Science
AWS
CI/CD pipelines
Machine learning
Machine learning modelling
Mentoring
Physics
Data pipeline
Fraud prevention and detection
Data science
Jenkins

Full job description

What you will do

We are rebuilding our fraud detection systems from the ground up, and we are looking for data scientists who want the full mandate to do it right, from raw data to production model, at a scale that affects hundreds of millions of transactions. Klarna is a big company that still moves like a startup: fast decisions, real ownership, and models that ship. We own the full stack, and expect you to build it with us to enable your use cases. If you have the curiosity to find the right problem, the grit to build the right solution, and the ambition to see it matter, this is the opportunity.

Fraud is one of the most technically demanding problem spaces at Klarna. You will build best-in-class machine learning systems from the ground up, owning the complete pipeline from raw data through feature engineering, model design, training, and real-time production deployment. A central part of this role is converting some of Klarna's existing rules-based fraud systems into sophisticated, model-driven architectures that operate at scale across hundreds of millions of transactions.

You will build infrastructure from scratch, not maintain or extend existing frameworks. Working with engineers, analysts, and commercial stakeholders, you will translate ambiguous business problems into precise technical solutions and bring novel approaches such as graph networks, anomaly detection, and behavioural signals into production where they create real impact.

Who you are

End-to-end ML ownership across the full stack: data engineering, feature development, model design, training, low-latency production deployment, monitoring, and retraining.
Strong instinct for when a model is ready for production and when it is not.
Proven track record of building ML models and pipelines from scratch, not integrating or extending someone else's product or tooling.
Experienced building real-time or near-real-time inference systems; batch pipelines alone are insufficient.
Comfortable with large-scale datasets including hundreds of millions of transactions and high-dimensional feature spaces.
Strong Python and SQL skills with hands-on experience in scikit-learn, LightGBM, Docker, Jenkins, and modern Python packaging.
Self-motivated, fast-moving, and creative. You bring novel solutions where others reach for off-the-shelf tooling.
Communicates precisely across technical and non-technical audiences including senior stakeholders.
Degree in computer science, physics, applied mathematics, astrophysics, automatic control, mathematics, software engineering, electrical engineering, or a related quantitative field.

Awesome to have

Experience building end-to-end ML systems in early-stage startups or small greenfield teams. This is a strong positive signal.
Hands-on production experience with graph neural networks, anomaly detection, or behavioural biometrics, beyond prototyping or fine-tuning.
Familiarity with AWS (SageMaker, Lambda, S3, Athena) and CI/CD practices.
Experience mentoring or technically guiding other data scientists.

Please include a CV in English.

Curious to learn more about Klarna and what it’s like to work here? Explore our career site!

Apply Now

Refine Your Search

scientist jobs in fitzrovia, gtl

Senior/Lead Data Scientist -Fraud

Data Coordinator (London, Entry-Level)

Project Coordinator, Data Monitoring - Entry Level

eClinical Coordinator (London, Entry Level)

Project Assistant - Clinical Safety

Research Assistant - RNA Therapeutics and Adipose: Tumour Crosstalk in Prostate Cancer

Assistant Healthcare Scientist

Research Technician

Graduate Programme 2027: Data Scientist and Analyst

Research Assistant

Engineering Science Consultant - Life Sciences (Graduate)

Junior Scientist - Cell Specialist

Junior Lab Technician

In Vivo Scientist

Medical/Biological Researcher/Scientist - AI Trainer - Freelance - 8-20 hrs/week - Remote

Data Science Machine Learning Internship (Summer 2027)

Food Technologist

General Interest in working for Quantinuum - London-Cambridge-Oxford

Research Assistant or Associate for the PAiNTS human challenge study

Product Development Scientist

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