Data Scientist II - QuantumBlack Labs
McKinsey & Company
Data Science
London, UK
Posted on Jan 14, 2026
Data Scientist II - QuantumBlack Labs
Job ID: 104608
Do you want to work on complex and pressing challenges—the kind that bring together curious, ambitious, and determined leaders who strive to become better every day? If this sounds like you, you’ve come to the right place.
Your Impact
You will be part of QuantumBlack Labsand work in a team of software engineers, product managers, data scientists, data engineers and designers to create innovative products and new technologies that accelerate and scale our work in artificial intelligence and machine learning.
Our teams in QuantumBlack Labs are responsible for:
- Designing products that can explain complex data landscapes and insights to our users
- Building frameworks and libraries for Data Scientists, Data Engineers and Machine Learning Engineers to work in large-scale, complex projects. We open-source some of these frameworks, like in the case of Kedro, ARK.
- Building innovative industry-specific AI/ML solutions that embeds our distinctive technical approach and business knowledge for enterprise clients.
As a Data Scientist II, you will create scalable data science solutions, enhance existing assets, and work with diverse datasets to address complex challenges across industries. Collaborating with global, multidisciplinary teams, you'll drive innovation, develop impactful technologies, and grow as a leader in AI and machine learning.
You will work with diverse and complex data sets, develop data science products, and write optimized code to enhance our internal tools. Collaborating with data scientists, engineers, and designers, you will leverage advanced math, statistics, and machine learning to deliver impactful solutions and grow the firm’s capacity to deliver at scale.
Your work will help clients address their most pressing challenges by deploying cutting-edge technology and amplifying impact across industries. You will also contribute to the broader data science community by writing papers, presenting at conferences, and sharing knowledge with colleagues.
You will be based in London or Madrid and collaborate closely with data scientists, data engineers, machine learning engineers, designers, and product managers around the world. Together, you’ll work on interdisciplinary projects to solve complex business challenges across a range of industries. Collaborating with QuantumBlack leadership, client executives, and technical experts, you will lead the development and application of cutting-edge machine learning and AI solutions to drive measurable business impact.
At McKinsey, you’ll grow as a technologist and leader, working in a collaborative, multidisciplinary environment. You’ll push the boundaries of innovation and technology while shaping the future of AI and data science alongside inspiring individuals.
Your Growth
Driving lasting impact and building long-term capabilities with our clients is not easy work. You are the kind of person who thrives in a high performance/high reward culture - doing hard things, picking yourself up when you stumble, and having the resilience to try another way forward.
In return for your drive, determination, and curiosity, we'll provide the resources, mentorship, and opportunities you need to become a stronger leader faster than you ever thought possible. Your colleagues—at all levels—will invest deeply in your development, just as much as they invest in delivering exceptional results for clients. Every day, you'll receive apprenticeship, coaching, and exposure that will accelerate your growth in ways you won’t find anywhere else.
When you join us, you will have:
- Continuous learning: Our learning and apprenticeship culture, backed by structured programs, is all about helping you grow while creating an environment where feedback is clear, actionable, and focused on your development. The real magic happens when you take the input from others to heart and embrace the fast-paced learning experience, owning your journey.
- A voice that matters: From day one, we value your ideas and contributions. You’ll make a tangible impact by offering innovative ideas and practical solutions, all while upholding our unwavering commitment to ethics and integrity. We not only encourage diverse perspectives, but they are critical in driving us toward the best possible outcomes.
- Global community: With colleagues across 65+ countries and over 100 different nationalities, our firm’s diversity fuels creativity and helps us come up with the best solutions for our clients. Plus, you’ll have the opportunity to learn from exceptional colleagues with diverse backgrounds and experiences.
- World-class benefits: On top of a competitive salary (based on your location, experience, and skills), we provide a comprehensive benefits package to enable holistic well-being for you and your family.
Your qualifications and skills
- Bachelors, Masters or PhD level in a discipline such as computer science, machine learning, applied statistics, mathematics, engineering or artificial intelligence
- 2-5+ years of professional experience in applying machine learning and data mining techniques to real problems with copious amounts of data
- Previous experience in NLP or generative AI, including model development or application design and deployment, is highly desirable.
- Programming experience (focus on machine learning): SQL and Python’s Data Science stack are a must; good knowledge of at least one big data framework (Pyspark, Hive, Hadoop) is a plus; R, SPSS, SAS (nice to have); Software Engineering is a plus
- Knowledge in applying machine learning solutions to real problems with complex and/or big amounts of data.
- Ability to prototype statistical analysis and modeling algorithms and apply these algorithms for data driven solutions to problems in new domains
- Experience deploying technology applied to business problems is a plus
- While we advocate for using the right tech for the right task, we often leverage the following technologies: Python, PySpark, the PyData stack, SQL, Airflow, Databricks, our own open-source data pipelining framework called Kedro, Dask/RAPIDS, container technologies such as Docker and Kubernetes, cloud solutions such as AWS, GCP, and Azure, and more
- Exceptional time management to meet your responsibilities in a complex and largely autonomous work environment
- Strong communication skills, both verbal and written, in English and local office language(s), with the ability to adjust your style to suit different perspectives and seniority levels
Please review the additional requirements regarding essential job functions of McKinsey colleagues.
Our unwavering commitment to integrity drives everything we do, guiding us to always act in the best interests of our clients, our people, and the communities we serve.
FOR U.S. APPLICANTS: McKinsey & Company is an Equal Opportunity employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by applicable law.
FOR NON-U.S. APPLICANTS: McKinsey & Company is an Equal Opportunity employer. For additional details regarding our global EEO policy and diversity initiatives, please visit our McKinsey Careers and Diversity & Inclusion sites.
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Job Skill Group - N/A
Job Skill Code - SADS - Data Scientist II
Function - Technology
Industry - High Tech
Post to LinkedIn - Yes
Posted to LinkedIn Date - Mon Jan 12 00:00:00 GMT 2026
LinkedIn Posting City - London
LinkedIn Posting State/Province -
LinkedIn Posting Country - United Kingdom
LinkedIn Job Title - Data Scientist II - QuantumBlack Labs
LinkedIn Function - Information Technology;Product Management
LinkedIn Industry - Computer Software;Information Technology and Services
LinkedIn Seniority Level - Associate
Job Skill Code - SADS - Data Scientist II
Function - Technology
Industry - High Tech
Post to LinkedIn - Yes
Posted to LinkedIn Date - Mon Jan 12 00:00:00 GMT 2026
LinkedIn Posting City - London
LinkedIn Posting State/Province -
LinkedIn Posting Country - United Kingdom
LinkedIn Job Title - Data Scientist II - QuantumBlack Labs
LinkedIn Function - Information Technology;Product Management
LinkedIn Industry - Computer Software;Information Technology and Services
LinkedIn Seniority Level - Associate
