Software Engineer II - QuantumBlack Labs

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.

You will be part of Quantum Black Labs and 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.

We hire engineers into multiple product teams (e.g. agentic AI systems, digital twins, advanced analytics platforms). Team placement will depend on your skills and interests.

Our teams in Quantum Black Labs are responsible for designing products that explain complex data landscapes and insights to our users, building frameworks and libraries that enable Data Scientists, Data Engineers, and Machine Learning Engineers to work effectively on large‑scale, complex projects—including open‑sourcing some of these frameworks, such as Kedro and ARK—and developing innovative, industry‑specific AI/ML solutions that embed our distinctive technical approach and business knowledge for enterprise clients.

As a Software Engineer II, you will collaborate with interdisciplinary teams to design and deliver innovative solutions. You’ll continuously enhance your skills, address user needs, and contribute to building impactful, high‑quality products that drive real‑world outcomes.

In this role, you will take initiative in your learning and development. You will actively seek opportunities to grow by participating in training, conferences, and hands‑on projects. With a growing understanding of the investment and return of solutions, you will help create reusable components that accelerate product development across infrastructure, platforms, and services.

Your work will have a real‑world impact by driving innovation and delivering scalable solutions. By collaborating with diverse teams, you will contribute to McKinsey’s shift toward asset‑based consulting, helping to create high‑value tools that address critical client needs and shape industry‑leading outcomes.

You will join our London or Madrid office and collaborate within cross‑functional teams to create and develop innovative tools and products by managing work streams, engaging in discussions, and crafting…