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. Every day, you’ll receive apprenticeship, coaching, and exposure that will accelerate your growth in ways you won’t find anywhere else.

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.

General community: As a Software Engineer, you will collaborate with a global network of technologists, designers, and strategists to help clients transform their businesses through innovative digital solutions. In this role, you will work hands‑on with clients across industries to bring their digital ambitions to life. You will develop software products and services from the ground up while coaching and mentoring client teams on engineering best practices, user‑centric design, and Agile values.

You will participate in cross‑functional problem‑solving sessions with client leaders, shaping their digital strategies and delivering solutions that go beyond the product itself. You will collaborate with clients across industries to turn their digital ambitions into reality through hands‑on technical expertise. You will be based in Madrid or Lisbon and will be part of QuantumBlack AI by McKinsey, a multidisciplinary group of software engineers, AI engineers, data scientists,



and technology consultants passionate about creating industry‑shaping products and tools.

You’ll work across diverse industries and technologies, learning something new with every project. With opportunities to contribute to digital strategies, build impactful products, and mentor others, you’ll have the freedom to chart your own path and grow in the areas that excite you most. Bachelors, Master’s or PhD level degree in a discipline such as computer science, machine learning, applied statistics, mathematics, engineering or artificial intelligence. ~2-5+ years of experience developing full‑stack applications by writing code that is readable, testable, maintainable, and scalable. ~ Demonstrated experience working collaboratively with other developers, as well as technical and non‑technical people within software teams. ~ Hands‑on experience and willingness to learn across frontend (TypeScript, React, Angular, Vue, Next.js, Tailwind), backend (Python, Node.js, Java/Spring, C#/.NET), and databases (SQL, NoSQL, vector databases, ETL). ~ Experience with LLM frameworks, prompt orchestration, agent frameworks, MCPs, evaluation frameworks, and cloud platforms (Azure, AWS, GCP), including Docker and CI/CD. ~ Strong focus on automated testing, logging, monitoring, and overall system reliability. ~ Experience working in Agile teams, including active participation in sprint ceremonies. ~ Strong communication skills, both verbal and written, in English and Spanish (requirement for Madrid location), with the ability to adjust your style to suit different perspectives and seniority levels. #

📌 Software Developer - Data & Machine Learning Platform (Madrid)
🏢 QuantumBlack, AI by McKinsey
📍 Madrid