Senior Software Engineer - QuantumBlack, AI by McKinsey

McKinsey & Company; Województwo mazowieckie; On-site; PLN 280,000 - 560,000; Full time

Job summary

McKinsey is seeking a senior software architect to lead architecture design, drive technology decisions, and co-create innovative products with Agile engineering excellence.

Based in one of our global locations, you will mentor client teams, shape technical strategies, and deliver scalable, user‑centric solutions across diverse industries. You will work with QuantumBlack, AI by McKinsey, joining a multidisciplinary group of software and AI engineers and data scientists.

Qualifications

• Bachelor, master’s or PhD in computer science, machine learning, applied statistics, mathematics, engineering or artificial intelligence.
• 7+ years of software development experience with strong full‑stack web app background.
• Experience collaborating with technical and non-technical stakeholders.
• Hands‑on 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 modeling and coaching others to use engineering best practices such as design patterns, customer‑centric design, test‑driven development, code refactoring, code review, and OWASP Top 10 security awareness.
• Experience leading in Agile teams, including coaching and modeling Agile mindsets as part of sprint ceremonies, work definition and building developer capabilities.
• Exceptional time management to meet your responsibilities in a complex and largely autonomous work environment.
• Business level language fluency skills, both verbal and written, in English and the local office language(s).

Responsibilities

• Lead architecture design and drive technology decisions.
• Co-create innovative products and mentor clients to adopt Agile practices and engineering excellence.
• Lead project workstreams and build scalable solutions using Agile methodologies.
• Shape technical strategies and ensure the delivery of impactful, user‑centric solutions.
• Collaborate with client leadership to influence digital strategies and scale engineering cultures.

Skills

Full-stack web

Frontend tech (TS/React)

Backend tech (Python/Node.js/Java/.NET

Databases (SQL/NoSQL/Vector)

Cloud platforms (Azure/AWS/GCP)

LLM frameworks & prompts

CI/CD & Docker

Testing & monitoring

Agile coaching

English proficiency

Education

Bachelor/Master/PhD in CS/ML/Math/Engineering/AI

Tools

Docker

CI/CD pipelines

Vector databases

SQL/NoSQL databases

Next.js/Tailwind

Job description

Do you want to do work that matters, alongside supportive leaders who will help you grow faster than you ever thought possible? Are you a creative problem-solver who is energized by challenges? You’ve come to the right place.

YOUR IMPACT

You will lead architecture design, drive technology decisions, and co‑create innovative products while mentoring clients to adopt Agile practices and engineering excellence. Your work offers hands‑on collaboration, diverse industry exposure, and opportunities to shape solutions and grow as a technology leader. You will lead project workstreams, drive architectural decisions, and build scalable solutions using Agile methodologies.Working closely with client teams, you will co‑create products, foster a culture of engineering excellence, and mentor teams in best practices. Your responsibilities will include shaping technical strategies, making key technology decisions, and ensuring the delivery of impactful, user‑centric solutions. Your work will have a lasting impact beyond the products you build.By collaborating with client leadership, you will influence their digital strategies, help scale their engineering cultures, and enable them to achieve sustainable growth. Each project will expose you to diverse industries and technologies, providing opportunities to learn and grow while shaping the future of technology. You will design and deliver next‑generation products that transform businesses across industries.Based in one of our global locations, you will be part of QuantumBlack, AI by McKinsey, a multidisciplinary group of software engineers, AI engineers, data scientists, and technology consultant passionate about creating industry‑shaping products and tools. Your role offers unparalleled opportunities for growth and innovation.You’ll have a seat at the table with client leaders, the chance to shape product strategies, and the freedom to explore areas of personal interest. Supported by a collaborative and innovative team, you’ll make a lasting impact on clients, industries, and the future of technology.

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, master’s or PhD level degree in a discipline such as: computer science, machine learning, applied statistics, mathematics, engineering or artificial intelligence
• 7+ years of experience in software development, with significant full‑stack web application development experience strongly preferred
• Experience working collaboratively with technical and non‑technical team members and stakeholders
• 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 modeling and coaching others to use engineering best practices such as design patterns, customer‑centric design, test‑driven development, code refactoring, code review, and OWASP Top 10 security awareness
• Experience leading in Agile teams, including coaching and modeling Agile mindsets as part of sprint ceremonies, work definition and building developer capabilities
• Exceptional time management to meet your responsibilities in a complex and largely autonomous work environment
• Business level language fluency skills, both verbal and written, in English and the local office language(s), with the ability to adjust your style to suit different perspectives and seniority levels

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.