Senior Python Developer

At BBH, Partnership is more than a form of ownership—it's our approach to business and relationships.  We know that supporting your professional and personal goals is the best way to help our clients and advance our business. We take that responsibility seriously. With a 200-year legacy and a shared passion for what's next, this is the right place to build a fulfilling career.

Location: Kraków

Hybrid model 3 days per week in the office /2 days for a parent of a child up to 4 years old

Join us as a Senior Python Developer.

Some of your key responsibilities include:  

• Manage and enhance an existing suite of backend applications built across diverse Python frameworks and technology stacks.

• Provide technical guidance and mentorship to junior engineers, fostering a culture of clean code, collaboration, and continuous improvement.

• Collaborate with architects, data engineers, product managers, business stakeholders, and clients to design, develop, and optimize scalable backend services and APIs.

• Contribute to architectural decisions, performance tuning, and implementation of best practices for reliability, security, and maintainability.

What we offer:

• To encourage cultural awareness and philanthropy, BBHers have 1 Culture Celebration Day and 1 Community Service Day in addition to their paid standard vacation allowance

• Private medical care

• Life Insurance

• Employee Assistance Program - offering independent and confidential counselling services for you and your family. You can get support for topics including family, marriage and relationships, finances, and legal issues.

• Professional trainings and qualification support

• Wellbeing Program

• Online Social Fund benefit platform

• Social, sport and integration events

• Onboarding Program for new hires

Desired Qualifications:

• 10+ years of professional experience in backend software development using Python 3.x.

• Strong expertise in Python frameworks for Data, ORM, and Web Service layers.

• Solid foundation in Object-Oriented Programming, Design Patterns, and Software Architecture Principles (e.g., microservices, layered architecture).

• Proficient in SQL — able to write and optimize queries for databases such as Oracle and SQL Server.

• Strong experience with message brokers, particularly Apache Kafka, or other messaging systems.

• Hands-on experience deploying and managing server-side Python applications in containerized or cloud environments — OpenShift preferred; AWS or Azure experience also acceptable.

• Practical experience with testing frameworks such as pytest, unittest, or nose, and a strong understanding of TDD principles.

• Working knowledge of CI/CD pipelines using tools such as Jenkins, GitHub Actions, or GitLab CI, and experience with Docker-based builds.

• Experience with ML and data analysis libraries such as NumPy, pandas, and scikit-learn - particularly for building, integrating, or optimizing data-driven backend features.

• Comfortable with Linux/Unix systems and scripting for automation and troubleshooting.

• Experience working in Agile environments (Scrum, Kanban).

• Excellent analytical, debugging, and problem-solving skills — including performance profiling, log analysis, and root-cause diagnosis.
   

Nice to Have
 

• Exposure to data modeling, ETL workflows, or data pipelines.

• Background or interest in Machine Learning, AI, or data-driven applications beyond backend integration.

• Familiarity with test automation tools

• Understanding of RESTful API and GraphQL API design best practices

We value diverse experiences. We value diverse experiences and transferrable skillsets. If your career hasn't followed a traditional path, includes alternative experiences, or doesn't meet every qualification or skill listed in the job description, please do go ahead and apply.

About BBH:

Brown Brothers Harriman (BBH) is a premier global financial services firm, known for premium service, specialist expertise, technology solutions and partnership approach to client management. Across Investor Services and Capital Partners, we work with an enviable roster of sophisticated clients who make BBH their first call when they are tackling their hardest challenges. Delivering for our clients and each other energizes us.

We believe that how we do our work is just as important as what we do. We are relentless problem solvers who know our best ideas come from collective debate and development—so we are never possessive about our ideas. Every day we come together as a diverse community of smart and caring people to deliver exceptional service and expert advice—creating success that lasts. No matter where you sit in the organization, everyone is empowered to contribute their ideas. BBHers can pick up the phone and call any colleague, and they are happy to help. Expanding your impact beyond your daily role is part of how we operate as trusted partners to one another. 

We believe stability is a competitive advantage, but being stable means having the knowledge, skill, and discipline to evolve, often—pushing the boundaries of innovation.  As a private partnership, every investment we make is in the relationships, technologies, products and development we believe are in the long-term interests of our clients and our people. Our long-tenured leaders are experts in their areas and are actively involved in the day-to day business, taking the time to provide guidance and mentoring to build the next generation of BBHers. Because we know, our success begins with yours.

Go to to learn more about our rewards and benefits, philanthropy, approach to sustainability or how we support you to thrive personally, physically and financially.