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Fullstack Developer – Python and Java (f/m/x) Miejsce pracy: Katowice Technologies we use Expected Python Java NumPy Flask Django Optional Natural Language Processing KDB Cloud Computing About the project Join the AI Markets team within Corporate and Institutional Banking Technology builds award‑winning digital solutions that transform how institutional investors access and interact with global markets. Using advanced NLP, the platform delivers real‑time insights, research, pricing, and trading data directly to clients. You’ll work in small, self‑organising teams focused on continuous delivery and high‑quality production support. Your responsibilities Work within a team of 4–6 people alongside a dedicated Product Owner Break down business requirements into user stories and deliver each story iteratively to production Provide ongoing product support Identify areas of technical debt and ensure a healthy balance between addressing tech debt and developing new functionality Design solutions for new items, ensuring alignment with technology guidelines, standards, and constraints Pair with other team members to collaborate, review code, and share knowledge Our requirements Over 5 years of solid experience working with Python Strong proficiency in Pandas, NumPy, and either Flask or Djangous Comfortable collaborating with both local and global teams Good understanding of Agile development methodology Capable of providing leadership and guidance to junior team members Effective written and verbal communication skills in English Willingness to work in a hybrid model, with on-site presence in Kraków twice per week Optional Background in machine learning, NLP or AI Knowledge of FX or Rates pricing systems Familiarity with KDB or cloud-based solutions What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People Recruitment stages Send your CV Talk to us about your expectations Learn more about our projects and choose the best Start your adventure with Sii! Sii Sp. z o.o. Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment. Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.