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Offer summary
(Summary generated by AI based on the full job description)
The project involves software development for clients across multiple domains. The tech stack centers on Java, Spring Framework, Python and databases PostgreSQL, MongoDB; experience with event streaming and familiarity with ML/NLP/AI are advantageous. Responsibilities cover the full software lifecycle — analysis, design, testing, deployments and production support, collaborative work to break requirements into stories, pair programming and managing technical debt. Required is at least 5 years of experience and knowledge of SOLID, Clean Code, DDD, BDD, with English communication skills.
Senior Java Developer (f/m/x)
Company: Sii Sp. z o.o.
from: 12 October 2026
to: 11 November 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:hybrid • full office
Kraków, Podgórze
Requirements
Expected technologies
Java
Python
Optional technologies
JavaScript
Our requirements
- Minimum 5 years of development experience in Java, Spring Framework and Python
- Deep understanding of key software development concepts such as SOLID, Clean Code, DDD, and BDD
- Experience with SQL/NoSQL databases, including PostgreSQL and MongoDB
- Familiarity with machine learning, NLP, AI, or Data Science is an advantage
- Ability to teach and collaborate with engineers to design new systems and solutions
- Effective communication skills in written and oral English
- Prior experience with event streaming technology
Optional
- Previous work with Prompt Engineering
- Familiarity with LangChain and LangGraph
- Experience in Clean Architecture
Your responsibilities
- Participating in all phases of the development life cycle, including analysis, testing, and production support
- Collaborating within a team to take business requirements, break them into stories, and deliver each story iteratively to production
- Providing product support as an integral part of the role, following the principle that the team builds and supports the product
- Identifying areas of technical debt and ensuring a healthy balance between addressing it and delivering new functionality
- Designing solutions for new items while adhering to technology guidelines and constraints
- Engaging in pair programming with other team members to enhance collaboration and knowledge sharing
About the project
We are looking for an experienced Full Stack Developer to join our client's team in Cracow. In this role, you will participate in all parts of the development life cycle, including analysis, testing, and production support, working closely with a team of 4 to 6 people and a dedicated product owner. If you are passionate about software development and enjoy collaborating with others to design innovative solutions, this opportunity may be the right fit for you.
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
- 1.Send your CV
- 2.Talk to us about your expectations
- 3.Learn more about our projects and choose the best
- 4.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.
This is how we work
Senior Java Developer (f/m/x)
I apply to:
Sii Sp. z o.o.
Kraków, Podgórze
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