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Offer summary
(Summary generated by AI based on the full job description)
The project involves building and modernizing a large-scale transaction processing platform for a capital markets financial institution. The stack includes Java, microservices, event-driven architectures and cloud-native solutions with containerization and orchestration. Responsibilities cover designing and developing backend services, owning components through their lifecycle, ensuring reliability, scalability and performance of distributed systems, and driving automation of delivery using CI/CD and AI-assisted tools.
from: 1 October 2026
to: 31 October 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:hybrid • full office
Warszawa, Mokotów
Requirements
Expected technologies
Java
SDLC
Docker
Kubernetes
GitHub Copilot
Optional technologies
AWS
Devin AI
Claude (Anthropic)
Our requirements
- At least 5 years of professional experience in backend software development using Java
- Strong knowledge of modern application frameworks, event-driven architectures, and microservices development
- Hands-on experience with containerization and orchestration platforms in cloud-native environments
- Familiarity with CI/CD practices, source control systems, and modern software delivery processes
- Strong analytical and problem-solving skills combined with attention to quality and detail
- Fluent English and willingness to work in a hybrid model, including regular office presence three days per week
Your responsibilities
- Designing, developing, and enhancing cloud-based backend services supporting transaction processing platforms
- Taking ownership of selected system components throughout their entire lifecycle, from architecture and implementation to production support
- Leveraging AI-powered development tools to accelerate software design, specification, and coding activities
- Collaborating with business and operational teams to improve efficiency through automation and technology-driven solutions
- Contributing to the reliability, scalability, and performance of distributed systems operating in a global environment
- Supporting continuous improvement initiatives related to software delivery, monitoring, and operational excellence
About the project
Join an international technology team delivering solutions for a leading financial institution operating in the capital markets sector. In this role, you will contribute to the development of a large-scale platform supporting the processing and completion of financial transactions. Working within a distributed engineering environment, you will help modernize critical systems through cloud technologies, automation, and AI-assisted software development practices. This position offers the opportunity to collaborate with both technical and business stakeholders while building highly available, enterprise-grade 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
- 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.
Warszawa, Mokotów
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