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Offer summary
(Summary generated by AI based on the full job description)
The project focuses on backend development using Java 17+ and Spring Boot. The main responsibilities include leading architectural decisions and mentoring the team. Tasks cover designing and developing backend services and REST APIs, supporting production releases, and ensuring platform stability. Knowledge of software architecture and distributed systems is required along with experience as a technical lead.
from: 24 June 2026
to: 24 July 2026
salary not specifiedB2B contract
Offer parameters
level:senior
working mode:hybrid • full office
Warszawa, Mokotów
Requirements
Expected technologies
Java
PostgreSQL
Spring Boot
Kubernetes
REST
Our requirements
- At least 8 years of professional experience in software engineering with Java
- Previous experience as a Technical Lead, Lead Developer, Senior Developer with mentoring responsibilities, or a similar leadership role
- Strong expertise in Java 17+ and Spring Boot
- Solid understanding of software architecture, distributed systems, and RESTful API design
- Fluency in English
- Open to a hybrid working model with presence in the office 3 days per week
- Availability to support production releases approximately 1–2 times per month during weekends (around 2 hours per occurrence)
- Fluent Polish required
- Residing in Poland required
Your responsibilities
- Leading technical design discussions and driving architectural decisions across the team
- Evaluating and proposing technical solutions to ensure scalability, maintainability, and performance
- Providing technical guidance and support to developers throughout the software development lifecycle
- Designing and developing backend services and REST APIs using Java and Spring Boot
- Performing hands-on coding for complex features and critical system components
- Supporting production releases and ensuring platform stability
About the project
We are looking for an experienced Java Tech Lead who will play a key role in shaping technical solutions, guiding the development team, and ensuring the successful delivery of high-quality software products.
This position combines hands-on development with technical leadership. You will be responsible for driving architectural decisions, mentoring engineers, collaborating with Product Owners and Business Stakeholders, and ensuring that technical solutions align with business objectives and engineering best practices.
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 promote a diverse and inclusive work environment.
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
Lead Java Developer (f/m/x)
I apply to:
Sii Sp. z o.o.
Warszawa, Mokotów
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