Lead Java Developer (f/m/x)

Sii Poland

Warszawa

Hybrid

PLN 210,000 - 270,000

Full time

14 days+

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Benefits offered by this job

Great Place to Work

Solid financial situation

Centre of internal trainings

Many experts you can learn from

Profit sharing

Regular integration events and trips

Job summary

Sii Poland is seeking an experienced Java Tech Lead to shape technical solutions, guide the development team, and ensure delivery of high‑quality software products. The role blends hands-on coding with technical leadership, mentoring engineers, and aligning technical work with business goals.

Responsibilities include driving architecture, leading design discussions, and ensuring scalable backend services with REST APIs.

Qualifications

8+ years of professional experience in software engineering with Java.
Experience as Technical Lead / Lead Developer or similar with mentoring responsibilities.
Strong Java 17+ and Spring Boot expertise.
Solid understanding of software architecture, distributed systems, and RESTful API design.
Fluent in English and Polish; hybrid work with office presence 3 days/week; resident in Poland.

Responsibilities

Lead technical design discussions and drive architectural decisions across the team.
Evaluate and propose scalable, maintainable, and high-performance solutions.
Provide technical guidance to developers throughout the SDLC.
Design and develop backend services and REST APIs using Java and Spring Boot.
Perform hands-on coding for complex features and critical system components.
Support production releases and ensure platform stability.

Skills

Java

Distributed systems

REST API design

Mentoring

English

Polish

Tools

Spring Boot

Job description

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.

Your tasks

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

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

Job no. JOB-RQREU

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

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