Senior Java Developer (K/M)

Senior Java Developer (K/M)
We are looking for experienced Java Developers who want to grow their skills and work on interesting projects in the retail and sales technology area.
You will be joining a team working on POS and BackOffice solutions supporting sales, store operations, integrations, reporting, payments, fiscalisation, and other retail-related processes.
Your responsibilities
– Designing and developing efficient, scalable, and stable software.
– Participating in the design and implementation of new features.
– Supporting technical decision-making and selecting appropriate technologies and implementation approaches.
– Working on the optimisation of the software development process.
– Analysing technical requirements and proposing practical, maintainable solutions.
– Supporting integration design between POS, BackOffice, payment systems, fiscal devices, external platforms, and other retail systems.
– Taking ownership of complex technical topics and supporting the team in solving architectural or implementation challenges.
– Cooperating with developers, analysts, testers, product owners, and other stakeholders.
– Reviewing code and supporting good engineering practices within the team.
Our requirements
– At least 5 years of commercial experience in IT.
– Very good knowledge of Java.
– Experience with Spring Boot, Spring Cloud, JPA, and SQL.
– Good understanding of backend application design and system integration.
– Experience in designing stable, maintainable, and scalable solutions.
– Ability to analyse business and technical requirements and translate them into clean technical solutions.
– Experience with relational databases and query optimisation.
– Practical knowledge of Git-based version control.
– English at B2 level or higher.
– Ability to write, understand, review, and maintain code independently, without relying on LLM-based tools - we do allow and encourage you use all kinds of tools, including AI, but we expect you to have a deep understanding of the results
– Good communication skills and the ability to work in a team.
– Responsibility for delivered solutions and a proactive approach to problem-solving.
Nice to have
– Experience as a Tech Lead, Lead Developer, or Solution Architect.
– Experience in making or supporting architectural decisions.
– Experience with POS, retail, payments, fiscalisation, or enterprise sales systems.
– Experience with desktop applications or applications running in store environments.
– Knowledge of multithreading, performance optimisation, and offline-first systems.
– Awareness of web technologies
– Experience with CI/CD, GitLab pipelines, automated testing, or deployment processes.
Technologies we use
POS
– Java
– Multithreading
– Plain JDBC
– Web client used in integrations
– Swing for UI
– SQLite embedded database
BackOffice
– Java 21
– Spring JDBC
– Tomcat as a web application container
– Apache Wicket
– PostgreSQL
– JasperReports
– Karate
We offer:
– Employment in a reputable organization (ITwiz BEST100), operating in accordance with international quality and security standards (ISO 9001, ISO 27001)
– A non-corporate atmosphere and a flat organizational structure
– Opportunities for continuous development through:
– working with a variety of technologies on projects for well-known clients
– collaboration with an experienced team of experts who are eager to share their knowledge
– co-financing of training and certifications
– Employee Referral Program
– Participation in charitable initiatives, including cooperation with the Joanna Radziwiłł Foundation “Opiekuńcze Skrzydła” and involvement in the “Gwiazdorzymy” holiday campaign
– Private healthcare (LUX MED), 50% co-financing of the Multisport card, co-financing of foreign language learning, and access to a wellbeing platform.
– A diverse and inclusive work environment – our company brings together representatives of four generations
– Equal development opportunities – 50% of managerial and leadership positions are held by women
– Organizational culture based on values:
– we act with good intentions
– we share knowledge
– we take responsibility
– we continuously improve people are our top priority
– we act with a clear sense of purpose and meaning
– we communicate honestly and professionally