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Senior Software Engineer - Java/Kotlin Poland Jobs (On-site work)

7 Job Offers

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Senior Software Engineer (C++, Qt)
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Poland , Katowice
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12000.00 - 17000.00 PLN / Month
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Sopra Steria
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Until further notice
Senior Software Engineer - Test Automation/Java
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Senior Software Engineer – Test Automation (Java) role in Warsaw, Poland. Join Mastercard's Developer Experience team to build and maintain high-quality automated tests and frameworks. Requires 5+ years of experience, strong Java skills, and expertise in API, UI, and distributed systems testing. ...
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Poland , Warsaw
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Not provided
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Mastercard
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Senior Software Engineer
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Join Sopra Steria as a Senior Software Engineer (Python/JavaScript) for a major aerospace client. Develop critical aviation applications using ArcGIS and Vue.js in a multinational team. Enjoy a stable industrial environment, benefits like private healthcare, and workation. Occasional travel to Gd...
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Poland , Gdańsk
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12000.00 - 16000.00 PLN / Month
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Sopra Steria
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Until further notice
Senior Software Engineer (Java)
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Join Sopra Steria Polska in Katowice as a Senior Java Engineer. You will integrate the Simpl‑Open middleware into the Language Data Space, focusing on secure onboarding, APIs, and semantic interoperability. We seek strong Java/Spring Boot skills with Docker, OAuth 2.0, and REST API experience. En...
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Poland , Katowice
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12000.00 - 16000.00 PLN / Month
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Sopra Steria
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Until further notice
Senior Software Engineer
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Join our Warsaw team as a Senior Software Engineer. You will design and deploy enterprise-grade software using Python, C#/.NET, and ReactJS. A key focus is solving complex ESRI platform mapping problems to enhance telecom network management tools. This role offers ownership from architecture to d...
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Poland , Warsaw
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SSP Innovations
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Senior Software Engineer
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Join Sportradar's Odds Product Division in Warsaw as a Senior Software Engineer. Develop high-performance, cloud-first services using Java, TDD, and AWS for real-time sports data. Thrive in a collaborative, agile environment that values clean code, innovation, and work-life balance. Utilize moder...
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Poland , Warsaw
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Sportradar
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Senior Software Engineer
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Join Sportradar's Odds Division in Warsaw as a Senior Software Engineer. Build high-performance, cloud-first services using Java/C++, AWS, and Kubernetes on real-time sports data. We value engineering quality, a test-first mindset, and offer a collaborative, global environment with true work-life...
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Poland , Warsaw
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Sportradar
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Until further notice

About the Senior Software Engineer - Java/Kotlin role

Explore senior software engineer jobs specializing in Java and Kotlin, a high-demand career path for experienced developers who architect and build robust, scalable software systems. Professionals in this role are pivotal in transforming complex business requirements into efficient, reliable, and maintainable applications. Typically, they engage in the full software development lifecycle, from conceptual design and technical specification to implementation, testing, deployment, and ongoing optimization. A core responsibility involves making critical architectural decisions, often designing and implementing microservices, APIs, and cloud-native solutions that form the backbone of modern digital products.

Senior software engineers in the Java/Kotlin ecosystem commonly shoulder a wide array of duties. They design and develop high-performance backend services, distributed systems, and data processing pipelines. Ensuring code quality is paramount; they rigorously write unit and integration tests, conduct thorough code reviews, and advocate for best practices in clean code and design patterns like MVC. Collaboration is a key aspect, as they frequently work alongside cross-functional teams including product managers, UX/UI designers, DevOps specialists, and other engineers to deliver cohesive user experiences. Furthermore, they often provide technical leadership, mentoring junior developers, driving technical discussions, and contributing to strategic planning and knowledge-sharing initiatives.

The typical skill set for these jobs is extensive. Mastery of Java and/or Kotlin is fundamental, complemented by deep knowledge of JVM internals, concurrency, and memory management. Proficiency with popular frameworks such as Spring Boot, Micronaut, or Quarkus is highly valued. These roles require strong experience with both SQL (e.g., PostgreSQL, MySQL) and NoSQL (e.g., MongoDB, Cassandra) databases, as well as expertise in designing RESTful and often GraphQL APIs. Familiarity with cloud platforms (AWS, Azure, GCP), containerization (Docker, Kubernetes), and CI/CD pipelines is standard for deploying and managing applications. A strong understanding of software architecture principles, including event-driven and serverless designs, is essential.

Candidates seeking senior software engineer jobs are generally expected to possess a bachelor's degree in computer science or a related field, along with 5+ years of professional development experience. Beyond technical acumen, success in this senior role demands excellent problem-solving abilities to debug complex issues, a proactive approach to learning emerging technologies, and strong communication skills to articulate technical concepts to both technical and non-technical stakeholders. This career offers the opportunity to work on challenging problems, influence technology stacks, and build systems that serve millions of users, making it a cornerstone role in the technology industry.

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