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Ubique Systems · Cracow, Małopolskie, Poland

Java Software Engineer

seniorcontractPosted today
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Stack mentioned

javablockchainapache-kafkakuberneteshelmethereumsystem-designdevopsspringhibernatesqltest-automationjunitunit-testingobservabilitysoliditynosqlmongodbrediscopilot

Role Summary: We are seeking a Senior Java Software Engineer to develop reliable, scalable cloud-native applications for digital-assets and blockchain projects. The role focuses on Java, RESTful services, Kafka-based event-driven architecture, Kubernetes, Helm, secure development, implementation leadership, and mentoring, while supporting the development team when application issues occur.

Key Responsibilities

- Design and develop reliable, scalable cloud-native Java applications.

- Build RESTful services and Kafka-based event-driven solutions.

- Deploy and support applications on Kubernetes using Helm.

- Lead implementations and contribute to secure, high-quality code.

- Support the development team in diagnosing and resolving application issues.

- Mentor junior developers and provide code-review feedback.

- Contribute to blockchain and digital-asset solutions, particularly Ethereum-related projects.

- Collaborate with technology and business stakeholders in English.

Essential Skills — Mandatory

- Java: At least 5 years of experience in Java.

- Cloud-Native Distributed Systems: Expertise in developing cloud-native applications for distributed systems using RESTful web services and Kafka-based event-driven architectures.

- Kubernetes and Helm: Hands-on experience with Kubernetes and Helm.

- Security: Strong attention to detail and security awareness.

- Technology Trends: Interest in cloud computing, DevOps practices, blockchain technologies, and digital assets.

- Communication: Excellent communication skills and the ability to interact effectively with colleagues in English.

Preferred Skills — Good to Have

- Engineering Leadership: Ability to lead implementations, conduct code reviews, and mentor junior developers.

- Blockchain and DLT: Experience contributing to distributed-ledger projects, particularly Ethereum-based solutions.

- Digital Assets: Understanding of tokenization or digital-asset platforms.

- Spring Boot: Experience with Spring Boot and related Spring components.

- Data and Persistence: Experience with JPA or Hibernate, SQL, and relational databases.

- Automated Testing: Experience with JUnit, Mockito, and integration testing.

Additional Skills — Optional

- Observability: Familiarity with application logging, metrics, and tracing tools.

- API and Platform Security: Familiarity with authentication, authorization, certificates, and secrets management.

- Smart Contracts and Web3: Familiarity with Solidity, Web3 libraries, or blockchain integration patterns.

- NoSQL and Caching: Familiarity with MongoDB, Redis, or another non-relational data platform.

- Reactive Programming: Familiarity with Spring WebFlux or Project Reactor.

- AI-Assisted Development: Familiarity with tools such as GitHub Copilot.

- Certifications: A relevant Java, Spring, cloud, Kubernetes, or blockchain certification.

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