Senior Java Engineer

Accountabilities

• Design, develop, and maintain enterprise-grade applications using Java and Spring Boot, taking ownership of features throughout their full lifecycle from design to production.


• Lead the technical design of significant application components, including service boundaries, data models, integration patterns, and non-functional requirements.


• Collaborate with Product Managers, Solution Architects, DevOps Engineers, and other stakeholders to translate business requirements into scalable technical solutions and challenge requirements when technical trade-offs need to be addressed.


• Own application reliability, performance, security, and compliance with relevant security and regulatory standards.


• Design and maintain integrations with external systems, APIs, and third-party service providers.


• Write clean, efficient, maintainable, and testable code while promoting sound engineering practices and established design principles.


• Improve CI/CD pipelines, automated testing, observability, deployment processes, and overall engineering efficiency.


• Lead code reviews, mentor junior and mid-level engineers, and serve as a technical escalation point for complex engineering challenges.


• Participate in production incident response, conduct root-cause analysis, and implement durable solutions to prevent recurring issues.


• Contribute to technical innovation and stay informed about emerging technologies and trends across software engineering and the payments industry.

• 5+ years of professional Java development experience, with a proven track record of owning complex, production-grade systems.


• Strong expertise in modern Java, particularly Java 21/25 LTS, and Spring Boot 4 / Spring Framework 7 for developing RESTful and event-driven microservices.


• Solid experience with Apache Kafka and asynchronous processing, including concepts such as idempotency and exactly-once semantics.


• Strong knowledge of relational databases such as PostgreSQL and MySQL, along with ORM technologies including Hibernate and JPA.


• Proven API design capabilities using REST and OpenAPI, with a strong understanding of integration patterns and best practices.


• Hands-on experience with AWS, Docker, Kubernetes, and modern CI/CD tooling, including Maven or Gradle, GitHub Actions, Helm, and Terraform.


• Strong testing practices using technologies such as JUnit 5, Mockito, and Testcontainers.


• Practical experience with production observability and monitoring tools such as OpenTelemetry, Prometheus, and Grafana.


• Working knowledge of security concepts including encryption, OAuth2/OIDC, JWT, mutual TLS, HSM integration, and tokenization.


• Practical experience using AI coding assistants and LLMs as part of the software development workflow, combined with the judgment required to validate and refine AI-generated output.


• Experience mentoring engineers, leading code reviews, and collaborating effectively within distributed and international teams.


• Strong attention to precision, reliability, security, and code quality.


• Adaptability and curiosity, with the ability to move across technical domains and business problem spaces while maintaining delivery momentum.


• Strong communication and collaboration skills when working with diverse technical and business stakeholders.


• A high level of ownership and accountability, with a proactive approach to delivering production-ready solutions.


• A technical leadership mindset focused on improving engineering standards across the wider team.

• Work on high-impact technology solutions within the payments and fintech sector.


• Take significant technical ownership over scalable, secure, and business-critical platforms.


• Work remotely from Germany within a distributed European environment.


• Collaborate with experienced technical and business professionals across different teams and geographies.


• Opportunity to influence architecture, engineering standards, development practices, and technical direction.


• Continuous exposure to modern technologies across cloud infrastructure, distributed systems, security, observability, and payment technology.


• Opportunities to mentor engineers and expand your technical leadership responsibilities.


• A collaborative environment that values precision, reliability, innovation, ownership, and continuous learning.


• Work on complex engineering challenges where scalability, security, and performance are central to the product experience.


• Full-time employment with an experienced/senior-level scope.

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