Senior Backend Engineer

We are looking for a Senior Backend Software Engineer to join the B2B Portals Team working with Raisin, a fintech company operating a digital savings and investment marketplace. You will contribute to partner-facing platforms that allow banks, brokers, and financial advisors to offer Raisin deposit products to their customers. The team owns the full development lifecycle - from solution design and implementation to deployment and production support. Responsibilities: - Develop and maintain backend services using Java and Spring Boot; - Deliver features from technical design to production rollout; - Build APIs and integrations for banks and other B2B partners; - Write unit, integration, and contract tests; - Investigate production issues using logs, metrics, and traces; - Conduct code reviews and contribute to engineering standards; - Improve service performance, security, and reliability; - Participate in the team’s on-call rotation; - Mentor engineers and support knowledge sharing; - Promote the effective and safe use of AI-assisted development tools; - Collaborate with distributed teams and stakeholders across Europe and the US. Requirements: - 5+ years of commercial Java development experience; - Strong knowledge of Java, Spring Boot, and Spring Data; - Experience with AWS and cloud-based applications; - Experience with REST APIs, distributed systems, and service integrations; - Knowledge of relational databases, preferably MySQL; - Experience with asynchronous messaging, particularly Amazon SQS; - Strong testing skills with JUnit and Testcontainers; - Experience with CI/CD, Docker, and Kubernetes; - Ability to independently own and deliver backend features; - Experience debugging production systems; - Mentoring and code review experience; - Fluent English. Nice to have: - Experience with fintech or banking integrations; - Knowledge of Pact contract testing; - Experience with Apache Kafka or Amazon MSK; - Experience with event-driven systems; - Experience with OpenTelemetry, Datadog, or Splunk; - Familiarity with GitLab CI/CD, Harness, Amazon EKS, or Airflow; - Experience with multi-tenant B2B platforms; - Practical experience with AI-assisted development tools. We offer*: - Flexible working format - remote, office-based or flexible - A competitive salary and good compensation package - Personalized career growth - Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) - Active tech communities with regular knowledge sharing - Education reimbursement - Memorable anniversary presents - Corporate events and team buildings - Other location-specific benefits *not applicable for freelancers