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