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.