[Hiring] Senior Java Developer @Addepto

Role Description

As a Senior Java Developer, you will join the team at the moment when requirements and target architecture are in place and the build starts. This is a hands-on implementation role— the large majority of your time goes into writing, testing, and shipping production code, not into high-level design or governance.

• Re-implementing legacy logic.
• Working through existing Java/Spring code, Oracle schemas, and PL/SQL, extracting the business rules that actually run the operation, and rebuilding them as clean, well-tested Spring Boot services.
• Building the new platform on Azure.
• Implementing services, integrations, and APIs on Azure with PostgreSQL as the operational database and Databricks for analytics and reporting data.
• Migrating without stopping operations.

Your main responsibilities:

• Design and implement backend services in Java and Spring Boot, from domain model and business logic through persistence and API layers.
• Analyze legacy Java/Spring code and Oracle PL/SQL, and re-implement business logic in the new services, with tests that prove behavioural parity.
• Build the PostgreSQL data layer: schema design, JPA/Hibernate mappings, versioned migrations (Flyway / Liquibase), and query performance tuning.
• Implement Oracle → PostgreSQL data migration and reconciliation tooling to support parallel run and cutover.
• Develop REST APIs (contract-first, OpenAPI) consumed by operational portals and integrated systems.
• Implement asynchronous integrations and event flows (e.g. Azure Service Bus, Kafka), including retries, idempotency, and error handling.
• Deliver data feeds from the operational platform into Databricks in cooperation with data engineers.
• Write automated tests at every level (JUnit, integration tests with Testcontainers, contract tests) and keep the codebase production-ready.
• Contribute to CI/CD pipelines, containerization, and deployment to Azure across DEV / TEST / PROD environments.
• Build in logging, monitoring, and alerting so the system can be run 24/7; take part in troubleshooting and production readiness ahead of go-live.
• Work closely with the Business Analyst / Product Owner on user stories and acceptance criteria, and do code reviews within the team.

Qualifications

• At least 5+ years of commercial experience as a Java backend developer, with hands-on coding as your main activity in recent projects.
• Strong programming skills in Java (5+), Spring Boot, and the Spring ecosystem (Spring Data, Spring Security, Spring Integration a plus).
• Solid relational database skills: PostgreSQL and Oracle, including SQL, JPA/Hibernate, schema migrations, and performance tuning; ability to read and understand PL/SQL.
• Experience working with legacy codebases—reading, refactoring, and migrating existing logic safely.
• Experience building REST APIs and asynchronous, message-driven integrations (Kafka, Azure Service Bus, RabbitMQ, or IBM MQ).
• Working knowledge of Azure (e.g. AKS or App Service, Azure Functions, Service Bus, Key Vault, Entra ID) and containerization with Docker / Kubernetes.
• Strong testing discipline: unit, integration, and contract testing as a standard part of delivery.
• Experience with business-critical, high-availability systems where reliability and correctness matter.
• Experience using AI coding assistants / agentic workflows as part of day-to-day delivery.
• Good communication skills in English and a pragmatic, get-it-built attitude.

Benefits

• Work in a supportive team of passionate enthusiasts of AI & Big Data.
• Engage with top-tier global enterprises and cutting-edge startups on international projects.
• Enjoy flexible work arrangements, allowing you to work remotely or from modern offices and coworking spaces.
• Accelerate your professional growth through career development paths, knowledge-sharing initiatives, language classes, and sponsored training and conferences.
• Benefit from partnerships with Databricks and Anthropic, which provide access to industry-leading training materials and certification programs.
• Participate in team-building events and utilize the integration budget.
• Celebrate work anniversaries, birthdays, and milestones.
• Access medical and sports packages, eye care, and well-being support services, including psychotherapy and coaching.
• Get full work equipment for optimal productivity, including a laptop and other necessary devices.
• With our backing, you can boost your personal brand by speaking at conferences, writing for our blog, or participating in meetups.
• Experience a smooth onboarding with a dedicated buddy, and start your journey in our friendly, supportive, and autonomous culture.