Senior Java Developer (Platform Modernization)

Addepto

1d•Hybrid

About The Position

Addepto is modernizing a large, business-critical operational platform that has evolved over many years and combines application logic, database-level rules, and partly manual operational processes. The project involves transitioning the existing solution towards a modern, cloud-native architecture, delivered by a small senior team working with heavy AI leverage. 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. The project involves re-implementing legacy logic, building the new platform on Azure, and migrating without stopping operations.

Requirements

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.

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.

Benefits

Flexible work arrangements, allowing you to work remotely or from modern offices and coworking spaces.
Career development paths, knowledge-sharing initiatives, language classes, and sponsored training and conferences.
Partnerships with Databricks and Anthropic, which provide access to industry-leading training materials and certification programs.
Team-building events and utilization of the integration budget.
Celebration of work anniversaries, birthdays, and milestones.
Access to medical and sports packages, eye care, and well-being support services, including psychotherapy and coaching.
Full work equipment for optimal productivity, including a laptop and other necessary devices.
Opportunity to boost personal brand by speaking at conferences, writing for our blog, or participating in meetups.
Smooth onboarding with a dedicated buddy.
Friendly, supportive, and autonomous culture.