We are 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.
What the project involves
- 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. Moving data and functionality from Oracle to the new stack in a way that supports parallel run, reconciliation, and a safe cutover for a system that cannot go down.
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.
What you'll need to succeed in this role
- 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.
Perks & 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.
- 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.
