Senior Java Engineer - Cloud-Native Backend Development 100% (f/m/d) - (Contract through our external payroll partner wi

Description

The team is modernising a large legacy application as part of a strategic initiative at a wealth management firm.

You will lead the design and development of a critical cloud-native backend system that is part of that work.

Responsibilities

• Lead a full re-architecture of the system on modern Java, mainly with Spring Boot.
• Build scalable, resilient services from scratch.
• Develop and run high-throughput distributed systems in the cloud.
• Use current practices, including AI-assisted tools, to speed up delivery without lowering quality.
• Apply deep backend, cloud and performance tuning expertise to enterprise Java work.
• Act as technical lead across complex transformation programmes.

Requirements

• You have 8+ years of server-side Java development.
• Ideally, that experience comes from financial or other regulated, high-performance settings.
• You work fluently in Java 21+ and the Spring ecosystem: Spring Boot, Spring Data, Spring Security and Spring Cloud.
• You design high-throughput, low-latency systems using asynchronous processing, message brokers such as Kafka or RabbitMQ, and caching with Redis or Caffeine.
• You have worked with workflow or BPMN frameworks such as Flowable or Camunda, or with streaming and analytics platforms such as TIBCO StreamBase or Spotfire.
• You have built, run and refactored cloud-native microservices on AWS, Azure or GCP, including moving monolithic systems to them.
• You know containers (Docker), orchestration (Kubernetes), service mesh, and cloud storage and services.
• You design and consume REST APIs and gRPC services, including protocol buffers, streaming and polyglot integration.
• You secure APIs and services with OAuth2, JWT, TLS and identity providers.
• You apply observability with Micrometer and OpenTelemetry: metrics, distributed tracing and contextual logging.
• You have practical experience with AI-assisted development and generative AI tools in IDEs and code reviews.
• Experience in the Markets and/or Trading domain is preferred.
• You solve problems with a clear mindset and explain technical trade-offs to peers and stakeholders.
• You collaborate proactively in agile, cross-functional teams and have mentored junior engineers.
• Business-fluent English at C1 or C2 level.

Conditions

Contract of 12 months starting immediately, with a possible extension.

Engagement runs through an external payroll partner.

Full-time, 100%.

Open to all genders (f/m/d).