Senior Fullstack Java Engineer – Hybrid (Amsterdam)

Vacant; Amsterdam; Hybrid; EUR 90,000 - 120,000; Full time

Job summary

JET in Amsterdam is seeking an experienced engineer to consolidate fragmented partner data into a global event-driven architecture. You will break down monolithic apps into microservices using Java/Spring and .NET, and help build tooling for operations while collaborating across teams.

You will design scalable services, mentor junior developers, and contribute to API and event contracts, AWS deployments, Docker/Kubernetes pipelines, and modern testing practices to ensure robust, observable

Qualifications

• Backend engineering experience with event-driven microservices.
• Experience with Java/Spring or C#/.NET stacks.
• Knowledge of API/Event contracts and messaging queues (Kafka).
• Hands-on with AWS, Docker, Kubernetes and CI/CD tooling.
• Familiarity with OpenAPI/AsyncAPI and observability tools.

Responsibilities

• Design and implement high-performance, scalable event-driven microservices for the partner domain.
• Partner with product teams to translate requirements into technical specifications, and align with cross-functional teams on API/Event contracts (e.g., OpenAPI, AsyncAPI, Confluent).
• Write clean, efficient, and well-documented code while actively mentoring junior developers and driving code reviews to ensure system maintainability.
• Maintain, investigate, and document the revenue-driving legacy platform, acting quickly to debug and resolve any operational issues.
• Proactively explore emerging technologies and AI-driven tools to automate repetitive tasks, simplify full-stack complexities, and elevate overall code quality.
• Actively participate in team brainstorming sessions, communicate progress on complex features, and remain open to learning and innersourcing across new tech stacks.

Skills

Event-driven design

Java Spring

C# / .NET

Microservices

API contracts

OpenAPI

AsyncAPI

Kafka

AWS

CI/CD

Testing

Tools

Docker

Kubernetes

Helm charts

AWS

CI/CD pipelines

OpenTelemetry

Datadog

Testcontainers

Git

Job description

JET in Amsterdam is seeking an experienced engineer to consolidate fragmented partner data into a global event-driven architecture. You will break down monolithic apps into microservices using Java/Spring and .NET, and help build tooling for operations while collaborating across teams.

You will design scalable services, mentor junior developers, and contribute to API and event contracts, AWS deployments, Docker/Kubernetes pipelines, and modern testing practices to ensure robust, observable