JAVA Developer/Engineer with Quarkus

Summary: The role is for a JAVA Developer/Engineer with expertise in Quarkus, aimed at supporting an international client in migrating APIs from Mulesoft to JAVA as part of a legacy system transition to microservices. The position requires a minimum of 5 years of JAVA development experience and a preference for candidates with team lead experience. The role is fully remote and expected to start ASAP for a duration of 3 months with a possibility of extension.

Key Responsibilities:

• Low level design
• Development and migration of APIs from Mulesoft to JAVA
• Technical development based on requirements
• Building and consuming REST APIs, MicroProfile REST Client or similar
• HTTP client patterns, error handling, retry strategies
• Act as lead JAVA Engineer

Key Skills:

• More than 5 years of experience in JAVA Development
• Project experience with Core Java version 17 upwards, preferably experience with JAVA 25
• Strong project experience with Quarkus 3.x
• Strong project experience with Apache Kafka
• Minimum of 2 years of project experience with event-driven / message-driven architectures
• Experience in migrating legacy systems (ESB, monolith) to microservices - preferred
• Experience with SQL / Relational Databases - preferably PostgreSQL
• Experience with building and consuming REST APIs, MicroProfile REST Client
• Preferred: Experience as team lead or lead Engineer JAVA
• Experience in the manufacturing industry - preferred
• Fluency in English

Salary (Rate): undetermined

City: undetermined

Country: Germany

Working Arrangements: remote

IR35 Status: undetermined

Seniority Level: undetermined

Industry: IT

Detailed Description From Employer:

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JAVA Developer/Engineer with Quarkus - 3+ months - Remote - Start ASAP

For our international client, we are looking for an experienced JAVA Developer/Engineer with experience in Quarkus.

Your main task is to support the client in the migration of APIs from Mulesoft to JAVA as part of a migration of legacy systems (ESB, monolith) to microservices.

Team lead or experience as a lead Engineer is preferred.

Tasks:

* Low level design

* Development and migration of APIs from Mulesoft to JAVA

* Technical development based on requirements

* Building and consuming REST APIs, MicroProfile REST Client or similar

* HTTP client patterns, error handling, retry strategies

* Act as lead JAVA Engineer

Requirements:

* More than 5 years of experience in JAVA Development

* Project experience with Core Java version 17 upwards, preferably experience with JAVA 25

* Strong project experience with Quarkus 3.x

* Strong project experience with Apache Kafka

* Minimum of 2 years of project experience with event-driven / message-driven architectures

* Experience in migrating legacy systems (ESB, monolith) to microservices - preferred

* Experience with SQL / Relational Databases - preferably PostgreSQL

* Experience with building and consuming REST APIs, MicroProfile REST Client

* Preferred: Experience as team lead or lead Engineer JAVA

* Experience in the manufacturing industry - preferred

* Fluency in English

Project details:

* Start: ASAP

* Duration: 3 months (+ option to extend)

* Workload: 5 days per week

* Location: 100% remote (European based only)

* Languages: Fluency in English

Telephone interview slots with our client can be arranged at short notice with a decision immediately thereafter.

Reference
CR/133550_1775037221

Date
1 Apr 2026

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