Java Backend Engineer: Microservices, AWS & GraphQL

expleo-jobs-pt-en; Lisboa; On-site; EUR 48,000 - 72,000; Full time

Job summary

Expleo is seeking an experienced Backend Java Developer to join our engineering team in Lisbon. You will work on Java-based microservices, REST APIs and GraphQL, focusing on secure authentication flows and scalable messaging solutions.

Ideal candidates have 3–4+ years in backend roles, strong English communication, and proven ability to collaborate across disciplines in a fast-paced, international environment. Experience with AWS SQS is a plus.

Qualifications

• 3–4+ years of backend or Java development experience.
• Strong Java, microservices, REST APIs and GraphQL proficiency.
• Knowledge of authentication and authorization flows.
• Experience with event-driven development and messaging systems.
• Experience with AWS Cloud (SQS).
• Good English communication and collaboration skills.

Skills

Backend development

Java

Microservices

REST APIs

GraphQL

Authentication/Authorization

Event-driven development

Messaging systems

AWS Cloud (SQS)

English communication

Tools

AWS Cloud

Job description

Expleo is seeking an experienced Backend Java Developer to join our engineering team in Lisbon. You will work on Java-based microservices, REST APIs and GraphQL, focusing on secure authentication flows and scalable messaging solutions.

Ideal candidates have 3–4+ years in backend roles, strong English communication, and proven ability to collaborate across disciplines in a fast-paced, international environment. Experience with AWS SQS is a plus.