Mid-Level Java Backend Developer

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

Overview

Expleo is a trusted partner for your innovation journey. As a global engineering, technology and consulting service provider, we are ideally positioned to help you achieve your ambitions and future-proof your business. With a smart blend of bold thinking and reliable execution, we’re able to fast-track innovation through each step of your value chain.

We are strategically positioned to build value, with global footprint across 30 countries.We are as global and local as you need us to be, with strong best-in-class pan-European technological centres and unique best-shoring capabilities.

We leverage a network of high value-adding affiliates in consulting and industrial excellence, and leading partners across multiple sectors to provide you with the most comprehensive services and solutions in an ever-changing environment.

Essential skills

• Professional experience (3–4+ years) as a Backend Developer, Java Developer, or in similar roles;
• Strong proficiency in Java, microservices, REST APIs, and GraphQL;
• Solid knowledge of authentication and authorization flows;
• Professional experience with event-driven development as well as messaging systems;
• Professional experience with AWS Cloud (SQS);
• Good communication skills in English, with the ability to collaborate, solve problems, and pay attention to detail.