Middle Java Engineer

Avenga; Buenos Aires; Hybrid; ARS 1,200,000 - 2,100,000; Full time

Job summary

Avenga is seeking a Semi-Senior Java Developer in Argentina to join a strategic initiative for a leading financial institution. You will design and implement backend services using Java 11+ with Spring Boot microservices, integrating JPA/Hibernate and REST APIs in a regulated environment.

You will contribute to CI/CD improvements, event-driven architectures, and AI-assisted development tools, collaborating with engineers, product owners, QA, and architects to deliver secure, scalable solutions.

Qualifications

• 4+ years of backend Java development experience.
• Strong knowledge of Java 11+ and Java 21 modernization.
• Experience with Spring Boot and REST API development.
• Designing and building microservices architectures.
• Familiarity with JPA/Hibernate and relational databases (PostgreSQL, Oracle, SQL Server).
• Experience with testing frameworks like JUnit and Mockito.
• Understanding CI/CD, Git, Maven, and Docker.
• Experience with asynchronous processing and event-driven architectures.
• Ability to work autonomously and participate in code reviews.

Responsibilities

• Develop and maintain scalable backend services for banking products.
• Modernize legacy systems and adopt modern Java practices.
• Ensure quality through automated testing and code reviews.
• Collaborate with cross-functional teams for secure, reliable solutions.
• Evolve CI/CD processes and delivery standards.
• Adopt AI-powered development tools responsibly.

Skills

Java backend

Java 11+

Spring Boot

REST API

Microservices

JPA/Hibernate

Relational databases

JUnit/Mockito

CI/CD

Git/Maven/Docker

Asynchronous/event-driven

Tools

Apache Kafka

MongoDB

Spring Security

JWT

Hexagonal Architecture

SOLID principles

Testcontainers

Resilience4j

SonarQube

Job description

Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets.

At the core of the role

We are seeking a Semi-Senior Java Developer to join a strategic initiative at one of Argentina's leading financial institutions. In this role, you will contribute to the development and evolution of backend services that support critical banking products and customer experiences. You will work with modern Java technologies, Spring Boot-based microservices, and event-driven architectures, participating in the bank's modernization process, including the migration from Java 8 to Java 21. This is an opportunity to contribute to high-impact systems operating in a highly regulated environment where security, scalability, and reliability are paramount. As part of a collaborative, cross-functional team, you will work closely with Software Engineers, Technical Leads, Product Owners, Quality Assurance Engineers, and Architects to design, implement, test, and maintain robust backend solutions. You will also have the opportunity to contribute to engineering best practices, CI/CD improvements, and the adoption of AI-assisted development tools throughout the development lifecycle.

Core skills you’ll bring

• 4+ years of experience developing backend applications with Java.
• Strong knowledge of Java 11+ (Java 17/21 is highly valued).
• Hands-on experience with Spring Boot and REST API development.
• Experience designing and building Microservices architectures.
• Knowledge of JPA/Hibernate and relational databases (PostgreSQL, Oracle, SQL Server, etc.).
• Experience with testing frameworks such as JUnit and Mockito.
• Understanding of CI/CD practices, Git, Maven, and Docker.
• Experience working with asynchronous processing and event-driven architectures.
• Ability to work autonomously and contribute to technical discussions and code reviews.

Nice-to-have

• Experience with Apache Kafka and messaging-based architectures.
• Knowledge of MongoDB or other NoSQL databases.
• Experience with Spring Security and JWT-based authentication.
• Understanding of Hexagonal Architecture and SOLID principles.
• Experience in Banking, Fintech, Payments, or other regulated industries.
• Knowledge of Resilience4j, SonarQube, Testcontainers, or similar engineering tools.
• Experience using AI-assisted development tools such as GitHub Copilot, Cursor, or ChatGPT.
• Exposure to Java 21 features and modernization initiatives.

The impact you'll create

• Develop and maintain scalable backend services that support critical banking products and operations.
• Contribute to the modernization of legacy systems and the adoption of modern Java development practices.
• Ensure software quality through automated testing, code reviews, and engineering best practices.
• Collaborate with cross-functional teams to deliver secure, reliable, and high-performing solutions.
• Participate in the evolution of CI/CD processes and software delivery standards.
• Help drive innovation through the responsible adoption of AI-powered development tools and modern engineering practices.

People are at the core of Avenga. We provide equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to a respectful environment where everyone can be themselves, share their ideas, and feel that they belong.