Middle Java Engineer (Kotlin)

This is us

At Avenga, we believe that human creativity empowers technology that matters. Operating globally, our 6000+ specialists provide a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and Ul design, managed services, product development, and software development.

This is the job

We are looking for Middle Java Engineer with strong knowledge in Java and Kotlin, available for minimum 50%. The goal is to build a unified, scalable ads platform.

We are transforming a long-standing business application into a modern technology stack. Our goal is to build a modular monolith designed for scalability and future microservices separation. We follow hexagonal architecture and Domain-Driven Design (DDD) principles to ensure clean, maintainable solutions.

This is you

A Java Developer with strong experience in modern Java (Java 17+, ideally Java 21)
Experience in modern Kotlin
Skilled in working with REST APIs
Knowledge of relational databases (PostgreSQL preferred) and non-relational databases (MongoDB preferred)
Ability to work with diverse API authentication workflows (API keys, OAuth tokens)
Strong cloud development skills (any cloud, GCP preferred)
Experience with Docker; Kubernetes knowledge is a plus
Experience building scalable, high-performance services in a cloud environment
Experience with ETL processes, large data volumes, and reporting
Familiarity with tools used on the project: Kafka, BigQuery, Spark, Dataflow
AdTech background
English: Upper-Intermediate

Nice to have

Experience with DSP solutions
Knowledge of hexagonal architecture and Domain-Driven Design
Experience working with legacy code and performing structured refactoring
Ability to write clean, testable code (SOLID, clean code, unit & integration tests)
Strong communication skills and readiness to propose improvements
Ability to collaborate with a cross-functional team and share knowledge

This is your role

Developing backend features using a modern technology stack: Java 21, Spring Boot 3.4, Hibernate, Microsoft SQL Server, Elasticsearch, Docker, OpenAPI, Modular monolith architecture (early stage), moving toward microservices
Working with legacy code and performing meaningful refactoring
Writing readable, maintainable, testable code
Creating unit and integration tests
Collaborating with the front-end team to define and evolve API contracts
Participating in architectural discussions and suggesting improvements
Working within a backend team (currently 4 developers), sharing knowledge, and taking responsibility for solutions

At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others.

Middle Java Engineer (Kotlin)

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