TL;DR

Senior Java and Kotlin Engineer (AdTech): Building a unified, scalable ads platform by transforming a legacy business application into a modular monolith with an accent on hexagonal architecture and Domain-Driven Design principles. Focus on refactoring legacy code, ensuring clean, testable, and scalable high-performance services in a cloud environment.

Location: Hybrid (Multiple locations)

Company

%hirify_global% is a global technology company with 6000+ specialists providing a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and UI design, managed services, product development, and software development.

What you will do

Work with modern Java (17+) and Kotlin on a unified, scalable ads platform.
Collaborate on refactoring legacy code with a focus on quality and maintainability.
Write clean, testable code following SOLID and Clean Code principles.
Create and maintain unit and integration tests.
Cooperate with the frontend team to define API contracts.
Share knowledge within a team of 4 backend developers and take ownership of your work.

Requirements

Strong experience with modern Java & Kotlin.
Expertise in REST APIs and various authentication workflows (key-based, OAuth).
Knowledge of relational (PostgreSQL preferred) and non-relational databases (MongoDB preferred).
Cloud development skills (GCP preferred).
Experience with Docker.
Familiarity with ETL processes, large data volumes, and streaming (Kafka or similar).
Ability to build scalable, high-performance services in a cloud environment.
English on C1 level.

Nice to have

Experience with Kubernetes.
Experience integrating with Meta and TikTok.
AdTech experience.

Culture & Benefits

Equal opportunities in recruitment, career development, and leadership regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic.
Commitment to fostering a work environment where a diverse community of employees, candidates, and business partners actively shapes growth.
Workplace where everyone feels free to be themselves while honoring the boundaries of others.

Hiring process

Submit your application.
Application review by the team.
Talent Acquisition Interview.
Technical Interview.
Customer Interview (for some roles).
Job Offer.
Welcome to the team.