Senior Java and Kotlin Engineer (AdTech)

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.