Junior Java Developer (Backend)

TL;DR

Junior Java Developer (Backend): Building and optimizing backend services for an advertising campaign management system with an accent on system architecture, high availability, and horizontal scalability. Focus on designing solutions for massive scale e-commerce, ensuring direct communication with product owners, and collaborating within a cross-functional team.

Location: Hybrid from Warszawa/Gdynia (at least 1-2 days per week from the office)

Salary: 6,000–10,000 PLN per month (estimated)

Company

hirify.global is a Polish outsourcing company that creates highly specialised software development teams for clients globally, including a market-leading e-commerce platform in Poland.

What you will do

• Contribute to managing advertising campaigns, enabling sellers and advertising agencies to create ads.
• Participate in budgeting and advertising billing for advertising campaigns.
• Design solutions with high availability and horizontal scalability.
• Collaborate within a mature, cross-functional team.
• Communicate directly with Product Owners and non-technical stakeholders.
• Have a real impact on system architecture.

Requirements

• Minimum 2 years of commercial experience as a Java Developer (Java 11+, Spring Boot), with mandatory hands-on experience in production environments and microservices architecture.
• Required higher education in a relevant field (or currently in progress).
• Familiarity with messaging systems such as Kafka or RabbitMQ.
• Solid understanding of relational databases (SQL), including indexes, constraints, and transactions (without relying on ORM frameworks).
• Basic understanding of distributed systems and asynchronous communication.
• Experience working with monitoring, logging, and application metrics.

Nice to have

• Kafka
• Kotlin
• Event-driven architecture
• Familiarity with reactive programming concepts

Culture & Benefits

• Opportunity for real impact on system architecture and designing solutions with high availability.
• Collaboration within a mature, cross-functional team with direct communication to Product Owners.
• Contribution to a market-leading Polish e-commerce platform used by over 20 million users.
• Opportunity to tackle software delivery at massive scale with state-of-the-art technologies.
• Proprietary professional development programme and wide range of benefits.
• Support for various charitable and educational initiatives.