Middle Fullstack Developer (AdTech)

TL;DR

Middle Fullstack Developer (AdTech): Building and maintaining end-to-end AdTech platform solutions with an accent on Java/Spring Boot backend services and Angular frontend applications. Focus on designing scalable APIs, implementing bidding logic, and ensuring high performance for customer-facing dashboards.

Location: Must be based in Warsaw, Serbia, or Romania

Company

A leading AdTech company providing innovative data-driven advertising solutions for brands, agencies, and publishers worldwide.

What you will do

• Own the end-to-end development process from design to production.
• Design and implement scalable backend services using Java (Spring Boot) and NestJS.
• Develop and maintain modern frontend applications using Angular.
• Build RESTful and event-driven APIs for bidding logic and reporting.
• Conduct research on core technologies and external API integrations.
• Write high-quality, testable code and improve system observability.

Requirements

• Must be based in Warsaw, Serbia, or Romania.
• 4+ years of experience in enterprise web application development.
• Strong proficiency in Java (Spring Boot) and relational/non-relational databases.
• Experience with modern UI frameworks like Angular.
• Solid understanding of REST APIs, async processing, and clean architecture.
• BSc in Computer Science or equivalent.

Culture & Benefits

• Work in a fast-paced, technology-driven environment.
• Opportunity to work on large-scale products processing vast amounts of data.
• Focus on innovation, collaboration, and technical ownership.
• Continuous investment in cutting-edge technologies.