Senior Fullstack Developer (AdTech)

TL;DR

Senior Fullstack Developer (AdTech): Building and optimizing large-scale advertising technology platforms with an accent on high-load data processing and programmatic bidding logic. Focus on designing scalable backend services in Java and NestJS, developing modern Angular interfaces, and ensuring system reliability through clean architecture and observability.

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

Company

A large-scale advertising technology company building audience intelligence and campaign automation tools for global digital channels.

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 publisher management and reporting.
• Improve system observability through logs, metrics, and tracing.
• Participate in architectural decisions and technical design reviews.

Requirements

• 5+ years of experience in enterprise web development and distributed systems.
• Strong proficiency in Java (Spring Boot) and Node.js (TypeScript/NestJS).
• Experience with modern UI frameworks like Angular.
• Solid understanding of REST APIs, async processing, and clean architecture.
• Experience with databases including MySQL, Redis, and Elasticsearch.
• Must be based in Warsaw, Serbia, or Romania.

Nice to have

• Experience with Vertica.
• Experience with Vue or React.

Culture & Benefits

• Opportunity to work on high-load systems processing vast data volumes.
• Focus on best practices in system design and AI-assisted development.
• Professional growth in a global AdTech environment.