Senior Fullstack Developer (AdTech)

TL;DR

Senior Fullstack Developer (Java/NestJS/Angular): Building and optimizing end-to-end AdTech platform services with an accent on scalable backend architectures and high-performance frontend dashboards. Focus on designing event-driven APIs, integrating complex data sources, and implementing AI-assisted development practices.

Location: Warsaw (Poland), Serbia, or Romania

Company

A leading AdTech company developing innovative data-driven solutions and automation tools to help brands and publishers engage audiences across digital channels.

What you will do

• Own the end-to-end development process from initial design to production.
• Design and implement scalable backend services using Java (Spring Boot) and NestJS (Node.js/TypeScript).
• Build RESTful and event-driven APIs for publisher management, bidding logic, and reporting.
• Develop and maintain modern frontend applications using Angular 15+.
• Research core technologies and integrate external APIs and third-party services.
• Ensure system observability through logs, metrics, and tracing while writing high-quality testable code.

Requirements

• 5+ years of experience developing enterprise web applications and distributed systems in production.
• Proficiency in Java (Spring Boot).
• Strong understanding of REST APIs, async processing, and clean architecture principles.
• Experience with relational and non-relational databases (MySQL, Vertica, Redis, Elasticsearch).
• BSc in Computer Science or equivalent.
• Must be based in Poland, Serbia, or Romania.

Nice to have

• Experience with Node.js (TypeScript, NestJS).
• Experience with modern UI frameworks such as Angular, Vue, or React.

Culture & Benefits

• Fast-paced, technology-driven environment where innovation and ownership are highly valued.
• Opportunity to work on large-scale products processing vast amounts of global data.
• Continuous investment in cutting-edge technologies to shape the future of digital advertising.
• Collaborative team culture focusing on technical excellence and best practices.