Senior Full Stack/Web Performance Engineer

Location: Poland (Remote/Flexible)

We are: 

RTB House is a global company that provides state-of-the-art marketing technologies for top brands and agencies worldwide. Our proprietary ad-buying engine is the first in the world to be powered entirely by Deep Learning algorithms, enabling advertisers to achieve outstanding results and meet their goals at every stage of the funnel.

The Bidding Platform organization is the core of the RTB business, processing over 20 million requests per second to participate in real-time auctions and display advertisements to customers from 90+ countries. The Ad Display Team, which the job advert relates to, will be a new team sitting within the Bidding Platform, and will focus on ensuring the seamless, high-quality, and reliable display and tracking of our advertisements. If you want to work on technically complex and demanding solutions, this is the opportunity for you! 

You will:

• Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics.
• Implement and maintain high-quality frontend and full-stack solutions for displaying Ads globally, focusing on extreme performance and scalability.
• Develop monitoring systems (RUM and Synthetic) to track crucial metrics like reliability or viewability and use data to diagnose and resolve performance bottlenecks.
• Collaborate closely with Ads Layouts specialists and backend engineers to ensure smooth data flow and optimal architectural alignment for performance-critical features.
• Write, test, and deploy robust, efficient, and well-documented code in JavaScript/TypeScript/Python/Java, ensuring adherence to the highest coding and performance standards.
• Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews.

Requirements:

• 8+ years of hands-on experience in software engineering, including the understanding of Frontend Development and its internal mechanisms.
• Practical experience and strong understanding of Web Performance optimization techniques and advanced loading strategies (caching, asset delivery).
• Solid proficiency in JavaScript/TypeScript and modern frameworks like e.g., React. Experience with relevant build tooling (e.g., Webpack, Vite).
• Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others).
• Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it).
• Good understanding of full-stack concepts, including working with backend APIs (Node.js, Python, or Java) and deployment/CI/CD pipelines.
• C1 level in English and Polish.

Nice to have:

• Experience in the AdTech/Real Time Bidding space.
• Experience contributing to Real User Monitoring (RUM) systems.

Selected technologies used: 

You will be working within a modern stack that includes JavaScript/TypeScript, React, Node.js, Python, and Java.

We Offer:

• Projects focused on extreme performance and high code quality – solid code reviews are our standard.
• Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers).
• Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses).
• Flexible working conditions – no core hours, fully remote cooperation possible.

Apply now!

You don't need to tick every box to apply. If you are passionate about software engineering or web performance, send us your CV, and we'll review it.