Staff Frontend Engineer / Web Performance Architect

Back to jobs Staff Frontend Engineer / Web Performance Architect Warsaw, Masovian Voivodeship, Poland Apply Location: Poland (Remote) 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 is an important area of that platform, which we now seek Staff Frontend Engineer for. The job will be to lead (technically) the design and implementation of frontend and full-stack architectural solutions that will guarantee the seamless, high-quality, and reliable display of our advertisements. The position is to collaborate closely with the Ad Display team, and across multiple other functional and platform teams within the Bidding Platform and beyond. The position will be reporting either to one of the Bidding Platform Sr.Managers or directly to the Bidding Platform Director. You Will: Design and lead implementation of a frontend and full-stack architectural solutions that guarantee extreme performance, scalability, observability for displaying Ads world wide. Optimize “Core Web Vitals” metrics, driving significant, measurable improvements in critical user performance metrics (LCP, INP/FID, CLS) for ad rendering and display. Provide Hands-On Technical Leadership. Serving as the senior technical authority, solving the most complex system challenges, proactively addressing bottlenecks, and ensuring the implementation of the highest coding standards. Architect and oversee advanced monitoring (RUM and Synthetic) systems to track crucial metrics like reliability, viewability, and latency at massive scale, providing deep debugging insights for ad creation teams. Establish and evangelize on technical standards, tooling, and deployment methodologies (A/B testing, Canary deployments) across teams, while providing technical mentorship to elevate the skills of other engineers in performance and architecture. Work intensely with Ads Layouts teams (designers, graphic specialists) and core Bidding Platform backend teams to ensure architectural alignment and optimal data flow for performance. Desired Experience: 12+ years of hands-on software engineering experience, specialising in at least one area out of: Web Performance, RUM, Frontend Architectures, including at least 2-3 years spent in a Principal or Staff Engineer level (technical leadership path). Architectural Expertise: Proven track record of designing, maintaining, and evolving scalable frontend and full-stack architectures for high-scale systems (millions of users/requests). Web Performance Architect: Deep and practical expertise in optimizing Core Web Vitals and advanced loading techniques (caching strategies, Service Workers, Edge Computing/CDN utilization). JavaScript/TypeScript Mastery: Expert proficiency in the JavaScript/TypeScript ecosystem and modern frameworks (e.g., React), including build tooling (e.g., Webpack, Vite) and optimization. Data-Driven Optimization: Proven strong analytical thinking and experience using Real User Monitoring (RUM) and synthetic tools to diagnose and solve complex performance issues. Nice to Have: Experience in the AdTech/Real Time Bidding space or in developing Real User Monitoring systems. Experience influencing projects that span multiple platforms (Web, Mobile, CTV). Selected Technologies: You will have the autonomy to select the best tools for the job, with the current stack including modern technologies across JavaScript/TypeScript, React, Node.js, Python, 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 where your architectural vision will be critical (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 digital marketing, send us your CV, and we'll review it. Apply for this job * indicates a required field First Name* Last Name* Email* Phone Country Phone Resume/CV* Attach Attach Dropbox Google Drive Enter manually Enter manually Accepted file types: pdf, doc, docx, txt, rtf LinkedIn Profile Do you have the right to work in the location in which this role is based?* Select... Country* Select... Current Company* Current Job Title * Data Privacy Notice * Select... Dear Candidate, When you apply to a job on this site, the personal data contained in your application will be processed by the company of the RTB House corporate group for which a given recruitment process is conducted. For details, please click on the relevant link below based on the localization of the entity publishing the job post. 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