We are looking for a Senior Frontend Developer (Angular) to join our Warsaw team. The role is on-site and requires working from the office.

✅ Requirements:

✅ Would be a plus:

✅ Responsibilities:

✅ We offer excellent benefits, including but not limited to:

❗️ Important – On-Site Role in Poland, Warsaw❗️
⚡ We are looking for an experienced Senior HTML/Markup Developer to join our development team in Lisbon and help build and style high-quality iGaming websites. You will play a key role in crafting visually engaging and responsive interfaces by focusing on markup and CSS styling, turning Figma designs into fully functional, high-performance web experiences.

🎯 Your Mission:
Contribute to the creation and customization of new iGaming brand websites. You will be responsible for translating design specifications into pixel-perfect, responsive layouts while ensuring consistency, performance, and maintainability across multiple platforms. Collaboration with designers, developers, QA, and product teams will be central to your role.

✅ Responsibilities:
• Set up and customize new brand websites based on design specifications
• Implement and style interfaces following Figma layouts and branding guidelines
• Work closely with designers to fine-tune and resolve design nuances
• Customize and style key website components, including login and registration pages, dashboards, game halls, sports pages, and navigation elements
• Update and manage core framework versions across brands
• Ensure code quality through code reviews and release management
• Support live brands, handling styling updates, fixes, and feature rollouts
• Collaborate with cross-functional teams to deliver seamless user experiences
• Introduce creative ideas and contribute to continuous improvements in design implementation and performance

✅ Requirements:
• 5+ years of professional experience as an HTML/Markup Developer
• Excellent knowledge of HTML (Pug) and CSS (SCSS)
• Strong understanding of UI/UX design principles, responsive design, and cross-browser compatibility
• Proven experience building adaptive layouts and maintaining pixel-perfect visual quality across devices
• Solid knowledge of CSS/JS animations, transitions, and motion best practices
• Experience working with Figma / Sketch / Photoshop for translating design systems into production-ready interfaces
• Familiarity with CSS preprocessors (Sass/Less) and version control tools such as Git
• Understanding of web performance optimization and accessibility standards
• Strong collaboration skills with designers, QAs, and developers in multi-brand or large-scale environments
• Attention to detail, with an eye for visual precision and consistency
• Intermediate or higher level of English

✅ Nice to Have:
• Experience with frontend build tools (Gulp, Webpack, etc.)
• Knowledge of template engines (Pug, Handlebars, etc.)
• Experience working with CSS frameworks (Bootstrap, Tailwind, etc.)
• Understanding of HTML email templates
• Familiarity with Canvas API, WebGL, ThreeJS, or GSAP for advanced visual effects
• Basic knowledge of Angular (for integration purposes only)

✅ Recruitment Process:

1. Interview with the Recruiter: An introductory conversation to get to know you better, discuss your background, and align expectations about the role and the company.
2. Technical Assessment (HackerRank): A short coding challenge designed to evaluate your technical skills and problem-solving abilities.
3. Technical Interview: An in-depth discussion about your technical expertise, hands-on experience, and approach to solving real-world problems.
4. Final Interview with the Hiring Team: A conversation with team members and leadership to assess cultural fit, collaboration style, and alignment with the team’s goals.
5. Offer: If everything goes well, we’ll move forward with a formal offer to join our team.

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 – clean code and solid code reviews are our standard.
• Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers).
• Access to modern technologies and the opportunity to apply them in large-scale, high-impact projects.
• Cooperation based on B2B contract.
• You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow.

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.

We're looking for JavaScript/TypeScript Game Developer

✅Area of responsibilities: