Senior Full-Stack Engineer (React/Node.js) — Media Products

Project overview

About the Role

We are looking for a Senior Fullstack Engineer to build and own the media format services behind a programmatic advertising platform that serves billions of impressions a year. You will work across the full path of a creative: from video and image ingestion and processing, through APIs, to delivery and rendering inside web players, news sites and e-commerce stores.

Responsibilities

• Design, build and operate media services end to end: ingestion, processing, APIs and production delivery.
• Build low-latency, high-throughput backend services that turn large, noisy, real-world data into value.
• Work hands-on with video and image pipelines, web players and content embedded into third-party interfaces.
• Own production quality: security, monitoring, observability and continuous improvement.
• Collaborate with engineers, product owners and data scientists, and raise the bar for how backend systems are built and run.
• Iterate fast: changes are safely tested against real traffic, and an idea often reaches validation in days rather than weeks.
• Contribute to the next generation of ad products and formats.
• Use modern AI development tooling as a normal part of your daily workflow.

Requirements

• 4+ years of professional software engineering experience, including running production systems.
• Strong Node.js/TypeScript (or a comparable language) with a backend focus.
• Strong React experience. You will build and maintain the customer-facing interfaces around these services, so this is a fullstack role rather than a backend-only one.
• Solid, hands-on AWS experience: ECS/EKS, RDS, SQS, CDK, MediaConvert, CloudFront. You should be able to name the services you have used, explain what you built with them, and be comfortable helping out on the infrastructure side at scale.
• Practical experience with media: video and image processing, media delivery, and embedding web content or players into different interfaces (apps, news websites, e-commerce).
• Experience taking a product from idea to production ownership, including monitoring, iteration and long-term maintenance.
• Strong computer science fundamentals and software engineering best practices.
• Experience building systems that handle structured but skewed and noisy data.
• Experience with AI-enabled development as part of your everyday workflow.
• Based in Europe and comfortable working in an English-speaking, distributed team.

Nice to have

What we offer

• Experience in ad tech or programmatic advertising (real-time bidding experience is not required).
• Real-time or low-latency backend systems.
• Media delivery and format optimization at scale.
• Rust.
• Python.
• Background in a publisher, media or ad-serving company.
• Multisport card.
• Private healthcare.
• Stock options, so you benefit from the success you help build.
• Ownership of media formats end to end, from concept to production.
• Fast feedback loops: services and changes can be tested against real traffic with a low barrier to experimentation.
• Direct impact on advertiser outcomes and company revenue.
• Modern AI tooling as part of your daily engineering workflow.

Project details

• Start: flexible
• Remote: remote
• Location: Kraków, -, PL