Senior Backend Engineer( AdTech)

• Take end-to-end ownership of the Vast Gateway service • Maintain, develop, and extend platform functionality • Design and implement scalable Back-end solutions for high-load environments • Support onboarding of new clients, including integrations, monitoring setup, troubleshooting, and optimization • Build custom features and integrations based on Customer requirements • Monitor system performance and proactively identify optimization opportunities • Ensure service reliability, availability, and low-latency performance • Participate in release planning, deployments, and production support activities • Improve observability through monitoring, alerting, and operational tooling • Collaborate with Product and engineering stakeholders to evolve platform architecture • 5+ years of commercial Back-end development experience • Strong expertise in server-side JavaScript or other Back-end technologies • Commercial experience in AdTech environments • Proven experience supporting production systems in high-load environments • Strong understanding of debugging, monitoring, hotfixing, and zero-downtime deployments • Solid knowledge of HTTP protocols, web fundamentals, HTML, and tracking pixels • Experience building scalable and highly available distributed systems • Strong analytical and problem-solving skills • Ability to independently own services and drive technical improvements • Upper-Intermediate English level or higher • Strong communication and collaboration skills in distributed teams WILL BE A PLUS• Experience with VAST protocol • Hands-on experience with Cloudflare Workers • Experience with VPAID creatives • Background in video advertising technologies • Experience with high-load distributed systems • Performance optimization expertise • Experience with edge-computing architectures PERSONAL PROFILE• Analytical and data-driven mindset • Strong ownership mentality • Proactive approach to identifying issues and improvement opportunities • Comfortable working autonomously in a high-responsibility role • Detail-oriented with a focus on reliability and quality • Strong troubleshooting and decision-making skills Our Customer is a cybersecurity-focused company delivering solutions that help protect organizations, users, and digital ecosystems from online threats.