Senior Backend Engineer (AdTech)

Location: Europe, Albania, Poland, Romania, Ukraine, or Latin America

Company

Develops cybersecurity-focused solutions that protect organizations, users, and digital ecosystems from online threats in high-traffic environments.

What you will do

• Take end-to-end ownership of the Vast Gateway service and extend its functionality.
• Design and implement scalable backend solutions for high-load environments.
• Support client onboarding through integrations, monitoring setup, troubleshooting, and optimization.
• Build customer-specific features and integrations and collaborate with Product and Engineering stakeholders on platform architecture.
• Monitor performance, improve observability through alerting and operational tooling, and identify optimization opportunities.
• Participate in release planning, deployments, and production support while ensuring reliability, availability, and low latency.

Requirements

• 5+ years of commercial backend development experience.
• Commercial AdTech experience.
• Expert-level server-side JavaScript or strong expertise in other backend technologies.
• Expert knowledge of HTTP protocols and solid knowledge of web fundamentals, HTML, and tracking pixels.
• Experience supporting production systems in high-load environments and building scalable, highly available distributed systems.
• Strong understanding of debugging, monitoring, hotfixing, and zero-downtime deployments.
• Strong analytical, problem-solving, troubleshooting, communication, and collaboration skills.
• Ability to independently own services, drive technical improvements, and work autonomously in a high-responsibility role.
• Upper-Intermediate English level or higher.

Nice to have

• Experience with VAST protocol, VPAID creatives, video advertising technologies, or Cloudflare Workers.
• Experience with high-load distributed systems, performance optimization, or edge-computing architectures.

Culture & Benefits

• Work in a distributed team with strong communication and collaboration expectations.
• Operate autonomously with a strong ownership mindset and focus on reliability, quality, and proactive improvement.
• Work on a high-throughput edge proxy handling tens of millions of requests per day in the video advertising delivery flow.