Senior Backend Engineer( AdTech)
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Summary
Senior backend engineer at Sigma Software (outsourcing) owning the Vast Gateway service for an ad-tech client — maintaining, extending, and scaling a high-load video-ads platform, onboarding clients, and ensuring low-latency reliability. Core stack: server-side JavaScript, HTTP/web fundamentals, tracking pixels; Cloudflare Workers a plus.
- 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
