Our Customer is a cybersecurity-focused company delivering solutions that help protect organizations, users, and digital ecosystems from online threats. The company develops products for high-traffic environments where reliability, scalability, and security are essential. Their solutions help detect vulnerabilities, ensure secure digital experiences, and protect users from malicious activity across multiple industries.
PROJECT
You will join the team working on Vast Gateway, a high-throughput edge proxy built on Cloudflare Workers and responsible for handling tens of millions of requests per day within the video advertising delivery flow.
The platform retrieves and processes VAST responses, applies modifications including malicious ad protection logic for VPAID creatives, and consolidates multiple VAST documents into a single XML response for video players. Since all advertising traffic flows through the gateway, the system is designed with a strong focus on low latency, high availability, scalability, and operational stability.
Job Description- 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
Skills Required
- 5+ years of commercial backend development experience
- Strong expertise in server-side JavaScript or other backend technologies
- Commercial experience in AdTech environments
- Experience supporting production systems in high-load environments
- Strong understanding of debugging, monitoring, hotfixing, and zero-downtime deployments
- 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
- 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
What We Do
Sigma Software Group, an award-winning and trusted IT partner, has been serving customers for over 21 years, providing comprehensive IT solutions to various businesses, ranging from startups to established software product houses. As one of Europe's substantial IT consultancies, it brings together a dedicated workforce of over 2,100 professionals in 40 offices across 19 countries. With a diverse client base, including more than 300 enterprises, including Fortune 500 stalwarts, Sigma Software Group is a preferred choice for developing solutions that help businesses create cutting-edge products while meeting their unique needs. Sigma Software Group operates as a dynamic ecosystem of tech companies, offering 25 ready-to-implement innovative products and 40+ value-added services. Furthermore, Sigma Software Group is committed to fostering innovation through initiatives such as the Sigma Software Labs business incubator, Sigma Software University, the SID Venture Partners VC Fund, UA Tech Network, Techosystem, the European Business Association, and other collaborative efforts. Since 2015, Sigma Software Group has consistently earned recognition on the IAOP's prestigious World's Top 100 Outsourcing list. The company's accomplishments have also been acknowledged by prominent global media outlets such as Forbes, CNBC, The Times, and Reuters
