Senior Backend Engineer( AdTech)

Sigma Software · Warsaw, Masovian Voivodeship, Poland · Remote

About Sigma Software

Strong hiring record · median 38 days open

Hiring signal

Posted 3 days ago · still listed on the employer's own board · How we score

All reasons

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