{"id":3451793,"url":"https://alion.io/job/sigma-software-group-senior-backend-engineer-adtech","title":"Senior Backend Engineer( AdTech)","company":{"id":6266,"name":"Sigma Software Group","domain":"sigma.software","url":"https://alion.io/company/sigma-software-group","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":["PL"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":57000,"max_usd":93000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":233},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Cloudflare","optional":false},{"name":"JavaScript","optional":false}],"status":"live","first_seen_at":"2026-10-29T10:54:35Z","employer_posted_date":"2026-10-29","last_verified_at":"2026-10-31T17:54:30Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"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.\nPROJECT\nYou 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.\nThe 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.\n Take end-to-end ownership of the Vast Gateway service\nMaintain, develop, and extend platform functionality\nDesign and implement scalable Back-end solutions for high-load environments\nSupport onboarding of new clients, including integrations, monitoring setup, troubleshooting, and optimization\nBuild custom features and integrations based on Customer requirements\nMonitor system performance and proactively identify optimization opportunities\nEnsure service reliability, availability, and low-latency performance\nParticipate in release planning, deployments, and production support activities\nImprove observability through monitoring, alerting, and operational tooling\nCollaborate with Product and engineering stakeholders to evolve platform architecture\n 5+ years of commercial Back-end development experience\nStrong expertise in server-side JavaScript or other Back-end technologies\nCommercial experience in AdTech environments\nProven experience supporting production systems in high-load environments\nStrong understanding of debugging, monitoring, hotfixing, and zero-downtime deployments\nSolid knowledge of HTTP protocols, web fundamentals, HTML, and tracking pixels\nExperience building scalable and highly available distributed systems\nStrong analytical and problem-solving skills\nAbility to independently own services and drive technical improvements\nUpper-Intermediate English level or higher\nStrong communication and collaboration skills in distributed teams\nWILL BE A PLUS\nExperience with VAST protocol\nHands-on experience with Cloudflare Workers\nExperience with VPAID creatives\nBackground in video advertising technologies\nExperience with high-load distributed systems\nPerformance optimization expertise\nExperience with edge-computing architectures\n PERSONAL PROFILE\nAnalytical and data-driven mindset\nStrong ownership mentality\nProactive approach to identifying issues and improvement opportunities\nComfortable working autonomously in a high-responsibility role\nDetail-oriented with a focus on reliability and quality\nStrong troubleshooting and decision-making skills","description_format":"text","description_chars":3123,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"Upper-Intermediate (B2)","optional":false}]},"benefits":[],"hiring_locations":[{"name":"Poland","iso":"PL","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Sales & Marketing","IT Outsourcing & Dedicated Teams","Custom Software Development"],"lifecycle":[{"event":"open","at":"2026-10-29T11:27:59Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring 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