Senior / Principal Golang Backend Developer

Company Description Ready to build systems operating at internet scale and fight sophisticated digital fraud in real time? We are looking for a Senior Golang Backend Engineer to join a cross-functional team developing cutting-edge AdTech and cybersecurity solutions. In this role, you will work with high-load distributed systems processing over 1.5 trillion prediction requests daily while collaborating with data scientists, malware analysts, and product experts. You will contribute to building scalable fraud prevention technologies used by major internet companies worldwide. We at Sigma Software offer the opportunity to work on impactful global products, solve complex engineering challenges, and grow alongside experienced professionals in a collaborative and innovation-driven environment. Work format and location are flexible depending on your preferences and project needs. CUSTOMER Our Customer is a global cybersecurity company delivering advanced protection solutions for individuals, organizations, and digital ecosystems. The company specializes in large-scale threat detection, digital risk mitigation, and real-time protection technologies designed to combat sophisticated online threats across multiple industries. PROJECT The project focuses on building a real-time risk assessment platform for the digital advertising ecosystem. The solution helps identify invalid, fraudulent, or low-quality traffic before advertising budgets are spent, enabling automated decision-making in real time. The team develops advanced fraud detection technologies integrated with major AdTech platforms, agencies, and brands. Engineers work closely with researchers and analysts to uncover abuse patterns, reduce sophisticated invalid traffic (IVT), and improve transparency across programmatic advertising systems. Job Description Design, develop, and maintain high-performance backend services in GolangBuild and optimize distributed systems processing trillions of prediction requests dailyCollaborate with data scientists, malware analysts, researchers, and product managersImprove system scalability, reliability, latency, and cost efficiencyDevelop, test, review, deploy, and maintain software across multiple environmentsEnsure software quality through clean architecture and engineering best practicesContribute to backlog prioritization and technical planningDeploy and support services in Kubernetes environmentsInvestigate fraudulent activities and develop new fraud prevention approachesDrive engineering excellence within a collaborative product-oriented team Qualifications 5+ years of commercial software development experienceStrong commercial experience with Golang and backend engineeringStrong Computer Science fundamentals including algorithms, data structures, concurrency, and system designProven experience with high-load distributed systemsExperience with performance tuning, latency optimization, and memory managementHands-on experience with Kubernetes, Terraform, and Helm ChartsGood understanding of DevOps practices and cloud-native deploymentsExperience with SQL databases and large-scale data processingExperience working with AI tools, LLMs, or agent-based systemsProduct-oriented mindset and ability to align technical solutions with business goalsExperience across the full software development lifecycleAbility to design stable, maintainable, and scalable architecturesAvailability to work with flexible hours and maintain 3–4 hours overlap with EST time zoneUpper-Intermediate English level or higher WILL BE A PLUS Experience with Apache AirflowExperience with PythonExperience with SnowflakeExperience in the AdTech domainExperience with C++ Additional Information PERSONAL PROFILE Strong analytical and problem-solving mindsetOwnership mentality and proactive approachAbility to work effectively in a cross-functional environmentPassion for scalable and high-quality systemsAbility to balance technical excellence with business prioritiesComfortable working in a fast-paced product environment