Who We Are Finance leaders choose Billtrust to get paid faster, control costs, and maximize customer satisfaction. As the leader in B2B accounts receivable workflow and payment software, we provide the world’s leading brands with AI-powered solutions across the full AR lifecycle—from invoice presentment and payment processing to cash application and collections. With over 2,600 global customers, more than $1 trillion in invoice dollars processed, and a proprietary network of 13 million buyers, Billtrust delivers business value through deep industry expertise and a culture relentlessly focused on meaningful customer outcomes. We’re an AI-first company, not just in what we build for our customers, but in how we work. Across every function, our teams use AI tools daily to work faster, make better decisions, and deliver higher-quality outcomes. We hire exceptional people, give them cutting-edge AI capabilities, and measure success by the impact they create. If you want to do the best work of your career at the frontier of AI and fintech, Billtrust is the place to do it. Our Values Customers We relentlessly increase value for customer and do the right thing for them. Action We make ‘thoughtfully fast’ decisions, act quickly, cut through red tape, deliver progress not perfection, take ownership and accountability. Team Spirit We put the team ahead of ourselves, foster trust and respect, collaborate with passion, despise toxic politics, value our differences, and celebrate together. Innovation We challenge the status quo, experiment thoughtfully, and are novel and brilliant in what we create. Excellence We love to win, but we hate losing even more. We aspire to be the best and take pride in our work. When we fall short, we own it and come back stronger. Security Engineer As a Security Engineer within our Operations Engineering Center, you'll protect Billtrust's infrastructure and applications through SOC operations, threat detection, and DevSecOps practices. You'll manage our SIEM AI platform (GreyMatter AI), respond to security incidents, and integrate security controls into our CI/CD pipelines. You'll engineer AI-powered threat hunting agents, autonomous security playbook execution, and intelligent vulnerability assessment systems. Your work will safeguard billions of dollars in transactions while pioneering the use of AI and autonomous agents in security operations and threat response Key Responsibilities: * Manage Security Information and Event Management (SIEM) platform operations using GreyMatter AI * Perform threat detection, alert triage, and incident response coordination * Engineer AI SIEM correlation engines and autonomous alert resolution systems * Develop intelligent threat hunting agents using LLM and machine learning techniques * Build and maintain security playbooks for incident response and automated remediation * Implement vulnerability scanning and assessment across applications and infrastructure * Develop container security practices and image scanning within CI/CD pipelines * Implement DevSecOps practices: secure code analysis, dependency scanning, compliance automation * Manage cloud security controls (AWS WAF, Azure Sentinel, IAM) * Create LLM-powered vulnerability assessment and remediation automation tools Required Qualifications Experience & Technical Background * 5+ years of hands-on experience in security engineering, SOC operations, or DevSecOps * Demonstrated expertise in SIEM platform management and security event correlation * Strong background in threat detection, incident response, and threat intelligence * Experience with vulnerability scanning and management tools * Hands-on knowledge of cloud security (AWS Security Hub or Azure Sentinel) * Familiarity with CI/CD security scanning and DevSecOps practices * Strong understanding of network security, firewalls, and traffic analysis * Proficiency in at least one programming/scripting language (Python, Go, Bash preferred) * Proficiency using Claude Code, GitHub Copilot or similar AI coding assistance Soft Skills & Attributes * Strong analytical and investigative mindset for threat analysis * Excellent communication skills, especially during security incidents * Detail-oriented with high attention to security controls and compliance * Ability to work in high-pressure environments during active security incidents * Commitment to continuous learning on emerging security threats and technologies