Security and Infrastructure Engineer

About Us Ada is an AI customer service company whose mission is to make customer service extraordinary for everyone. We're driven to raise a new standard of quality customer service at scale, enabling enterprise companies to deliver experiences that people love–instant, proactive, personalized, and effortless. Ada is an AI transformation platform and partner—combining strategic expertise with powerful AI agent management technology to accelerate businesses’ AI maturity to keep them ahead of the curve. With Ada, 83% of customer conversations—and counting—are effortlessly resolved through automation, giving teams more time back, companies more resources to focus on growth, and customers more life to focus on what matters most to them. Established in 2016, Ada is a Canadian company that has powered over 5.5 billion interactions for leading brands like Square, YETI, IPSY, and Monday.com , saving millions of hours of human effort. Backed with over $250M in funding from tier-one investors including Accel, Bessemer, FirstMark, Spark, and Version One Ventures, Ada is a pioneer in the management and application of AI in customer service. At Ada, we see growth as a reflection of each individual owner’s personal growth. That’s why our values are rooted in driving progress and continuous improvement. If you’re ambitious and eager to grow, Ada could be the place for you. Learn more at  www.ada.cx . Engineering at Ada As an Ada engineer, you'll have the autonomy to make a huge impact and the opportunity to work alongside talented peers who challenge and inspire you. We move fast, take ownership, and always strive to improve, both as individuals and as a team. As a Security Infrastructure Engineer on Ada's Security Operations team, your work will have a fundamental impact on Ada's growth: our customers put an AI agent in front of their customers, and it has to be trustworthy by construction. Our Role We are looking for a Security Infrastructure Engineer to own cloud and platform security end to end, architecture, detection and response, and platform enablement across AWS and Azure, including the security of our agentic AI platform. This role is not focused on ticket-driven security work: you will replace manual security work with platform capabilities, build guardrails into the product itself, and set the security bar across Product Development. You will operate with a high degree of autonomy, set technical direction that other senior engineers follow, mentor security engineers, and act as the senior technical counterpart to engineering and security leadership translating risk and compliance requirements into concrete engineering solutions. About You 8+ years of experience in cloud, infrastructure, or security engineering roles, including experience setting technical direction across multiple teams, not just executing within one. Deep hands-on experience with at least one major cloud provider, preferably AWS; Azure experience is a plus. Strong experience designing and securing cloud IAM, networking, secrets management, and distributed systems at scale. Extensive experience with infrastructure as code (Terraform or CloudFormation) and policy as code; you default to automation and preventative controls over manual review. Experience building or operating detection and response systems including SIEM, CSPM/CIEM, and cloud security monitoring. Experience with or a strong point of view on securing LLM and agentic AI systems: guardrails, safe tool use, and failure isolation. A track record of turning recurring security and infrastructure requests into self-serve tooling, retiring ticket queues rather than staffing them. Proven ability to translate compliance and risk requirements into technical implementations. Strong communicator who can influence architecture and engineering decisions across teams, and mentor senior engineers through design reviews and hands-on guidance. Comfortable operating independently, owning long-term technical initiatives, and carrying a share of security-relevant on-call. What You Will Do Cloud Security Architecture & Engineering Architect, design, and operate security technologies across cloud, network, identity, endpoint, and application layers in public, private, and hybrid environments. Define cloud security reference architectures, threat models, and guardrails aligned with zero trust and least privilege principles. Own the technical lifecycle of security tooling including cloud-native security services, SIEM, CSPM, CIEM, EDR, DLP, and vulnerability management platforms. Agentic Platform Security Build safety guardrails into the platform itself so failures like an agent bypassing a playbook safeguard cannot reach a customer. Partner with the Reasoning Engine and Playbooks teams on agent behavior that is safe by construction. Set the security bar inside Product Development: secure-coding standards, review practice, and threat modeling