Senior Platform Engineer, Security

Back to jobsSenior Platform Engineer, SecurityDecagonEngineeringFull-timeOn-siteSan FranciscoPosted on 6/5/2026Job DescriptionAbout DecagonDecagon is the leading conversational AI platform empowering every brand to deliver concierge customer experiences.Our technology enables industry-defining enterprises like Avis Budget Group, Block’s Cash App and Square, Chime, Oura Health, and Hunter Douglas to deploy AI agents that power personalized, deeply satisfying interactions across voice, chat, email, SMS, and every other channel.We’re building a future where customer experiences are being redefined from support tickets and hold music to faster resolutions, richer conversations, and deeper relationships. We’re proud to be backed by world-class investors who share that vision, including a16z, Accel, Bain Capital Ventures, Coatue, and Index Ventures, along with many others.We’re an in-office company, driven by a shared commitment to excellence and velocity. Our values — Just Get It Done, Invent What Customers Want, Winner’s Mindset, and The Polymath Principle — shape how we work and grow as a team.About The TeamThe Security Engineering team at Decagon protects the platform that powers the most advanced conversational AI agents for enterprise customers across voice, chat, email, and SMS. We build the security foundations that enable Decagon's AI agents to handle sensitive customer data with complete trust while defending against sophisticated, AI-enabled threats at massive scale.This role sits at the intersection of Security and Infrastructure. Like the rest of our Infrastructure org, we believe the best security comes from paved paths, strong SLAs, and high-quality systems that other engineers can rely on by default. Our mission is to secure magical support experiences, ensuring that AI agents and human agents can collaborate safely to help users resolve their issues while maintaining the highest standards of security and privacy.About The RoleWe're hiring our founding Platform Engineer, Security to design, build, and operate the security infrastructure that powers Decagon's AI platform. This is a builder's role: you'll spend your time creating durable, well-engineered systems including paved paths for secure service creation, security tooling that automatically applies secure configurations, and infrastructure-as-code that makes it easy for every engineer at Decagon to do the right thing.As the first dedicated engineer at this intersection, you'll have outsized impact on how security infrastructure is built here, and you'll shape the technical direction of the infrastructure security program. You'll also help us invest in automation, observability, and self-service so the team operates with confidence.The work is close to the business. Decagon serves some of the world's most security-conscious enterprises, including major financial-services institutions, and the security platform you build directly unlocks these high-value deals. This role offers a clear runway to grow your impact across security, infrastructure, and platform engineering.In this role, you willDesign and implement secure, multi-tenant infrastructure that isolates customer data while enabling efficient AI model serving across our platformBuild "golden paths" for security including service templates, libraries, terraform policies, and automation, so new services are secure and production-ready by defaultOwn infrastructure-as-code (Terraform) and GitOps best practices, including reusable modules and policy-as-codeExpand and help operate the platforms behind alerting detection, secrets management, IAM, and automated remediation, integrating them cleanly into CI/CD and developer workflowsPartner with Security, Infrastructure, and product engineering teams to translate enterprise and compliance requirements (SOC 2, ISO 27001, GDPR) into reliable, automated technical controlsParticipate in security on-call and continuously raise the bar on operability, runbooks, and incident learningsYour background looks something like this5+ years building and operating production infrastructure, with meaningful exposure to security or a strong interest in moving deeper into security problemsDeep knowledge of Google Cloud Platform and/or AWS, including compute, networking, IAM, and security servicesProficiency with infrastructure-as-code (Terraform, Ansible, or similar) and a track record of building developer-facing tooling and automationStrong coding ability in at least one systems language (eg. Python, Go, TypeScript) and comfort building paved-path tooling teams actually adoptExperience applying AI-assisted tooling (Cursor, Claude Code, and similar) to make engineers dramatically more effectiveExperience with secure container deployment, service mesh, and Kubernetes security best practicesObservability and incident-response tooling experience (instrumentation, alerting, dashboards), with a bias toward eliminating toilClear written communication and the ability to turn ambiguous requirements into simple, reliable designsEven better if you haveA track record of being an early or founding platform/infrastructure/security engineer at another companyExperience building internal platforms: service templates, paved-road deployment, self-serve environments, or developer portalsA security-minded approach to the software supply chain (provenance, secrets, least privilege) and familiarity with static analysis tooling (Semgrep, CodeQL)Experience with detection and response data pipelines (Kafka/Pulsar, Splunk/Panther/RunReveal, or similar)Knowledge of enterprise compliance requirements (SOC 2, ISO 27001, GDPR) from an infrastructure and platform perspectiveCompensation$200K – $330K + Offers EquityBenefitsWe proudly offer the following benefits for our full-time employees:Take what you need vacation policy (subject to local requirements; UK employees receive 25 days of statutory leave)Medical, Dental, and Vision benefits for you and your familyLife Insurance and Disability BenefitsRetirement Plan (e.g., 401K, pension)Parental LeaveFertility and family building benefits through CarrotDaily lunches and snacks in the office to keep you at your bestThese benefits are described in more detail in Decagon’s policies, may vary by location, and can change at any time according to applicable compensation and benefits plans.Apply for this position