Forward Deployed Site Reliability Engineer (TS/SCI Required)

Forward Deployed Site Reliability Engineer (TS/SCI Required) Twenty Software Engineering Arlington, VA, USA Posted on May 5, 2026 Apply now Location Arlington, VA Employment Type Full time Location Type On-site Department Engineering About the Company At Twenty, we're taking on one of the most critical challenges of our time: defending democracies in the digital age. We develop revolutionary technologies that operate at the intersection of the cyber and electromagnetic domains, where the speed of operations exceeds human sensing and complexity transcends conventional boundaries. Our team doesn't just solve problems - we deliver game-changing outcomes that directly impact national security. We're pragmatic optimists who understand that while our mission of protecting America and its allies is challenging, success is possible. Role Summary You'll be our eyes, ears, and hands on the ground at a government customer site, ensuring the reliability and performance of Twenty's mission-critical platform running in a restricted, air-gapped AWS environment. This role sits at the intersection of deep technical ownership and customer-facing engineering: you'll define how we measure reliability, lead incident response in a constrained environment, and serve as the primary technical link between what's happening on-site and the engineering team back in Arlington. You'll work closely with the DevSecOps engineer to ensure the platform operates within government security and compliance requirements, and with product engineers to translate operational reality into actionable feedback. You'll report directly to the VP of Engineering. If you thrive operating with autonomy in high-stakes environments and find satisfaction in making complex systems provably reliable, this role is for you. Who You Are You own reliability outcomes, not just uptime dashboards — you define what "healthy" means and hold the system to it. You're as comfortable writing a runbook as you are deep in a production incident with limited tooling and no safety net. You operate well with minimal remote support — ambiguity doesn't paralyze you, and you know when to escalate versus when to solve it yourself. You build trust naturally with external stakeholders, including government customers, and can translate complex technical situations into plain language under pressure. You treat toil as a bug: if you're doing something manually more than twice, you automate it. You communicate with precision — your incident reports and runbooks are read by people who weren't in the room, and they need to be right. You understand that in a restricted environment, you are the feedback loop — and you take that responsibility seriously. What You'll Do Reliability Engineering Define, track, and report on SLIs and SLOs for platform services running in the customer environment. Use error budgets to drive reliability conversations with the Arlington engineering team, translating operational data into prioritized engineering work.

Identify and eliminate toil:

build automation for repetitive operational tasks within the constraints of the secure environment. Conduct post-incident reviews, own root cause analysis, and drive durable fixes in partnership with the engineering team. Observability & Incident Response Own the observability posture for the on-site deployment — dashboards, alerting thresholds, and log pipelines using the LGTM stack (Grafana, Loki, Tempo, Mimir).

Lead incident response on-site:

triage, containment, coordination with Arlington, and customer communication. Maintain and continuously improve runbooks for operational procedures and emergency response protocols. Serve as the on-call anchor for the customer environment, with clear escalation paths to the engineering team. Deployment & Infrastructure Operations Work with the customer deployment team to get Twenty's platform stood up and updated within the restricted environment. Manage containerized services (Docker, Docker Compose) across deployment lifecycle — configuration, updates, rollbacks. Apply and validate Terraform-based infrastructure changes within the enclave, in coordination with the DSO engineer who owns IaC policy and guardrails. Perform capacity planning and flag scaling requirements to the Arlington team before they become incidents. Customer Liaison & Engineering Feedback Serve as the primary technical interface between the government customer and Twenty's engineering team — translating operational requirements, constraints, and issues in both directions. Represent the operational environment accurately in engineering discussions: what the team in Arlington can't see, you make visible. Partner with the DevSecOps engineer on compliance, logging, and audit requirements specific to the customer environment. Provide technical guidance and support to customer stakeholders on system behavior and troubleshooting procedures. Must Have 5+ years of professional experience in site reliability engineering, production operations, or a closely related infrastructure role. Proven experience defining and tracking SLIs, SLOs, and error budgets in a production environment. Hands-on experience with Docker, Docker Compose, and AWS (EC2, ECS, RDS, VPCs, security groups) in production deployments. Solid Linux/Unix systems administration skills; productive in constrained environments where GUI tooling may be limited or unavailable. Experience with Terraform for infrastructure provisioning and configuration, working within DSO-provided policy guardrails. Experience with the LGTM observability stack or equivalent (Grafana, Loki, Prometheus/Mimir, distributed tracing).

Strong incident response experience:

you've led responses, written post-mortems and runbooks, and shipped the preventive fix. Scripting proficiency in Python or Bash for operational automation, with familiarity in Go a plus; experience with PagerDuty or equivalent on-call tooling. Experience working in or directly supporting government or defense environments, including air-gapped or enclave deployments. Nice To Have Experience with NATS or similar pub/sub messaging systems in production. Background in cyber operations, intelligence systems, or signals environments. AWS certifications (Solutions Architect, SysOps, or DevOps Engineer). Security Requirements Must possess and be able to maintain a TS/SCI security clearance with appropriate polygraph U.S. citizenship required Willingness to travel occasionally for customer engagements and operational support If this role sounds like you, apply and share with us your interest. Some positions may require eligibility to obtain a U.S. Government security clearance. Any clearance requirement will be listed in the role description. Twenty is an equal opportunity employer. We consider all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, veteran status, disability, or any other protected status. If you need a reasonable accommodation during the hiring process, let us know and we will work with you. Apply now See more open positions at Twenty