Forward Deployed Site Reliability Engineer - TS/SCI (Full Scope Poly)

Twenty, Chantilly, VA

The role

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.

What you need

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.

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.

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

Forward Deployed Site Reliability Engineer - TS/SCI (Full Scope Poly)

The role

Forward Deployed Site Reliability Engineer - TS/SCI (Full Scope Poly)

The role

What you need

Who you are

Must have

Security requirements

Nice to have

Reliability engineering

Observability & incident response

Deployment & infrastructure operations

Customer liaison & engineering feedback

What's on the table

About Twenty

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Company facts

Twenty