Infrastructure Software Engineer, Core Platform

Lumbra•Arlington, VA

1d•Onsite

About The Position

Lumbra is building Nebula, an agentic harness running as a set of microservices on managed Kubernetes, backed by managed databases, caching, and workflow orchestration, all provisioned with OpenTofu and deployed with Helm via CI/CD. We currently run on GCP but are not wed to any single provider. We're looking for an infrastructure engineer to own the reliability, scalability, and developer experience of the harness across dev, demo, and production environments.

Requirements

Strong IaC skills and experience with GCP (or equivalent) are essential.
You need deep Kubernetes knowledge, not just manifest authoring.
Experience with Helm inheritance patterns and chart libraries is important.
You should be comfortable authoring and debugging complex pipeline configurations.
Experience instrumenting distributed systems and building actionable dashboards is needed.
Understanding of zero-trust patterns and secrets management at scale is essential.
Solid networking fundamentals are a must.
You care about measurable improvements and treat sluggish infrastructure as a bug, not a tradeoff.

Nice To Haves

Experience operating Temporal or similar workflow orchestration systems in production
Familiarity with graph databases (Neo4j) and object storage (MinIO, S3-compatible) on Kubernetes
Experience with Keycloak or similar identity providers: administration, realm configuration, and OIDC management
Background in cloud cost optimization : committed use discounts, node pool right-sizing, spot instances
Familiarity with GitOps patterns (ArgoCD, Flux) as an evolution from push-based CI/CD
Understanding of public key infrastructure : certificate management, mTLS, CA hierarchies, and trust chain validation
Experience with hybrid networking between cloud and on-prem environments

Responsibilities

Author and maintain Infrastructure as Code (OpenTofu/Terraform) modules for cloud resources including networking, managed Kubernetes clusters, databases, caching, and container registries.
Design and manage Kubernetes cluster configurations including node pool autoscaling, workload identity, private connectivity for database access, and network policies.
Build and optimize Helm charts for a shared service template consumed by multiple services, managing environment-specific overrides across dev, demo, staging, and production.
Own the CI/CD pipeline architecture : multi-stage builds, conditional triggers based on file-change detection, and deployment orchestration.
Implement and maintain the observability stack (metrics, traces, logs) across all services using Grafana, Prometheus, and OpenTelemetry.
Manage secrets lifecycle and credential rotation with automated syncing to Kubernetes, plus identity provider configuration.
Configure and maintain production networking including load balancing, TLS termination, DNS, and authentication proxies.
Optimize the container build pipeline for speed and security: multi-stage builds, layer caching, image hardening, and size reduction for faster, safer deployments.
Continuously profile and optimize platform performance : query latency, pod startup times, resource utilization, and network throughput.
Maintain developer experience tooling including local development environments, task automation, and environment bootstrapping that lets engineers go from clone to running system quickly.

Benefits

Comprehensive medical, dental, and vision plans
Premiums 100% covered by Lumbra for all employees
Exceptionally low premiums for spouses and dependents
Basic life insurance and disability 100% covered for all employees by Lumbra
Option to purchase additional life insurance available
Take the time off that you need, when you need it' paid time off, not accrual based
Generous company holiday calendar including a holiday shutdown in December
Supportive leave of absence program including time off for military service, medical events, and parental leave
Full 401(k) retirement plan for all full-time eligible employees
Company-funded commuter benefits
Free access to on-site gym at office