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Millennial Software · 1 day ago

Senior Backend Software Engineer, TS/SCI with CI Poly - $180K-$210K + 15% 401k

Northern Virginia (Multiple Locations)

Full-time

Onsite

Senior Level, Lead/Staff

$180K/yr - $210K/yr

10+ years exp

Millennial Software is revolutionizing the landscape of security and defense by leveraging core competencies in software development, automation, DevSecOps, and machine learning. They are seeking a Senior Backend Software Developer to design, develop, and support scalable APIs and services that enable mission-critical decisions. The role involves collaborating with frontend engineers and other stakeholders to ensure high-quality tool delivery in mission environments.

Application Performance ManagementCloud ComputingConsultingDeveloper ToolsDevOpsMobileQuality AssuranceSoftwareSoftware EngineeringWeb Development

No H1B

Security Clearance Required

U.S. Citizen Only

Responsibilities

Design, implement, and maintain backend services, APIs, and integrations that support product features

Develop data models and persistence layers; ensure data quality, integrity, and performance

Build reliable service-to-service communication and integration patterns (REST/GraphQL, messaging, streaming)

Apply secure coding practices and ensure appropriate authentication/authorization patterns

Create and maintain automated tests (unit/integration) and participate in peer code reviews

Diagnose and resolve production issues; improve reliability through monitoring, alerting, and runbooks

Collaborate with frontend engineers and other stakeholders to define contracts and support end-to-end delivery

Identify bottlenecks and drive performance improvements (latency, throughput, resource utilization)

Produce technical documentation for systems, APIs, and operational procedures

Qualification

Backend developmentAPI designDatabase managementDockerKubernetesMessaging platformsSecure coding practicesTesting strategiesIncident responseCross-functional collaborationTechnical documentation

Required

Demonstrated experience building and operating production backend services and APIs

Proficiency in at least one backend language (e.g., Python, Java, Go, C#, Node.js) and common frameworks

Strong understanding of API design, authentication/authorization concepts, and service reliability

Experience with relational and/or NoSQL databases, query optimization, and schema/data modeling

Experience with messaging and queuing platforms such as Kafka, RabbitMQ, or similar

Familiarity with testing strategies and CI workflows; comfort with debugging and incident triage

Ability to collaborate cross-functionally and communicate technical decisions clearly

Experience creating and maintaining Docker containers, Helm charts, orchestration platforms such as Kubernetes clusters, and using cloud infrastructure services (AWS/Azure/GCP)

Bachelor's degree in a related field or equivalent practical experience

At least 10+ years performing backend software engineering

Active TS/SCI clearance

Ability to work on-site at one of the following locations - Virginia: Fairfax, Chantilly, McLean, Sterling or Colorado: Colorado Springs