Senior Fastapi Developer Jobs in Virginia (NOW HIRING)

Responsibilities

Peraton Labs is seeking a Senior Full-Stack Platform Engineer to help build and scale a platform that enables rapid development of secure, AI-powered applications through natural language interfaces, agent builders, and mission-level workflow orchestration.

This platform is intended to provide a modern, efficient alternative to traditional data intelligence and application delivery approaches by centralizing common capabilities such as security, access control, reusable platform services, and Agentic AI implementation patterns. The product will help development teams transition toward AI-enabled, spec-based engineering workflows, and accelerating delivery of solutions across a wide range of mission and business use cases.

In this position, you will help establish the platform foundation that enables teams to rapidly build and deploy secure Agentic AI solutions. Your work will reduce duplication, accelerate delivery, improve governance, and make advanced AI capabilities more accessible to developers and mission users alike. This role is best suited for a senior cloud/platform engineer who can build secure, scalable, cloud-native platform capabilities and help establish the technical foundation for enterprise-wide adoption of Agentic AI.

Key responsibilities may include, but are not limited to:

• Design, build, deploy, and maintain core platform services supporting an Agentic AI platform in cloud environments such as AWS, Azure, or similar
• Engineer scalable platform capabilities for agent orchestration, workflow execution, API integration, identity and access control, observability, and secure application enablement
• Build reusable infrastructure and shared services that reduce developer overhead and accelerate delivery of AI-enabled applications
• Develop cloud-native solutions using containerization, microservices, API-first design, infrastructure-as-code (IaC), and automated deployment pipelines
• Implement secure platform controls including authentication, authorization, secrets management, auditing, and policy enforcement
• Partner with software engineers, architects, product teams, and security stakeholders to define platform requirements, technical standards, and implementation priorities
• Improve platform reliability and operational maturity through monitoring, logging, tracing, alerting, and performance optimization
• Support integration of AI/LLM capabilities into a cohesive platform architecture
• Troubleshoot complex platform, cloud, and deployment issues in development and production
• Document platform architecture, engineering standards, and operational best practices
• Contribute as a senior technical team member by helping shape platform direction and mentoring other engineers as needed
• Design and implement RESTful API endpoints using FastAPI, maintain API contracts with frontend consumers, and implement OpenAI-compatible API endpoints with token streaming
• Develop and extend the plugin lifecycle system: packaging, validation, deployment, activation, and lifecycle hook execution across worker, service, and library plugin types
• Manage database operations using SQLModel/SQLAlchemy with PostgreSQL, implement schema migrations, and maintain configuration management
• Write unit and integration tests, enforce code quality), and contribute to CI/CD pipelines
• Collaborate with frontend engineers to deliver cohesive user experiences, and where possible, contribute to frontend development of platform UI supporting components and frameworks

Qualifications

Required Qualifications

• Minimum of BS with 12+ years of experience, MS with 10+ years of experience or PhD with 7+ YoE in Computer Science, Computer Engineering, Software Engineering, Information Systems, or related technical field
• 7-10 years of relevant experience in platform engineering, cloud engineering, DevOps, infrastructure engineering, backend systems, or related technical roles
• Hands-on experience with major cloud platforms such as AWS, Azure, or Google Cloud
• Strong experience building and operating cloud-native platforms or distributed systems in production environments
• Experience with Docker, Kubernetes, and modern container-based deployment models
• Experience with infrastructure-as-code (IaC) using tools such as Terraform
• Strong understanding of CI/CD, automated testing, deployment pipelines, and release engineering best practices
• Experience implementing enterprise-grade platform security capabilities such as RBAC, IAM, secrets management, encryption, and policy controls
• Strong proficiency in Python (5+ years, with async/await experience); additional proficiency in Java, JavaScript/TypeScript or other languages preferred for full-stack contributions
• Production experience with FastAPI or similar async web frameworks, and hands-on experience designing and integrating RESTful APIs in secure, scalable environments
• Experience with the monitoring, logging, metrics, and operational support for production systems
• Ability to work across technical teams and translate requirements into well engineered solutions
• Strong written and verbal communication skills
• Experience with PostgreSQL and ORM tools (SQLModel, SQLAlchemy, or equivalent)
• Experience with pytest or similar testing frameworks and writing maintainable test suites
• Understanding of distributed systems concepts (eventual consistency, idempotency, retry patterns)
• US Citizenship is required for this position

Desired Qualifications

• Experience supporting AI/ML or LLM-enabled platforms
• Familiarity with Agentic AI, including agent orchestration, tool use, workflow chaining, and human-in-the-loop execution models
• Experience building multi-tenant developer platforms or shared services used by multiple domains or modalities
• Experience with platform patterns that support self-service application development or workflow-based solution delivery
• Familiarity with modern AI development tooling (LangChain, LangGraph, or similar agent frameworks), model integration patterns, or orchestration frameworks such as Airflow or Prefect
• Experience with event-driven architecture, messaging systems, and asynchronous processing
• Experience optimizing platform scalability, reliability, and cloud cost
• Experience supporting commercial product delivery, or enterprise platform adoption across multiple business areas
• Experience defining platform standards, reusable engineering patterns, and technical roadmaps
• Experience with OPA (Open Policy Agent) or policy-based access control and authorization
• Experience with OpenTelemetry and observability tooling (Jaeger, Prometheus, Grafana)
• Experience with Kafka, RabbitMQ, ZeroMQ, gRPC, or similar messaging and RPC systems
• Frontend development experience with modern JavaScript frameworks (React, Vue, or similar) - strongly preferred for full-stack contributions
• Experience with product line, plugin, or extension architectures involving dynamic loading, sandboxed execution, and lifecycle management

Peraton Overview

Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the world's leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace. The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can't be done by solving the most daunting challenges facing our customers. Visit peraton.com to learn how we're keeping people around the world safe and secure.

Target Salary Range$146,000 - $234,000. This represents the typical salary range for this position. Salary is determined by various factors, including but not limited to, the scope and responsibilities of the position, the individual's experience, education, knowledge, skills, and competencies, as well as geographic location and business and contract considerations. Depending on the position, employees may be eligible for overtime, shift differential, and a discretionary bonus in addition to base pay.EEOEEO: Equal opportunity employer, including disability and protected veterans, or other characteristics protected by law.Employment Type: FULL_TIME