> Markdown version of [/jobs/ext/4031187-principal-full-stack-developer](https://www.wearedevelopers.com/jobs/ext/4031187-principal-full-stack-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Full Stack Developer - **Company:** JOSEF GROUP INC - **Location:** Springfield, VA, United States - **Salary:** $220,000.0 - $245,000.0 - **Contract:** Permanent contract - **Skills:** Geographic Information Systems, Application Programming Interfaces (APIs), Agile Methodology, Amazon Web Services, Apache HTTP Server, Computer Vision, Automation of Tests, Microsoft Azure, Big Data, BigQuery, Cloud Computing, Software Quality, Databases, Extract Transform Load (ETL), DevOps, Distributed Systems, Web Servers, JSON, Python (Programming Language), PostgreSQL, Machine Learning, MongoDB, Multiprocessing, Nginx, Node.Js, NumPy, Object-Oriented Software Development, Quantum GIS (QGIS), Tensorflow, Server Administration, Verification and Validation (Software), Systems Integration, Strategies of Testing, Web Application Frameworks, Google Cloud, Data Storage Technologies, Pytorch, ReactJS, Flask (Web Framework), Parallel Computation, Backend, Fastapi, Pandas, Event Driven Architecture, Containerization, Scikit Learn, Information Technology, Data Analytics, Dask, Non-relational Database, Operational Systems, Machine Learning Operations, Restful APIs, Stream Processing, Grpc, Data Pipelines, Docker, Microservices - **Published:** October 30, 2026 - **Apply:** https://www.careerbuilder.com/job-details/principal-full-stack-developer-springfield-va--fef4780a-c205-4b4a-a14b-4ef8b36d2d38 ## About the Role Sensitive Compartmented Information (SCI), Top Secret Clearance, Architectural Design, Product Lifecycle, Software Administration, Operational Support, Application Programming Interface (API), Machine Learning, Equipment Maintenance/Repair, Database Extract Transform and Load (ETL), * Active TS/SCI clearance with the ability to obtain a CI poly * Bachelor's degree in Computer Science, Engineering, or a related technical field. * 14+ years of professional experience in full stack software development. * Expert-level proficiency in Python and object-oriented design patterns. * Extensive experience developing backend systems, APIs, and data processing pipelines. * Strong experience with modern web development frameworks, including React.js, Node.js, and/or Electron. * Deep understanding of data modeling techniques and experience working with large-scale and time series datasets. * Experience with relational and non-relational databases such as PostgreSQL, MongoDB, and BigQuery. * Experience building and maintaining RESTful APIs and microservices architectures. * Experience supporting machine learning workflows, including model integration, deployment, and monitoring. * Familiarity with ML/Ops tools and utilities such as MLflow, DVC, and/or Optuna. * Strong experience with Python libraries such as NumPy and Pandas. * Experience with Python web frameworks such as Flask, FastAPI, Pydantic, Gunicorn, and Uvicorn. * Experience with containerization and DevOps practices, including Docker and CI/CD pipelines. * Experience with web servers such as Apache and Nginx. * Experience working within Agile development environments and using associated tools. What Would be Nice to Have: * Experience supporting government or defense-related programs. * Experience integrating computer vision or machine learning capabilities into operational systems. * Knowledge of real-time data processing, streaming architectures, or distributed systems. * Experience with cloud-based ML/Ops environments and infrastructure (AWS, Azure, or Google Cloud Platform). * Experience with parallelization and multiprocessing frameworks such as Dask. * Knowledge of geospatial data processing tools and libraries including GeoPandas, Shapely, Rasterio, QGIS, and ArcPy. * Experience with machine learning frameworks such as Scikit-learn, TensorFlow, or PyTorch. * Experience with remote procedure call technologies such as gRPC and JSON-RPC. ## Description * Lead and participate in the architectural design of complex features early in the development lifecycle. * Translate customer requirements and roadmap priorities into technical solutions, tasks, timelines, and resource plans. * Develop, integrate, and maintain full stack applications supporting ML/Ops pipelines and data-driven systems. * Design and implement scalable APIs and services to support machine learning model deployment and inference. * Develop and maintain data pipelines, ETL processes, and data storage solutions for large-scale datasets. * Collaborate with data scientists and ML engineers to operationalize models within production environments. * Optimize application and system performance for scalability, reliability, and efficiency, including edge and distributed environments when applicable. * Conduct peer reviews and establish coding standards to improve overall code quality and maintainability. * Guide development testing, exploratory testing, automated testing, and validation strategies. * Own code in production environments, respond to incidents, and lead root cause analysis and continuous improvement efforts. * Ensure security, compliance, and governance are maintained throughout the development lifecycle. * Perform technical planning, system integration, verification and validation, and risk assessments across system components. * Mentor and develop junior and mid-level engineers, fostering technical growth and high-performing teams. * Drive adoption of modern ML/Ops practices, tools, and automation frameworks across the team.