Software Engineer (Expert)

NS2 Mission; Chantilly (VA); On-site; USD 183,000 - 237,000; Full time

Job summary

NS2 Mission in Chantilly, VA is seeking an Expert Software Engineer to design, build, and evolve secure, scalable full-stack applications supporting Intelligence Community customers.

You will work across the full software development lifecycle, contributing to backend services, RESTful APIs, and modern user interfaces using Python, JavaScript, and Angular in a collaborative Agile environment. A TS/SCI with an FSP clearance is required.

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, Information Systems, or a related technical discipline (or equivalent).
• Approximately 10+ years of professional experience designing and delivering enterprise software solutions.
• Advanced proficiency in Python for backend development.
• Strong command of JavaScript and modern front-end practices.
• Expertise with Angular or comparable front-end frameworks.
• RESTful API design and integration in distributed applications.
• Hands-on knowledge of Oracle databases and SQL development.
• Experience with PostgreSQL, SQL Server, or MySQL.
• Proven ability to develop and maintain applications in Linux/Unix environments.
• Familiarity with Agile methodologies and secure development practices.

Responsibilities

• Lead design and development of scalable full-stack applications from requirements through deployment.
• Architect and implement backend services using Python and modern frameworks.
• Develop and integrate RESTful APIs for system interoperability and data exchange.
• Design and optimize relational databases for performance and scalability.
• Build responsive user interfaces with JavaScript and Angular.
• Collaborate with architects and stakeholders to define approaches and deliver solutions.
• Diagnose and resolve software defects, performance and integration issues.
• Contribute to design reviews, code reviews, and engineering discussions.
• Participate in technical planning, testing, deployment, and sustainment.
• Support Agile delivery and continuous process improvement.
• Ensure security, performance, and maintainability objectives are met.

Skills

Python

JavaScript

Angular

RESTful APIs

Linux/Unix

PostgreSQL

MySQL

Oracle

SQL

Agile

Education

Bachelor's degree in Computer Science or related field

Tools

AWS

Docker

Kubernetes

Git

Jenkins

Terraform

SQLAlchemy

FastAPI

Job description

Join NS2 Mission and help shape the software capabilities behind critical national security missions. As an Expert Software Engineer in Chantilly, VA, you'll design, build, and evolve secure, scalable applications supporting Intelligence Community customers.

Working across the full software development lifecycle, you'll contribute to both backend services and modern user experiences while helping guide technical solutions, resolve complex engineering challenges, and improve the performance and reliability of mission-critical applications. This is an opportunity to work with modern technologies including Python, RESTful APIs, relational databases, JavaScript, and Angular in a collaborative Agile environment.

Key Responsibilities

• Lead the design and development of scalable full-stack applications from initial requirements through deployment and sustainment.


• Architect and implement backend services using Python and modern application frameworks.


• Develop and integrate RESTful APIs to support system interoperability, data exchange, and distributed application functionality.


• Design and optimize relational database solutions with a focus on performance, scalability, and maintainability.


• Build and enhance responsive user interfaces using JavaScript, Angular, and modern front-end development practices.


• Partner with architects, engineers, and mission stakeholders to evaluate requirements, shape technical approaches, and deliver effective solutions.


• Diagnose complex software defects, integration challenges, and performance issues, implementing solutions that improve system reliability.


• Provide technical input through design reviews, peer code reviews, and engineering discussions while promoting sound development practices.


• Contribute to technical planning, estimation, testing, deployment, and long-term application sustainment.


• Support Agile delivery activities and help drive continuous improvement across development processes and engineering practices.


• Ensure application solutions meet established security, performance, scalability, and maintainability objectives.

Required Qualifications

• Bachelor's degree in Computer Science, Software Engineering, Information Systems, or a related technical discipline (or equivalent combination of education and experience).


• Approximately 10+ years of professional experience designing and delivering enterprise software solutions.


• Advanced proficiency in Python for backend and application development.


• Strong command of JavaScript and modern front-end development practices.


• Expertise with Angular or comparable modern front-end frameworks.


• Demonstrated ability to design, develop, and integrate RESTful APIs within distributed applications.


• Hands‑on knowledge of Oracle databases, including SQL development, application integration, and data access.


• Background working with relational database technologies such as PostgreSQL, SQL Server, or MySQL.


• Proven ability to develop and maintain applications within Linux/Unix environments.


• Solid understanding of software engineering practices, including version control, automated testing, peer reviews, and secure development principles.


• Familiarity with Agile methodologies and experience contributing across the full software development lifecycle.


• Strong analytical, troubleshooting, and technical problem-solving capabilities.

Preferred Qualifications

• Hands‑on development of APIs using FastAPI.


• Working knowledge of SQLAlchemy or comparable ORM technologies for application-to-database integration.


• Background designing and deploying cloud-based applications, particularly within AWS environments.


• Understanding of CI/CD pipelines, DevOps practices, and automated software delivery.


• Exposure to Docker, Kubernetes, microservices, and other distributed application technologies.


• Proficiency with development and infrastructure tools such as Git, Jenkins, Terraform, or similar platforms.


• Knowledge of Elasticsearch, OpenSearch, or comparable search and analytics technologies.


• Demonstrated ability to provide technical direction, mentor fellow engineers, or contribute to development standards.


• Previous support of Intelligence Community or Department of Defense software development programs.

Position Clearance Requirement

TS/SCI with an FSP

Salary and Benefits Information

The salary range for this position is $183,259.00 to $237,433.00. The proposed range is intended as a general guideline. Final compensation will be determined based on qualifications, experience, location, and contractual considerations and may fall outside of the stated range. We offer a great benefits package designed to support you and your family. View our benefits information here: https://sapns2.com/ns2-mission-careers/

We win with inclusion

NS2 Mission's culture of inclusion, focus on health and well-being, and flexible working models help ensure that everyone - regardless of background - feels included and can run at their best. At NS2 Mission, we believe we are made stronger by the unique capabilities and qualities that each person brings to our company, and we invest in our employees to inspire confidence and help everyone realize their full potential. We ultimately believe in unleashing all talent and creating a better world.

NS2 Mission is committed to the values of Equal Employment Opportunity and provides accessibility accommodations to applicants with physical and/or mental disabilities. If you are interested in applying for employment with NS2 Mission and are in need of accommodation or special assistance to navigate our website or to complete your application, please send an e-mail with your request to Recruiting Operations Team: [e-mail].

Qualified applicants will receive consideration for employment without regard to their age, race, religion, national origin, ethnicity, age, gender (including pregnancy, childbirth, et al), sexual orientation, gender identity or expression, protected veteran status, or disability, in compliance with applicable federal, state, and local legal requirements.

Please be aware many of our positions require the ability to obtain or maintain a U.S security clearance which requires U.S citizenship.