1762 Software Developers jobs in Arlington

Momentum Engineering, Inc., a Woman-Owned Small Business (WOSB), fosters an employee-centric culture. Our strength lies in our people. With a high percentage of employees holding advanced degrees in engineering, computer science, and related disciplines, we bring deep technical expertise to every mission. Our team includes professionals with security clearances and full-scope polygraphs, ensuring trusted, secure support for the most sensitive national security initiatives. Additionally, our workforce is equipped with industry-leading certifications, demonstrating a commitment to continuous learning and excellence. Most importantly, our exceptional employee retention rate reflects a culture of professional growth, mission focus, and dedication-ensuring long-term stability and expertise for our customers' critical needs.

Job Summary

• Seeking Software Developers to join our team and help accelerate a federal mission client's discovery and delivery of identity and network-based intelligence insights to counter national security threats and malicious actors
• Software developers will assist in crafting, testing, and recommending scalable, flexible, and resilient designs and implement integrations with a standard platform in a cloud environment
• The ideal candidate will have experience in strategizing overall build tools and software to facilitate information and data sharing, and advance analytic practices

• Employ software development techniques and methodologies for solving tough analytical challenges in support of one of national security threats
• Use software development skills to automate manual analytical processes
• Opportunity to expand upon beyond specializations to include front end user interfaces, back end microservices, web services, cloud architectures, as well as databases and other persistent data stores
• Deploy developed IT solutions, user applications, databases, and other IT capabilities
• Design and develop specialized user solutions, applications and databases using a hybrid Agile approach within a DevOps environment
• Provide Tier 3 technical support for deployed applications and databases
• Knowledge of code versioning tools such as Git
• Experience with cloud message APIs and usage of push notifications
• Maintain code integrity and organization
• Collaborate with the rest of engineering team to design and launch new features. Includes coordination and documentation of deployment procedures, release plans, etc.
• Keen interest in learning and using the latest software tools, methods, and technologies to solve real world problem sets vital to national security
• Support off-hours deployment such as evening or weekends

• Must have active Top Secret/SCI clearance
• Understanding of cloud architectures and enabling tools and technologies, such as, AWS Cloud (GovCloud/C2S)
• Familiar with Amazon Web Managed Services (AWS)
• JavaScript, Angular, Typescript, Node.js, MongoDB, JSON, SQL, XML
• High experience level with back-end programming languages (Java/Spring, Python)
• Working knowledge with datastores MongoDB, DynamoDB, PostgreSQL, S3, Redshift, Redis, and Elasticsearch
• Familiar with technologies jQuery, ASP/.Net, NoSQL, PL/SQL, LDAP, HTTP, REST/SOAP, RDBMS
• Familiar with Configuration Management and CI Tools, such as, Git/Gitlab, Jenkins, SonarQube, Maven, Ansible, Chef
• Familiar with Linux/Unix server environments
• Experience with Agile development methodology
• Working knowledge with Collaboration tools, such as, Jira and Confluence

• Working knowledge with software platforms and services, such as, Docker, Kubernetes, JMS/SQS/SNS, Kafka, AWS Lambda, NiFi
• Working knowledge with public keys and digital certificates
• Experience with automated testing patterns and tools, such as, Mocha/Chai, JUnit, NUnit, TestNG
• Experience with DevOps environments
• Expertise in various COTS, GOTS and open-source tools which support development of data integration and visualization applications
• Experience with cloud message APIs and usage of push notifications
• Specialization in Object Oriented Programming languages, scripting, and databases
• Familiar with Python, Groovy, Shell Script

More than 7 years of experience as a full stack developer. Experience developing applications with core Java, Hibernate, JDBC, JSP, Servlets, Web Services, REST, Spring MVC/Boot/Cloud. Experience of working in JavaScript frameworks (Go/React/Angular).

• 3+ years of combined experience in any of the following: Developing web applications using JavaScript/Typescript and a related framework (Angular, React, or Vue) including building HTML and CSS
• Experience with server-side application development using Java, C#, or Python
• Experience with usability analysis, automated testing development (unit and E2E)
• Experience with switching between different languages and learning new ones, as necessary
• Experience in working closely with software development teams
• Experience with Kafka, Kubernetes, Git, Node.Js, SQL, Python

• DoD 8570 Compliant Security+ or CISSP Certification prior to starting on contract
• Experience with Java Spring Framework
• Experience with testing frameworks, including Jasmine, Karma, or Selenium
• Experience with Linux scripting in BASH or Perl
• Experience with using JavaScript visualization libraries, including D3, Leaflet, and AG Grid
• Experience with information security
• Experience with Agile/Kanban development methodologies
• Knowledge of JIRA, Confluence, Git, and GitHub/GitLab
• Knowledge of standards in JavaScript, JSON, REST, CORS, Web architecture, and HTTP specification
• TS/SCI clearance required

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• Split role between data engineering and Python engineering, focused on migration from standard databases to a Snowflake data warehouse
• Support transition from risk division databases to a centralized warehouse to enable standardized business reporting
• Perform Python and PySpark development along with ETL and Informatica responsibilities
• Handle scheduling and workflow tasks in Control-M to support data pipelines and integrations
• Work as part of a team of 3-4 developers, a tech lead, and team manager, with additional engineers joining later, leveraging Informatica, Python, PySpark, and SQL as core tools

• Python
• Pyspark
• MongoDB
• SQL.
• ETL
• Understanding of Agile practices.

• Preferred Snowflake and Informatica.
• Data warehousing
• Automation testing

• Python
• Pyspark
• MongoDB
• SQL
• ETL
• Agile practices.

• Recruiter
• Email
• Phone
• Sudhir Swami

M9 Solutions is dedicated to providing IT services and solutions to the Federal Government by mobilizing the right people, skills, clearance levels, and technologies to help organizations who desire improved performance and modern, sustainable change. M9 has provided quality IT services and support to more than 30 Federal Agencies and multiple commercial customers nationwide. Our capabilities include digital transformation, software development, cloud migration, applications & infrastructure, cybersecurity, data delivery & analytics, and IT talent solutions.

M9 Solutions is seeking a Full Stack Developer to work (hybrid) on a government contract for a client located in Washington, DC. An active TS/SCI clearance is required.

Responsibilities

• Employ software development techniques and methodologies for solving tough analytical challenges vital to national security.
• Use software development skills to automate manual analytical processes.
• Opportunity to expand beyond specializations to include front end user interfaces, back end microservices, web services, cloud architectures, as well as databases and other persistent data stores.
• Deploy developed IT solutions, user applications, databases, and other IT capabilities.
• Design and develop specialized user solutions, applications, and databases using a hybrid Agile approach within a DevOps environment.
• Provide Tier 3 technical support for deployed applications and databases.
• Maintain code integrity and organization.
• Collaborate with the rest of the engineering team to design and launch new features. This includes coordination and documentation of deployment procedures, release plans, etc.
• Support off-hours deployment on evenings or weekends.

• TS/SCI security clearance.
• Bachelor's degree or higher is required.
• 2 - 8+ years of relevant experience.
• Knowledge of code versioning tools such as Git.
• Experience with cloud message APIs and usage of push notifications.
• Understanding of cloud architectures and enabling tools and technologies, such as AWS Cloud (GovCloud/C2S).
• Familiar with Amazon Web Managed Services (AWS).
• JavaScript, Angular, Typescript, Node.js, MongoDB, JSON, SQL, XML.
• High experience level with back-end programming languages (Java/Spring, Python).
• Working knowledge of datastores MongoDB, DynamoDB, PostgreSQL, S3, Redshift, Redis, and Elasticsearch.
• Familiar with technologies jQuery, ASP/.Net, NoSQL, PL/SQL, LDAP, HTTP, REST/SOAP, RDBMS.
• Familiar with Configuration Management and CI tools such as Git/Gitlab, Jenkins, SonarQube, Maven, Ansible, Chef.
• Familiar with Linux/Unix server environments.
• Experience with Agile development methodology.
• Working knowledge of collaboration tools such as Jira and Confluence.
• Keen interest in learning and using the latest software tools, methods, and technologies to solve real world problem sets vital to national security.

• Working knowledge of software platforms and services such as Docker, Kubernetes, JMS/SQS/SNS, Kafka, AWS Lambda, NiFi.
• Working knowledge of public keys and digital certificates.
• Experience with automated testing patterns and tools such as Mocha/Chai, JUnit, NUnit, TestNG.
• Experience with DevOps environments.
• Expertise in various COTS, GOTS and open-source tools which support development of data integration and visualization applications.
• Specialization in Object Oriented Programming languages, scripting, and databases.
• Familiar with Python, Groovy, Shell Script.

• M9 Solutions' pay range for this position is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include, but are not limited to, responsibilities of the position, education, experience, knowledge, skills, abilities, as well as internal equity, location, alignment with market data, applicable bargaining agreement (if any), or other law.
• M9 Benefits -

Unissant, Inc. delivers innovative capabilities to the agencies that keep our nation healthy and safe. We apply our domain expertise, data acumen, and technology know-how to achieve breakthrough results for our clients. Working collaboratively, we advance missions and careers through a focus on honesty, integrity, and dependability. We continuously look for talent, excited to join that effort. To learn more about our exciting organization, please visit us at

We are seeking a Full Stack Developer to join our team and to support modernization initiatives with experience in Java (Spring Boot, JPA, Liquibase), Angular, and databases (RDS, PostgreSQL). The ideal candidate excels in building scalable microservices, containerized deployments, and CI/CD automation using GitOps.

Qualified applicants may be subject to a security investigation and must meet minimum qualifications for access to classified information. This is a highly technical position; individuals will be screened by peers in a technical review of skills and experience.

*This position is contingent upon contract award.

Essential Duties and Responsibilities:

• Develop high-quality web applications using Spring Boot, JPA, Liquibase, and Angular as core frameworks as directed by Tech Lead and Product Managers.
• Implement, and maintain robust and highly secure RESTful APIs and microservices supporting business-critical workflows.
• Develop, test, and optimize scalable database solutions using Relational Database Service (RDS) and PostgreSQL.
• Apply OWASP secure coding practices and test-driven development (TDD) principles to deliver high-quality, maintainable code; write automated tests for all new features.
• Leverage Docker to containerize application components, ensuring consistency across development, test, and production environments.
• Automate deployments with CI/CD pipelines integrated via GitOps tools.
• Collaborate closely with cross-functional teams to deliver end-to-end features.
• Troubleshoot, debug, and resolve complex defects across the application stack.
• Ensure secure design and compliance with best practices for access control and data protection.
• Support legacy JEE software applications on WebSphere.
• Participate and present in formal and informal design reviews and document the design according to the Government's system lifecycle methodology.

Work Experience & Job Skills:

• Minimum 3+ years of hands-on development experience and strong foundation in using Java, Spring boot Microservices, JPA and Angular 14+
• Experience with modern software engineering tools and methodologies including Eclipse, Spring Tool Suite (STS), Visual Studio Code, and Atlassian Products (Jira, Confluence).
• Understanding of building and querying RDS databases, especially PostgreSQL.
• Knowledge of test-driven development (TDD), with the ability to write and maintain unit, integration, and end-to-end tests.
• Strong understanding of microservice architecture and associated design patterns.
• Experience with containerization (Docker) for deploying and managing scalable applications.
• Proficiency in CI/CD automation, using GitOps tools for deployment orchestration (e.g., ArgoCD, GitHub Actions).
• Proficient with version control systems (Git) and Agile software development practices.
• Understanding of Web services (SOAP and Restful) and JEE Server experience (WebLogic, WebSphere etc.).
• Experience with Unix/Linux.

Education:

• Bachelor's Degree in Computer Science, Software Engineering, Information Technology, or related field with applicable experience is required. Applicable work experience may be considered in lieu of a degree.

Certificates, Licenses, and Registrations:

• This federal program requires the candidates to be a United States Citizen.
• Must have a current CBP BI clearance or be eligible to obtain one.
• Any related systems engineering, or related technical certifications are desired.

Communication Skills:

• Must have excellent written and verbal communication skills.
• Ability to convey technical information to non-technical individuals.
• Demonstrated experience communicating effectively across internal and external organizations.
• Must work well in a matrixed team environment.

Travel:

• This is a Hybrid position.

Environmental Requirements:

• Mainly sedentary; in an office environment
• May be required to lift to ten (10) pounds
• Flexible in working extended hours

The above statements are intended to describe the general nature and level of work being performed by the individual(s) assigned to this position. They are not intended to be an exhaustive list of all duties, responsibilities, and skills required. Unissant management reserves the right to modify, add, or remove duties and to assign other duties as necessary. In addition, where applicable and available, reasonable accommodation(s) may be made to enable individuals with disabilities to perform essential functions of this position.

Please note: Candidate(s) will be required to go through pre-employment screening.

Unissant, Inc. is a proud Equal Opportunity Employer! (EOE; M/F/Disability/Vets)

We are a world-class team of professionals who deliver next generation technology and products in robotic and autonomous platforms, ground, soldier, and maritime systems in 50+ locations world-wide. Much of our work contributes to innovative research in the fields of sensor science, signal processing, data fusion, artificial intelligence (AI), machine learning (ML), and augmented reality (AR).

QinetiQ US's dedicated experts in defense, aerospace, security, and related fields all work together to explore new ways of protecting the American Warfighter, Security Forces, and Allies. Being a part of QinetiQ US means being central to the safety and security of the world around us. Partnering with our customers, we help save lives; reduce risks to society; and maintain the global infrastructure on which we all depend.

Why Join QinetiQ US?

If you have the courage to take on a wide variety of complex challenges, then you will experience a unique working environment where innovative teams blend different perspectives, disciplines, and technologies to discover new ways of solving complex problems. In our diverse and inclusive environment, you can be authentic, feel valued, be respected, and realize your full potential. QinetiQ US will support you with workplace flexibility, a commitment to the health and well-being of you and your family and provide opportunities to work with a purpose. We are committed to supporting your success in both your professional and personal lives.

We are seeking an experienced Full Stack Developer to serve as the primary developer and maintainer of our existing web application. This role requires a self-directed professional who can own the complete software development lifecycle while working closely with business stakeholders and end users. The ideal candidate will have strong experience with Flask/React applications and containerized deployments.

Development & Maintenance

Serve as primary developer and maintainer for existing web application built with Flask backend and React frontend (legacy versions)

• Own end-to-end software lifecycle including design updates, development, testing, deployment, and production support

• Perform bug fixes, troubleshooting, and performance tuning to ensure optimal system stability and availability

• Refactor and modernize legacy code to improve maintainability and performance when feasible

Infrastructure & DevOps

• Manage and maintain containerized deployments using Docker Compose and AWS EC2

• Apply security patches, library upgrades, and system updates in a timely manner

• Monitor system health and proactively address potential issues

Stakeholder Collaboration

• Collaborate with Business Analyst and user base to review feature requests, triage bugs, and establish development priorities

• Function as co-product owner alongside Business Analyst to evaluate incoming requests and establish realistic timelines

• Interact directly with end users to clarify requirements, troubleshoot issues, and deliver effective solutions

Documentation & Communication

• Write and maintain comprehensive technical documentation

• Provide clear communication on project status, technical challenges, and solutions

Experience

• 4+ years of full stack web development experience
• Bachelor's Degree in an IT-related discipline

• Experience maintaining and enhancing legacy applications

• Background working directly with business stakeholders and end users

• Demonstrated experience in production environment management

• Clearance Level Must Be Able to Obtain: DOD Secret

Technical Skills

• Strong proficiency in Python and Flask framework

• Solid experience with React and modern JavaScript

• Experience with Docker and containerization technologies

• Familiarity with AWS services, particularly EC2

• Understanding of web application architecture and best practices

• Knowledge of version control systems (Git)

• Experience with database management and optimization

• Secret clearance or willingness to obtain one
• Knowledge of CI/CD pipelines
• Familiarity with monitoring and logging tools

• Experience with database migrations and schema management

• Background in security best practices for web applications

Accessibility/Accommodation:

If because of a medical condition or disability you need a reasonable accommodation for any part of the employment process, please send an e-mail to or call Opt. 4 and let us know the nature of your request and contact information.

QinetiQ US is an Equal Opportunity employer. All Qualified Applicants will receive equal consideration for employment without regard to race, age, color, religion, creed, sex, sexual orientation, gender identity, national origin, disability, or protected Veteran status.

BigBear.ai is seeking Software Developers to join our team and help accelerate a federal mission client’s discovery and delivery of identity and network-based intelligence insights to counter national security threats and malicious actors. Our software developers will assist in crafting, testing, and recommending scalable, flexible, and resilient designs and implement integrations with a standard platform in a cloud environment. The ideal candidate will have experience in strategizing overall build tools and software to facilitate information and data sharing and advance analytic practices.

• Employ software development techniques and methodologies for solving tough analytical challenges in support of one of national security threats
• Use software development skills to automate manual analytical processes
• Opportunity to expand beyond specializations to include front end user interfaces, back end microservices, web services, cloud architecture, as well as databases and other persistent data stores
• Deploy developed IT solutions, user applications, databases, and other IT capabilities
• Design and develop specialized user solutions, applications and databases using a hybrid Agile approach within a DevOps environment
• Provide Tier 3 technical support for deployed applications and databases
• Knowledge of code versioning tools such as Git
• Experience with cloud message APIs and usage of push notifications
• Maintain code integrity and organization
• Collaborate with the rest of engineering team to design and launch new features. Includes coordination and documentation of deployment procedures, release plans, etc.
• Keen interest in learning and using the latest software tools, methods, and technologies to solve real world problems sets vital to national security
• Support off-hours deployment such as evening or weekends

• Must possess and maintain a TS/SCI
• Understanding of cloud architecture and enabling tools and technologies, such as, AWS Cloud (GovCloud/C2S)
• Familiar with Amazon Web Managed Services (AWS)
• JavaScript, Angular, Typescript, Node.js, MongoDB, JSON, SQL, XML
• High experience level with back-end programming languages (Java/Spring, Python)
• Working knowledge with datastores MongoDB, DynamoDB, PostgreSQL, S3, Redshift, Redis, and Elasticsearch
• Familiar with technologies jQuery, ASP/.Net, NoSQL, PL/SQL, LDAP, HTTP, REST/SOAP, RDBMS
• Familiar with Configuration Management and CI Tools, such as, Git/Gitlab, Jenkins, SonarQube, Maven, Ansible, Chef
• Familiar with Linux/Unix server environments
• Experience with Agile development methodology
• Working knowledge with Collaboration tools, such as, Jira and Confluence

• Working knowledge with software platforms and services, such as, Docker, Kubernetes, JMS/SQS/SNS, Kafka, AWS Lambda, NiFi,
• Working knowledge with public keys and digital certificates
• Experience with automated testing patterns and tools, such as Mocha/Chai, JUnit, NUnit, TestNG
• Experience with DevOps environments
• Expertise in various COTS, GOTS and open-source tools which support development of data integration and visualization applications
• Experience with cloud message APIs and usage of push notifications
• Specialization in Object Oriented Programming languages, scripting, and databases
• Familiar with Python, Groovy, Shell Script

BigBear.ai is a leading provider of AI-powered decision intelligence solutions for national security, supply chain management, and digital identity. Customers and partners rely on Bigbear.ai’s predictive analytics capabilities in highly complex, distributed, mission-based operating environments. Headquartered in McLean, Virginia, BigBear.ai is a public company traded on the NYSE under the symbol BBAI. For more information, visit and follow BigBear.ai on LinkedIn: @BigBear.ai and X: @BigBearai.

BigBear.ai is an Equal opportunity employer all protected groups, including protected veterans and individuals with disabilities.

MAG is staffing for a Full Stack Developer who will join an elite team developing next-generation tactical edge systems that provide decision superiority to warfighters in contested environments. You'll leverage COTS, FOSS/OSS, and custom development to build and integrate mission-critical applications that operate where traditional software fails - with intermittent networks, limited compute, and active adversaries.

This is a Hybrid Position - Remote mainly - but as well on call to come into a MAG office when requested. 

We are seeking candidates who live in proximity to our corporate HQ in Fairfax, VA primarily but will entertain persons living near our satellite offices in:

Aberdeen, MD - Titusville, FL - Newport News, VA - Carthage NC

Essential Duties and Responsibilities include the following:

Primary Responsibilities

• Design and develop microservices for distributed tactical systems using Python, Go, and/or Java
• Build responsive user interfaces for tactical operations using React, TypeScript, and modern web frameworks
• Implement RESTful and gRPC APIs for inter-service communication
• Develop data persistence layers for disconnected/intermittent operations
• Integrate with military systems and standards (TAK servers, CoT messages, MIL-STD-2525)
• Creatively optimize the reuse or integration of existing COTS or FOSS/OSS
• Write comprehensive unit and integration tests
• Mentor junior and mid-level developers through code reviews, pair programming, and technical guidance.

Secondary Responsibilities

• Support basic DevOps tasks including containerization and CI/CD pipeline maintenance
• Create tools and interfaces for system integration testing
• Assist with deployment automation and configuration management
• Contribute to API documentation and developer guides

Minimum Requirements

Experience:

• 5+ years full-stack development experience
• Proficiency in backend languages (Python, Go, Java, or C++)
• Strong frontend skills (React, TypeScript, modern JavaScript)
• Experience with microservices architecture and distributed systems
• Hands-on experience with Docker and container orchestration
• Database expertise (PostgreSQL, MongoDB, Redis, time-series DBs)
• Experience with message queuing systems (RabbitMQ, Kafka, MQTT. etc.)
• Strong understanding of RESTful and gRPC API design
• Git version control and collaborative development experience
• Experience with secure coding practices (e.g., OWASP Top 10) and familiarity with SAST/DAST tools
• Familiarity with cloud platforms (AWS, Azure) and hybrid cloud/edge architectures

• Experience with tactical military systems or defense contractors
• Familiarity with TAK (Team Awareness Kit) ecosystem
• Knowledge of geospatial systems and coordinate transformations
• Experience with offline-first and edge computing architectures
• Basic understanding of DevOps practices and CI/CD pipelines
• Contributions to open-source projects
• Experience with Agile/Scrum methodologies

Education:

• Bachelor's degree in Computer Science, Information Technology, or related field

Clearance:

• Must be eligible for Secret security clearance
• US Citizenship required

• You optimize for constrained environments, not just cloud scale
• You write clear, maintainable code that others can understand and modify
• You're comfortable with ambiguity and can work from high-level requirements
• You document as you code, not as an afterthought
• You can debug across the full stack, from database to browser

Why Join MAG:

• Work on meaningful problems that directly impact national security
• Small, elite team where your contributions matter immediately
• Access to cutting-edge hardware and technologies
• Rapid prototyping environment - see your ideas deployed in weeks
• Direct interaction with end users and field deployments
• Professional development and conference attendance support
• Flexible work arrangements with occasional field exercises
• Opportunity to shape the future of tactical edge computing