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Freelance Senior Software Engineer Jobs in Washington

VTG

Senior Software Engineer

Fort George G Meade, MD · On-site

$210K - $250K/yr

The Senior Software Engineer will design, develop, test, integrate, and maintain scalable, highly available software solutions supporting mission-critical environments. This position requires ...

GridPoint

Senior Software Engineer

Reston, VA · On-site

$127K - $168K/yr

The Senior Software Engineer will implement solutions for complex software products and features, ensuring high quality through design, implementation, and testing. Responsibilities : • participate ...

Exiger

Senior Software Engineer

Mclean, VA · Hybrid

$123K - $163K/yr

Senior Software Engineer Location: McLean, VA or Richmond, VA Work Environment: Hybrid Role Summary: As a Senior Software Engineer at Exiger, you will be responsible for designing and developing ...

Piper Companies

Senior Software Engineer

Springfield, VA · On-site

$140K - $160K/yr

As a Senior Software Engineer, you will play a key role in supporting the Geospatial Intelligence Agency (NGA) by designing, developing, and maintaining geospatial intelligence applications. Your ...

THOMSON REUTERS

Senior Software Engineer

Mclean, VA · On-site

$123K - $163K/yr

As a Senior Software Engineer , you will also contribute to a variety of areas including: * Leading projects and acting as a mentor to less experienced developers * Collaborating with the TRSS ...

Thomson Reuters

Senior Software Engineer

Mclean, VA · On-site +1

$123K - $163K/yr

As a Senior Software Engineer , you will also contribute to a variety of areas including: * Leading projects and acting as a mentor to less experienced developers * Collaborating with the TRSS ...

VTG

Senior Software Engineer

Fort George G Meade, MD

$210K - $250K/yr

The Senior Software Engineer will design, develop, test, integrate, and maintain scalable, highly available software solutions supporting mission-critical environments. This position requires ...

Humana

Senior Software Engineer

Washington, DC · On-site +1

$138K - $182K/yr

The Senior Software Engineer work assignments involve moderately complex to complex issues where the analysis of situations or data requires an in-depth evaluation of variable factors. This position ...

Humana

Senior Software Engineer

Washington, DC · On-site +1

$138K - $182K/yr

The Senior Software Engineer work assignments involve moderately complex to complex issues where the analysis of situations or data requires an in-depth evaluation of variable factors. This position ...

Humana

Senior Software Engineer

Washington, DC · On-site +1

$138K - $182K/yr

The Senior Software Engineer work assignments involve moderately complex to complex issues where the analysis of situations or data requires an in-depth evaluation of variable factors. This position ...

Prevail Recruiting

Senior Software Engineer

Washington, DC · Remote

$130K - $165K/yr

About the Opportunity A rapidly growing healthcare technology company is seeking a Senior Software Engineer to help build and scale a mission-critical software platform used by millions of patients ...

MasterCard

Senior Software Engineer

Arlington, VA

$140K - $185K/yr

Title and Summary Senior Software Engineer Who is Mastercard? Mastercard is a global technology company in the payments industry. Our mission is to connect and power an inclusive digital economy that ...

RIVIDIUM

Senior Software Engineer

Hanover, MD

$120K - $159K/yr

RiVidium Inc. is seeking a Senior Software Engineer to support mission-critical software development efforts within a Department of Defense (DoD) environment. The selected candidate will design ...

Platinum Technologies

Senior Software Engineer

Herndon, VA · On-site

$126K - $166K/yr

The Senior Software Engineer serves as a key contributor to the design, development, and sustainment of mission-critical software solutions that enable semantic data integration, knowledge management ...

Platinum Technologies

Senior Software Engineer

Herndon, VA · On-site

$140 - $180/hr

The Senior Software Engineer serves as a key contributor to the design, development, and sustainment of mission-critical software solutions that enable semantic data integration, knowledge management ...

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Freelance Senior Software Engineer information

What is a freelance senior software engineer?

Freelance Senior Software Engineers are highly experienced software professionals who work independently rather than as full-time employees of a single company. They take on contract-based projects for various clients, often leading development teams, architecting systems, and solving complex technical problems. Their responsibilities typically include coding, reviewing code, mentoring junior engineers, and ensuring that software solutions meet client requirements. Freelance senior engineers offer flexibility and specialized expertise, making them a valuable asset for businesses needing advanced software solutions without long-term commitments.

What are some common challenges faced by freelance senior software engineers when managing multiple client projects simultaneously?

Freelance Senior Software Engineers often juggle multiple projects for different clients, which can present challenges such as balancing competing deadlines, adapting to varying coding standards, and maintaining clear communication across diverse teams. Time management and setting realistic expectations are crucial to ensure high-quality deliverables. Additionally, staying up to date with new technologies and industry best practices helps maintain a competitive edge and satisfy client requirements.

What are the key skills and qualifications needed to thrive as a freelance senior software engineer, and why are they important?

To thrive as a Freelance Senior Software Engineer, you need advanced programming expertise, strong problem-solving skills, and a proven track record in software development, often backed by a relevant degree and years of experience. Familiarity with version control systems like Git, cloud platforms such as AWS or Azure, and mastery of frameworks and languages (e.g., JavaScript, Python, Java) are crucial, along with certifications like AWS Certified Solutions Architect or Microsoft Certified: Azure Developer Associate. Outstanding communication, time management, and self-motivation are vital soft skills for independently managing projects and collaborating with diverse clients. These competencies ensure you can deliver high-quality, scalable solutions while building strong client relationships and managing multiple projects efficiently.

What is the difference between Freelance Senior Software Engineer vs Freelance Software Developer?

AspectFreelance Senior Software EngineerFreelance Software Developer
Experience LevelTypically 5+ years, with leadership and architecture skillsVaries from entry-level to mid-level, focused on coding and implementation
ResponsibilitiesDesigning systems, leading projects, mentoringWriting code, developing features, fixing bugs
CredentialsStrong portfolio, possibly certifications like AWS, ScrumPortfolio, coding skills, possibly certifications
Work EnvironmentRemote or client-site, often in tech companies or startupsRemote or client-site, in various industries

Freelance Senior Software Engineers typically have more experience, leadership responsibilities, and focus on system design, while Freelance Software Developers concentrate on coding and feature development. Both roles are in high demand in the freelance market, but the senior role often commands higher rates due to expertise and project scope.

What are the most commonly searched types of Senior Software Engineer jobs in Washington?

The most popular types of Senior Software Engineer jobs in Washington are:

What are popular job titles related to Freelance Senior Software Engineer jobs in Washington?

For Freelance Senior Software Engineer jobs in Washington, the most frequently searched job titles are:

What job categories do people searching Freelance Senior Software Engineer jobs in Washington look for?

The top searched job categories for Freelance Senior Software Engineer jobs in Washington are:

What cities in Washington are hiring for Freelance Senior Software Engineer jobs?

Cities in Washington with the most Freelance Senior Software Engineer job openings:

Freelance Senior Software Engineer jobs near you
Infographic showing various Freelance Senior Software Engineer job openings in Washington as of August 2026, with employment types broken down into 88% Full Time, 8% Part Time, and 4% Contract. Highlights an 88% Physical, 3% Hybrid, and 9% Remote job distribution.

Senior Software Engineer

VTG

Fort George G Meade, MD • On-site

$210K - $250K/yr

Full-time

Re-posted 23 days ago

Job description

Overview
VTG is seeking an experienced and adaptable Senior Software Engineer to join our team in support of a mission-focused customer deploying cutting-edge systems.
The Senior Software Engineer will design, develop, test, integrate, and maintain scalable, highly available software solutions supporting mission-critical environments. This position requires extensive full-stack software engineering experience, with deep expertise in JavaScript, TypeScript, React, Java, and the Spring Framework.
What will you do?
  • Analyze user and mission requirements to derive software design, interface, and performance requirements.
  • Design, develop, modify, integrate, test, and maintain mission-critical software systems.
  • Develop scalable, highly available applications using modern software architecture and system design principles.
  • Design and develop full-stack software solutions using JavaScript, TypeScript, React, Java, and the Spring Framework.
  • Debug, troubleshoot, and correct defects in existing software applications using languages such as Java, Python, Rust, C++, JavaScript, and TypeScript.
  • Collaborate with systems engineers and hardware engineers to derive software requirements and understand project limitations, system capabilities, performance requirements, and interfaces.
  • Design and modify software systems using engineering analysis and mathematical models to evaluate system performance, design outcomes, and potential impacts.
  • Develop and execute test procedures for software components.
  • Create and maintain Docker containers and support application deployments within Kubernetes environments.
  • Develop automation scripts to improve software development workflows, deployment processes, and operational efficiency.
  • Identify and recommend improvements to technical documentation, software development processes, and engineering standards.
  • Participate in code reviews, system integration, troubleshooting, and continuous improvement initiatives.

Do you have what it takes?
  • TS/SCI with Poly required
  • Four (4) additional years of relevant professional experience may be substituted for a bachelor's degree.
  • Ten (10) or more years of professional experience with:
    • JavaScript
    • TypeScript
    • React
    • Java
    • Spring Framework
  • Extensive experience designing, developing, testing, integrating, and maintaining enterprise software applications.
  • Experience analyzing complex user requirements and translating them into software design and performance requirements.
  • Experience designing scalable, highly available software systems.
  • Strong software debugging, troubleshooting, and defect resolution experience.
  • Experience working with modern software architecture and system design principles.
  • Ability to collaborate effectively with software engineers, systems engineers, hardware engineers, and other technical stakeholders.

VTG's estimated starting pay range is $210K-$250K annually, which is a general guideline for the geographic location. When extending an offer, VTG also considers work experience, education, skill level, market considerations and may possibly include contractual requirements which may cause an offer to fall outside of this range.

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