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Freelance Senior Software Developer Jobs in Silver Spring, MD

Black Canyon Consulting

Senior Software Developer

Bethesda, MD · On-site +1

$58.25 - $77/hr

Overview Black Canyon Consulting (BCC) is searching for a Senior Software Developer to support the National Center for Biotechnology Information (NCBI) . This opportunity is full time and onsite at ...

VTG

Senior Software Engineer

Hanover, MD

$200K - $245K/yr

Overview As a Senior Software Developer supporting mission-essential national security initiatives, you will design, develop, integrate, and maintain secure, high-performance software solutions that ...

Black Canyon Consulting

Senior Software Developer

Bethesda, MD · On-site

$58.25 - $77/hr

Overview Black Canyon Consulting (BCC) is searching for a Senior Software Developer to support the National Center for Biotechnology Information (NCBI) . This opportunity is full time and onsite at ...

VTG

Senior Software Developer

Hanover, MD

$200K - $300K/yr

Overview As a Senior Software Engineer supporting mission-essential national security initiatives, you will design, develop, integrate, and maintain secure, high-performance software solutions that ...

VT Group (VTG)

Senior Software Developer

Hanover, MD · On-site

$53.75 - $71/hr

VT Group (VTG) is seeking a Senior Software Developer to join Triaplex, Inc., a subsidiary focused on mission-critical software solutions. The role involves full life-cycle development of a Radio ...

Prescient Edge

Senior Software Developer

Bethesda, MD · On-site

$58.25 - $77/hr

Job Title Senior Software Developer Location Bethesda, MD 20800 US (Primary) Category Research, Development, and Engineering Job Type Full-Time Career Level Staff Education Master's Degree Travel ...

Prescient Edge

Senior Software Developer

Bethesda, MD · On-site

$58.25 - $77/hr

Job Title Senior Software Developer Location Bethesda, MD 20800 US (Primary) Category Research, Development, and Engineering Job Type Full-Time Career Level Staff Education Master's Degree Travel ...

Cortek Inc

Senior Software Developer

Falls Church, VA

$58.25 - $76.75/hr

Senior Software Developer Location: BUMED HQ (DHHQ Facility), 7700 Arlington Blvd, Falls Church, VA 22042 Description: CORTEK is seeking a Senior Software Developer to lead the design and development ...

Cortek Inc

Senior Software Developer

Falls Church, VA · On-site

$58.25 - $77/hr

Senior Software Developer Location: BUMED HQ (DHHQ Facility), 7700 Arlington Blvd, Falls Church, VA 22042 Description: CORTEK is seeking a Senior Software Developer to lead the design and development ...

Cortek Inc

Senior Software Developer

Falls Church, VA · On-site

$58.25 - $77/hr

Senior Software Developer Location: BUMED HQ (DHHQ Facility), 7700 Arlington Blvd, Falls Church, VA 22042 Description: CORTEK is seeking a Senior Software Developer to lead the design and development ...

VTG

Senior Software Engineer

Hanover, MD · On-site

$200K - $245K/yr

Overview As a Senior Software Developer supporting mission-essential national security initiatives, you will design, develop, integrate, and maintain secure, high-performance software solutions that ...

MSRB

Senior Software Developer

Washington, DC

$61.75 - $81.50/hr

The MSRB is seeking a Senior Software Developer who designs and delivers distributed systems. Drives architecture decisions, builds cloud-native applications, and improves legacy platforms. Focuses ...

VTG

Senior Software Developer

Hanover, MD · On-site

$200K - $245K/yr

Overview As a Senior Software Engineer supporting mission-essential national security initiatives, you will design, develop, integrate, and maintain secure, high-performance software solutions that ...

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Freelance Senior Software Developer information

See Silver Spring, MD salary details

$15

$63

$90

How much do freelance senior software developer jobs pay per hour?

As of Jul 18, 2026, the average hourly pay for freelance senior software developer in Silver Spring, MD is $63.82, according to ZipRecruiter salary data. Most workers in this role earn between $54.18 and $71.59 per hour, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a Freelance Senior Software Developer, and why are they important?

To thrive as a Freelance Senior Software Developer, you need advanced programming expertise, a robust portfolio, and significant experience with full software development lifecycles. Strong command of frameworks, version control (like Git), cloud platforms, and potentially certifications such as AWS Certified Developer or Microsoft Certified: Azure Developer are highly valuable. Exceptional communication, time management, and problem-solving abilities help you effectively collaborate with clients and manage multiple projects independently. These skills ensure you deliver high-quality, timely solutions while building a strong professional reputation in a competitive freelance market.

How do Freelance Senior Software Developers typically manage client expectations and project timelines?

Freelance Senior Software Developers often juggle multiple clients and projects, which requires clear communication and proactive expectation management. They usually begin by setting detailed project scopes, timelines, and deliverables with clients, then provide regular updates and adjust schedules as needed to accommodate changes or unforeseen challenges. Strong time management skills and transparent reporting help ensure that projects stay on track and that clients remain informed and satisfied throughout the development process.

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

AspectFreelance Senior Software DeveloperFreelance Software Engineer
CredentialsTypically requires extensive experience, advanced coding skills, and sometimes certifications like Microsoft or AWSRequires solid coding skills and experience, often with relevant certifications but generally less senior-level expertise
Work EnvironmentWorks independently or with clients directly, often on complex projects requiring leadershipWorks independently or with teams, focusing on software development tasks across various projects
Industry UsageCommonly used in consulting, freelance platforms, and project-based work requiring senior expertiseWidely used in freelance and contract roles across tech industries for development tasks

The main difference lies in experience level and project complexity. Freelance Senior Software Developers typically handle more complex projects and provide technical leadership, while Freelance Software Engineers focus on coding and development tasks across a range of project types.

What does a Freelance Senior Software Developer do?

A Freelance Senior Software Developer designs, develops, and maintains complex software systems for clients or companies on a contract basis. They often work independently, managing multiple projects, collaborating with stakeholders, and ensuring the delivery of high-quality code. Their role may include mentoring junior developers, making architectural decisions, and troubleshooting technical issues. Freelancers have the flexibility to choose their clients and projects, and they are responsible for managing their own workload, deadlines, and business operations.
Freelance Senior Software Developer jobs near you

Senior Software Developer

Black Canyon Consulting

Bethesda, MD • On-site, Remote

$58.25 - $77/hr

Other

Medical, Dental, Vision, Retirement, PTO

Posted 21 days ago

Job description

Overview

Black Canyon Consulting (BCC)  is searching for a Senior Software Developer to support the National Center for Biotechnology Information (NCBI). This opportunity is full time and onsite at the NCBI in Bethesda, MD and/or remote work.

The National Center for Biotechnology Information (NCBI) is part of the National Library of Medicine (NLM) at the National Institutes of Health (NIH).  NCBI is the world's premier biomedical center hosting over six million daily users that seek research, clinical, genetic, and other information that directly impacts biomedical research and public health - at NCBI you can literally help to accelerate cures for diseases! NCBI's wide range of applications, platforms (node, python, Django, C++, you name it) and environments (big data [petabytes], machine learning, multiple clouds) serve more users than almost any other US Government Agency according to https://analytics.usa.gov/.

We attract the best people in the business with our competitive benefits package that includes medical, dental and vision coverage, 401k plan with employer contribution, paid holidays, vacation, and tuition reimbursement. If you enjoy being a part of a high performing, professional service and technology focused organization, please apply today!

Job Description
  • The Controlled Data Access (CDA) team is responsible for developing and maintaining state of the art digital token technologies to manage users and access to the Database of Human Genotype and Phenotype (dbGaP) systems.
  • The Senior Software Developer will work with the team to develop and maintain software supporting NCBI's Controlled Data Access technologies including the Authorized Access platform and Study Registration System. NCBI's implementation of the Researcher Auth Service (RAS Clearinghouse), and the Data Repository Service (DRS).
  • The CDA team employs several technologies such as: SQL, C++, C#, Python, Java, JSON, JWT, JWS, YAML, OpenAPI, XML, XSL, HTML, CSS, and JavaScript. Our development environment is currently comprised of: Microsoft SQL Server, Linux, .Net, gmake, with git for source control, TeamCity/Jenkins for CI/CD.
Required Skills
  • 10+ years' experience and demonstrated proficiency in Object-Oriented programming using C++
  • Fluency in scripting languages such as BASH, or Python
  • Programming experience in a Linux environment.
  • Experience with Cloud technologies:
  • AWS: EC2, S3
  • GCP: GKE, Google Store
  • Ability to work with JSON and similar structured document formats
  • Experience with network programming, multi-threaded programming
  • Experience with SQL and relational databases
  • Experience with HTML, CGI and REST APIs
  • Experience with Agile development practices
  • Experience with CI/CD pipelines, unit tests, integration, and regression testing
Desired Skills
  • Understanding of theory of Capability Systems
  • Understanding of JSON Web Tokens (JWT) and JSON Web Signature (JWS)
  • Experience using cryptographic algorithms and PKI
  • Experience with keystores
  • Experience with AWS Lambda and GCP Cloud Functions
  • Experience in MSSQL stored procedures
  • Experience in multi-platform development (POSIX, .NET).
  • Experience with containers (Docker)
Job Responsibilities
  • Stay up to date with new technologies and changes to the infrastructure
  • Share your knowledge with the team and help mentor others
  • Provide expertise to other developers for the design and development of new solutions
  • Participate in cross product skill sharing activities to decrease knowledge silos
  • Develop, Test, and Deploy solutions for the product line
  • Maintain and develop code in support of the product line
  • Estimate, plan, and manage all assigned tasks and report on progress
  • Document software and systems to meet product and program requirements

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