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Senior Software Engineer Contract Jobs in Seattle, WA

Protingent

Senior Software Engineer

Bellevue, WA · On-site

$77.14 - $130.87/hr

  • Medical

  • Retirement

  • PTO

Senior Software Engineer Protingent Staffing has an exciting contract Senior Software Engineer opportunity. Responsibilities * Design, implement, document, and test software based on formally defined ...

247Hire

Senior Software Engineer

Seattle, WA · On-site

$120 - $150/hr

Senior Software Engineer Responsibilities: * Lead the design, development, and testing of robust systems and services. * Contribute to shaping the technical architecture of the product. * Translate ...

Protingent

Senior Software Engineer

Bellevue, WA · On-site

$56 - $95/hr

  • Medical

  • Retirement

  • PTO

Protingent Staffing has an exciting contract Senior Software Engineer opportunity. Job Responsibilities: * Design, implement, document, and test software based on formally defined requirements and ...

ApTask Global Workforce

Senior Software Engineer

Seatac, WA · On-site

$100/hr

  • Medical

  • Dental

  • Vision

  • Life

Aptask Global Workforce (AGW) is seeking a Senior Software Engineer for a contract position with a ... This is a 12+ month contract opportunity. As a subject matter expert in full-stack software ...

YO AI Labs

Senior Software Engineer - Remote

Seattle, WA · Remote

$139K - $183K/yr

Senior Software Engineer Job Type: Contract Location: Remote Job Summary: In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn ...

Whatnot

Senior Software Engineer

Seattle, WA · On-site

$140 - $210/hr

  • Medical

  • Dental

  • Vision

  • Retirement

Role We're hiring Senior Software Engineers across multiple engineering pillars at Whatnot -- including Buyer Growth, Seller Growth, Trust & Risk, Discovery & Personalization, Search, Customer ...

New

Microsoft

Senior Software Engineer

Redmond, WA · On-site

$137K - $180K/yr

As a Senior Software Engineer, you will design, build, and operate software that helps teams launch and manage products across Microsoft. You will work closely with partner engineers, product ...

Boeing

Senior Software Engineer

Seattle, WA · On-site

$139K - $183K/yr

  • Medical

  • Life

  • Retirement

Senior Software Engineer Company: The Boeing Company The Boeing Company is looking for a Senior Software Engineer to lead the evolution of the Boeing Translation Engine (BTE), our core framework for ...

Blue Origin LLC

Senior Software Engineer - TeraWave

Seattle, WA · On-site

$165 - $231/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

## Senior Software Engineer - TeraWaveApplylocations: Greater Seattle Areatime type: Full timeposted on: Posted Todayjob requisition id: R69786Application close date:Applications will be accepted on an ...

Kymeta Corporation

Senior Software Engineer

Redmond, WA · On-site

$137K - $180K/yr

They are seeking a Senior Software Engineer with strong experience in embedded systems development and real-time software engineering to design, develop, and optimize software that interfaces closely ...

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All JobsSoftware Engineer Contract JobsSenior Software Engineer Contract JobsSenior Software Engineer Contract Jobs in Seattle, WA

Senior Software Engineer Contract information

See Seattle, WA salary details

$85.9K

$163.1K

$218.5K

How much do senior software engineer contract jobs pay per year?

As of Aug 13, 2026, the average yearly pay for senior software engineer contract in Seattle, WA is $163,070.00, according to ZipRecruiter salary data. Most workers in this role earn between $139,400.00 and $183,800.00 per year, depending on experience, location, and employer.

What is a senior software engineer contract?

A Senior Software Engineer Contract refers to a temporary employment agreement where an experienced software engineer is hired for a specific period or project rather than as a permanent employee. These professionals bring advanced technical skills and leadership to design, develop, and maintain complex software systems. Contract roles often focus on delivering specialized expertise, meeting project deadlines, and providing mentorship to junior team members. Compensation and benefits may differ from full-time positions, and contracts can range from a few months to a year or more depending on the project's scope.

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

To thrive as a Senior Software Engineer on contract, you need advanced programming skills, a strong understanding of software architecture, and several years of experience, often supported by a relevant degree or certifications. Proficiency with development tools like Git, CI/CD systems, cloud platforms (AWS, Azure, or Google Cloud), and familiarity with Agile methodologies are typically expected. Outstanding problem-solving abilities, effective communication, and adaptability are crucial soft skills for collaborating with diverse teams and adjusting to new projects quickly. These skills and qualities enable contract engineers to deliver high-quality solutions efficiently, integrate smoothly into client environments, and meet project goals within tight timelines.

What are senior software engineer contract jobs?

Senior software engineer contract jobs involve working on software engineering projects on a temporary contract basis. Your duties and responsibilities in this career vary depending on the needs of each client. In general, you utilize your coding skills and computer program knowledge to create software, applications, or operating systems. You typically work with a software company or information technology organization. As a contractor, you work with clients to assess their needs and create or update software or systems to meet the needs of each client.

What are the typical challenges faced by senior software engineers working on contract assignments?

Senior Software Engineers on contract often navigate challenges such as quickly acclimating to new codebases and team cultures, managing time effectively across multiple projects, and balancing client expectations with technical feasibility. Since contracts are temporary, there may be less onboarding support and less time to build deep relationships with permanent team members, making communication skills especially important. However, this environment also allows for exposure to diverse technologies and problem-solving scenarios, which can significantly enhance your expertise and professional network.

What is the difference between Senior Software Engineer Contract vs Software Engineer?

AspectSenior Software Engineer ContractSoftware Engineer
CredentialsBachelor's degree in CS or related field, experience, possibly certificationsBachelor's degree in CS or related field, entry to mid-level experience
Work EnvironmentProject-based, temporary contracts, often freelance or consultingFull-time employment, ongoing projects within companies
Employer & Industry UsageTech firms, startups, consulting agenciesTech companies, software development firms, startups
Search & Comparison IntentLooking for contract roles, freelance opportunities, project-based workSeeking permanent positions, career growth, or full-time roles

The main difference between a Senior Software Engineer Contract and a Software Engineer lies in employment type and work setup. Contract roles are temporary, project-focused, and often freelance, while Software Engineers typically work full-time within a company. Both roles require similar technical skills and credentials, but their work arrangements and career paths differ.

More about Senior Software Engineer Contract jobs
What are the most commonly searched types of Senior Software Engineer jobs in Seattle, WA? The most popular types of Senior Software Engineer jobs in Seattle, WA are:
What are popular job titles related to Senior Software Engineer Contract jobs in Seattle, WA? For Senior Software Engineer Contract jobs in Seattle, WA, the most frequently searched job titles are:
What job categories do people searching Senior Software Engineer Contract jobs in Seattle, WA look for? The top searched job categories for Senior Software Engineer Contract jobs in Seattle, WA are:
What cities near Seattle, WA are hiring for Senior Software Engineer Contract jobs? Cities near Seattle, WA with the most Senior Software Engineer Contract job openings:
Senior Software Engineer Contract jobs near you
Infographic showing various Senior Software Engineer Contract job openings in Seattle, WA as of August 2026, with employment types broken down into 82% Full Time, and 18% Contract. Highlights an 100% In-person job distribution, with an average salary of $163,070 per year, or $78.4 per hour.

Senior Software Engineer

Protingent

Bellevue, WA • On-site

$77.14 - $130.87/hr

Other

Medical, Retirement, PTO

Re-posted 25 days ago

Job description

Senior Software Engineer

Protingent Staffing has an exciting contract Senior Software Engineer opportunity.

Responsibilities
  • Design, implement, document, and test software based on formally defined requirements and bug reports from the in‑house user base.
  • Design and implement refactorizations and maintenance to maximize near‑ and long‑term productivity of users and developers.
  • Identify and prioritize tasks without them being explicitly assigned to you.
  • Support verification and validation efforts to prove that the code meets specifications and is correct.
  • Systematically identify performance or productivity bottlenecks; design and implement solutions to eliminate them.
  • Perform administrative data management operations on the backend based on user and management needs.
  • Understand and translate new feature requests into formal software requirements.
  • Train and support reactor designers to use the software system.
  • Provide mentoring to other developers.
  • Support software build and testing systems (e.g., Jenkins and related dashboards).
  • Support server configuration and maintenance needs.
  • Facilitate design reviews for ongoing developments to keep the review/approval process as productive as possible.
  • Review proposed code changes and provide detailed feedback before allowing it to go live.
  • Ensure compliance with quality standards and regulatory requirements for software.
Qualifications
  • Bachelor’s degree in an applicable field of Engineering.
  • 6+ years of relevant experience in web application development.
  • Advanced programming skills in Python and JavaScript.
  • 3+ years in‑depth experience with Django and DRF.
  • 3+ years in‑depth experience with at least one JavaScript framework such as Vue3.
  • 3+ years regularly writing software tests.
  • Advanced capabilities with software development tools, including Git, IDEs, profilers, debuggers, test frameworks, and packaging tools.
  • Ability to focus and comfort with delivering a challenging project under evolving conditions and rapid‑paced development.
  • Professionalism to work within the robust regulatory environment of nuclear reactor design and construction, with a strong commitment to software best practices.
  • Strong communication skills desired.
  • Actual position starting level and title will be determined based on assessment of qualifications.
Employment Details
  • Employment type: Contract
  • Pay Rate Range: $56‑$95 per hour
  • Location: Bellevue, WA or 100% Remote
  • Travel Required: 0‑5%
  • Export control regulations require candidates to be a U.S. Citizen, U.S. Legal Permanent Resident, or of a protected person status.
Benefits

Protingent offers competitive salaries, insurance plan options (HDHP plan or POS plan), education/certification reimbursement, pre‑tax commuter benefits, Paid Time Off (PTO), and an administered 401k plan.

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