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Senior Software Engineer Contract Jobs in Ontario

Det Norske Veritas

Sr. Software Engineer

Toronto, ON · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

The Senior Software Engineer is responsible for designing, developing, testing, deploying, and supporting production-grade software products and shared platform capabilities within DNV's Digital ...

Guidewire Software

Senior Software Engineer

Toronto, ON

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

As a Senior FullStack Software Engineer, you will design and build elegant, highimpact capabilities for insurance content transformation and modeling, advancing Guidewire's shift toward AIdriven ...

Guidewire Software

Senior Software Engineer

Mississauga, ON

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

As a Senior FullStack Software Engineer, you will design and build elegant, highimpact capabilities for insurance content transformation and modeling, advancing Guidewire's shift toward AIdriven ...

Curinos Inc

Senior Software Engineer

Toronto, ON · On-site

CA$130K - CA$140K/yr

  • PTO

Are you a passionate Senior Software Engineer looking to make a significant impact in the fintech space? Join Curinos, where you will play a pivotal role in shaping the future of B2B SaaS ...

Sitero LLC

Senior Software Engineer

Mississauga, ON · On-site +1

  • Medical

  • Life

  • Retirement

  • PTO

Senior Software Engineer Location: Mississauga, Ontario (Hybrid). 3x per week in office, 2x per week remote Function: Engineering ESSENTIAL DUTIES AND RESPONSIBILITIES: Full Stack Development

Sitero LLC

Senior Software Engineer

Mississauga, ON · On-site

  • Medical

  • Life

  • Retirement

  • PTO

Senior Software Engineer Location: Mississauga, Ontario (Hybrid). 3x per week in office, 2x per week remote Function: Engineering ESSENTIAL DUTIES AND RESPONSIBILITIES: Full Stack Development

Guidewire Software

Senior Software Engineer

Toronto, ON · On-site

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Summary We are growing our engineering team and are looking for an experienced, product-minded Senior Software Engineer to help build and scale our platform. This role is ideal for someone who enjoys ...

Guidewire Software

Senior Software Engineer

Mississauga, ON · On-site

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Summary We are growing our engineering team and are looking for an experienced, product-minded Senior Software Engineer to help build and scale our platform. This role is ideal for someone who enjoys ...

Clockwork.io

CA$140K - CA$210K/yr

We are currently seeking senior software engineers who will design the next generation of network acceleration software. Stay a nanosecond ahead of everyone else by joining our team of engineers in ...

Nasdaq

Senior Software Engineer

Toronto, ON · Hybrid

CA$121K - CA$170K/yr

As a Senior Software Engineer reporting to the Sr. Director of Software Development, you'll play a critical role in building the next generation of market data streaming products that empower clients ...

Guidewire Software

Senior Software Engineer

Toronto, ON · On-site

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

In this Senior Software Engineer role, you'll be the engineering front line for complex customer scenarios-triaging production issues, engineering hotfixes, and building the tools that keep our ...

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All JobsSoftware Engineer Contract JobsSenior Software Engineer Contract JobsSenior Software Engineer Contract Jobs in Ontario

Senior Software Engineer Contract information

See Ontario salary details

$19

$64

$98

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

As of Aug 18, 2026, the average hourly pay for senior software engineer contract in Ontario is $64.23, according to ZipRecruiter salary data. Most workers in this role earn between $50.96 and $75.00 per hour, 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 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 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 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 Ontario?

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

What are popular job titles related to Senior Software Engineer Contract jobs in Ontario?

For Senior Software Engineer Contract jobs in Ontario, the most frequently searched job titles are:

What job categories do people searching Senior Software Engineer Contract jobs in Ontario look for?

The top searched job categories for Senior Software Engineer Contract jobs in Ontario are:

What cities in Ontario are hiring for Senior Software Engineer Contract jobs?

Cities in Ontario 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 Ontario as of August 2026, with employment types broken down into 1% As Needed, 80% Full Time, 16% Part Time, and 3% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $133,592 per year, or $64.2 per hour.

Senior Software Engineer - Remote

YO AI Labs

Toronto, ON • Remote

Full-time

Re-posted 12 days ago

Job description

Job Title: 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, reason, and perform through high-quality, real-world input. No prior experience in AI is required — your domain knowledge is what matters.

We are seeking strong Software Engineers to join our customer's team with expertise in Python3, Java, Rust, Go, C++, or TypeScript. This is a unique opportunity to directly impact the next generation of AI by leveraging your advanced engineering skills in a dynamic, remote setting.

Required Skills and Qualifications:

  • Proficiency in Python3, Java, Rust, or TypeScript, with additional experience in C++ or Go considered a strong asset.
  • Deep understanding of algorithms, data structures, and performance tuning.
  • Demonstrated experience in debugging complex software issues and delivering maintainable solutions.
  • Strong background in feature development and codebase refactoring.
  • Proven ability to optimize software for performance and scalability.
  • Exceptional written and verbal communication skills, with a keen attention to detail.
  • Track record of success in collaborative, cross-functional teams, ideally in remote settings.


Preferred Qualifications:

  • Previous experience working on large-scale, distributed codebases.
  • Familiarity with modern AI or machine learning systems is a plus, though not required.
  • Background in participating in rigorous code reviews and contributing to the development of software best practices.