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Senior Software Developer Jobs in Cornwall, ON (NOW HIRING)

Micro1

Remote Senior Software Engineer

Les Coteaux, QC · Remote

Senior Software Engineer $50 - $100/hourpay Required Skills Python3 JAVA Rust Algorithms Basics C++ Typescript bug fixing feature implementation codebase refactoring performance optimization About ...

Micro1

Remote Senior Software Engineer

Hamilton, ON · Remote

Senior Software Engineer $50 - $100/hourpay Required Skills Python3 JAVA Rust Algorithms Basics C++ Typescript bug fixing feature implementation codebase refactoring performance optimization About ...

Micro1

Remote GitHub Contributor

Les Coteaux, QC · Remote

Remote micro1 is engaging expert Senior Software Engineers to support a customer's innovative project. In this role, you'll apply your expertise to help train next-generation AI systems. Your work ...

Micro1

Remote GitHub Contributor

Cornwall, ON · Remote

Remote micro1 is engaging expert Senior Software Engineers to support a customer's innovative project. In this role, you'll apply your expertise to help train next-generation AI systems. Your work ...

Micro1

Remote GitHub Contributor

Hamilton, ON · Remote

Remote micro1 is engaging expert Senior Software Engineers to support a customer's innovative project. In this role, you'll apply your expertise to help train next-generation AI systems. Your work ...

Providius

Software Engineer

Hamilton, ON · On-site

Strong fundamentals in computer science and software engineering * Ability to take ambiguous problems and turn them into working, maintainable solutions * Comfortable working across different parts ...

Spark Power

Senior Civil/Structural Engineer

Hamilton, ON · On-site

$100K - $120K/yr

Senior Civil/Structural Engineer Spark Power is looking for a Senior Civil/Structural Engineer to ... Must have a working knowledge and ability to use programs such as structural design software S ...

New

Egis Group

Senior Planner

Hamilton, ON · On-site

In this senior-level role, you will be responsible for developing, managing, and optimizing ... and engineering coordination. * Proficiency with project management software (Primavera P6 ...

Wood Plc

Senior Geochemist

Hamilton, ON · On-site +1

Our team includes geochemists with backgrounds in geology, aqueous geochemistry and engineering ... Demonstrated abilities with geochemical and water quality modeling using industry-standard software ...

Stryker

Senior Product Manager (Hybrid)

Hamilton, ON · On-site +1

CA$97K - CA$129K/yr

As a Senior Product Manager supporting Stryker's Smart Care portfolio, you will help shape the ... Experience collaborating with engineering, software development, data analytics, or technology ...

AECOM

Senior Fluvial Geomorphologist

Hamilton, ON · On-site

The fluvial geomorphologist will work with AECOM's team of geomorphologists, hydraulic engineers ... Familiarity with GIS and CAD software * Knowledge of fluvial form, processes, and functions ...

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All JobsSoftware Developer JobsSenior Software Developer JobsSenior Software Developer Jobs in Cornwall, ON

Senior Software Developer information

See Cornwall, ON salary details

$50.8K

$111.1K

$157.4K

How much do senior software developer jobs pay per year?

As of Aug 10, 2026, the average yearly pay for senior software developer in Cornwall, ON is $111,112.00, according to ZipRecruiter salary data. Most workers in this role earn between $91,992.00 and $125,883.00 per year, depending on experience, location, and employer.

What skills and qualifications are needed to thrive as a senior software developer?

To thrive as a Senior Software Developer, you need deep expertise in programming languages, software architecture, and problem-solving, typically backed by a bachelor’s degree in computer science or a related field. Proficiency with development frameworks, version control systems like Git, and cloud platforms such as AWS or Azure is standard, and certifications in these areas can be beneficial. Leadership, strong communication, and mentoring abilities set standout candidates apart in this role. These skills ensure that complex projects are delivered efficiently, code quality is maintained, and junior team members are effectively guided for overall team success.

What does a senior software developer do?

As a Senior Software Developer, you’ll typically be responsible for leading complex development projects, designing technical solutions, and mentoring junior team members. Daily tasks often include writing and reviewing code, participating in architecture discussions, collaborating with cross-functional teams (such as QA, product management, and DevOps), and troubleshooting high-level technical issues. You may also be involved in setting coding standards, conducting code reviews, and helping to plan sprints or project roadmaps.

What is a senior software developer?

Senior Software Developers are experienced professionals who design, develop, and maintain complex software applications. They often lead development teams, mentor junior developers, and make critical architectural decisions. Their responsibilities include writing high-quality code, troubleshooting technical issues, and ensuring that software projects meet performance and security standards. With deep expertise in programming languages and software engineering principles, they play a key role in delivering successful technology solutions for organizations.

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

AspectSenior Software DeveloperSoftware Engineer
CredentialsBachelor's degree in CS or related field; experience often 5+ yearsBachelor's or higher in CS or related field; similar experience levels
Work EnvironmentCollaborates on complex projects, mentors juniors, leads technical effortsDesigns, develops, tests software; may work on specific modules or systems
Industry UsageCommonly used in tech companies, startups, and enterprise firmsWidely used across industries, often interchangeable with developer roles

The main difference is that Senior Software Developers typically have more experience, leadership responsibilities, and focus on complex project oversight, while Software Engineers may focus more on designing and implementing software solutions. Both roles require similar credentials and are integral in software development teams, but Senior Software Developers often take on mentorship and strategic tasks.

More about Senior Software Developer jobs
What are popular job titles related to Senior Software Developer jobs in Cornwall, ON? For Senior Software Developer jobs in Cornwall, ON, the most frequently searched job titles are:
What cities near Cornwall, ON are hiring for Senior Software Developer jobs? Cities near Cornwall, ON with the most Senior Software Developer job openings:
Senior Software Developer jobs near you
Infographic showing various Senior Software Developer job openings in Cornwall, ON as of July 2026, with employment types broken down into 87% Full Time, 10% Part Time, and 3% Contract. Highlights an 88% Physical, 3% Hybrid, and 9% Remote job distribution, with an average salary of $111,112 per year, or $53.4 per hour.

Remote Senior Software Engineer

Micro1

Les Coteaux, QC • Remote

Full-time

This job post has expired today. Applications are no longer accepted.

Job description

Senior Software Engineer
$50 - $100/hourpay
Required Skills
Python3
JAVA
Rust
Algorithms
Basics C++
Typescript
bug fixing
feature implementation
codebase refactoring
performance optimization
About micro1
micro1 is the leading AI data lab for training frontier models and evaluating AI agents. Experts contribute their diverse subject matter knowledge across domains such as finance, healthcare, STEM engineering, and more. micro1 transforms that real-world expertise into high-quality training data, evaluations, and feedback loops that improve how AI systems learn, reason, and perform.

Our platform identifies and vets top talent through an AI recruiter, enabling high-quality expert contributions at scale. We aim to enable 1 billion people to do meaningful work by applying their expertise to AI. As our global expert network grows, micro1 is building the human intelligence layer for frontier AI.

Job Title: Senior Software Engineer


Job Type: Contractor (~15 hrs a week)


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.


As an expert you will be creating Reinforcement Learning Environments which test an AI model’s ability to solve complex software engineering problems using Model Context Protocol (MCP) tools. Tasks may involve fixing bugs, implementing features, refactoring code, or optimizing performance while requiring agents to discover and reason over information from real MCP servers. You will design reproducible environments, deterministic verification, and golden reference solutions that accurately measure both MCP tool use and software engineering ability.



Required Skills and Qualifications:

  1. Proficiency in C++, Python, JAVA, GoLang, Typescript, or Rust.
  2. Deep understanding of algorithms, data structures, and performance tuning.
  3. Demonstrated experience in debugging complex software issues and delivering maintainable solutions.
  4. Strong background in feature development and codebase refactoring.
  5. Proven ability to optimize software for performance and scalability.
  6. Exceptional written and verbal communication skills, with a keen attention to detail.
  7. Track record of success in collaborative, cross-functional teams, ideally in remote settings.



Preferred Qualifications:

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


Process:

  1. Apply to the role, filling out the screening questions
  2. Complete AI Interview (approx. 30 minutes)
  3. Technical Assessment (Tentative)
  4. Hiring Manager review


Compensation Structure

Compensation is output-based; experts are paid per task that meets the project specifications. The time required to complete work may vary depending on the expert’s experience and workflow. Minimum submission requirements apply. Experts must submit a minimum of tasks per week.


Start Timeline & Availability

We typically fill roles within 48 hours and are looking for experts ready to jump in right away. If selected, we expect you to start your first tasks within 24–48 hours of completing onboarding.

Apply