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

Micro1

Remote Senior Software Engineer

Stratford, 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 Senior Software Engineer

Ingersoll, 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 ...

Voices

Senior Software Engineer

London, ON · Hybrid

Senior Software Engineer Location: Ontario (Hybrid - See "Hybrid Work Details" section below for more information) Position Type: Full-Time Vacancy Status: This posting is for an existing vacancy.

Voices

Senior Software Engineer

London, ON · Hybrid

Senior Software Engineer Location: Ontario (Hybrid - See "Hybrid Work Details" section below for more information) Position Type: Full-Time Vacancy Status: This posting is for an existing vacancy.

Voices

Senior Software Engineer

London, ON · Hybrid

Senior Software Engineer Location: Ontario (Hybrid - See "Hybrid Work Details" section below for more information) Position Type: Full-Time Vacancy Status: This posting is for an existing vacancy.

CARFAX

Senior Software Engineer

London, ON · On-site

Join Team CARFAX as a Senior Software Engineer Isn't it time you bragged about where you work? At CARFAX, we do, every day. We pride ourselves on being mission-focused on helping to grow a brand ...

CARFAX

Senior Software Engineer

London, ON · On-site

CA$92K - CA$136K/yr

Join Team CARFAX as a Senior Software Engineer Isn't it time you bragged about where you work? At CARFAX, we do, every day. We pride ourselves on being mission-focused on helping to grow a brand ...

Proax Technologies Ltd

Software Developer

London, ON · On-site

Work with collaborative team members in the automation industry General Description Software Developer will use their knowledge to design, create, implement, and maintain software, applications, and ...

Proax Technologies

Software Developer

London, ON · On-site

Work with collaborative team members in the automation industry General Description Software Developer will use their knowledge to design, create, implement, and maintain software, applications, and ...

Proax Technologies

Software Developer

London, ON · On-site

Work with collaborative team members in the automation industry General Description Software Developer will use their knowledge to design, create, implement, and maintain software, applications, and ...

Td

Senior Software Engineer (Mainframe)

London, ON · On-site

CA$81K - CA$115K/yr

Adhere to enterprise engineering frameworks, software development methodologies, release processes, and control standards applicable to mainframe development and delivery. * Actively identify and ...

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

Senior Software Developer information

See London, ON salary details

$45.3K

$99K

$140.3K

How much do senior software developer jobs pay per year?

As of Aug 10, 2026, the average yearly pay for senior software developer in London, ON is $99,044.00, according to ZipRecruiter salary data. Most workers in this role earn between $82,000.00 and $112,211.00 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 the most commonly searched types of Software Developer jobs in London, ON? The most popular types of Software Developer jobs in London, ON are:
What are popular job titles related to Senior Software Developer jobs in London, ON? For Senior Software Developer jobs in London, ON, the most frequently searched job titles are:
What cities near London, ON are hiring for Senior Software Developer jobs? Cities near London, ON with the most Senior Software Developer job openings:
Senior Software Developer jobs near you
Infographic showing various Senior Software Developer job openings in London, ON as of August 2026, with employment types broken down into 1% Internship, 83% Full Time, 12% Part Time, and 4% Contract. Highlights an 86% Physical, 4% Hybrid, and 10% Remote job distribution, with an average salary of $99,044 per year, or $47.6 per hour.

Remote Senior Software Engineer

Micro1

Stratford, ON • 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