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Senior Back End Developer Jobs in London, ON (NOW HIRING)

Proton

Senior .NET Developer (Desktop/SDK)

London, ON · On-site

While this position is not a "full-stack" position, you will be expected to collaborate with backend engineers to drive any necessary changes and/or new features needed for the core of our desktop ...

Proton

Senior Foundation Engineer (Drive)

London, ON · On-site

As a Senior Drive Foundation Engineer, you will play a crucial role in designing, implementing, and ... Work closely with backend, frontend, mobile and desktop developers to integrate core libraries ...

All JobsBack End Developer JobsSenior Back End Developer JobsSenior Back End Developer Jobs in London, ON

Senior Back End Developer information

See London, ON salary details

$51.8K

$111.7K

$151.5K

How much do senior back end developer jobs pay per year?

As of Aug 26, 2026, the average yearly pay for senior back end developer in London, ON is $111,667.00, according to ZipRecruiter salary data. Most workers in this role earn between $93,653.00 and $127,317.00 per year, depending on experience, location, and employer.

What is a senior back end developer?

Senior Back End Developers are experienced software engineers who specialize in building and maintaining the server-side logic, databases, and APIs that power web and mobile applications. They collaborate with front end developers and other team members to ensure seamless integration and optimal performance of applications. Their responsibilities often include designing system architecture, optimizing code for scalability, implementing security best practices, and mentoring junior developers. Senior Back End Developers typically have several years of experience and a deep understanding of programming languages such as Java, Python, Ruby, or Node.js.

What are the key skills and qualifications needed to thrive as a senior back end developer?

To thrive as a Senior Back End Developer, you need advanced programming skills (such as in Python, Java, or Node.js), a deep understanding of server-side architecture, and experience with databases, often backed by a degree in computer science or related fields. Familiarity with frameworks (like Django or Spring), RESTful APIs, cloud platforms (AWS, Azure, or GCP), and version control systems (such as Git) is typically required, along with relevant certifications. Strong problem-solving, collaboration, and communication skills help you deliver robust solutions and mentor junior developers. These skills ensure scalable, secure, and maintainable back-end systems that are vital for reliable business operations.

What are some common challenges senior back end developers face when working on large-scale systems?

Senior Back End Developers often encounter challenges such as ensuring system scalability, maintaining high performance under increased load, and designing robust APIs that can evolve over time. They must also address complex data consistency issues and integrate with multiple third-party services or legacy systems. Collaborating closely with front end, DevOps, and QA teams is crucial to align on architecture decisions and streamline deployment processes, making strong communication and problem-solving skills essential.

What is the difference between Senior Back End Developer vs Backend Engineer?

AspectSenior Back End DeveloperBackend Engineer
Required CredentialsBachelor's in CS or related field, experience in backend developmentBachelor's in CS or related field, experience in backend systems
Work EnvironmentCollaborates with front-end developers, product managers, and QA teamsWorks on server-side logic, database integration, and API development
Industry UsageCommon in tech companies, startups, and enterprise software firmsUsed across similar industries, often interchangeably with Senior Back End Developer

Both roles require similar technical skills and educational backgrounds, focusing on server-side development. The main difference lies in the seniority level and scope of responsibilities, with Senior Back End Developers typically taking on more leadership and complex project tasks compared to Backend Engineers.

What cities near London, ON are hiring for Senior Back End Developer jobs?

Cities near London, ON with the most Senior Back End Developer job openings:

Senior Back End Developer jobs near you
Infographic showing various Senior Back End Developer job openings in London, ON as of August 2026, with employment types broken down into 85% Full Time, and 15% Contract. Highlights an 71% In-person, 2% Hybrid, and 27% Remote job distribution, with an average salary of $111,667 per year, or $53.7 per hour.

Senior Backend Developer | Agency | Hybrid or remote ON | $100-110K

White Bay

London, ON • On-site, Remote

$90K - $110K/yr

Full-time

Posted yesterday

New

Job description

The Company


An established and forward-thinking digital agency is seeking a Senior Backend Developer to join its growing team in London, Ontario. Known for delivering enterprise-grade digital solutions for mid-market and enterprise organizations, this innovative firm combines strategy, technology, and creativity to build high-performing web applications and marketing technology platforms. Collaboration, continuous learning, and emerging technologies—including AI-powered development workflows—are at the heart of its culture.


The Role


This is an opportunity for an experienced backend developer to lead the design, development, and delivery of scalable web applications and integrations. Working alongside designers, UX specialists, product owners, and fellow developers, the successful candidate will build robust PHP-based solutions, architect API-driven systems, mentor team members, and help shape development best practices. This role also embraces AI and automation to improve efficiency while maintaining accountability for code quality and technical excellence.


Responsibilities


  • Design, develop, maintain, and optimize enterprise web applications using PHP and CMS platforms such as WordPress.
  • Build and integrate REST, GraphQL, SOAP, and webhook-based APIs.
  • Develop headless CMS and API-first architectures.
  • Write clean, reusable, well-tested code that meets established quality standards.
  • Utilize AI and automation tools to improve development workflows and accelerate delivery.
  • Collaborate with cross-functional teams to deliver innovative digital solutions.
  • Provide technical leadership, mentorship, and architectural guidance to developers.
  • Troubleshoot complex technical challenges and recommend scalable solutions.
  • Identify project risks, communicate progress, and contribute to Agile Scrum ceremonies.
  • Champion continuous improvement across development processes and best practices.


Requirements


  • 6+ years of professional PHP development experience.
  • 4+ years designing API-driven and headless CMS solutions.
  • Strong experience with REST, GraphQL, SOAP, web services, and system integrations.
  • Advanced knowledge of MySQL and database optimization.
  • Experience architecting scalable software solutions and integration patterns.
  • Proficiency with Laravel, Symfony, CodeIgniter, or similar PHP frameworks.
  • Experience with Git, unit testing, CI practices, and Agile development.
  • Strong understanding of AI-assisted development, automation tools, and workflow platforms.
  • Knowledge of web security, WCAG standards, and modern software design principles.
  • University degree or college diploma in Software Development, Computer Science, Engineering, or a related discipline.



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