450,651+ Senior Developer Java Python Jobs in Canada — Top Companies Hiring September 2026

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Senior React Developer Position

Tata Consultancy Services seeks a Senior React Developer in Mississauga, ON, to lead the creation of dynamic web applications. Combine your expertise in JavaScript and React to craft high-quality user interfaces.As a Senior Developer, you will appraise designs, translate them into efficient React code, and e ...

RQ08765 Software Developer Senior

About the job RQ08765 - Software Developer - Senior Skills and Competencies Required for Sr. Software Developer: JAVA & Webservices, Cloud Computing Experiences - 70% o Demonstrated 10+ experience in designing secure Restful/Soap APIs web services and microservices with Java/ ...

Senior Data Developer, Analytics

2 days ago Be among the first 25 applicants Get AI-powered advice on this job and more exclusive features. Job Description As a Senior Data Developer, Analytics, you will design, build, and maintain reliable data pipelines and analytics warehouse workflows that ensure accurate, ti ...

Senior Full Stack Developer

Knak Is a Mission‑driven Company Why? Because our time is limited, our competition is fierce, and our margin for error is small. For us to have the greatest impact on the world, we need to be laser focused on our core mission, which is… Empowering people to be creative. That ...

RQ09111 Software Developer Senior

About the job RQ09111 - Software Developer - Senior Description Responsibilities: Required to translate technical systems specifications into working, tested applications. This includes: developing detailed programming specifications writing and/or gene ...

RQ08293 Automation Developer Senior

About the job RQ08293 - Automation Developer - Senior Description of Responsibilities: Identifies opportunities for automation within software processes Designs and executes QA tests using scripts that automatically test functionality. Designs and writes ...

RQ08354 Software Developer Senior

About the job RQ08354 - Software Developer - Senior Description - Work with Business Analysts / UX & UI Designer / Product Manager / Cloud Architect, base on storyboard, user stories, UI/UX artefacts, solution architecture, security requirements, data models, develop application design an ...

RQ08407 Automation Developer Senior

About the job RQ08407 - Automation Developer - Senior Description of Responsibilities: Identifies opportunities for automation within software processes Designs and executes QA tests using scripts that automatically test functionality. Designs and writes ...

Senior Adobe Commerce Developer

Immediate need for a talented Senior Adobe Commerce Developer. This is a 12+ months contract opportunity with long-term potential and is located in Toronto, ON (Hybrid). Please review the job description below and contact me ASAP if you are interested. </p ...

RQ08722 Software Developer Senior

About the job RQ08722 - Software Developer - Senior Description: Responsibilities Required to translate technical systems specifications into working, tested applications. This includes: developing detailed programming specifications writing and/or generating code compiling data-driven pr ...

RQ08949 Software Developer Senior

About the job RQ08949 - Software Developer - Senior Description NOTE Assignment Type: This position is currently listed as Hybrid and consultants will be required to work onsite at the work location 3 days a week and 2 days from home, or as per schedule agreed to ...

Senior Software Developer (Rust)

The Opportunity Lastwall is a Canadian cybersecurity company focused on identity and mission‑critical operations across defense, government, and critical infrastructure. Trusted by the U.S. Department of Defense and the Government of Canada, Lastwall has spent nearly a decade securing sen ...

RQ09196 Software Developer Senior

About the job RQ09196 - Software Developer - Senior Description Hybrid Work Environment: The successful candidate is expected to work onsite at 222 Jarvis St 3 days per week, and may work remotely up to 2 days per week. Responsibilities Required to translat ...

RQ08625 Software Developer Senior

About the job RQ08625 - Software Developer - Senior Description Review and understand code and architecture of the existing code, and make updates as required to ensure the code is modular and can support scalability requirements Code enhancements to existing featu ...

RQ08295 Automation Developer Senior

About the job RQ08295 - Automation Developer - Senior Description of Responsibilities: Identifies opportunities for automation within software processes Designs and executes QA tests using scripts that automatically test functionality. Designs and writes ...

Senior Full Stack Developer

Location Montreal Employment Type Full time Department Headquarters Product and Technology Small Door is membership‑based veterinary care designed with human standards that is better for pets, pet parents, and veterinarians alike. We designed and delive ...

Full Stack Developer Senior

Senior Full Stack Developer (Remote, with occasional travel to Edmonton) Project Overview The Developer(s) are responsible for applying security best practices, ensuring solutions meet regulatory and compliance standards, leading code reviews, collaborating with DevOps teams to in ...

Senior Developer, Platform Engineering

Select how often (in days) to receive an alert: Requisition ID: Join a purpose driven winning team, committed to results, in an inclusive and high-performing culture. The Senior Platform Engineer will play a critical role within the Enterprise Data & AI Technology organization - o ...

RQ08916 Software Developer Senior

About the job RQ08916 - Software Developer - Senior Description: Responsibilities Required to translate technical systems specifications into working, tested applications. This includes: developing detailed programming specifications writing and/or generating code compiling data-driven pr ...

RQ09084 Software Developer Senior

About the job RQ09084 - Software Developer - Senior Responsibilities Required to translate technical systems specifications into working, tested applications. This includes: developing detailed programming specifications writing and/or generating code compiling data-driven programs, mai ...

RQ08829 Software Developer Senior

About the job RQ08829 - Software Developer - Senior Responsibilities Required to translate technical systems specifications into working, tested applications. This includes: developing detailed programming specifications writing and/or generating code compiling data-driven programs, ...

RQ09474 Software Developer Senior

About the job RQ09474 - Software Developer - Senior Description Responsibilities Requirements analysis, in collaboration with the business analysts Solutions design and architecture artifacts - conceptual, logical and physical Architecture checkpoints a ...

RQ08287 Automation Developer Senior

About the job RQ08287 - Automation Developer - Senior Deliverables/Skill Set: Automation Test Developer, Senior Description of Responsibilities Identifies opportunities for automation within software processes Designs and executes QA tests using scripts that auto ...

RQ08497 Software Developer Senior

About the job RQ08497 - Software Developer - Senior Description NOTE Assignment Type: This position is currently listed as Hybrid and consultants will be required to work onsite at the work location 3 days a week and 2 days from home. The details of this ...

RQ08846 Software Developer Senior

About the job RQ08846 - Software Developer - Senior Description NOTE Assignment Type: This position is currently listed as Hybrid and consultants will be required to work onsite at the work location 3 days a week and 2 days from home. The details of this ...

Full Stack Developer – Senior

Overview Our government client is looking to contract a Full Stack Developer to join their Digital Design and Delivery Division (3D), formerly the Digital Innovation Office (DIO). The client requires a number of Full Stack Developers to work with 3D on service innovation, program review and digit ...

Full Stack Developer – Senior

Overview Our government client is looking to contract a Full Stack Developer to join their Digital Design and Delivery Division (3D), formerly the Digital Innovation Office (DIO). The client requires a number of Full Stack Developers to work with 3D on service innovation, program review and digit ...

Senior Cloud Native Developer

We are seeking a highly experienced and motivated Senior Cloud Native Developer to join our dynamic team of senior engineers. The ideal candidate will have over 10 years of industry experience and a deep understanding of cloud-native development, microservices architecture, and modern software engineering ...

RQ09108 Software Developer Senior

About the job RQ09108 - Software Developer - Senior Responsibilities: Required to translate technical systems specifications into working, tested applications. This includes developing detailed programming specifications, writing and/or generating code, compiling data-driven programs, maintaining ...

RQ08563 Software Developer Senior

About the job RQ08563 - Software Developer - Senior Responsibilities: Required to translate technical systems specifications into working, tested applications. This includes analysis, design and developing detailed programming specifications, writing and/or generating code, compil ...

RQ09176 Software Developer Senior

About the job RQ09176 - Software Developer - Senior Responsibilities: Required to translate technical systems specifications into working, tested applications. This includes developing detailed programming specifications, writing and/or generating code, compiling data-driven programs, maintaining, ...

RQ09059 Software Developer Senior

About the job RQ09059 - Software Developer - Senior Description: Responsibilities Required to translate technical systems specifications into working, tested applications. This includes: developing detailed programming specifications writing and/or generating code compiling data-driven pr ...

RQ08803 Software Developer Senior

About the job RQ08803 - Software Developer - Senior Description Responsibilities: Required to translate technical systems specifications into working, tested applications. This includes analysis, design and developing detailed programming specifications, writing and/or genera ...

RQ08340 Software Developer Senior

About the job RQ08340 - Software Developer - Senior Deliverables for Sr. Software Developer Design the process automation including reporting, monitoring, and dashboard in the Power Automate platform and compile a Solution Design Document (SDD). Document the development ...

Senior Gameplay Systems Developer

Drive the future of gaming as a Senior Gameplay Systems Developer at a top games studio. Focus on designing compelling systems in Unreal Engine while enhancing cross-platform experiences.This mid-senior role requires a collaborative mindset to work with designers and artists to bring gameplay mechanics to li ...

Senior Full Stack Developer

Job Description We are seeking a Senior Full Stack Developer to join the ClientLink Development team supporting a large-scale wealth management application. The successful candidate will play a key role in the development, enhancement, modernization, and support of enterprise‑grade applic ...

Senior iOS App Developer

About the Company:Since our founding in 1935, ourCompany has been committed to serving local and global communities by being a market leader in Investment Banking, Securities, Investment Management and Wealth Management services. Our belief that capital can work to benefit all of society inspires us to ...

Senior iOS Software Developer

About the role We are looking for a Senior Software Developer for our growing team! What you will accomplish with us: Perform systems and programming needs analyzes to identify problems encountered and provide proposed solutions including program specifications. ...

Full Stack Developer – Senior

Overview Our government client is looking to contract a Full Stack Developer to join their Digital Design and Delivery Division (3D), formerly the Digital Innovation Office (DIO). The client requires a number of Full Stack Developers to work with 3D on service innovation, program review and digit ...

Software Developer CRM Senior

<p>Job Title: Sr. Software Developer - CRM</p> <p>Location: Toronto, Ontario</p> <p>Work Model: Onsite</p> <p>Duration: 7 months</p> <p>Must Haves</p> < ...

Senior Blockchain Developer Operate

Job Type: Temporary Contract Work Model: Hybrid Reference code: 134690 Primary Location: Toronto, ON All Available Locations: Toronto, ON Our Purpos ...

Senior Full Stack.NET Developer

We are looking for a hands-on Senior Full Stack .NET Developer who enjoys building modern web applications, APIs, automation solutions, and integrations. The successful candidate will work closely with senior engineers, product owners, and business stakeholders to design and deliver scalable, secure, and maintai ...

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    Senior Developer Java Python Jobs in Canada Job Search Guide, Trends and Insights