Senior Python Developer Jobs in Ontario (NOW HIRING)

Adastra is seeking a Back-End Python Developer to help build, maintain, and enhance the back-end services that power a promotion planning and price optimization platform. As a core member of the software development team, you will contribute to scalable, high-performing systems by writing clean, efficient Python code and supporting the ongoing evolution of the platform. This role plays a key part in improving system performance, enabling new features, and supporting reliable, data-driven decision-making.

Primary Location: Toronto, ON

Work Model: Hybrid 3-Days Onsite

Employment Type: Contractor

RESPONSIBILITIES

• Develop, test, and maintain scalable back-end services and RESTful APIs under the guidance of senior team members
• Contribute to code and database optimizations to improve system performance and efficiency
• Collaborate with product managers and engineers to implement new features and resolve technical issues
• Support the reliability and maintainability of back-end systems in a production environment

QUALIFICATIONS, SKILLS & EXPERIENCE

• 3-5 years of experience developing production-level back-end systems
• Strong proficiency in Python and SQL
• Experience building and consuming RESTful APIs
• Solid understanding of clean code principles, automated testing, and Git-based workflows
• Experience working in Agile development environments
• Strong collaboration skills and ability to work effectively within cross-functional teams
• Good problem-solving skills with the ability to implement well-defined solutions and troubleshoot issues

NICE TO HAVE

Experience with cloud environments such as Google Cloud Platform

Familiarity with containerization technologies such as Docker and Kubernetes

Exposure to Domain-Driven Design and microservices architectures

A growth mindset with interest in learning new technologies and continuously improving technical skills

ABOUT ADASTRA

Adastra is a global leader in AI and data-driven transformation, helping organizations lead with artificial intelligence-responsibly, strategically, and at scale. With over 25 years of experience, Adastra empowers enterprise clients to unlock business value through data innovation, operational excellence, and smart customer engagement.

Trusted by some of the world's most prominent brands, Adastra delivers end-to-end solutions grounded in thoughtful strategy, robust governance, and deep technical expertise. From defining vision to ensuring execution, Adastra guides organizations through every stage of their AI, data and cloud journey-building future-ready capabilities and delivering measurable, lasting impact.

Adastra serves clients across key industries including financial services, automotive, manufacturing, technology, media and telecom (TMT), healthcare, retail, and professional services. The company employs more than 2,000 professionals across North America, Europe, and Asia.

WHAT WE OFFER

• Opportunity for advancement and career progression
• Successful referral program
• The opportunity to work with one of Canada's 50 Best Managed Companies
• Satisfaction of working for a reputable company 
• A flexible, dynamic, and diverse workplace

EQUAL OPPORTUNITY EMPLOYER

In our commitment to promote fair and equitable treatment of all employees and applicants, Adastra Corporation provides equal employment opportunities for all individuals regardless of age, sex, disability, race, ethnic origin, citizenship, creed, sexual orientation, marital status, or any other ground as described in the Ontario Human Rights Code.  In addition, accommodation will be provided during the hiring process. Adastra Corporation's implementation and support of employment initiatives, encourage diversified labour force participation and equal access to opportunities based on merit and performance.

AI Usage - Our hiring process includes the use of AI-enabled tools to screen applications (e.g., keyword matching, qualification ranking). A human recruiter reviews all AI-generated shortlists to make informed hiring decisions.

There has been an increased instance of fraudulent job offers coming from people posing as Adastra HR employees. Please note that Adastra will never request fees as part of our recruiting process and any emails sent to you that are not from '@adastragrp.com' or '@talent.icims.com' are fraudulent. All employment offers are sent via DocuSign and if you receive an employment offer from a suspicious email and not via DocuSign, it is fraudulent.

Contact careers@adastragrp.com to inquire about jobs at Adastra, to report a suspicious request for money or personal information from external websites or suspicious employment offers.