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Sr Backend Python Developer Jobs in Toronto, ON (NOW HIRING)

Turing

Remote Backend Engineer (Python/FastAPI)

Toronto, ON · Remote

CA$200 - CA$300/hr

... engineering experience (3 years or more). * Strong expertise in building full-stack applications using Python and JavaScript (React, Node.js), with the ability to work across backend and frontend ...

Chubb

Senior Backend Engineer

Toronto, ON · On-site

... a Python FastAPI RAG orchestration service integrating Azure AI Search and Azure OpenAI; and a ... The Senior Backend Engineer, AI Platform owns the backend surface. You are the primary engineer on ...

ShyftLabs

Senior Backend Developer

Toronto, ON · Hybrid

CA$100K - CA$140K/yr

The Opportunity ShyftLabs is looking for a Senior Developer to help design, build, and scale our ... Drive development across teams for services built in Node.js, TypeScript, JavaScript, and Python

Tucows Domains

Senior Backend Engineer

Toronto, ON · Remote

CA$145K - CA$155K/yr

As a Senior Backend Software Engineer, you will design, build, and maintain the services, databases ... Strong experience with Python, Go, or similar backend languages. * Experience designing RESTful ...

Tucows Inc.

Senior Backend Engineer

Toronto, ON · Remote

CA$145K - CA$155K/yr

As a Senior Backend Software Engineer, you will design, build, and maintain the services, databases ... Strong experience with Python, Go, or similar backend languages. * Experience designing RESTful ...

Jay Analytix

Python Developer

Toronto, ON

Proficiency in Python and Flask framework. * Strong understanding of React.js and its core ... Troubleshoot and debug front-end issues. Back-end Development (Flask): * Design and implement web ...

Jay Analytix

Python Developer

Toronto, ON · On-site

Proficiency in Python and Flask framework. * Strong understanding of React.js and its core ... Troubleshoot and debug front-end issues. Back-end Development (Flask): * Design and implement web ...

Worthland

Senior Backend Engineer (Web3)

Toronto, ON · On-site

CA$300K - CA$450K/yr

Role Overview We are seeking a Senior Backend Engineer (Web3) with strong expertise in Go and ... Collaborative, developer-focused work environment in a downtown office . * Inclusive and dynamic ...

Worthland

Senior Backend Engineer (Web3)

Toronto, ON · On-site

CA$300K - CA$450K/yr

Role Overview We are seeking a Senior Backend Engineer (Web3) with strong expertise in Go and ... Collaborative, developer-focused work environment in a downtown office . * Inclusive and dynamic ...

Turing

Remote Python Developer

Toronto, ON · Remote

CA$200 - CA$300/hr

This role is ideal for engineers who have built production systems at companies like Google ... Python across backend services, data pipelines, and ML infrastructure, alongside JavaScript ...

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Sr Backend Python Developer information

What is the difference between Sr Backend Python Developer vs Backend Python Developer?

AspectSr Backend Python DeveloperBackend Python Developer
Required Experience5+ years, leadership skills1-3 years, technical skills
ResponsibilitiesDesigning architecture, mentoringImplementing features, coding
CertificationsOptional, often relevantOptional
Work EnvironmentTeam leadership, project planningDevelopment, coding tasks

The main difference between a Sr Backend Python Developer and a Backend Python Developer lies in experience, responsibilities, and leadership roles. Senior developers typically have more experience, oversee architecture, and mentor junior staff, while backend developers focus on coding and feature implementation. Both roles are essential in Python-based backend development within tech companies and share similar technical requirements.

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Sr Backend Python Developer jobs near you

Remote Backend Engineer (Python/FastAPI)

Toronto, ON • Remote

Turing
IT Services • 51 - 200 employees
Learn more about Turingexternal

CA$200 - CA$300/hr

Contractor

Medical, PTO

Posted 6 days ago

Job description

About Us:
Based in San Francisco, California, Turing is the world’s leading research accelerator for frontier AI labs and a trusted partner for global enterprises deploying advanced AI systems. Turing supports customers in two ways: first, by accelerating frontier research with high-quality data, advanced training pipelines, plus top AI researchers who specialize in software engineering, logical reasoning, STEM, multilinguality, multimodality, and agents; and second, by applying that expertise to help enterprises transform AI from proof of concept into proprietary intelligence with systems that perform reliably, deliver measurable impact, and drive lasting results on the P&L.

Ideal Background:
This role is ideal for engineers who have built production systems at companies like Google, Microsoft, Apple, Amazon, Meta, or similar high-scale engineering organizations. We especially welcome graduates from leading programs such as Harvard, Columbia, Princeton, Yale, University of Pennsylvania, and comparable institutions — though exceptional experience and skill always take precedence over pedigree.

Project Overview:
As a Software Engineering evaluator, you will create cutting-edge datasets for training, benchmarking, and advancing large language models, collaborating closely with researchers. This includes curating code examples, providing precise solutions, and making corrections across the full stack — in Python for backend and ML workflows, and JavaScript (React, Node.js) for frontend and API layers, alongside C/C++, Java, Rust, and Go. You will evaluate and refine AI-generated code for efficiency, scalability, and reliability, and work with cross-functional teams to enhance enterprise-level AI-driven coding solutions.

What Does a Typical Day Look Like?
  • Work on AI model training initiatives by curating code examples, building solutions, and correcting code across both Python and JavaScript (React, Node.js), with additional work in C/C++, Java, Rust, and Go.
  • Evaluate and refine AI-generated code across backend and frontend contexts to ensure that it is efficient, scalable, and reliable.
  • Collaborate with cross-functional teams to enhance AI-driven coding solutions against industry performance benchmarks.
  • Build agents that can verify the quality of the code and identify error patterns across full-stack applications.
  • Hypothesize on steps in the software engineering cycle (prototyping, architecture design, API design, production implementation, launch, experiments, monitoring, operational maintenance) and evaluate model capabilities on them.
  • Design verification mechanisms that can automatically verify a solution to a software engineering task.

Required Skills:
  • Several years of software engineering experience (3 years or more).
  • Strong expertise in building full-stack applications using Python and JavaScript (React, Node.js), with the ability to work across backend and frontend codebases.
  • Experience deploying scalable, production-grade software using modern languages and tools.
  • Deep understanding of software architecture, design, development, debugging, and code quality/review assessment.
  • Excellent oral and written communication skills for clear, structured evaluation rationales.

Engagement Details:
  • Commitment: flexible engagement, minimum 10 hrs/week, up to 40 hrs/week.
  • Type: Contractor (no medical/paid leave).
  • Duration: 1 month (potential extensions based on performance and fit).
  • Location: Candidates must be based in the United States.

Evaluation Process:
  • The application process takes 15–30 minutes.
  • Completion of an AI video interview is required.