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Fastapi Developer Jobs in Ontario (NOW HIRING)

WSP

AI Developer (LLM & Agentic Systems)

Toronto, ON · On-site

CA$104K - CA$138K/yr

As an AI Developer (LLM & Agentic Systems), you will design and develop AI-enabled applications and ... Proven ability to design and build scalable backend systems and APIs (Python - FastAPI preferred ...

WSP

AI Developer (LLM & Agentic Systems)

Toronto, ON

CA$104K - CA$138K/yr

As an AI Developer (LLM & Agentic Systems), you will design and develop AI-enabled applications and ... Proven ability to design and build scalable backend systems and APIs (Python - FastAPI preferred ...

Td

Full Stack Developer - TD Asset Management

Toronto, ON · On-site

CA$105K - CA$145K/yr

Work closely with data scientists and software engineers on the Business Innovation team to enable ... Python, Node.js, FastAPI, Flask, etc) * Participate in code reviews, testing cycles ...

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Fastapi Developer information

What are some common challenges FastAPI developers face when integrating third-party services or APIs?

FastAPI Developers often encounter challenges when integrating third-party services, such as handling authentication protocols (like OAuth2), ensuring compatibility between JSON schemas, and managing asynchronous calls to avoid performance bottlenecks. It’s also common to troubleshoot and adapt to inconsistencies in external API documentation or rate limits. Collaborating closely with frontend teams and DevOps professionals helps streamline these integrations, ensuring robust, scalable API solutions.

What is the difference between Fastapi Developer vs Backend Developer?

AspectFastapi DeveloperBackend Developer
Required SkillsPython, Fastapi, REST APIs, async programmingMultiple languages (Python, Java, Node.js), REST/SOAP APIs, databases
Work EnvironmentWeb development, API-focused projects, microservicesBroader software development, server-side logic, database management
Industry UsageTech startups, SaaS, API-driven servicesEnterprise, e-commerce, finance, various industries

Fastapi Developers specialize in building high-performance APIs using Python and Fastapi, often within microservices architectures. Backend Developers have a broader scope, working with multiple languages and technologies to develop server-side applications across various industries. While Fastapi Developers focus on API efficiency, Backend Developers handle comprehensive backend systems.

What are the key skills and qualifications needed to thrive as a FastAPI developer?

To thrive as a FastAPI Developer, you need strong proficiency in Python programming, RESTful API design, and experience with FastAPI, often supported by a background in computer science or related fields. Familiarity with tools like SQL/NoSQL databases, Docker, and cloud platforms, as well as knowledge of asynchronous programming and API documentation tools like Swagger, is typically required. Excellent problem-solving skills, attention to detail, and effective communication set outstanding FastAPI developers apart. These skills are crucial for building reliable, high-performance APIs that meet modern application demands and facilitate seamless team collaboration.

What is a FastAPI developer?

A FastAPI Developer is a software engineer who specializes in building web applications and APIs using the FastAPI framework, which is a modern, fast (high-performance) web framework for Python. FastAPI Developers are responsible for designing, developing, and maintaining backend services and APIs that are efficient, robust, and scalable. They often work with databases, authentication, and deployment processes, and ensure that the API endpoints adhere to best practices for security and performance. Their work is crucial for enabling smooth communication between front-end applications and backend systems.

What are popular job titles related to Fastapi Developer jobs in Ontario?

For Fastapi Developer jobs in Ontario, the most frequently searched job titles are:

What job categories do people searching Fastapi Developer jobs in Ontario look for?

The top searched job categories for Fastapi Developer jobs in Ontario are:

Fastapi Developer jobs near you
Infographic showing various Fastapi Developer job openings in Ontario as of August 2026, with employment types broken down into 72% Full Time, 14% Part Time, and 14% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution.

AI Developer (LLM & Agentic Systems)

WSP

Toronto, ON • On-site

CA$104K - CA$138K/yr

Full-time

Posted 22 days ago

WSP rating

8.6

Company rating: 8.6 out of 10

Based on 69 frontline employees who took The Breakroom Quiz

17th of 72 rated business consultants

Job description

What if you could redefine what's possible?
With us, you can. You want Purpose. Growth. Opportunity. People who get it.
We are the home of ambitious, passionate, and innovative world shapers.
With an unmatched breadth and depth of engineering, advisory and sciencebased expertise, our global minds unite to power local solutions.
We are pathfinders and impact makers.
We are Visioneers.
We are WSP.
#GlobalMining
The Opportunity
Build the future with us.
As an AI Developer (LLM & Agentic Systems), you will design and develop AI-enabled applications and intelligent systems used in client-facing projects, supporting decision-making across mining, resources, infrastructure, and environmental domains. You will build next-generation AI applications that combine Large Language Models (LLMs), structured data, and domain knowledge to enable advanced reasoning and support complex engineering and operational decisions. This role can be based anywhere in Canada and plays a key part in advancing our AIenabled platforms, internal tooling, and nextgeneration data solutions.
 
#GlobalMining #ERI_Opportunities #carrieres_ERI 
Your Impact
  • Design, build, and maintain scalable fullstack applications that integrate advanced AI and data capabilities.
  • Develop backend APIs and cloudnative components that support scalable data and analytics workflows. 
  • Integrate LLMs, agentic workflows, and NLP techniques (e.g., entity recognition and entity resolution) into production-ready systems.
  • Contribute to the design and evolution of knowledgebased and datadriven platforms.
  • Develop and integrate data pipelines and knowledge-driven components (e.g., structured data, semantic layers, or knowledge graphs) into applications.
  • Collaborate closely with analytics, data science, knowledge engineering, and digital product teams.
  • Work directly with internal teams and clients to translate requirements into scalable, production-ready solutions.
  • Implement secure, maintainable, and testable code aligned with industry best practices.
  • Support CI/CD, Git workflows, and DevOps automation.
The Skills That Set You Apart
  • Bachelor's or Master's degree in Computer Science, Software Engineering, or a related discipline.
  • 5+ years of professional software development experience, including 2+ years leading the design, deployment, and scaling of LLM-based or agentic AI systems in production environments.
  • Demonstrated experience designing end-to-end AI architectures, including data ingestion, retrieval, reasoning layers, and user-facing applications.
  • Strong experience with LLM workflows, including prompt engineering, evaluation strategies, agent orchestration, and tool integration.
  • Hands-on experience with embeddings, vector search, and RAG pipelines, including performance optimization and retrieval quality improvements.
  • Proven ability to design and build scalable backend systems and APIs (Python - FastAPI preferred, or Node.js), including microservices architectures.
  • Experience integrating structured and unstructured data into scalable AI applications.
  • Experience applying NLP techniques (e.g., entity extraction, entity resolution) in real-world applications.
  • Strong experience with cloud-native development (Azure preferred), including deployment, monitoring, and cost/performance optimization.
  • Experience with DevOps practices, including CI/CD pipelines, Git workflows, and multi-environment deployments (dev, UAT, production).
  • Nice to have: Experience with knowledge graphs and graph query languages (e.g., SPARQL, Cypher), microservices, Docker/Kubernetes, ETL pipelines, or engineeringheavy data environments.
Why Choose WSP?
We exist to shape communities to advance humanity. The brightest engineers, advisors and scientists from across the globe call WSP home.
Proudly Canadian - we are a Top 100 Employer in Canada for 2026.
A global community of brilliant minds - your next idea, mentor, or opportunity is always within reach.
Limitless opportunities start here. Whether it's across the country or around the globe, we help you tailor your role to match your ambition - because your growth drives ours.
Flexible work, real balance - we recognize the importance of balance in our lives and encourage you to prioritize the balance in yours.
#WeAreWSP
Compensation
AB, BC, NT, NU, SK & YT: $104,100 - $138,000
MB & ON: $95,5000 - $130,800
NB, NL, NS, PEI & QC: $94,100 - $124,900
 
Disclosure:
The final salary awarded for this role may vary from the above range based on several factors including, but not limited to, relevant education, qualifications, certifications, experience, skills, seniority, geographic location, performance, and business or organizational needs. The wage range provided in this job posting may be subject to change for business purposes.
Make Your Mark with WSP
If you're ready to shape the future of AIenabled platforms and build digital tools that make a real impact, we'd love to hear from you. Apply today and help redefine what's possible.
At WSP, we exist to shape communities to advance humanity.
It's why we bring people together who are wired to solve complex challenges - engineers, scientists, advisors, and technical experts who are driven by a common passion - to redefine what's possible and shape what comes next. We are Visioneers.
As one of the world's leading professional services firms, we partner with clients across transportation, infrastructure, environment, buildings, energy, water, mining and metals. We pair deep local knowledge with global insights to pioneer solutions designed to leave a lasting, positive impact.
At WSP, you'll join a community of brilliant minds that push boundaries every day - applying deep expertise and fuelling innovation to help create a more connected and resilient future. Here, your ideas are valued, your growth is supported, and you are encouraged to bring your authentic self to work. We empower our people to collaborate across disciplines, challenge the status quo, and shape a career with purpose.
Join us.
Please Note:
Health and Safety is a core paramount value of WSP. Given the importance of keeping one another safe it is expected that you comply with our Health, Safety & Environment (HSE) policy at all times as well as client HSE policies when working at client locations. Full details here.
Some safety-sensitive positions involve fieldwork and may include work in a variety of environmental conditions, such as remote or isolated areas, working alone, and in inclement weather (within safe and reasonable limits).
WSP welcomes and encourages applications from people with disabilities. Accommodations are available on request for candidates taking part in all aspects of the selection process.
WSP is committed to the principles of employment equity. Only the candidates selected will be contacted.
WSP does not accept unsolicited resumes from agencies. Full details here.

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