Senior Fullstack Developer

Avanciers Incorporated is hiring a Senior Fullstack Developer for one of our clients.

Job Title: Senior Fullstack Developer

Job Location: Toronto, ON - Onsite

Employment Type: Contract

Duration: 12+ Months

This is an active job and application deadline is March 10, 2026

(This posting may close earlier if a suitable candidate is found)

Job description:

• Full-Stack Development Expertise: Strong experience building scalable applications using React.js (functional components, hooks, Context API), Next.js (SSR, routing), TypeScript, HTML5, JavaScript, CSS3/SCSS, and responsive design, with solid knowledge of UI design patterns, testable UI architecture, and Axios for API integration and error handling.
• Backend & API Development: Proficient in Python (FastAPI) for REST API development, with hands-on experience in Node.js, Java Spring Boot, and .NET Core Web APIs using C#, including integration with custom portals and diverse backend technologies.
• Cloud, DevOps & Containerization: Extensive experience with Azure cloud services, including Azure SQL Server (tuning, encryption, stored procedures), Cosmos DB, Azure Key Vault, and Azure DevOps CI/CD pipelines, along with strong expertise in Docker, Kubernetes, YAML configuration, and Azure Kubernetes Service (AKS) deployments.
• Security, Architecture & Troubleshooting: Solid understanding of software architecture patterns, microservices, and secure application design, including OAuth2.0, JWT authentication, and web security, with proven ability to troubleshoot and resolve issues across development, implementation, deployment, and production environments.

Artificial Intelligence (AI) Disclosure

• We use AI-enabled tools to assist in screening applications based on job-related criteria.

Our Commitment to Diversity and Inclusion

Avanciers Incorporated is an equal opportunity employer committed to creating an inclusive and accessible workplace. We welcome applications from all qualified individuals regardless of race, color, religion, sex, sexual orientation, gender identity, national origin, disability, age, or any other protected characteristic. We are committed to providing accessible employment practices that comply with the Accessibility for Ontarians with Disabilities Act (AODA).

Important Information for Applicants

• Only candidates selected for an interview will be contacted
• Proof of qualifications may be requested
• Background checks may be conducted as part of the hiring process
• Avanciers Incorporated does not use Canadian Social Insurance Numbers (SIN) during the application process

Avanciers Incorporated thanks all applicants for their interest; however, only those selected for an interview will be contacted.

Avanciers Incorporated

www.avanciers.com