Senior Full Stack Application Developer to support our aviation industry client

S I Systems; Toronto; On-site; CAD 110,000 - 140,000; Full time

Job summary

S I Systems seeks a Senior Full Stack Application Developer to support our aviation industry client in Toronto, ON. You will combine strong frontend skills with hands-on backend work, AWS cloud, and serverless development experience to build end-to-end solutions.

The ideal candidate will work independently, own features across the lifecycle, and leverage AI-assisted tools like Cursor or Claude Code to speed development. This role is onsite in Toronto with a 12-month contract.

Qualifications

• Must have hands-on experience as a Full Stack Developer/Application Developer in enterprise environments.
• Hands-on backend development with REST APIs and services.
• Strong AWS cloud technologies experience.
• Serverless applications in AWS.
• Experience with AI-enabled development tools like Cursor and Claude Code.
• CI/CD pipelines and modern DevOps practices.
• Git/GitHub or equivalent version control.
• Solid understanding of the SDLC and production support.

Responsibilities

• Design, develop, test, deploy, and support full stack applications and features.
• Take end-to-end ownership of features from requirements to production deployment.
• Build and integrate backend services, APIs, and components.
• Leverage AWS cloud and serverless technologies.
• Utilize AI-assisted development tools to improve quality and speed.
• Maintain DevOps and CI/CD pipelines for automated builds and deployments.
• Produce secure, scalable, production-ready code.
• Troubleshoot across stack and environments.
• Collaborate with cross-functional teams and participate in code reviews.

Skills

Full Stack Dev

Frontend development

REST APIs

AWS Cloud

Serverless

AI tools Cursor/Claude Code

CI/CD pipelines

Git/GitHub

SDLC

Independent ownership

Problem solving

Job description

Senior Full Stack Application Developer to support our aviation industry client

We are seeking a Senior Full Stack Application Developer to support our aviation industry client. The successful candidate will bring strong full stack development capabilities, with particular depth in modern frontend development combined with hands‑on backend, AWS cloud, and serverless development experience.

This role requires a highly independent developer who can take ownership of an assigned feature or task and deliver it end‑to‑end across the full software development and deployment lifecycle, with minimal supervision.

The ideal candidate will also have experience with AI‑enabled software development, including hands‑on use of tools such as Cursor or Claude Code, as well as strong DevOps and CI/CD capabilities.

Contract Duration: 12 months

Start Date: October 2026

3 open postions

Key Responsibilities

• Design, develop, test, deploy, and support full stack applications and features.
• Take end‑to‑end ownership of assigned features and technical deliverables from requirements through production deployment.
• Build and integrate backend services, APIs, and application components.
• Design and develop solutions leveraging AWS cloud and serverless technologies.
• Use AI‑assisted development tools such as Cursor or Claude Code to accelerate development, testing, debugging, documentation, and code quality.
• Build, configure, and maintain DevOps and CI/CD pipelines supporting automated build, test, deployment, and release processes.
• Develop secure, maintainable, scalable, and production‑ready code.
• Troubleshoot application, integration, cloud, and deployment issues across the technology stack.
• Collaborate with product, UX/UI, architecture, engineering, and other technical teams while independently driving assigned deliverables.
• Participate in code reviews and contribute to development standards, architecture decisions, and engineering best practices.
• Support applications throughout the complete development and deployment lifecycle.

Must‑Have Qualifications

• Strong hands‑on experience as a Full Stack Developer/Application Developer in enterprise environments.
• Hands‑on backend development experience, including building and integrating REST APIs and services.
• Strong hands‑on experience with AWS cloud technologies.
• Experience developing and deploying serverless applications and services within AWS.
• Hands‑on experience with AI‑enabled development tools, specifically Cursor and/or Claude Code.
• Strong experience creating and maintaining CI/CD pipelines and working within modern DevOps environments.
• Experience with source‑control and collaborative development practices using Git/GitHub or equivalent technologies.
• Strong understanding of the full software development lifecycle (SDLC), including development, testing, deployment, monitoring, troubleshooting, and production support.
• Demonstrated ability to work with little or no supervision and independently take ownership of features and technical deliverables.
• Strong problem‑solving, troubleshooting, communication, and collaboration skills.

Ideal Candidate

The ideal candidate is a hands‑on senior developer who is equally comfortable working across frontend, backend, cloud, and deployment environments. You should be able to receive a feature or technical requirement, determine the appropriate solution, build and test it, establish or enhance the deployment pipeline where required, and successfully take the solution through to production.

Experience working in a fast‑paced, product‑oriented or rapid application development environment is highly desirable.

Role Overview

We are seeking a Senior Full Stack Application Developer to support our aviation industry client. The successful candidate will bring strong full stack development capabilities, with particular depth in modern frontend development combined with hands‑on backend, AWS cloud, and serverless development experience.

This role requires a highly independent developer who can take ownership of an assigned feature or task and deliver it end‑to‑end across the full software development and deployment lifecycle, with minimal supervision.

The ideal candidate will also have experience with AI‑enabled software development, including hands‑on use of tools such as Cursor or Claude Code, as well as strong DevOps and CI/CD capabilities.

Location: Toronto, ON – Onsite 4 days per week

Contract Duration: 12 months

Start Date: October 2026

3 open postions

Key Responsibilities

• Design, develop, test, deploy, and support full stack applications and features.
• Take end‑to‑end ownership of assigned features and technical deliverables from requirements through production deployment.
• Develop modern, responsive, scalable frontend applications using current JavaScript/TypeScript frameworks and technologies.
• Build and integrate backend services, APIs, and application components.
• Design and develop solutions leveraging AWS cloud and serverless technologies.
• Use AI‑assisted development tools such as Cursor or Claude Code to accelerate development, testing, debugging, documentation, and code quality.
• Build, configure, and maintain DevOps and CI/CD pipelines supporting automated build, test, deployment, and release processes.
• Develop secure, maintainable, scalable, and production‑ready code.
• Troubleshoot application, integration, cloud, and deployment issues across the technology stack.
• Collaborate with product, UX/UI, architecture, engineering, and other technical teams while independently driving assigned deliverables.
• Participate in code reviews and contribute to development standards, architecture decisions, and engineering best practices.
• Support applications throughout the complete development and deployment lifecycle.

Must‑Have Qualifications

• Strong hands‑on experience as a Full Stack Developer/Application Developer in enterprise environments.
• Strong frontend development expertise using modern JavaScript/TypeScript technologies and frameworks.
• Hands‑on backend development experience, including building and integrating REST APIs and services.
• Strong hands‑on experience with AWS cloud technologies.
Experience developing and deploying serverless applications and services within AWS.
• Hands‑on experience with AI‑enabled development tools, specifically Cursor and/or Claude Code.
• Strong experience creating and maintaining CI/CD pipelines and working within modern DevOps environments.
• Experience with source‑control and collaborative development practices using Git/GitHub or equivalent technologies.
• Strong understanding of the full software development lifecycle (SDLC), including development, testing, deployment, monitoring, troubleshooting, and production support.
• Demonstrated ability to work with little or no supervision and independently take ownership of features and technical deliverables.
• Strong problem‑solving, troubleshooting, communication, and collaboration skills.

Ideal Candidate

The ideal candidate is a hands‑on senior developer who is equally comfortable working across frontend, backend, cloud, and deployment environments. You should be able to receive a feature or technical requirement, determine the appropriate solution, build and test it, establish or enhance the deployment pipeline where required, and successfully take the solution through to production.

Experience working in a fast‑paced, product‑oriented or rapid application development environment is highly desirable.

Disclaimer: AI may be used in evaluating candidates.

This posting is for an existing vacancy.