Sr. Full stack Developer (Javascript, Python, REST API, SQL) to support integration work for a software development company
S.i. Systems
Toronto, ON-
Number of positions available : 1
- Salary To be discussed
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Contract job
- Published on September 3rd, 2025
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Starting date : 1 position to fill as soon as possible
Description
Our client is looking for a Sr. Full stack Developer (Javascript, Python, REST API, SQL) to support integration work for a software development company.
Must Have's:
- 5+ years as a full stack developer
- Good “interactive comms” (speaking live with others) is extremely important for this role
- Strong proficiency with React and modern JavaScript/TypeScript
- Advanced skills with Python
- Experience with REST API
- Proficient in SQL, PostgreSQL, including schema design and query optimization
Preferences:
- Experience with frameworks such as Django, flask, fastapi
- GraphQL API design and integration
- Understanding of data pipelines, ETL processes, and tools like Databricks
- Experience with geospatial data and functions (e.g., Geocoding API, H3 grid system, PostGIS)
- Experience with Docker and orchestration tools like Kubernetes
Nice To Have's:
- Strong debugging and problem-solving skills
- Experience with unit testing, test-driven development, and using frameworks such as pytest, unittest, or Jest
- Familiarity with cloud-based platform services such as Azure or AWS
- Familiarity with any version control system, e.g. Git, SVN, Mercurial, …
- Familiarity with build pipelines, e.g., GitActions, GitLab, BitBucket, Azure DevOps, …
- Familiarity with any software ticketing system or process, e.g., Jira, Solar, ServiceNow, etc.
- Familiarity with Version control in git-based system (GitHub, GitLab, BitBucket)
- Willingness to spend a significant portion of the onboarding and perhaps ongoing time in a collaborative team programming settings
Responsibilities:
- Design, develop, and maintain full stack web applications using Python, Django, React and Next.js
- Build and integrate RESTful and GraphQL APIs
- Implement scalable ETL/data transformation workflows using Databricks or similar platforms
- Write efficient and well-structured SQL, and manage PostgreSQL database schemas
- Develop and execute unit tests, and participate in writing integration and end-to-end tests
- Troubleshoot, debug, and resolve complex issues across the stack
- Ensure code quality through automated testing and code reviews
- Collaborate with cross-functional teams to implement features and business logic
- Communicate effectively with both technical and non-technical team members
- Provide guidance to junior developers
Requirements
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