Senior Software Developer - Full Stack

Client:   Government Services Integration Cluster

Ministry:   Ministry of Public and Business Service Delivery and Procurement

Location:   Toronto, Ontario

Work Arrangement:   Onsite – 5 Days per Week

Contract Start:   September 21, 2026

Contract End:   October 1, 2027

Extension:   Up to 1 Extension Term

Security Clearance:   No Clearance Required

Position Type:   Contract

Number of Openings:  1

Position Overview

We are seeking a highly experienced   Senior Full Stack Software Developer   to design, develop, implement, and support large-scale, multi-client web and mobile applications. The successful candidate will possess strong hands-on expertise across full-stack development, mobile application development, Java, React, React Native, REST APIs, databases, cloud technologies, DevOps, and modern software architecture.

This role requires a technically strong professional capable of working throughout the complete Software Development Life Cycle (SDLC), collaborating with business and technical stakeholders, and delivering scalable, secure, maintainable, and high-performing applications.

Key Responsibilities

• Design, implement, and continuously enhance data pipelines, including extraction, transformation, and loading activities.
  
• Translate technical system specifications into fully functional, tested applications.
  
• Develop detailed programming specifications and write, generate, compile, test, debug, and maintain application code.
  
• Conduct unit testing and support application deployment and troubleshooting.
  
• Resolve technical issues arising during the use and operation of software applications.
  
• Provide technical assistance during implementation, conversion, migration, and post-implementation activities.
  
• Collaborate with IT professionals and stakeholders throughout the Software Development Life Cycle.
  
• Design, develop, test, debug, document, deploy, and maintain full-stack applications.
  
• Develop and integrate front-end interfaces, back-end services, APIs, databases, and mobile applications.
  
• Build scalable and high-performance web and mobile solutions.
  
• Participate in design walkthroughs and collaborate closely with functional and technical teams.
  
• Develop user and system documentation as required.
  
• Provide post-implementation support and resolve technical issues.
  

Requirements

Mandatory Core Skills & Experience

Full Stack Development

The ideal candidate must demonstrate strong experience in:

• 10+ years of experience   as a designer and developer of large-scale, multi-client web applications.
  
• 10+ years of hands-on Java development experience .
  
• Experience working with   Azure SQL Database, Dataverse, and Oracle databases .
  
• 5+ years of hands-on experience with:
  
• REST APIs
  
• React
  
• TypeScript
  
• HTML5
  
• CSS3
  
• Node.js
  
• Strong experience with front-end and back-end application development and integration.
  
• Experience designing and implementing overall web architecture.
  
• Experience implementing approved user interfaces and database deployments.
  
• Experience designing applications for speed, scalability, extensibility, and maintainability.
  
• Experience developing and integrating REST API services.
  
• Experience integrating front-end UI components with APIs.
  
• Experience developing responsive web applications.
  
• Strong understanding of application architecture and modern design patterns.
  

Mandatory Mobile Application Development Skills

Candidates   must have strong hands-on experience in mobile application development , including:

• Experience with the   React Native framework for cross-platform mobile application development .
  
• Hands-on experience developing mobile applications for   both iOS and Android .
  
• Knowledge of:
  
• Android SDK
  
• iOS SDK
  
• Platform-specific APIs
  
• Familiarity with native modules and bridging between React Native and native code.
  
• Knowledge or experience with native development technologies, including:
  
• Objective-C
  
• Swift
  
• Java
  
• Kotlin
  
• Extensive experience with:
  
• JavaScript
  
• CSS
  
• HTML
  
• Front-end development languages
  
• User interface design
  

Front-End Development Skills

Strong hands-on experience with modern front-end technologies, including:

• React
  
• React Native
  
• Angular / AngularJS
  
• JavaScript
  
• TypeScript
  
• HTML5
  
• CSS3
  
• Node.js
  

The candidate should demonstrate the ability to:

• Create self-contained, reusable, and testable modules and components.
  
• Develop responsive and scalable front-end interfaces.
  
• Create, design, and implement layouts for new and existing web pages.
  
• Render both server-side and client-side content.
  
• Design effective user interactions and interfaces.
  
• Ensure front-end applications successfully query and integrate with APIs.
  
• Demonstrate fundamental knowledge of UX/UI principles.
  

Back-End & Java Development

Required experience includes:

• Strong Java programming experience for web applications.
  
• Experience with Java application servers and technologies, including:
  
• Tomcat
  
• WebLogic
  
• EJB
  
• Servlets
  
• Experience with REST and SOAP web services.
  
• Strong understanding of object-oriented programming principles.
  
• Experience with object-oriented coding practices.
  
• Knowledge of:
  
• Design patterns
  
• Refactoring
  
• Clean code principles
  

Database Skills

Strong database and SQL experience is required, including:

• Oracle
  
• SQL Server
  
• Azure SQL Database
  
• Dataverse
  
• Relational database technologies
  
• Database design and management
  
• SQL development and query languages
  

API & Integration Skills

Candidates must demonstrate:

• Strong knowledge and experience with RESTful APIs.
  
• Experience designing and constructing REST API services.
  
• Experience integrating front-end applications with APIs.
  
• Strong understanding of API documentation and Swagger files.
  
• Experience or knowledge of SOAP web services.
  
• Experience with application architecture and front-end/back-end integration.
  
• Experience with middleware and gateways.
  

Cloud, DevOps & CI/CD

Required experience includes:

• Experience using   Azure DevOps .
  
• Experience designing and implementing Continuous Integration and Continuous Deployment (CI/CD).
  
• Experience working with Agile/Scrum environments.
  
• Familiarity with JIRA.
  
• Experience with application deployment and troubleshooting.
  

Architecture & Technical Design

The successful candidate should possess:

• Knowledge and experience with microservices architecture.
  
• Demonstrated ability to apply core architecture principles to improve product extensibility and maintainability.
  
• Knowledge of major architectural styles, including:
  
• Message-oriented architecture
  
• Reactive architecture
  
• Event-based architecture
  
• Experience with application design and modern design patterns.
  
• Experience with structured methodologies for application development, implementation, and maintenance.
  

Security Requirements

Knowledge and experience with security gateways and protocols, including:

• JWT
  
• OAuth 2.0
  
• SSL Certificates
  

Accessibility Requirements

Candidates must have proven experience with:

• WCAG standards
  
• Accessibility for Ontarians with Disabilities Act (AODA)
  
• Related accessibility regulations and standards
  

Blockchain – Required Technical Knowledge

Candidates should possess knowledge and experience in:

• Blockchain development
  
• Smart contract development using Solidity
  
• Basic principles of cryptography
  

General Technical Competencies

The ideal candidate will also demonstrate:

• Experience in programming and systems analysis.
  
• Experience supporting specialized software packages.
  
• Experience eliciting and documenting information from diverse business stakeholders and subject matter experts.
  
• Experience with application design, deployment, maintenance, and troubleshooting.
  
• Experience with communications protocols.
  
• Experience developing Internet-ready applications.
  
• Knowledge of rapid application development (RAD) methodologies.
  
• Knowledge of Information Management principles, concepts, policies, and practices.
  
• Experience reviewing, analyzing, modifying, testing, and debugging product installation scripts.
  
• Ability to provide technical and post-implementation support.
  

Soft Skills

The successful candidate must possess:

• Excellent written and verbal communication skills.
  
• Strong interpersonal and relationship-building skills.
  
• Ability to develop and present innovative ideas and conceptualize new approaches and solutions.
  
• Strong analytical and systematic problem-solving abilities.
  
• Demonstrated ability to work effectively with functional and technical teams.
  
• Ability to work successfully within large, collaborative teams.
  
• Strong decision-making and negotiation skills.
  
• Ability to work under pressure and meet aggressive timelines.
  
• Adaptability and flexibility in changing environments.
  
• A strong track record of meeting project deadlines.
  
• Demonstrated ability to troubleshoot and resolve complex technical problems.
  

Public Sector Experience

• Experience with   OPS Development Standards and Processes   is required/preferred.
  

Nice to Have

• Experience with   Apple App Store deployment processes .
  
• Experience with   Google Play Store deployment processes .
  

Candidate Profile

We are looking for a highly experienced Full Stack Developer who combines deep expertise in   Java, React, React Native, mobile application development, APIs, databases, cloud technologies, DevOps, security, accessibility, and modern architecture .

This opportunity is particularly suited for candidates with proven experience delivering   large-scale enterprise applications , cross-platform   iOS and Android mobile applications , and scalable web solutions within complex enterprise or public-sector environments.

Critical Mandatory Screening Criteria

Candidates should clearly demonstrate the following on their resume:

• 10+ years in large-scale web application design and development.
  
• 10+ years of Java development experience.
  
• Azure SQL Database, Dataverse, and Oracle experience.
  
• 5+ years of REST API, React, TypeScript, HTML5, CSS3, and Node.js experience.
  
• Strong React Native experience.
  
• Hands-on iOS and Android mobile application development.
  
• Android SDK and iOS SDK knowledge.
  
• Experience with native modules and React Native bridging.
  
• Knowledge of Objective-C/Swift or Java/Kotlin.
  
• WCAG and AODA experience.
  
• Azure DevOps experience.
  
• Microservices architecture experience.
  
• JWT, OAuth 2.0, and SSL Certificates knowledge.
  
• Agile/Scrum experience.
  
• Strong SQL and database development experience.
  
• Blockchain and Solidity knowledge/experience.