Senior software developer Jobs in Etobicoke, ON

Job Description

Client: Government of Ontario – Central Agencies Cluster

Ministry: Ministry of Treasury Board Secretariat

Location: Toronto/Oshawa, Ontario

Work Arrangement: 100% Onsite – 5 days per week

Office Locations: 33 King West, Oshawa / 222 Jarvis Street, Toronto

Contract: September 8, 2026 – March 22, 2027

Extension: Up to 89 days, with a maximum of one extension

Hours: 7.25 hours per day, Monday to Friday, between 8:00 AM and 5:00 PM, excluding lunch

Openings: 1

Security: Enhanced

Closing Date: September 16, 2026 at 12:00 PM EST

Position Overview

The Government of Ontario is seeking a Senior Software Developer to provide end-to-end software development, application support, technical troubleshooting, and solution design expertise.

The successful candidate will translate technical and business requirements into secure, reliable, tested applications and will work closely with developers, architects, QA teams, project managers, business stakeholders, and subject matter experts throughout the Software Development Life Cycle (SDLC).

The role requires strong hands-on programming experience, ideally with Java, as well as experience with Microsoft Power Apps, Azure DevOps, Windows/Linux environments, Oracle 19c, DB2, middleware, REST APIs, application monitoring, performance tuning, and release/change management.

Key Responsibilities

• Translate technical systems specifications and business requirements into detailed programming specifications and working applications.
  
• Design, develop, code, compile, test, debug, document, deploy, and maintain applications.
  
• Provide end-to-end solution design, development, unit testing, and technical recommendations aligned with business outcomes, reference architecture, and Ministry objectives.
  
• Develop and maintain data-driven applications and conduct unit testing.
  
• Troubleshoot and resolve technical issues arising during application implementation, operation, conversion, migration, and post-implementation support.
  
• Participate throughout the full Software Development Life Cycle (SDLC).
  
• Collaborate with business stakeholders and subject matter experts to understand requirements and business goals.
  
• Elicit and document information from diverse business areas and stakeholders.
  
• Conduct user-experience research and translate user stories into viable product enhancements.
  
• Design and implement REST API integrations following established best practices.
  
• Conduct code reviews and ensure high-quality software and adequate unit-test coverage.
  
• Diagnose and resolve application, data integrity, security, configuration, and recovery issues.
  
• Assess and test Change Requests (CRQs) containing technical changes and update them as required.
  
• Participate in release promotions, implementations, patching, change management, and release management activities.
  
• Support application monitoring and troubleshoot production issues.
  
• Install, configure, tune, and administer middleware software and gateways.
  
• Review, analyze, and modify product installation scripts, including encoding, testing, and debugging where required.
  
• Provide post-implementation technical support and resolve technical issues.
  
• Conduct design walkthrough sessions with project teams.
  
• Develop user and system documentation.
  
• Prepare technical documentation explaining solution architecture and implementation.
  
• Deliver knowledge-transfer sessions to project/team members.
  
• Produce technical reports and status updates as required.
  
• Identify and contribute to the effective management of solution-design risks and issues.
  
• Promote industry standards, development best practices, and quality practices across product teams.
  
• Work collaboratively with cross-functional and distributed teams, including developers, architects, designers, project managers, QA professionals, and business stakeholders.
  
• Provide technical leadership and help oversee project quality from a technical perspective.
  

Requirements

Mandatory Technical Skills & Experience

Candidates must demonstrate the following:

Programming & Application Development

• Solid and current programming knowledge, ideally including Java.
  
• Experience in programming and analysis at a senior level.
  
• Experience with one or more programming languages and object-oriented and/or third-generation language development tools.
  
• Experience designing, developing, testing, debugging, documenting, deploying, and troubleshooting applications.
  
• Experience applying current application design patterns and best practices.
  
• Experience with structured methodologies for application design, development, implementation, and maintenance.
  
• Experience developing Internet-ready applications.
  
• Experience with application development and specialized software-package support.
  

Low-Code Development

• Hands-on experience with low-code platforms, particularly Microsoft Power Apps.
  

Azure DevOps / Source Control

• Full understanding and hands-on experience with Azure DevOps.
  
• Experience with GitHub and/or comparable modern source-control/development technologies is highly relevant.
  

Operating Systems

• Solid understanding and practical experience with Windows and Linux server operating systems.
  
• Experience working with Windows- and Linux-based technologies.
  

Databases

• Strong experience with relational and hierarchical database technologies.
  
• Solid working knowledge of Oracle 19c.
  
• Solid working knowledge of DB2 on Windows.
  
• Experience using information-retrieval packages and query languages.
  
• Ability to diagnose and optimize database queries, indexes, and server performance.
  
• Understanding of backup and recovery processes.
  

Middleware & Gateways

• Experience with middleware and gateways.
  
• Experience installing, configuring, tuning, administering, monitoring, and troubleshooting middleware software.
  
• Experience with application development involving middleware technologies.
  

Performance, Monitoring & Support

• Strong performance-tuning capabilities, including the ability to diagnose and optimize queries, indexes, and server performance.
  
• Experience with application monitoring and technical support.
  
• Ability to analyze and resolve data-integrity, security, configuration, and recovery issues.
  
• Ability to provide post-implementation support and troubleshoot technical issues.
  

Change & Release Management

• Experience with change management and release management processes supporting large application implementations.
  
• Ability to assess and test Change Requests (CRQs) with technical content and update them as necessary.
  
• Experience participating in release promotions, implementations, and patching activities.
  

APIs & Integration

• Experience designing and implementing REST API integrations and applying API integration best practices.
  
• Experience with communications protocols and application integration technologies.
  

Security

• Ability to incorporate security requirements into solution design.
  
• Understanding of and ability to comply with OPS security standards and policies.
  

Requirements & User Experience

• Ability to collaborate with stakeholders to understand business goals and delivery outcomes.
  
• Experience eliciting and documenting information from business stakeholders and subject matter experts.
  
• Ability to conduct user-experience research and translate user stories into viable product enhancements.
  

Agile / SDLC

• Experience working in an Agile development environment.
  
• Strong understanding of structured software-development methodologies and the complete SDLC.
  

Documentation & Knowledge Transfer

• Ability to provide user and system documentation as required.
  
• Ability to prepare detailed technical and architectural documentation.
  
• Ability to conduct design walkthroughs.
  
• Ability to deliver knowledge-transfer sessions to technical teams.
  
• Ability to prepare reports, technical updates, and project documentation.
  

Communication & Professional Skills

• Excellent analytical, problem-solving, and decision-making skills.
  
• Strong verbal and written communication skills.
  
• Strong interpersonal and negotiation skills.
  
• Ability to work effectively with technical and non-technical stakeholders.
  
• Strong troubleshooting and issue-resolution capabilities.
  
• Ability to collaborate effectively with cross-functional and distributed teams.
  
• Strong leadership abilities and ability to provide technical direction.
  
• Demonstrated ability to meet deadlines and deliver high-quality work.
  
• Strong team-player mindset with the ability to support developers, testers, and end users.
  
• Ability to manage competing priorities and contribute to project risk and issue management.
  

Additional / Desirable Experience

The following experience would be considered an asset:

• Rapid Application Development (RAD) methodologies.
  
• Information Management principles, concepts, policies, and practices.
  
• Power Apps and other emerging low-code technologies.
  
• Middleware and gateway technologies.
  
• Installation-script development, modification, testing, and debugging.
  
• AODA and related accessibility regulations and standards.
  
• Experience providing user and system documentation.
  
• Experience conducting technical design walkthroughs.
  
• Experience providing post-implementation technical support.
  

Important Work Requirement

This is a fully onsite position. The successful candidate must be available to work onsite 5 days per week at the designated Ontario Public Service office location.

Candidates should be prepared to work 7.25 hours per day, Monday through Friday, between 8:00 AM and 5:00 PM, excluding lunch breaks.

Ideal Candidate Profile

The ideal candidate is a senior hands-on software developer who combines strong programming and application-development expertise with database, middleware, infrastructure, DevOps, integration, troubleshooting, and production-support capabilities.

A strong candidate will have demonstrated experience working across the complete application lifecycle—from requirements and solution design through development, testing, deployment, release management, production support, documentation, and knowledge transfer—with particular strength in Java, Power Apps, Azure DevOps, Oracle 19c, DB2, Windows/Linux, REST APIs, middleware, performance tuning, and technical change/release management.

Requirements
Mandatory Technical Skills & Experience Candidates must demonstrate the following: Programming & Application Development Solid and current programming knowledge, ideally including Java. Experience in programming and analysis at a senior level. Experience with one or more programming languages and object-oriented and/or third-generation language development tools. Experience designing, developing, testing, debugging, documenting, deploying, and troubleshooting applications. Experience applying current application design patterns and best practices. Experience with structured methodologies for application design, development, implementation, and maintenance. Experience developing Internet-ready applications. Experience with application development and specialized software-package support. Low-Code Development Hands-on experience with low-code platforms, particularly Microsoft Power Apps. Azure DevOps / Source Control Full understanding and hands-on experience with Azure DevOps. Experience with GitHub and/or comparable modern source-control/development technologies is highly relevant. Operating Systems Solid understanding and practical experience with Windows and Linux server operating systems. Experience working with Windows- and Linux-based technologies. Databases Strong experience with relational and hierarchical database technologies. Solid working knowledge of Oracle 19c. Solid working knowledge of DB2 on Windows. Experience using information-retrieval packages and query languages. Ability to diagnose and optimize database queries, indexes, and server performance. Understanding of backup and recovery processes. Middleware & Gateways Experience with middleware and gateways. Experience installing, configuring, tuning, administering, monitoring, and troubleshooting middleware software. Experience with application development involving middleware technologies. Performance, Monitoring & Support Strong performance-tuning capabilities, including the ability to diagnose and optimize queries, indexes, and server performance. Experience with application monitoring and technical support. Ability to analyze and resolve data-integrity, security, configuration, and recovery issues. Ability to provide post-implementation support and troubleshoot technical issues. Change & Release Management Experience with change management and release management processes supporting large application implementations. Ability to assess and test Change Requests (CRQs) with technical content and update them as necessary. Experience participating in release promotions, implementations, and patching activities. APIs & Integration Experience designing and implementing REST API integrations and applying API integration best practices. Experience with communications protocols and application integration technologies. Security Ability to incorporate security requirements into solution design. Understanding of and ability to comply with OPS security standards and policies. Requirements & User Experience Ability to collaborate with stakeholders to understand business goals and delivery outcomes. Experience eliciting and documenting information from business stakeholders and subject matter experts. Ability to conduct user-experience research and translate user stories into viable product enhancements. Agile / SDLC Experience working in an Agile development environment. Strong understanding of structured software-development methodologies and the complete SDLC. Documentation & Knowledge Transfer Ability to provide user and system documentation as required. Ability to prepare detailed technical and architectural documentation. Ability to conduct design walkthroughs. Ability to deliver knowledge-transfer sessions to technical teams. Ability to prepare reports, technical updates, and project documentation. Communication & Professional Skills Excellent analytical, problem-solving, and decision-making skills. Strong verbal and written communication skills. Strong interpersonal and negotiation skills. Ability to work effectively with technical and non-technical stakeholders. Strong troubleshooting and issue-resolution capabilities. Ability to collaborate effectively with cross-functional and distributed teams. Strong leadership abilities and ability to provide technical direction. Demonstrated ability to meet deadlines and deliver high-quality work. Strong team-player mindset with the ability to support developers, testers, and end users. Ability to manage competing priorities and contribute to project risk and issue management. Additional / Desirable Experience The following experience would be considered an asset: Rapid Application Development (RAD) methodologies. Information Management principles, concepts, policies, and practices. Power Apps and other emerging low-code technologies. Middleware and gateway technologies. Installation-script development, modification, testing, and debugging. AODA and related accessibility regulations and standards. Experience providing user and system documentation. Experience conducting technical design walkthroughs. Experience providing post-implementation technical support. Important Work Requirement This is a fully onsite position. The successful candidate must be available to work onsite 5 days per week at the designated Ontario Public Service office location. Candidates should be prepared to work 7.25 hours per day, Monday through Friday, between 8:00 AM and 5:00 PM, excluding lunch breaks. Ideal Candidate Profile The ideal candidate is a senior hands-on software developer who combines strong programming and application-development expertise with database, middleware, infrastructure, DevOps, integration, troubleshooting, and production-support capabilities. A strong candidate will have demonstrated experience working across the complete application lifecycle—from requirements and solution design through development, testing, deployment, release management, production support, documentation, and knowledge transfer—with particular strength in Java, Power Apps, Azure DevOps, Oracle 19c, DB2, Windows/Linux, REST APIs, middleware, performance tuning, and technical change/release management.