Mainframe Developer Jobs in Alberta (NOW HIRING)

Java Holdings Ltd. owns a portfolio of companies and provides high-level execution support for large utility, oil and gas, and power generation projects, with a focus on EPCM (Engineering, Procurement, Construction & Management) services. We are seeking a motivated, detail-oriented Developer to join our growing software development team in the Edmonton or Calgary area.

In this role, you will independently deliver high-quality software features, support production systems, and help configure business-critical workflows and integrations. You will work within established architecture and engineering standards while contributing practical ideas to improve quality, reliability, and team effectiveness.

This position is designed for a mid-level developer with 3-5 years of professional experience who is comfortable taking ownership of assigned work, collaborating with technical and business stakeholders, and escalating risks or design gaps when needed.

• Develop and deliver assigned front-end components, back-end services, APIs, and application features.
• Write clean, maintainable, secure, and well-documented code in accordance with team standards and established architectural patterns.
• Create and maintain automated tests to support solution quality and reliable releases.
• Troubleshoot and resolve defects, production issues, and application performance concerns.
• Participate in peer code reviews, sprint planning, refinement, testing, and release activities.
• Work with React, C#/.NET, RESTful APIs, Entity Framework Core, Microsoft SQL Server, and PostgreSQL.
• Configure internal and external systems to meet documented project requirements, including complex business rules and digital quality documentation.
• Configure integrations using approved tools, patterns, and standards, and escalate gaps or new integration needs to senior technical resources.
• Collaborate with stakeholders to understand requirements, identify implementation considerations, and support User Acceptance Testing.
• Maintain technical documentation and provide system training or user guidance when required.
• Communicate risks, blockers, and concerns promptly while adapting to evolving requirements and priorities.

• Consistent delivery of reliable, maintainable features that meet documented requirements.
• Effective participation in code reviews, technical discussions, and team planning.
• Accurate system and integration configuration using approved tools and patterns.
• Prompt communication of risks and steady growth in technical and business knowledge.
• Positive contribution to production stability, documentation quality, and overall team effectiveness.

• Join a growing core development team building and improving business-critical internal systems.
• Work on meaningful operational challenges across construction execution, workforce processes, integrations, reporting, mobile workflows, and platform modernization.
• Develop your skills through collaboration with experienced developers, technical leadership, and business stakeholders.
• Contribute to a team culture that values accountability, learning, practical problem-solving, and coding excellence.
• Receive a competitive salary and benefits package.

Requirements

• 3-5 years of professional software development experience.
• Proficiency in JavaScript and React for front-end development.
• Experience with C# and .NET for back-end development.
• Strong SQL skills and hands-on experience with PostgreSQL and/or Microsoft SQL Server.
• Experience building or supporting RESTful APIs and modern web applications.
• Experience using Entity Framework Core or a comparable object-relational mapping framework.
• Strong troubleshooting skills and experience supporting production systems.
• Ability to understand how application components, services, integrations, and data fit together.
• Ability to independently deliver assigned features while following technical direction and established standards.
• Clear communication, sound judgment, attention to detail, and effective collaboration skills.
• Comfort working in a fast-paced, deadline-driven environment with changing priorities.
• Ability to travel internationally for site visits and system rollouts when required.

• Integration development experience, including system-to-system data flows and scheduled processing.
• Experience with Hangfire or a similar background job scheduling framework.
• Knowledge of CI/CD pipelines, source control practices, and DevOps workflows.
• Experience with personnel management, employee record, occupational health and safety, or construction-tracking systems.
• Experience in construction, infrastructure, electrical utility, oil and gas, or power generation environments.
• Experience with SharePoint 2019 or later, document control systems, mobile workflows, GIS, scheduling, or material management solutions.

Benefits

• Extended Healthcare Plan (Medical, Disability, Dental)
• RPP - Group RRSP
• Group Life - AD&D - Critical Illness Insurance
• Paid Time Off Benefits
• Training & Development
• Employee Assistance Program - Counseling