Senior Software Engineer

Role overview Own the design and evolution of billing and invoicing software that supports large volumes of payment activity. This senior engineering role combines hands-on development with architectural decisions, production reliability, security, and technical leadership. The work spans complex existing systems and close coordination with product, engineering, and QA colleagues.

Responsibilities - Build and maintain billing and invoicing services using C# and/or PHP. - Make design decisions for billing components and improve system capacity, database performance, and maintainability. - Use AI coding assistants throughout development, while independently checking generated work for correctness, security, performance, and quality. - Improve delivery pipelines and development practices; strengthen monitoring, logging, and alerting. - Review code, lead technical discussions, mentor junior engineers, and help teams use AI tools safely and effectively. - Address production issues and communicate progress, risks, and technical choices across teams.

Requirements - At least five years building complex software in a collaborative environment, with a computer science degree or equivalent experience. - Advanced C# and/or PHP skills, with a strong grounding in object-oriented design and software patterns. - Experience designing scalable distributed systems and tuning databases for performance. - Knowledge of application security and compliance practices, including OWASP and PCI requirements. - Able to translate business needs into technical designs, review code, and troubleshoot evolving systems with limited documentation. - Production experience with Claude and Cursor, plus sound judgment about reviewing AI-generated code and protecting sensitive data.

Nice to have - Experience with accounting, billing, or invoicing software; automated testing, CI/CD, containers, and production monitoring or logging tools.

Benefits and work setup - Remote work, a 40-hour week with flexible hours, and paid vacation, personal wellness, sick time, and holidays. - Health, dental, life, disability, and travel-related coverage, plus an employee assistance program. - Compensation is listed as CAD 100,000–120,000, depending on experience; colleague recognition and employee referral programs are also offered.