Software Engineer, Senior

Overview Shift4 (NYSE: FOUR) is boldly redefining commerce by simplifying complex payments ecosystems across the world. As the leader in commerce‑enabling technology, Shift4 powers billions of transactions annually for hundreds of thousands of businesses in virtually every industry. For more information, visit Software Engineer, Senior Summary Shift4 Payments is seeking a Senior Software Engineer to be a key member of a high‑velocity engineering team. In this role, you will work hands‑on with our platform tech stack to design, develop, and maintain high‑quality features. You will collaborate closely with engineering leadership and product teams to ensure alignment with business needs and deliver robust solutions. As a Senior Software Engineer, you will mentor junior engineers, address technical debt, and help drive platform modernization. Responsibilities Feature Development & Technical Leadership: Work within the platform tech stack to deliver high‑quality features, resolve issues, and adhere to best practices. Architecture & Design: Collaborate with team leads and engineering leadership to contribute to technical design and platform architecture development. System Debugging & Support: Diagnose and resolve issues with deployed systems in collaboration with DevOps, providing Level 3 support as needed. Technical Expertise: Become a technical expert in key parts of the platform and contribute to platform modernization and technical debt reduction efforts. Collaboration & Alignment: Work closely with the product team, product owners, and stakeholders to ensure a clear understanding of requirements and ensure alignment with business needs. Mentorship & Development: Mentor junior engineers and support their technical growth and development within the team. Process Improvement: Contribute to the continuous improvement of engineering processes and best practices. Qualifications 8+ years of total relevant industry experience, with a strong focus on backend development and systems integration. 5+ years of experience with Node.js for backend API development, including performance optimization and system integration. 3+ years of hands‑on experience with Python for backend services, automation, and data processing. 3+ years working with JavaScript/TypeScript‑based front‑end frameworks such as React and Next.js (front‑end experience is a plus). 3+ years working in Agile teams, with experience in Scaled Agile (such as SAFe) being highly advantageous. Strong proficiency in Node.js and Python, with the ability to write high quality, maintainable and efficient code. Skilled in modern frameworks such as Next.js for building scalable, high performance applications. Preferred skills Familiarity with Palantir Foundry, including ontology development, data integration, and operational workflows, is a plus. Oracle Fusion ERP (Financial, inventory management or additional related modules) experience is a plus, particularly with backend or data integration use cases. Education BS in Computer Science or related degree or experience in lieu of a degree may be considered. We are an Equal Opportunity Employer and do not discriminate against any employee or applicant for employment because of race, color, sex, age, national origin, religion, sexual orientation, gender identity and/or expression, status as a veteran, and basis of disability or any other federal, state or local protected class. Seniority level Mid‑Senior level Employment type Full‑time Job function Engineering and Information Technology Referrals increase your chances of interviewing at Shift4 by 2x Get notified about new Senior Software Engineer jobs in Greater Toronto Area, Canada. #J-18808-Ljbffr