Senior Backend Developer

country: CA all locations: [Toronto, Ontario] commitment: Full-Time department: location: Toronto, Ontario team: Engineering What You'll Do: Design and development of scalable, service-based architectures (front-end and back-end), while remaining hands-on in coding and delivery Architect and implement system integrations across internal services and third-party platforms (REST, GraphQL, event streams, webhooks, ETL pipelines) Collaborate with Product to translate business requirements into technical solutions, defining scope, complexity, and dependencies Drive development across teams for services built in Node.js, TypeScript, JavaScript, and Python Design and maintain API contracts, data models, and integration patterns to ensure consistency and reliability across systems Build and optimize secure, high-performance, and highly available systems Contribute to AI-enabled features and workflows, including integration of ML models, LLM APIs, or intelligent automation pipelines Partner with architects to define system design, integration strategies, and reusable frameworks Produce clear technical documentation (architecture diagrams, data flows, API specs, integration patterns) Establish and enforce best practices in code quality, testing, and deployment Lead code reviews, approve merges, and mentor engineers across teams Troubleshoot complex production issues and drive resolution across distributed systems Oversee the end-to-end lifecycle of feature development—from design through deployment and monitoring What You Bring: 5+ years of experience building scalable, production-grade software systems across front-end and back-end Bachelor’s degree in Computer Science or a related field Strong expertise in JavaScript and TypeScript Proven experience with Node.js and GraphQL (required) Deep experience building and consuming RESTful APIs and distributed services Strong proficiency with tools and technologies such as Python, Docker, Git, SQL, and cloud-native architectures Hands-on experience with GCP or AWS services (e.g., S3, CloudFront, EC2, RDS, Lambda, Batch) Experience designing and implementing system integrations (microservices, third-party APIs, event-driven architectures, messaging systems like Kafka/SQS) Ability to lead and deliver large, complex technical initiatives Strong understanding of software design patterns, system architecture, and data flow design Excellent communication skills, with the ability to articulate complex technical concepts clearly Experience working in Agile/Kanban environments and a strong understanding of the SDLC Adaptability and a proactive mindset in fast-paced, evolving environments Nice to Have: Experience working on or building tax, fintech, or compliance-related products (e.g., tax calculation engines, filing systems, regulatory platforms) Exposure to AI/ML engineering, including integrating LLM APIs, building data pipelines for ML workflows, or deploying AI-driven features Experience with data platforms, data pipelines, or analytics systems Familiarity with event-driven architectures and real-time data processing Experience designing multi-tenant or enterprise-grade SaaS platforms Background in integration-heavy environments (e.g., ERP, financial systems, external data providers) Salary Range: $100,000 - $140,000 (CAD)