Top Software Engineer Jobs in Toronto

Lead the architecture and development of scalable simulation tooling, graphical scenario editors, Python infrastructure, APIs, and SDKs for autonomous-driving validation. Responsibilities include optimizing serialization and validation algorithms, integrating with cloud compute infrastructure, leading technical projects, establishing engineering standards, and mentoring engineers. The role requires expertise in Python, large-scale platforms, 3D graphics, computational geometry, and real-time simulation, with C++, game engine, DSL, visualization, or autonomous-vehicle experience preferred.

Build and improve backend systems, internal tools, and user-facing features in collaboration with leadership and cross-functional teams. Lead initiatives from design through delivery, create scalable and maintainable solutions, contribute to technical direction, and mentor teammates. The role emphasizes autonomy, strong communication, user-centric outcomes, and participation in a mission-driven engineering culture.

Develop Android features from design through launch, build smooth and stable mobile experiences, evaluate technical tradeoffs, collaborate with design, conduct code reviews, and use AI-assisted engineering workflows while maintaining code quality, security, and performance standards.

Build and scale Toast’s earnings platform, including tip pooling, redistribution, wage calculation, and earnings retrieval systems. Develop reliable backend services using event-driven architecture, participate in design through deployment, monitor and troubleshoot performance, test and debug code, conduct reviews, and collaborate with product and design. The role focuses on calculation correctness, scalability, and infrastructure that directly affects restaurant employee pay and product revenue.

Design, develop, test, debug, and maintain cross-platform software using C++ and Python on Windows and Linux. Collaborate on requirements, architecture, and design; conduct code reviews; mentor junior engineers; troubleshoot defects; and document implementations. The role requires expertise in object-oriented programming, multithreading, networking, memory management, build tools, and debugging, with opportunities to contribute to aerospace software development and lead projects.

Build and deploy production LLM agents and automated workflows for business teams. Responsibilities include developing Databricks lakehouse data foundations, integrating SaaS and internal systems, implementing evaluation and monitoring, exposing APIs, creating reusable AI components, and ensuring privacy, cost, reliability, and maintainability. The role partners with engineering, data science, architecture, and business stakeholders, and includes documentation, demos, and occasional travel to New York.

Develop and maintain Zynga’s full-stack advertising technology platform, including SDK and server components. Improve performance, scalability, reliability, and system measurability; integrate third-party mobile advertising networks; translate product requirements into technical solutions; support game teams in production and integrations; and collaborate on architecture, emerging technologies, automation, and technical debt reduction.

Develop backend systems and continuous delivery platforms that improve developer productivity, automation, release safety, and software delivery speed. Collaborate with engineering teams and stakeholders, balance speed with reliability, write tested and extensible code, debug large codebases, participate in code reviews, and contribute to team growth.

Build and maintain scalable integration and end-to-end test automation frameworks and CI pipelines. Optimize test execution, improve stability and reporting, support engineering teams with triage and best practices, write technical specs/ADRs, participate in on-call rotation, and collaborate across regions to evolve the companys test strategy and developer productivity tooling.

Build and launch scalable back-end APIs and web applications for AI-powered customer contact channels. Break projects into phases, collaborate with product, design, and analytics teams, monitor service metrics, support availability and on-call operations, debug code, conduct reviews, and contribute to team development. The role requires ownership, clear communication, and experience with React or Vue plus Python or Kotlin.

Design, develop, troubleshoot, maintain, optimize, and scale cloud-based backend services. Research and evaluate technologies, build new product features with cross-functional teams, improve existing functionality, write clean code, and support high-quality customer releases.

Build, launch, and maintain reliable backend systems using Python or Kotlin. Break projects into deliverable phases, collaborate with product, design, and analytics teams, monitor service health, support on-call operations, debug code, conduct code reviews, and contribute to team development. The role requires designing distributed systems, working across large codebases, writing tested and extensible code, and communicating effectively with global engineering stakeholders.

Build and lead medium-sized full-stack projects for MongoDB Atlas Identity and Access Management, covering authentication, authorization, platform security, and user-facing features. Collaborate across ideation, requirements, design, execution, and delivery while working with modern backend and frontend technologies. Ship production code quickly, contribute to team projects, and eventually lead technical design and delivery.

Build and operate ingestion and reconciliation pipelines that match card-network and partner reports against internal transactions. Develop reporting products, produce standardized journals for accounting, support tax and regulatory filing systems, handle sensitive PII for compliance, debug production issues, and collaborate with finance, product, and data teams to automate and scale reconciliation and reporting.

Design, build, scale, and operate high-volume payment APIs and distributed systems serving global traffic. Lead complex engineering projects from requirements through production, improve reliability, performance, observability, fault tolerance, and security, and participate in on-call and incident response. Collaborate across product and engineering teams, use AI-assisted development tools responsibly, and mentor engineers through technical reviews and documentation.

Build end-to-end product features from design through delivery, lead projects and product areas, shape technical systems and engineering practices, make pragmatic scalability decisions, and mentor teammates. The role requires strong frontend or backend expertise with the ability to work across the stack, product intuition, cross-functional communication, and ownership in a growing, mission-driven team.

Lead the technical direction and implementation of large-scale SaaS product features. Build secure, reliable, maintainable, well-tested software; evaluate architectural trade-offs; debug team inefficiencies; and contribute to code reviews, documentation, and complex bug fixes. Collaborate across product, design, and engineering, influence strategy, identify organizational blockers, mentor engineers, and improve engineering practices around testing, performance, security, privacy, and reliability.

Design and build highly scalable cloud-native microservices, RESTful APIs, and distributed systems for Morningstar’s data delivery platform. Translate business requirements into technical solutions, contribute to architecture and modernization, champion testing, observability, CI/CD, and operational excellence, resolve production issues, evaluate emerging technologies including generative AI, and mentor engineers across agile teams.

Build and launch full-stack customer-facing features and backend services for Affirm Card. Collaborate with product, design, analytics, and engineering teams; design scalable APIs, support distributed systems, monitor service reliability, participate in on-call operations, review code, and contribute to technical planning and team development.

Develop and architect backend-focused full-stack features for Words With Friends using C#, Ruby on Rails, Unity, cloud infrastructure, APIs, databases, and DevOps practices. Responsibilities include designing gameplay systems, optimizing performance, managing deployments and live operations, writing tests, reviewing code, collaborating cross-functionally, documenting solutions, contributing to architecture, improving development workflows, and mentoring junior engineers.

Lead full-stack software development across the software development lifecycle, owning technical design and fault-tolerant application architecture. Build user-facing and server-side systems using modern programming languages, databases, and cloud services. Establish engineering standards, improve developer tools and frameworks, contribute to high-level design, solve complex technical problems, and mentor junior and intermediate engineers.

Lead technical strategy for Cash App Banking’s server engineering team, drive architectural and infrastructure improvements, contribute hands-on code and designs, influence cross-functional technical decisions, and mentor engineers. Build robust, scalable banking systems using distributed services and modern cloud technologies while advancing AI adoption across the team.

Build and maintain customer identity and authentication services for registration, login, authorization, MFA, step-up authentication, and account lifecycle flows. Develop backend APIs in Python or Kotlin, integrate Okta, Auth0, and ForgeRock, write automated tests, participate in code reviews, deploy features, debug production services, improve reliability, and collaborate with engineering, product, and security teams under mentorship.

Build and scale MongoDB Atlas Agent Engine, including its developer CLI, SDKs, runtime, memory, retrieval, identity, and governance layers. Design and deliver well-tested distributed systems, shape architecture, improve performance and reliability, conduct code reviews, establish development practices, collaborate across teams, mentor engineers, and own complex projects. The role is remote within Canada and focuses on high-scale compute, foundational cloud services, and concurrent software.

Leads the technical direction and implementation of large-scale product features. Builds secure, reliable, maintainable, and well-tested full-stack software; evaluates technical trade-offs; collaborates with product and design teams; resolves production issues; contributes to reviews and documentation; and mentors junior engineers.