Top Software Engineer Jobs in Toronto

Build and operate Airbnb's global cloud networking infrastructure including service mesh, cross-region gateways, load balancers, and edge security. Work with open-source communities (k8s, Istio), design multi-region cloud network architectures, develop operational tooling, and collaborate with product, engineering, and security teams to optimize network performance and reliability.

As an ML Engineer at Luma AI, you will design high-performance model serving pipelines, manage GPU resources, and optimize CI/CD for large-scale AI systems.

The ML Engineer will integrate model architectures, optimize deployment workflows, maintain CI/CD pipelines, and ensure reliability of inference services across large-scale systems.

The role involves using AI tools to rapidly develop software, working across product and engineering teams, and owning software projects end-to-end.

This role requires shaping technical direction, leveraging AI tools for production systems, and making crucial decisions to align product intent with engineering realities.

Design and build the Neki control plane to provision, scale, and heal sharded PostgreSQL clusters. Implement high-availability, disaster recovery, backup/restore, and migration tooling. Operate distributed, fault-tolerant services on Kubernetes, participate in on-call rotations, and work with customers to translate workloads into platform improvements.

The role involves designing, developing, and maintaining full-stack applications on AWS, implementing backend services and APIs, building user interfaces, and applying secure coding practices.

You will design and implement IAM systems, own authentication and authorization, and ensure secure-by-default principles across Hadrian's API platform.

The Senior Backend Software Engineer will lead product development, maintain systems, design APIs, and mentor junior engineers while improving overall product quality.

The Software Engineer will design and develop product functionality, collaborate with teams, solve complex problems, and learn new technologies while participating in the product life cycle.

As a Mainframe Software Engineer, you'll design and develop applications, analyze requirements, and collaborate with peers while ensuring system reliability and quality.

Senior Software Engineer responsible for developing and maintaining web applications and microservices (React, Golang). Mentor team members, lead code reviews, influence technical decisions, improve CI/CD and testing strategies (unit, E2E, performance), collaborate across teams on integrations, and promote engineering best practices and documentation.

Build and own a physics-based digital twin and simulation platform for off-grid power campuses, modeling PV, BESS, weather, terrain, and dispatch; ship offline-capable field software; collaborate with electrical, mechanical, and robotics engineers and validate models against field data.

Design and build Android-based infotainment applications for Rivian and Volkswagen Group OS. Lead architecture, create modular libraries and design patterns, collaborate with product and UI/UX teams, optimize performance, write tests, perform code reviews, integrate with AOSP, and mentor engineers while delivering demo apps and production releases.

As a Staff Software Engineer, you'll lead a team in developing and delivering scalable software solutions for employee management in the restaurant industry, focusing on enhancing customer and employee experiences.

Lead the technical design and delivery of banking features at Cash App, collaborating across teams, driving architecture improvements, and mentoring engineers.

Build and maintain Quora's ML platform and ranking infrastructure to serve large-scale ML models. Work on GPU model serving, distributed systems, developer tooling, feature store modernization, and on-call rotation to ensure high availability, performance, and cost efficiency.

Design, build, and operate eBay's experimentation and feature-flag platform across the full stack. Implement scalable, low-latency services (NodeJS/Java), develop React frontends, drive architecture and observability, collaborate with data scientists and stakeholders, and own production reliability and incident response.

Join the Invoice Simple Core team to design, implement, test, and ship TypeScript-based web and mobile features. Collaborate with product and senior engineers, follow engineering standards, improve maintainability, and support the full app lifecycle from development to production.

Lead frontend-focused development of Pebl's conversational AI assistant, designing and building UX for streaming responses, agentic workflows, prompt/tool integrations, and resilient failure recovery. Own frontend and supporting backend contracts, mentor engineers, prototype new interaction patterns, and troubleshoot production AI-specific issues.

Join Zip's Core Infrastructure team to design, build, and operate global multi-region architectures. Own infrastructure components such as Kubernetes, AI infra, observability, deployment pipelines, and cost optimization. Collaborate with engineering teams to ensure scalable, reliable systems and support Zip's product roadmap.

Design and build features for the SFS banking platform, onboard Block products, build secure fault-tolerant systems handling sensitive financial data, ensure service reliability, remediate incidents, and create durable operational fixes.

Develop, design, and maintain scalable mainframe-host applications (CIF, PRTCL) using COBOL, IMS, DB2 and z/OS. Troubleshoot incidents, conduct root-cause analysis, estimate work, participate in agile ceremonies, produce design artifacts, and collaborate with stakeholders to ensure secure, high-performance, and compliant solutions.

Build and modernize the Nylas Dashboard and related full‑stack product surfaces. Own frontend shell, shared components, backend APIs, data models, permissions, and integrations. Implement AI-native and agent-facing experiences, optimize performance, improve onboarding and observability, and create reusable platform patterns while partnering with product, design, backend, and customer-facing teams.

Design, build, test, deploy, and maintain scalable full‑stack web applications. Create responsive React frontends and Java/Spring Boot backend services on AWS. Develop RESTful APIs, database integrations, automated tests, CI/CD pipelines, and monitor performance. Collaborate with product, design, and architecture teams, participate in code reviews, write technical designs, mentor junior engineers, and apply secure, accessible, and performant engineering practices.