Top Software Engineer Jobs in Toronto

As a Senior Software Engineer, you'll lead technical design and delivery of new banking experiences, ensuring robust system architecture and collaborating with cross-functional teams.

Build and own core components of an LLM-powered agent platform: orchestration, tool integrations, APIs, knowledge/memory infrastructure, trust & safety, and evaluation tooling. Partner with Operations to translate workflows into agent capabilities, mentor teammates, and ship production-ready, scalable AI-native systems.

Architect and build a full-stack platform spanning React frontends and Node.js backends. Lead technical decisions, design and optimize GraphQL/REST APIs and databases, improve observability, implement testing strategies, mentor engineers, introduce new technologies, and drive cross-team technical initiatives to deliver scalable, reliable software.

As a Senior Software Engineer in Server Security, you will enhance MongoDB's security features, focusing on distributed systems, cryptography, and networking protocols while collaborating across teams to ensure quality and security best practices.

Build tools and infrastructure for training language and multi-agent models in interactive environments; research and implement advances in language modeling and reinforcement learning; contribute to publications and open-source projects.

Develop, review, and maintain full-stack .NET web applications across the FacilityOS platform. Participate in code reviews, use static analysis tools, troubleshoot staging/production issues, collaborate with engineering and project managers, and research platform improvements.

Lead design and build of a real-time observability and root-cause analysis system for high-density GPU fabrics. Collect, reduce, correlate telemetry from switches, hosts, NICs, GPUs, and services; model topology and ownership; separate fabric faults from host/driver/RDMA/scheduler issues; and produce operator workflows for triage and remediation.

Build AI-native, full-stack features end-to-end using Go, React, and TypeScript. Invent developer-facing interfaces for autonomous pipelines, prioritize reliability, observability, and operate distributed services using Honeycomb, Datadog, and Rollbar.

Design, build, and iterate on fullstack systems for AI agents. Collaborate with teams to enhance UX and contribute to internal best practices while engaging in research related to AI technologies.

Develop and maintain client software systems, design user-friendly interfaces, communicate technical issues, conduct testing, and document processes.

Design and develop software solutions for order management and catalog applications, perform requirement analysis, programming, and unit testing.

The Intermediate Software Engineer will collaborate with a Scrum team to develop features, write scalable code, participate in code reviews, and utilize AI tools while focusing on customer needs.

Provide technical leadership and architecture direction for enterprise SaaS platforms and distributed systems. Lead cross-team initiatives, drive scalability, reliability, security, observability, and platform modernization. Influence technical strategy, run architecture and design reviews, reduce technical debt, and mentor senior engineering staff.

Design, develop, test, and maintain scalable Java-based services using Spring Boot and relational databases. Collaborate with product and teams, write clean TDD-driven code, build RESTful APIs, automate tasks and testing, monitor performance, review code, and support production systems.

Join DEeP to build and maintain developer-facing platforms including dashboard, APIs, and tools. Collaborate cross-functionally, contribute code reviews and designs, ensure system scalability and reliability, and develop end-to-end ownership and leadership skills.

Join Sync as a Software Developer to design and deploy full stack applications, focusing on cloud integration, microservices, and security in an agile environment.

You will develop high-performance quantum software components, build benchmarking tools, and lead best practices in software development processes.

Develop high-performance software for optimizing quantum hardware. Responsibilities include authoring libraries, enhancing communication protocols, benchmarking, and ensuring software quality.

Develop and maintain JIT and AOT hybrid compilation pipelines for PennyLane, focusing on algorithm implementation, R&D for hardware platforms, and software quality.

You will develop and expand pennylane.ai, collaborate with teams, maintain high code standards, and architect scalable frontend systems.

As a Software Engineer, you will create tools and pipelines for AI development, manage data solutions for ML teams, and ensure high-quality code.

Design, develop, and support cloud-native trading, analytics, and risk-management applications on Azure. Integrate market data and AI/ML capabilities, maintain CI/CD pipelines, collaborate with product and business stakeholders, and drive Agile engineering best practices to deliver scalable derivatives technology.

Looking for a Software Engineer to build financial products and tooling for Cash App's Lending team, ensuring quality and compliance while collaborating across domains.

Develop, launch, and maintain backend systems for card issuing and transaction processing. Break down projects, collaborate with product/design/analytics, write clear well-tested code, support operations and on-call duties, create/monitor metrics, perform code reviews, and participate in hiring and team growth activities.

Build full-stack features across a Next.js frontend and FastAPI backend, implement responsive React UIs, integrate AI-powered workflows and streaming responses, consume auto-generated OpenAPI clients, write tests and optimize performance, and collaborate on code reviews and product design.