Top Software Engineer Jobs in Toronto

As a Staff Full Stack Software Engineer, you will design and build foundational infrastructure, develop enterprise features, and ensure system reliability handling sensitive legal data.

As a Senior or Staff Software Engineer on the Localization team, you will design algorithms for state estimation systems, optimizing multi-sensor data fusion for real-time vehicle localization in autonomous driving.

As a Senior Software Engineer on the Mapping team, you will architect and develop robust, scalable systems for autonomous vehicle mapping, collaborating with multidisciplinary experts and handling complex data processing.

Develop software solutions, guide teams on cloud technologies, analyze requirements, resolve issues, and lead module execution while ensuring compliance with best practices.

Seeking a Senior Software Development Engineer in Test to architect and maintain test infrastructure, automation frameworks, and build CI/CD pipelines for cloud-based products. Responsibilities include mentoring, improving test strategies, and ensuring software quality and performance.

Lead design and delivery of platform capabilities for a federated GraphQL and event-driven architecture. Build and optimize gRPC endpoints, GraphQL APIs, and SQL/Postgres queries. Own observability (DataDog, Bugsnag), scalability, reliability, incident response, and integrations. Mentor engineers and drive cross-team technical efforts to reduce friction and accelerate product delivery.

Own IAM platform architecture and strategy, design OAuth2/OIDC flows and token lifecycle, drive cross-team technical decisions, de-risk and resolve production IAM issues, set engineering standards, mentor, and align with product and security stakeholders.

Own the technical direction of a core Helius backend system, including architecture, reliability, performance, roadmap, and production operations. Design scalable distributed systems, storage, streaming, or edge infrastructure; drive profiling and performance improvements; establish operational excellence; partner with founders on strategy; mentor engineers; and lead ambiguous cross-team initiatives.

Own and advance a core Helius backend system supporting Solana infrastructure. Design and release high-performance products, optimize latency and throughput, make architectural decisions, improve observability and incident response, and mentor engineers. The role requires end-to-end ownership of production systems at scale, with close collaboration with founders and engineering leadership. Relevant systems include data streaming, historical APIs, account indexing, and access control infrastructure.

Execute scheduled, ad hoc, and release-milestone software tests; review test cases; report defects in issue-tracking systems; communicate status in standups; and collaborate with software test managers and development teams. The role requires knowledge of QA methodologies, black-box, grey-box, and white-box testing, strong communication and organization, independent and team-based work, and participation in planning and professional meetings.

Design, build, and operate integrations, APIs, data exchange systems, and AI-enabled connections for accounting and ERP platforms. Own integration pipelines, SLAs, data contracts, observability, and production support. Provide technical direction through architecture reviews, code reviews, and pair programming while partnering cross-functionally on roadmap decisions. The role requires hands-on software development, scalable data architecture, secure integrations, experimentation, and participation in an on-call rotation.

Develop and optimize Elasticsearch performance across distributed and serverless architectures. Build performance models, profiling and benchmarking workflows, regression detection, and AI-assisted optimization harnesses. Analyze bottlenecks in logging, metrics, vector search, and ES|QL; implement scalable, thread-safe, high-performance Java code; and collaborate across teams through technical reviews and guidance. Experience with JVM internals, distributed systems, performance engineering, and benchmarking is required.

Lead architectural and code-level performance engineering for Elasticsearch. Own major optimization initiatives, develop performance models, profile distributed systems, identify bottlenecks, build benchmarks and regression detection, and improve scalability across stateful and serverless architectures. Develop AI-assisted optimization and benchmarking harnesses, collaborate across teams, and mentor engineers. Work includes Java and JVM optimization, concurrency, distributed systems, vector search, storage engines, and native library integration.

Lead architecture and technical direction for the NHI Governance domain, owning complex server-side initiatives to discover, assess, and remediate non-human identities across cloud and on-prem environments. Define standards, interfaces, and contracts; drive quality, security, observability, performance; mentor senior engineers; and partner with product and design to align technical strategy with business goals.

The Senior Staff Engineer at Kaseya is responsible for architecting scalable Java applications, optimizing AWS cloud solutions, and providing technical leadership and mentorship while solving complex problems in a collaborative team environment.

Join a research-focused team to integrate AI (LLMs and autonomous agents) into mobile platform development. Build AI-driven code generation and agentic systems, design core mobile components, and collaborate across teams to deploy AI-enhanced developer tooling and monitoring for HarmonyOS and large-scale mobile ecosystems.

Own and maintain data platform infrastructure: provision Snowflake via Terraform, build CI/CD for dbt, implement data quality and observability, extend the OpenMetadata catalog, create developer tooling and reproducible environments, and ensure secure, production-ready data pipelines.

The Senior Software Developer will lead development for SOTI's mobile management solutions, focusing on scalable applications using C# and .NET, while collaborating with agile teams.

Develop and design scalable applications in a team-based Agile environment, collaborating on features and exploring new technologies.

Build enterprise applications as a Senior Software Developer, focusing on full stack development within an Agile team using various technologies.

Design and develop motion planning software and algorithms for self-driving vehicles, collaborating with engineers and researchers while maintaining progress on long-term goals.

The role involves advancing onboard sensor systems for autonomous vehicles, solving integration issues, and collaborating with multidisciplinary teams.

Design and build scalable, high-performance web applications using Next.js, React, Vue.js, and TypeScript. Own end-to-end feature development, create reusable UI components, optimize performance (SSR/SSG, lazy loading, Core Web Vitals), ensure accessibility and security, support CI/CD and deployments, conduct automated testing, mentor junior engineers, and collaborate with Product, Design, Backend, and DevOps to define and deliver front-end architecture and features.

As a Senior Software Engineer, you will design and deliver user-friendly software, manage APIs, and create scalable microservice architectures.

Build and maintain full-stack web applications (PHP/Laravel backend, Vue.js frontend), design architecture, improve reliability via testing and observability, manage databases, optimize systems, collaborate with product and design, and mentor junior engineers.