Top Software Engineer Jobs in Toronto

The Software Engineer will design, develop, and maintain backend APIs, collaborate with cross-functional teams, and optimize system performance for Speechify's platform.

Design and implement product-level authentication, authorization, multi-tenant isolation, and privacy-preserving data lifecycles. Ship security-sensitive changes end-to-end, own application and API security, threat modeling, telemetry for security events, and integrate conservative partner security controls.

Lead front-end feature design and implementation, build high-quality user interfaces, own product components and architecture, collaborate with engineering team, write performant React + TypeScript code, and drive shipping of customer-focused features in a remote-first environment.

Founding full-stack engineer to build front-end and back-end features for month-end close automation, integrate with ERP/HRIS/CRM systems, design backend jobs and data ingestion, ensure code quality and CI/CD, implement LLM-driven workflows, and help grow the engineering team.

The Software Engineer will refine the existing React app and build new features, acting as the frontend expert to debug issues. They will collaborate with a high-performing team in an in-person environment and focus on delivering a polished customer experience.

The software engineer will design, build, and iterate on products for business banking and cash management while managing projects end-to-end.

Own and evolve Directive's web surfaces for Stratos and company sites: build campaign and reporting UIs, integrate ad/CRM APIs, manage background jobs, containers, CI/CD, databases, telemetry, auth, and LLM integrations; stabilize inherited code and ship production features iteratively.

Build the Simulation product as a full‑stack engineer: design and ship AI-powered phishing simulations using LLMs and voice synthesis, create user flows for natural-language simulation creation, scale systems monitoring massive data, and iterate quickly with customers and product teams.

Build backend and full-stack systems powering AI agents for healthcare automations. Own implementation through deployment and monitoring, improve runtime reliability, design workflow/pathway tooling, integrate AI models and browser automation, and collaborate cross-functionally to ship robust production automations.

Develop and enhance a low-latency trading platform while learning proprietary trading methodologies and working with senior traders and developers.

As a Full Stack Software Developer, you'll design and develop scalable applications, collaborate with teams, and apply new technologies in an Agile environment.

As a Full Stack Software Developer, you'll design and develop enterprise applications, collaborate in Agile teams, and work with various technologies.

The Software Engineer will validate and verify flight control systems software, perform testing in alignment with DO-178C standards, and contribute to process improvements.

Drive CI efforts, ensuring reliable and scalable development pipelines, while mentoring other engineers and improving developer productivity through tooling and automation.

Lead design and development of scalable, cloud-native financial and reconciliation systems on GCP. Own architecture, drive technical decisions, mentor engineers, embed AI and automation, collaborate with product and QA, and ensure reliability, performance, and test automation.

Build, operate, and improve a scalable asynchronous platform: monitor system metrics, design and deploy tooling for reliability and efficiency, automate infrastructure (IaC), participate in design and production readiness reviews, capacity planning, document operations, and join on-call rotations to respond to incidents and mitigate customer impact.

Build and maintain core financial backend systems (trading, ledger, billing), transaction processing, reconciliation, and portfolio state management. Design and scale real-time and batch data pipelines, architect APIs and backend services, ensure reliability and observability, and contribute to distributed system design (event-driven, microservices, streaming). Partner with ML teams as needed.

Join the SDK & Extensibility squad to build a TypeScript-first full‑stack platform: SDKs, custom objects, extension marketplace, and an AI-native extension builder. Develop serverless microservices, GraphQL APIs, sandboxed execution, and extensibility primitives; collaborate with product, design, and other squads to deliver safe, discoverable, and multi-tenant extensions.

Build and maintain full-stack features spanning frontend UIs and backend services. Design, develop, test, deploy, and support code; participate in architecture discussions, code reviews, and collaborate with Product and QA. Use AI-assisted coding tools, identify technical debt, and contribute to scalable, reliable solutions.

Join a talent network connecting founding backend engineers with VC-backed startups. Responsibilities include designing and maintaining scalable backend systems, building high-performance APIs and microservices, optimizing databases and data pipelines, defining technical strategy with founders, and establishing best practices for security, DevOps, and cost-efficient cloud infrastructure.

Join a talent network connecting founding front-end engineers with VC-backed startups. Responsibilities include designing and building scalable, high-performance web UIs, optimizing performance and accessibility, creating reusable component libraries, integrating APIs and client-side logic, and defining front-end best practices and testing strategies while collaborating with designers, backend engineers, and founders.

Join a talent network connecting Staff Full Stack Engineers to VC-backed startups. Build and scale full-stack web applications, design APIs and microservices, optimize for performance, scalability and security, collaborate with product and design, and establish best practices for code quality, testing, and CI/CD across cloud-based architectures.

Join a talent network connecting staff front-end engineers with VC-backed startups. Responsibilities include designing and building scalable, high-performance front-end applications, defining front-end architecture and component libraries, improving performance and accessibility, integrating with APIs, establishing testing and CI/CD best practices, and mentoring junior engineers.

Join a talent network connecting founding full stack engineers with VC-backed startups. Responsibilities include designing and building front-end and back-end systems, developing APIs and cloud architectures, collaborating with founders on technical strategy, contributing to technical roadmaps, writing clean code, and establishing engineering best practices.

Join SignalFire's talent network to be considered for Staff Backend Engineer roles at early-stage startups. Responsibilities include designing, building, and maintaining high-performance backend services, APIs, and microservices; optimizing databases, caching, and event-driven systems; ensuring security, fault-tolerance, and cost efficiency; and establishing best practices for DevOps, CI/CD, and monitoring.