Top Tech Jobs & Startup Jobs in Toronto

Provide principal-level technical leadership across complex, globally distributed systems. Establish architecture and technical direction, lead major initiatives, improve engineering practices, mentor senior engineers, solve cross-team problems, and influence executives without formal authority. Remain hands-on with code and production systems while balancing performance, reliability, maintainability, and pragmatic operational constraints at massive transaction volumes.

Develop and test performance creative across static ads, video, motion, UGC, and landing pages. Turn customer insights, product stories, and performance data into concepts, hooks, scripts, and iterations. Analyze creative performance, manage testing roadmaps, identify fatigue, document learnings, and build scalable creative workflows. Collaborate with paid media, product design, product marketing, agencies, and external partners while personally producing high-quality creative.

Own ambiguous product problems across consumer and business fintech audiences, including acquisition, activation, onboarding, account and card products, and financial insights. Identify opportunities through quantitative analysis, user research, and market research; prototype and prioritize solutions; make trade-offs independently; and guide initiatives from problem framing through shipment. The role reports to the Head of Product and works closely with designers and engineers in a small product organization.

Design, build, and maintain backend services and payment infrastructure using NestJS/TypeScript on GCP. Implement ledger systems, payment processing pipelines, and secure APIs, ensure scalability, reliability, and regulatory compliance (PCI, SOC 2), manage infrastructure as code, and collaborate with product and compliance teams to deliver production-grade financial systems.

Build and own user-facing web experiences with a front-end focus using React, Next.js, and TypeScript. Work across the full stack (Node.js/NestJS), design and integrate REST APIs, collaborate with product and design, run growth experiments, ensure accessibility/performance, write tests, support production through on-call rotations, and contribute to payments and banking integrations.

Lead and/or staff-level technical roles to design, build, and operate petabyte-scale batch and streaming data pipelines, APIs, and analytical platforms. Responsibilities include platform architecture, data modeling, query and API design, reliability, observability, performance optimization, cross-team coordination, and mentoring engineers through a transformation to workload-aware, near real-time data systems.

Lead development and ownership of a React Native mobile app (iOS and Android), shipping features end-to-end. Contribute across front-end and back-end, ensure code quality, testing, releases, scalability, and mentor engineers while collaborating with product and design.

Design and lead end-to-end architectures for production machine-learning systems at extraordinary scale. Responsibilities span data preparation, feature generation, model delivery, deployment, hosting, inference, monitoring, performance optimization, and technical design. The role establishes engineering standards, influences ML architecture, and collaborates across data science and software engineering to build reliable, maintainable systems for high-volume, low-latency workloads.

Design and operate globally distributed database systems across bare-metal and cloud environments. Lead reliability, performance, automation, observability, incident response, capacity planning, security, and database change management. Establish technical direction, simplify the infrastructure footprint, develop data-platform roadmaps, troubleshoot complex distributed-system failures, and mentor engineers across teams.

Design and build real-time, highly concurrent software and cloud-native systems for an AI-powered emergency communications platform. Integrate and deploy LLMs, optimize voice and audio-processing pipelines, and support speech recognition, synthesis, detection, and filtering. Contribute to infrastructure, observability, security, scalability, and fault tolerance. Provide technical leadership through architecture decisions, code reviews, mentoring, and engineering best practices.