Backend Developer Jobs in Ontario, Canada

Unity Ads team builds real‑time systems powering Unity’s global advertising platform. Staff Backend Developer designs, builds, and modernises backend services and APIs that support ad delivery, bidding, reporting, and analytics.

Scheduling Hybrid Network team at Just Eat Takeaway.com builds the backend services that power the courier network. The Senior Backend Developer designs, models, and operates event‑driven services in Java and Node.js, ensuring reliability, observability, and scalability.

Trainerize powered by ABC Fitness Solutions builds scalable technology for fitness businesses worldwide. The Lead Backend Developer designs APIs and data layers, improves performance and reliability, and mentors the team while partnering with frontend, product, and DevOps.

Diagnostics team at Unity builds the data backbone that lets game developers understand live performance. As a senior backend engineer you design ingest pipelines, ClickHouse storage, and dashboards, while mentoring peers and setting AI‑assisted coding standards.

Lithic’s Treasury team builds the backend services that manage the flow of funds between Lithic and third parties, including ledger, ACH and wire infrastructure, and reconciliation. The Senior Software Engineer leads initiatives to ensure high reliability, correctness, and scalability of these systems while shipping new features for Lithic customers.

Senior Software Engineer with 5+ years of backend development experience in billing and accounting systems for the utility sector. Lead design reviews, mentor team members, and implement best practices in Oracle/PLSQL and MS SQL Server environments.

User Profile team at StackAdapt builds low-latency backend systems and data pipelines for user profiling, audience building, and rule enforcement across the adtech platform. The role architects scalable microservices, leads technical design, and mentors engineers while collaborating with Bidding, Data Science, and other stakeholders.

Engineering at Swiftly builds scalable cloud services for transit data platforms. The Senior Software Engineer works across backend (Java, Node.js, Python) and frontend (Vue.js) to deliver end‑to‑end features, prototype quickly, and mentor teammates.

Join Twilio’s Developer Platform Experience team to build internal tools that power the company’s cloud infrastructure and developer platform. You’ll develop backend, frontend, and client‑side applications, write runbooks, support 24x7 on‑call, and own medium‑sized features.

Lead Software Engineer at Datasite drives technical strategy, builds scalable backend systems, and mentors teams across multiple locations. The role blends architectural leadership with hands‑on development, ensuring high‑quality, reliable services that meet business and customer needs.

Autodesk is seeking an experienced Software Developer (Full Stack) to join the Architecture, Engineering and Construction (AEC) Platform Data team. The role involves delivering APIs, backend services, and frontend software across the full software development lifecycle, collaborating with product, design, and software architects, ensuring code quality, security, reliability, scalability, and performance through testing, code reviews, and best practices.

Hyper AI Agent Platform team at Motorola Solutions builds mission‑critical conversational AI to assist 911 telecommunicators. The Senior Software Engineer will lead architecture of real‑time voice AI pipelines, LLM orchestration, and backend infrastructure, mentor engineers, and drive reliability and performance standards.

AI Agent Platform team at Motorola Solutions builds real-time voice AI features for emergency response workflows, designing LLM‑powered systems that assist 911 telecommunicators. The Junior Software Engineer will develop full‑stack components—from backend services and AI pipelines to frontend interfaces—while participating in on‑call rotations and ensuring test, security, and observability standards.

Identity, Platform and Business Intelligence team at Calabrio‑Verint builds core platform services including identity management, user management and data pipelines. The Senior Software Engineer architects and develops scalable backend services on AWS, designs event‑driven microservices, and implements data lake integrations while supporting production on‑call rotation.

Digital Billing Engineering DevOps team at TELUS Digital builds and maintains the Kenan billing support platform, focusing on migration to the new EBG system. The Senior Software Developer designs, implements, and optimizes Java and Node.js backend services, data transformation pipelines, and GCP/Kubernetes infrastructure while ensuring security for Government of Canada contracts.

Platform Team builds the services and APIs that power large-scale business operations. The Senior Software Engineer designs and develops backend systems, creates reusable integration patterns, and productionizes AI-enabled workflows with observability and human-in-the-loop controls.

Core Services Site Reliability Engineering team at StackAdapt builds and operates self‑healing systems that enable reliable, scalable backend services. The role maintains tooling, libraries, and infrastructure, designs cross‑cutting initiatives, and leads security reviews to keep the platform robust.

AEC Data Platform at Autodesk builds cloud‑based collaboration services for Autodesk design tools. The Principal Software Developer leads the design and implementation of scalable backend services, mentors the engineering team, and ensures high‑quality, secure cloud infrastructure.

Confluent Cloud AI Platform builds the AI layer that lets customers run machine learning and AI agents directly on real-time streaming data. The role designs and builds backend services in Go, Java, and Python, owns end‑to‑end feature delivery, and ensures reliability of inference infrastructure across APIs, model lifecycle, and control planes.

Sardine AI Experiences team builds the user-facing interfaces for fraud prevention and AML AI products. The senior engineer designs and delivers polished React/TypeScript features, mentors peers, and leverages AI‑assisted coding tools to accelerate delivery while occasionally extending Go backend services.