backend web developer jobs in Toronto

JOB SUMMARY Seeking a Software Developer V with a strong backend focus to design and review services and REST APIs. This role involves leading the orchestration of multiple upstream services, guiding the team on scalable and stateless service design, and defining API contracts, error handling, and resiliency patterns. The developer will support team members...

Senior Backend Engineer### Senior Backend EngineerApply: Remote Canada (ON): Full time: Posted 30+ Days Ago: R49905## ## Job Description:# **Senior Software Engineer (AI-First, Agentic AI)**# **Remote Canada****Compensation & Role Details**Expected Salary Range: $130,000 - $170,000 CAD, depending on experience and qualificationsRole Type: New RoleAI...

At eBay, we're more than a global ecommerce leader — we’re changing the way the world shops and sells. Our platform empowers millions of buyers and sellers in more than 190 markets around the world. We’re committed to pushing boundaries and leaving our mark as we reinvent the future of ecommerce for enthusiasts. Our customers are our compass,...

Job Title Python Backend & System DesignLocation Toronto, CanadaJob Type ContractJob Overview We are seeking a Senior Platform Engineer with 4–6 years of experience in Python backend development, API design, and system architecture. The ideal candidate will have a strong foundation in software engineering principles and hands‑on experience building...

Cohere is hiring a Backend Engineer to optimize model inference systems. You will build low-latency serving infrastructure, implement batching strategies, and develop the backend services that power Cohere's enterprise API.Requirements5+ years of backend engineering experienceStrong proficiency in Go, Rust, or C++Experience with high-throughput, low-latency...

Build high-traffic APIs with Python, Go, or Rust at Perplexity, shaping infrastructure for developers and AI agents at global scale.As a backend engineer on the API Platform team, you will design, implement, and operate mission-critical interfaces. Your work spans distributed systems, API gateways, routing, performance optimization, and agent orchestration....

Overview The Backend Engineer on the AI Platform team plays a critical role in building and evolving the backend systems that power internal products, customer-facing capabilities, AI-enabled workflows, and operational decision-making across the organization. This role is responsible for designing, building, testing, and operating reliable, scalable, and...

US Mobile is building the future of wireless communication. The goal: one unified network open to any person and any device, worldwide. Connection without walls. We’re getting there by empowering customers. All three major networks on one phone and one plan, plus home internet from Starlink. No lock-in. No commitments. Custom fit plans at every price...

About Cognichip At Cognichip, we are building AI-native tools that transform how semiconductor engineers create, verify, and optimize chips. Our platform combines large proprietary models, agentic workflows, domain-specific engineering intelligence, and high-performance simulation infrastructure to accelerate one of the world’s most complex engineering...

About Venn Venn is the fastest-growing B2B fintech in Canada. We're on a mission to transform business banking for Canadian entrepreneurs and are looking to hire A-players interested in disrupting traditional banking practices. As the ONLY digital banking platform in Canada offering a truly modern solution, we have seen accelerated growth—scaling to...

OX Security is securing the AI-driven SDLC from prompt to production. We're building the next generation of security technology for a world where AI is changing how software is built, deployed, and attacked. We're looking for a strong Senior Backend Engineer to join VIBESEC, the team building our AI security products. This is one of the most exciting...

Join BiblioCommons as a Senior Backend Engineer in Toronto and lead the development of innovative library solutions. Enhance your skills while building scalable systems that serve millions each month. This position focuses on implementing resilient systems and mentoring team members, contributing significantly to the growth of the business. You will lead...

Drive product innovation at Bettermode as a Staff Backend Engineer, working on AI features and scalable solutions in a hybrid environment. Your expertise will shape customer engagement. As a Staff Backend Engineer at Bettermode, you will spearhead backend development focusing on TypeScript, NestJS, and AI solutions. The role blends technical leadership with...

Build scalable Java backend services remotely for Just Eat Takeaway.com from Alberta, Manitoba, or Ontario. Apply strong system design expertise. As a Senior Java Developer, you will support the Logistics Areas and Fees team. You will architect, develop, and operate distributed systems for delivery calculations. The work includes Java 21, REST APIs, message...

Web Analytics Lead at The Home Depot in Toronto, ONM3C 4H9 Job Description Pay Range: $95,000 - $125,000 At The Home Depot Canada, we want you to feel valued and supported. The pay range you see represents base salary only. In addition, your total rewards may include: semi-annual bonuses tied to business performance; Deferred Profit-Sharing Program to assist...

About Venn Venn is the fastest-growing B2B fintech in Canada. We're on a mission to transform business banking for Canadian entrepreneurs and are looking to hire A-players interested in disrupting traditional banking practices. As the ONLY digital banking platform in Canada offering a truly modern solution, we have seen accelerated growth—scaling to...

About Us At Bettermode, we are redefining how businesses streamline customer experiences and foster strong relationships. Our platform empowers businesses to seamlessly craft powerful web apps with engagement tools in its core tailored to their unique needs. Backed by Silicon Valley investors and trusted by brands like Lenovo, Mercedes, and IBM, we're proud...

Graphic Web Designer Our client is one of Canada's premier providers of Registered Education Savings Plans. With assets over $1.3 billion, the company offers some of Canada's highest-performing, safest and most flexible RESP products. Headquartered in Toronto, the company employs approximately 90 people and has relationships with more than 1,800 sales...

Elevate your career as a Backend Engineer at Snap Inc., focusing on scalable services. Join a team passionate about innovation in technology and user engagement. This Backend Engineer Level 3 role involves designing, implementing, and operating critical services for Snap's applications. You will dive into product requirements, collaborating across teams to...

Secure Every Identity, from AI to Human. Identity is the key to unlocking the potential of AI. Okta secures AI by building a trusted, neutral infrastructure that enables organizations to safely embrace this new era. This work requires a relentless drive to solve complex challenges with real-world stakes. We are looking for builders and owners who operate...