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Senior Ml Systems Engineer in Ontario

28 active opportunities · Updated for October 2026

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Explore current senior ml systems engineer jobs in Ontario. Use filters to narrow by work mode, employment type, experience and date posted.

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Reddit
📍 Ontario• Full-time• Remote
12mo ago

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com . Reddit has a flexible workforce! If you happen to live close to one of our physical office locations our doors are open for you to come into the office as often as you'd like. Don't live near one of our offices? No worries: You can apply to work remotely in any country in which we have a physical presence. Team Description Reddit is poised to rapidly innovate and grow like no other time in its history. We’re currently hiring across three distinct teams: Ad Safety & Verification Team The mission of the Ads Safety & Verification team is to protect the Reddit ads ecosystem so that users have a safe ads experience and legitimate advertisers trust Reddit. This team builds full stack, high scale products that span Reddit’s consumer-facing apps and ads systems. They own integrations with metrics verification and brand safety partners and operate services that scale to reliably handle tens of millions of requests per day. Ads Creative Management (ACM) Team The Ads Creative Management team focuses on the tools and systems advertisers use to create and manage their ad content. From images and videos to headlines and full post creatives, they enable efficient creative management and innovation across the campaign lifecycle. They work closely with AI teams to provide intelligent content suggestions and automation, helping advertisers launch high-quality campaigns faster and more effectively. Brand Innovation Team The Brand Innovation team drives the development of new ad formats that help advertisers maximize reach an

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Reddit
📍 Ontario• Full-time• Remote
Just now

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com . Reddit is entering a period of unprecedented innovation and growth—and there’s never been a more exciting time to join. The Ads Business Engineering team operates at the intersection of engineering, product, sales, and business development, delivering technical expertise and solutions that empower technology partners, agencies, and advertisers to seamlessly integrate with Reddit’s advertising platform. As a key member of this rapidly expanding team, you’ll have the opportunity to take meaningful ownership—driving cutting-edge AdTech integrations, launching and managing strategic partnership programs, and helping scale Reddit’s developer ecosystem. At Reddit, a Business Engineer plays a critical role in driving the success of our advertising API products and platform integrations. This experienced engineer role combines deep technical consulting with hands-on engineering, where you'll guide strategic integrations, often contributing directly to implementation across Reddit’s stack or in the codebases of partners (or direct advertisers). You will be a key technical advisor—trusted to own the end-to-end relationship with Reddit’s most important advertising partners, and execute on the long-term strategy for how we develop an ecosystem of developers. You’ll work across engineering, product, sales, and business development teams to connect Reddit’s capabilities to the evolving needs of the market. You won’t just recommend solutions—you’ll implement them across systems, including platform changes, and also help define framewo

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About Anthropic Anthropic’s mission is to create reliable, interpretable, and steerable AI systems. We want AI to be safe and beneficial for our users and for society as a whole. Our team is a quickly growing group of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems. About the role Our Inference team is responsible for building and maintaining the critical systems that serve Claude to millions of users worldwide. We bring Claude to life by serving our models via the industry’s largest compute-agnostic inference deployments. We are responsible for the entire stack from intelligent request routing to fleet-wide orchestration across diverse AI accelerators. The team has a dual mandate: maximizing compute efficiency to reliably serve our explosive customer growth, while enabling breakthrough research by giving our scientists the high-performance inference infrastructure they need to develop next-generation models. We tackle complex, distributed systems challenges across multiple accelerator families and emerging AI hardware running in multiple cloud platforms. Inference systems are highly performance sensitive distributed systems. Inference serves hundreds of thousands of customers every day, and the size & span of the inference fleet requires sophisticated routing, scaling, and networking systems. Key responsibilities Design, build, and maintain the distributed systems that serve Claude to millions of users worldwide Develop resilient, flexible systems that adapt in real time to real world events Develop intelligent request routing, load balancing, and traffic management systems across thousands of accelerators Maximize compute efficiency across the fleet by autoscaling and orchestrating production, research, and experimental workloads Build and operate production-grade deployment pipelines for releasing new models to users Provide high-performance inference infrastructure that enables researcher

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Everpure
📍 Ontario• Remote• C$206K – C$329.5K/yr
28 days ago

Everpure (NYSE: P) has evolved from storage pioneer to data platform, closing fiscal 2026 with $3.7 billion in revenue, its first billion-dollar quarter, and accelerating growth into FY27. Our strategic agenda spans the companies defining the next era of technology - hyperscalers, AI labs, the AI hardware supply chain, data platform providers, and the broader AI ecosystem. This type of work—work that changes the world—is what the tech industry was founded on. So, if you're ready to seize the endless opportunities and leave your mark, come join us. The Role The Americas Senior Director, Evergreen Subscription Sales, leads the segment strategy, vision, and execution of the Evergreen subscription portfolio for the Americas Core segment. This role translates global portfolio direction and company objectives into a multi-functional Americas Core segment strategy that increases subscription adoption, recurring revenue, pipeline progression, customer value, and commercial effectiveness. The Senior Director leads the Americas Core Evergreen Subscription Sales organization, develops Americas Core territory and market plans, establishes operating policies and mechanisms, and partners with executive leadership to deliver sustainable business results. The role has broad responsibility and significant operational latitude within the Americas Core segment. It influences strategy, policy, resource allocation, and execution across Sales, Product, Finance, Customer Success, Marketing, Services, and Operations. Account Executives and Regional Sales retain ownership of customer relationships and core account execution; the Senior Director is accountable for the Americas Core Evergreen Subscription Sales function, segment commercial outcomes, organizational capability, and cross-functional alignment. The role does not own or direct Evergreen Subscription Sales execution outside the Americas Core segment. Key Responsibilities Americas Core Segment Strategy, Vision, and Commercial Leader

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B
3 days ago

About Us At BGBx , we're driven by a simple idea: breakthrough thinking creates breakthrough impact. As an independent commercial solutions partner to pharmaceutical and life science companies, we bring together strategists, scientists, communicators, creatives, technologists, and data experts to tackle some of healthcare's most important challenges. Our teams work across consulting and communications to help clients shape strategy, launch innovations, engage stakeholders, and drive meaningful results throughout the product lifecycle. The work is complex, fast-moving, and deeply connected to improving lives, creating opportunities for curious minds to make a real difference every day. If you're energized by collaboration, inspired by innovation, and motivated by work that matters, you'll find a place to grow, contribute, and make a meaningful impact at BGBx. BGB Group Copy Supervisor Position Overview The Copy Supervisor is a senior-level creative department position responsible for providing direct support to the Creative Director, particularly in the areas of creative presentation, client relations, cross-department idea generation, content stewardship, and team creative oversight. The Copy Supervisor must possess superior conceptual skills, knowledge of pharmaceutical requirements/terminology, and great copywriting and management skills. This position typically reports to the Associate Creative Director. Specific Responsibilities: Develops copy, creative concepts, tactics, and ideas Strong idea generator and strong understanding of what makes an idea good Supervises all promotional copy, tactics, and campaigns across all brands Maintains consistency of work, brand guidelines, and strategy Contributes to strategic and tactical planning Key client

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BGBx
📍 Ontario• C$200K – C$240K/yr
7 days ago

About Us At BGBx , we're driven by a simple idea: breakthrough thinking creates breakthrough impact. As an independent commercial solutions partner to pharmaceutical and life science companies, we bring together strategists, scientists, communicators, creatives, technologists, and data experts to tackle some of healthcare's most important challenges. Our teams work across consulting and communications to help clients shape strategy, launch innovations, engage stakeholders, and drive meaningful results throughout the product lifecycle. The work is complex, fast-moving, and deeply connected to improving lives, creating opportunities for curious minds to make a real difference every day. If you're energized by collaboration, inspired by innovation, and motivated by work that matters, you'll find a place to grow, contribute, and make a meaningful impact at BGBx. Position Overview The VP, Engagement Strategy turns brand strategy into connected omnichannel engagement. This senior leader defines how audience insight, behavioral science, content, media, CRM, field engagement, technology, and measurement work together across the customer journey. The VP leads clients and integrated teams from insight through activation and optimization, while helping grow BGBx's Engagement Strategy capability. Key Responsibilities Engagement & Omnichannel Strategy Lead audience-centered, behaviorally informed omnichannel strategies across HCP, patient, caregiver, payer, and other stakeholder audiences Translate brand and business strategy into connected journeys, engagement architectures, channel roles, sequencing, triggers, and activation roadmaps Define how content, media, CRM, field, social, experiential, and digital interactions work together to move audiences toward desired behaviors Make clear strategic choices and tradeoffs that focus investment on the moments and interactions most likel

RS
11 days ago

OUR MISSION At Redwood, we empower our customers with lights-out automation for their mission-critical business processes with industry leading products and platforms developed through an AI-Driven Software Development Life Cycle. ABOUT US Redwood Software is the leading orchestration platform for the autonomous enterprise, driving business transformation at the lowest total cost of ownership. Redwood empowers organizations to intelligently automate and orchestrate mission-critical business and IT processes across complex ERP, hybrid cloud, data and emerging agentic AI systems. Through its SaaS-first automation fabric—with AI embedded across the automation lifecycle—Redwood accelerates the path to autonomous operations. Backed by 30 years of experience and trusted by more than 50% of the Fortune 50, Redwood helps organizations unlock human potential to focus on innovation, growth and what’s next. CORE VALUES One Team. One Redwood Make Your Own Weather Obsess over Customer Success Work the Problem Be Curious Own the Outcome Respect Each Other YOUR IMPACT As a Principal Software Engineer, you will be a senior technical leader and strategic influencer shaping Redwood’s RunMyJobs platform. You will drive high-impact technical decisions, own complex system designs, and lead initiatives that span teams and domains. Your work will translate business needs into scalable, resilient full-stack solutions that meet both functional and non-functional requirements. In this fast-paced, agile environment, you will lead projects from concept through delivery, collaborating closely with product, design, engineering, finance, and customer success teams to ensure alignment and success. You will set the standard for engineering excellence by mentoring engineers at all levels and championing a culture of continuous improvement, innovation, and technical rigor. A key part of this role is to ensure development teams follow best practices, coding standards, and technical requirements.

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RS
25 days ago

Product Owner OUR MISSION At Redwood Software we unleash human potential. We empower our customers with lights-out automation for their mission-critical business processes. Redwood Software is the leader in full stack automation for mission-critical business processes. With the first SaaS-based composable automation platform specifically built for ERP, we believe in the transformative power of automation. Our unparalleled solutions empower organizations to orchestrate, manage and monitor their workflows across any application, service or server – in the cloud or on premise – with confidence and control. CORE VALUES One Team. One Redwood Make Your Own Weather Obsess over Customer Success Work the Problem Be Curious Own the Outcome Respect Each Other YOUR IMPACT In the role of Product Owner for the Internal Product line, you will be responsible for driving development of internal tools, working closely with Product Leader, Consultants, Field Teams, Engineering, and QA. We subscribe to the philosophy that Product Managers and Product Owners are effectively CEOs of their product and drive growth and success of the product with the help of engineering, design, marketing, sales etc. The following attributes are key to excel in this role: Thrive in Ambiguity : POs carve the path and change it early and often as they collect more signals, while separating the noise. Strong Leadership: POs drive the day to day processes in managing the roadmap, driving the daily scrum rituals, and driving features/capabilities to on-time delivery. Strong Execution: This entails leading teams that work with you with fast-paced execution, using user research and business objectives to inform decisions, learning from new information and adjusting accordingly, communicating and managing relationships with stakeholders – both internal (your direct team) and external (senior leaders across the company, for example). Key Responsibilities Help PM leaders define the long term

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Zscaler
📍 Ontario• Remote• C$170.6K – C$243.8K/yr
26 days ago

Zscaler (NASDAQ: ZS) accelerates digital transformation so customers can be more agile, efficient, resilient, and secure. The Zscaler Zero Trust Exchange platform protects thousands of customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location. Distributed across 200+ public data centers globally and thousands of private sites at the edge, the SASE-based Zero Trust Exchange is the world’s largest in-line cloud security platform. We believe the future of work is Human + AI and are building an AI-native enterprise where human potential is amplified by machine intelligence to solve the world’s hardest security challenges. Driven by deep customer obsession, we are committed to the mission, outcome, and to each other. We bring these commitments to life through three core behaviors: ownership and collaboration, trust through outcomes and impact, and a challenge culture with ongoing feedback. Ready to make an impact at the company pioneering security transformation in the AI era? Join us at Zscaler. We are looking for a Manager, Sales Engineering, based in Canada, reporting to our Senior Director, Sales Engineering. You will lead and grow the sales engineering organization for the core portfolio, including the Gen AI market, across the region in the US. You will align closely with GTM Sales Leaders, Product Management, and Engineering to execute strategic solutions and close deals for customers and partners. What you’ll do (Role Expectations) Recruit, mentor, and develop the sales engineering team Refine and scale core sales engineering processes including discovery, technical qualification, and proof-of-concept Partner with sales leadership and clients to design and present business solutions that drive revenue growth Work within a matrixed environment to promote and support the Zscaler portfolio through value-based selling Who You Are (Success Profile) You thrive in ambiguity. You're comfortable building the pa

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Anthropic
📍 Ontario• C$420K – C$495K/yr
1mo ago

About Anthropic Anthropic’s mission is to create reliable, interpretable, and steerable AI systems. We want AI to be safe and beneficial for our users and for society as a whole. Our team is a quickly growing group of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems. About the role As a Sales Lead, Canada Public Sector at Anthropic, you'll drive the adoption of safe, frontier AI across the Canadian public sector. You'll leverage your deep understanding of Canadian government operations and consultative sales expertise to propel revenue growth while becoming a trusted partner to customers, helping them embed and deploy AI while uncovering its full range of capabilities. In collaboration with GTM, product, and marketing teams, you'll help refine our approach to the Canadian public-sector market while maintaining the highest standards of security and compliance. This is a national role anchored in the National Capital Region, supporting the Government of Canada, provincial/territorial governments, Canada's national security and defence community, crown corporations, and the broader public sector. Responsibilities: Drive new business and revenue growth across the Canadian public sector, with the Government of Canada as the primary focus and provincial/territorial governments, crown corporations, and the broader public sector as secondary coverage, owning the full sales cycle from initial outreach through deployment Navigate how the Government of Canada buys cloud and AI services, including software licensing supply arrangements, federal cloud brokering, resale through Canadian partners, consumption via cloud provider marketplaces, competitive tendering, and Indigenous procurement considerations Build and maintain relationships with key decision-makers across the Government of Canada, including departmental Chief Information Officers and Chief Data Officers, senior program executives, central agency an

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Redwood Software
📍 Ontario• Full-time• C$100K – C$125K/yr
2mo ago

OUR MISSION At Redwood, we empower our customers with lights-out automation for their mission-critical business processes. At Redwood, we empower our customers with lights-out automation for their mission-critical business processes. ABOUT US Redwood Software is the leader in full stack automation fabric solutions for mission-critical business processes. Redwood Software is the leading orchestration platform for the autonomous enterprise, driving business transformation at the lowest total cost of ownership. Redwood empowers organizations to intelligently automate and orchestrate mission-critical business and IT processes across complex ERP, hybrid cloud, data and emerging agentic AI systems. Through its SaaS-first automation fabric—with AI embedded across the automation lifecycle—Redwood accelerates the path to autonomous operations. Backed by 30 years of experience and trusted by more than 50% of the Fortune 50, Redwood helps organizations unlock human potential to focus on innovation, growth and what’s next. CORE VALUES One Team. One Redwood Make Your Own Weather Obsess over Customer Success Work the Problem Be Curious Own the Outcome Respect Each Other YOUR IMPACT We are hiring a high-impact Technical Program Manager (TPM) to own end-to-end delivery health within a product area. This is a senior role embedded within a core product engineering group. You will partner with the Engineering Directors as your peer enabling engineering leaders to focus on technical quality while the TPM will own planning, governance, and stakeholder visibility and be the critical link ensuring our roadmap commitments translate into high-quality, enterprise-ready releases. You will operate at the intersection of Product, Engineering, Platform, Support, and Go-To-Market teams, and be directly accountable for delivery predictability, release readiness, dependency management, and executive visibility. This role demands a combination of strategic systems thinking

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Reddit
📍 Ontario• Full-time• Remote
5mo ago

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com . Location: At Reddit we continue to grow our teams with the best talent. We're completely remote friendly . Team Description: The Marketing Science team at Reddit leverages data to maximize the impact of Reddit’s own marketing investments. We serve as the engine behind our growth, using advanced experimentation, causal inference, and econometrics to understand what drives users to Reddit and what brings advertisers to our platform. We work at the intersection of brand building and performance marketing, ensuring every dollar spent is an investment in the long-term health of our ecosystem. Role Description: Reddit is looking for a highly experienced Staff Data Scientist to lead the strategy and technical execution of our Marketing Intelligence efforts. In this role, you will be the primary architect of how we measure and optimize Reddit’s marketing spend. You will focus on two critical flywheels: B2B Marketing (acquiring and retaining advertisers) and B2C Growth (acquiring and engaging new Redditors). This is a high-autonomy, high-impact role where you will set the long-term strategic goals for Reddit’s marketing measurement, influencing senior leadership and defining how we value our brand and performance efforts. Responsibilities: Set Long-Term Marketing Strategy: Define the 2–3 year technical roadmap for marketing measurement. Establish the "North Star" metrics and frameworks that determine how Reddit allocates hundreds of millions in marketing budget. Optimize Marketing ROI: Build and refine Media Mix Models (MM

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Lithic
📍 Ontario• Full-time• From C$158K/yr
6mo ago

Lithic is the modern card issuing and processing platform empowering ambitious financial companies to build the future of payments. Our infrastructure powers card programs for 100+ innovative clients, from fintechs reimagining credit and digital banking to platforms transforming disbursements and spend management. Companies like Mercury, Flex, and Novo rely on Lithic's developer-friendly APIs, direct network connections, and flawless reconciliation to launch and scale card programs in weeks, not years. We're building a future where access to better financial products materially improves people's lives, free from the constraints of 30-year-old mainframes and legacy processors. We're proud to be backed by world-class investors who share that vision, including Bessemer Venture Partners, Index Ventures, Spark Capital, Stripes, and Mastercard, along with many others. We're a team of 170+ across 26 states and 7 countries, headquartered in New York City. We are hiring for our Treasury team Software Engineers at various levels (II and Senior) who are curious and willing to dive deep and understand our technology and domain in order to solve interesting and hard problems.The Treasury team maintains and builds the backend services that manage the flow of funds between Lithic and third parties. This includes our ledger, ACH and wire infrastructure, and associated reconciliation. The systems we maintain have high standards of reliability and correctness. You will become an expert in the card payments space. The Treasury team primarily uses Python for their tech stack. What You'll Do: Ensure high reliability and correctness for Lithic’s ledger and orchestrated funds flows Develop new features to better serve Lithic customers Ensure that the team is delivering reliable, secure, and scalable code with minimal tech debt Own initiatives from planning to launch, keeping stakeholders informed and aligned along the way Lead efforts to improve systems and processes wit

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