Senior Backend Engineer - Distributed Systems at Movable Ink | Toronto

About HTS MediaHTS Media serves as Hopper's dynamic advertising and media division, dedicated to facilitating connections between travel brands, suppliers, and travelers on a grand scale. We amplify advertising placements across Hopper's mobile application and through our extensive B2B partnerships, which feature renowned companies such as Capital One Travel and TripAdvisor. Our ambition is to establish the leading retail media network within the travel industry, transforming advertising into a significant profitability engine for Hopper and our collaborators, similar to the success seen by entities like Instacart, Uber, and Amazon.Although we are in the formative phases of our roadmap, HTS Media has swiftly emerged as one of Hopper's most rapidly expanding and profitable business units. The engineering team plays a crucial role in the scaling of our platform, ensuring that our ad tech solutions yield quantifiable results for advertisers while providing seamless experiences for travelers.About the RoleAs a Senior Backend Engineer on the HTS Media team, you will be instrumental in developing the engine that fuels our advertising ecosystem. Your primary responsibilities will include designing, constructing, and optimizing high-throughput, low-latency services that manage ad requests, conduct auctions, and deliver millions of pertinent offers to travelers in real time. This is a pivotal role where your contributions will directly influence platform performance, the success of advertisers, and Hopper's financial outcomes.You will confront intricate challenges inherent to the ad tech sector, from enhancing our real-time bidding (RTB) algorithms to guaranteeing millisecond response times even under substantial loads. As a technical leader, you will mentor fellow engineers, guide architectural decisions, and uphold the standards for producing high-quality, scalable code. If you are enthusiastic about architecting distributed systems that function at an extensive scale, this is the ideal opportunity for you.

About HTS MediaHTS Media is the advertising and media division of Hopper, dedicated to connecting travel brands, destinations, and suppliers with travelers at scale. Our platform facilitates advertising placements across Hopper’s app and through our extensive B2B partner network, which includes prominent brands such as Capital One Travel and TripAdvisor. Our objective is to establish the travel industry’s premier retail media network, transforming advertising into a significant profitability driver for Hopper and our partners, similar to the successes achieved by Instacart, Uber, and Amazon in their respective markets.Though we are in the early phases of our growth, HTS Media has rapidly emerged as one of Hopper’s fastest-growing and most lucrative business units. The engineering team plays a crucial role in expanding the platform, ensuring our ad tech solutions deliver measurable results for advertisers while providing seamless experiences for travelers.About the RoleAs a Senior Full-Stack Engineer on the HTS Media team, you will be instrumental in driving innovation for our advertising products. Your primary focus will be to design and test new ad experiences, taking ownership of the technologies that deliver these features to travelers across the web. You will leverage Hopper's own website as a testing ground, swiftly implementing and refining new ad formats and features to validate their effectiveness.Your expertise will also extend to packaging these successful innovations for our B2B partners by creating user-facing ad products, contributing to our JavaScript SDK, and developing the robust APIs that support our operations. This position calls for a product-oriented engineer who is enthusiastic about crafting seamless user experiences and is adept at working across the complete technology stack—from client-side rendering to backend API logic.

NimbleRx is a pioneering healthtech company dedicated to transforming the way individuals access, understand, and manage their healthcare. Our journey begins with the ambition to create the world's most beloved pharmacy business. As a rapidly expanding, tech-centric startup, we are committed to enhancing the experiences of both patients and pharmacists. At Nimble, we cultivate a collaborative culture that encourages open communication and purposeful action, empowering us to tackle today's most exciting challenges and achieve rapid growth.* Please note: Sponsorship options are limited as Nimble does not have an entity established in Canada.As a Senior Backend Engineer, you will play a crucial role in designing the technology and customer experiences that are essential to our various web products serving patients, pharmacies, and other clients of NimbleRx (www.nimblerx.com). You will collaborate with a team of exceptional and driven software engineers who prioritize performance, reliability, and scalability in their work. Your contributions will involve close cooperation with other developers, product management, and design teams to define feature requirements and technical use cases, ensuring timely delivery of high-quality code.Our engineering culture: We embrace a philosophy of shared trust and humility, fostering a sense of unity as we collaboratively navigate the challenges of a fast-growing business. Our daily operations reflect our core values of empathy, simplicity, autonomy, leadership, ownership, curiosity, a bias for action, and mentorship, all within a highly cooperative environment.

About FeatheryFeathery revolutionizes data intake workflows for insurance and wealth management firms. Industry leaders depend on Feathery to streamline crucial operations such as underwriting, client onboarding, and automated account openings.With significant revenue growth and increasing demand from enterprises, we are expanding our engineering team to handle progressively intricate, data-driven workflows across our platform.Why We’re HiringAs Feathery continues to grow, so does the complexity and scale of the systems that support our product—ranging from document processing pipelines to real-time workflow execution.We are seeking a Senior Backend Engineer to assist in constructing and scaling the foundational infrastructure behind our document intelligence and workflow platform. This role is perfect for someone who enjoys designing reliable, high-performance systems and taking charge of backend architecture in a rapidly growing B2B SaaS environment.You will collaborate closely with product, engineering, and customer-facing teams to deliver systems that are swift, resilient, and finely tuned to customer requirements.About the RoleThis is a high-ownership role that encompasses:Backend system design and distributed architectureInfrastructure, scalability, and performance optimizationProduct-focused engineering and problem-solvingCross-functional collaboration across product and customer teamsYou will play a pivotal role in shaping the systems that drive Feathery’s platform—ensuring they are reliable, scalable, and capable of managing complex, real-world applications.What You’ll DoBackend Systems & InfrastructureDesign, build, and scale backend services that facilitate document processing and workflow automationDevelop asynchronous pipelines and distributed systems for managing large data volumesConstruct and maintain infrastructure utilizing AWS services and queuing systems (e.g., SQS)Guarantee high availability, fault tolerance, and observability across systemsOptimize systems for performance, scalability, and cost-efficiencyData Processing & Platform CapabilitiesEstablish systems for processing and transforming both structured and unstructured dataIntegrate data sources and ensure seamless data flow

Role Overview Venn is hiring a Senior Backend Engineer in Toronto. This role focuses on designing and improving backend architecture to support reliable, scalable applications. The position involves close collaboration with colleagues from various teams to deliver solid software that supports business goals.

About the TeamThe Customer Experience (CX) Product team is responsible for overseeing the entire post-booking journey. This includes managing changes, disruptions, refunds, and customer support interactions from the moment a trip is booked.We develop and maintain high-quality systems that facilitate rapid and efficient customer support on a large scale, such as:Customer self-service experiences within the Hopper app and integrated flows with partners.Internal agent platforms that enable efficient and high-quality resolutions by human agents.HTS Assist, Hopper’s premier AI platform, utilized internally and offered as a B2B solution to global travel partners.Together, these platforms serve millions of travelers through chat, voice, web, and third-party channels, enhancing the post-booking experience globally.About the RoleAs a Senior Software Engineer on the CX Platform team, you will be instrumental in designing, building, and evolving the foundational systems that power Hopper’s post-booking operations. Your contributions will have a direct impact on customer interactions, support agents, and the ongoing growth of HTS Assist in AI-driven voice and chat applications.You will collaborate closely with Product, Design, AI, Data, and Operations teams to create intelligent and scalable customer service systems, including conversational AI workflows, self-service customer journeys, and internal tools utilized by thousands of agents. You will also help develop infrastructure that supports partner-specific experiences.Reporting to a Senior Engineering Manager, you will work alongside engineers focused on platform services, integrations, AI orchestration, and self-service user experience.Day-to-Day ResponsibilitiesDesign, build, and enhance backend and/or full-stack systems that support HTS Assist, internal agent tools, and customer self-service flows.Create scalable APIs, microservices, and orchestration logic that facilitate complex post-booking journeys across AI, chat, voice, and web platforms.Collaborate with product, design, AI, and operations teams to implement features that improve customer experiences and boost agent productivity.Integrate with external systems such as telephony, CRM, identity, or booking platforms to support both internal and partner use cases.Take ownership of features from technical design through implementation, testing, deployment, monitoring, and iteration.

Join our dynamic team at shyftlabs as a Senior Backend Developer. In this pivotal role, you will be responsible for building and maintaining robust server-side applications that power our innovative solutions. You will work closely with cross-functional teams to deliver high-quality software that meets our business needs.Your expertise in backend technologies will be crucial in optimizing our systems and ensuring scalability. If you are passionate about technology and eager to contribute to exciting projects, we would love to hear from you!

About BreeBree is transforming the consumer finance landscape by providing innovative, efficient, and cost-effective financial services to over half the Canadian population living paycheck to paycheck. Operating within a vast yet underrepresented market, we aim to be the most affordable and reliable provider of short-term credit for the 20 million Canadians facing financial challenges.With over 600,000 Canadians already benefiting from Bree's services, we are just beginning our journey. Our company is experiencing rapid growth, achieving product-market fit, and is positioned to become a leading FinTech player in Canada. With annualized revenues in the eight-figure range, we are on a double-digit growth trajectory, maintaining profitability and an impressive employee retention rate. As a proud participant of Y Combinator in 2021, we successfully secured a $2 million seed funding shortly thereafter.About the RoleWe are seeking a talented Backend Software Engineer to lead the architectural development of our serverless infrastructure, utilizing the latest AI development tools. The ideal candidate will possess extensive backend experience, a dedication to creating clean and maintainable systems, and an innovative mindset towards AI-assisted development.What You'll DoArchitect and advance our serverless backend systems with an emphasis on scalability, maintainability, and enhancing the developer experience.Refactor and modernize our existing Lambda-based microservices architecture to implement patterns that optimize AI tool effectiveness.Create and maintain robust data pipelines and payment processing systems across various providers.Promote best practices in AI-native development, establishing patterns and abstractions that foster rapid iteration with tools such as Cursor and Claude Code.Collaborate with infrastructure engineers to refine our AWS-based architecture using Infrastructure as Code.Drive the consolidation and standardization of our data layer across Supabase, Firebase, and legacy systems.What You'll NeedExpert-level proficiency in TypeScript, Node.js, and AWS services.Demonstrated experience with serverless architectures and microservices.Strong understanding of database systems and data modeling.Familiarity with AI development tools and methodologies.Excellent problem-solving skills and a proactive approach to development challenges.

Join Opendoor as a Software Engineer specializing in Backend Pricing, where you will play a pivotal role in shaping the future of real estate technology.As part of our dynamic team, you will develop innovative back-end solutions that enhance pricing algorithms, ensuring optimal performance and delivering a seamless user experience.

Join Stripe as a Backend/API Engineer specializing in Billing, where you will play a crucial role in enhancing our platform's capabilities. You will be responsible for designing and developing RESTful APIs that integrate seamlessly with various services, ensuring robust performance and scalability. Collaborate with cross-functional teams to create innovative solutions that enhance user experience and drive business growth.

Marqeta is seeking skilled Senior Backend Software Engineers to become part of our dynamic Engineering team. In this role, you will develop high-performance software that supports Marqeta's backend services. Your responsibilities will include creating and reviewing engineering design documentation, enhancing our systems, infrastructure, and processes, developing new features, conducting code reviews, and collaborating with a diverse group of stakeholders across the organization. As a Backend Engineer, you will deliver meaningful products that contribute to Marqeta's position as a leader in modern card issuing. You'll have the opportunity to innovate on system architecture, produce impactful software, and mentor junior engineers. Participation in a rotational on-call pager duty is a required aspect of this role, with specifics varying by team. This will be discussed further during the interview process. We embrace a Flexible First approach, allowing this role to be performed remotely from anywhere within Ontario or British Columbia, Canada. We would love for you to join our team! This posting is for multiple Senior Software Engineering positions across Marqeta.

Okta builds secure identity solutions for both people and AI, providing trusted infrastructure that helps organizations manage access in a complex technology landscape. The company’s mission centers on delivering secure, reliable access for everyone. The Privileged Access Management (PAM) team at Okta uses an identity-first approach to tackle privileged access challenges. By applying Zero Trust principles designed for cloud environments, the team enables organizations to control access to sensitive servers, databases, and cloud resources. Their work ensures that only authorized users and systems can reach critical assets when needed. Role overview This Staff Backend Engineer position focuses on distributed systems and core software infrastructure. The role involves deploying code that safeguards real-world infrastructure for Okta’s customers. Contributions in this role support several feature teams and influence the speed, reliability, and usability of the product. Success in this position requires a strong understanding of how systems connect, an appreciation for solid abstraction, and the ability to adapt those abstractions as products change. What you will do Advance the core architecture of Okta’s PAM platform. Collaborate with product development teams to build scalable, modular components. Design and implement scalable architecture patterns. Develop APIs using the OpenAPI Specification to enable customer access to production infrastructure. Work with backend systems written in Go. Participate in rotational on-call duties alongside SRE and product development teams. Location This role is based in Toronto, Ontario, Canada.

Join Justworks as a Senior Backend Software Engineer and play a pivotal role in shaping our technology landscape. You will work on high-impact projects, designing and implementing scalable backend systems that support our mission of simplifying business operations for our clients. Your expertise in backend technologies will be critical in delivering exceptional digital experiences.

Join Centari as a Senior Backend Software Engineer!At Centari, we revolutionize high-stakes dealmaking by unlocking the power of private deal data. Our innovative deal intelligence platform is paving the way for a new era in law and finance, transcending mere automation to embrace data-driven decision-making. Our proprietary Deal Reasoning Engine converts complex documents into actionable insights, equipping global deal teams with the knowledge needed to negotiate effectively.We foster a diverse team of attorneys, financial experts, and engineers within a hybrid, cross-cultural environment. Our mission is supported by esteemed enterprise AI investors, including GTMfund and industry veterans such as Jeremy Kranz and Andy Appelbaum.We thrive on complexity as it breeds innovation. If you're a proactive builder who excels in ambiguous situations and embraces radical ownership, we want to connect with you!For more details, visit centari.com or follow us on LinkedIn.

About Equitable Bank Equitable Bank, recognized as Canada's Challenger Bank™, serves over 800,000 customers nationwide. With more than $142 billion in assets under management and a wholly owned subsidiary (Concentra Bank) supporting credit unions and their six million members, the organization has spent 50 years pushing for change in Canadian banking. The EQ Bank digital platform has earned recognition from Forbes as one of the top banks in Canada since 2021. Role Overview: Senior Backend Engineer Based in Toronto, the Senior Backend Engineer will join the Fraud Engineering team at EQ Bank. This group builds and maintains the infrastructure that protects customer interactions, including onboarding, transactions, account changes, and fund transfers. The focus is on developing transparent, reliable, and responsible systems that keep customers safe without sacrificing agility. What You Will Do Design, build, and maintain backend services that support fraud prevention and detection across the bank's digital platforms. Take full ownership of services, from initial design through deployment and ongoing support. Develop systems that are observable and explainable in runtime, making it easier to monitor and understand behavior. Implement clear service ownership and well-defined, testable contracts between systems. Ensure new protections are introduced in a safe and predictable way, especially as system complexity grows. What We Value Curiosity about system behavior, especially in risk, failure, and edge-case scenarios. Commitment to building reliable and transparent backend solutions. Comfort with taking end-to-end responsibility for services. Desire to work in a team that challenges traditional banking norms and seeks creative solutions. Location This position is based in Toronto.

ShyftLabs delivers data-driven digital products for Fortune 500 clients, working across industries to create measurable business results. Since 2020, the company has grown teams in Canada, the U.S., and India, and values people who turn ambitious ideas into practical solutions. Role overview The Senior AI Engineer position is based in Toronto and focuses on building and deploying AI-powered features in production environments. This is a hands-on engineering role, working closely with Product, Architecture, and other engineering teams to deliver intelligent capabilities for ShyftLabs’ data-centric platforms. The role also involves contributing to the backend infrastructure that supports these products, with an emphasis on scalability and reliability. What you will do Design, build, and deploy AI and machine learning features directly into production systems Work with cross-functional teams to integrate intelligent functionality into new platforms Help develop backend platforms, focusing on scalability and resilience Requirements Significant experience in AI or machine learning engineering Strong skills in backend development Experience with fine-tuning large language model integrations Ability to design resilient APIs or event-driven services

Achievers is looking for a Senior Backend Software Engineer to join the Data Intelligence team in Toronto. This role centers on building and maintaining backend services that transform data from our SaaS platform into actionable insights for clients. Role overview As part of the team, you will design and develop backend systems using Python and Go. Our services run on a microservices architecture, deployed with Google Cloud Platform and Kubernetes. The focus is on delivering intelligent, high-impact solutions that help organizations use their data more effectively. What you will do Develop and maintain backend services that process and analyze platform data Work with Python and Go in a microservices environment Deploy and manage services on GCP and Kubernetes Help create seamless and valuable user experiences by solving engineering challenges at scale Requirements Experience with backend development using Python and/or Go Familiarity with microservices architecture Experience deploying services on Google Cloud Platform and Kubernetes Strong problem-solving skills and ability to work on large-scale systems Note: This position is focused on backend engineering, not data engineering.

PENN Entertainment, Inc. stands as North America’s foremost provider of integrated entertainment, sports content, and casino gaming experiences. We deliver diverse experiences from casinos and racetracks to online gaming, sports betting, and entertainment content, ensuring our offerings meet the desires of our audience—how and where they want them.We are continuously seeking individuals who are passionate about building and delivering innovative online gaming and sports media products. Whether through Hollywood Casino, theScore Bet Sportsbook, or theScore media app, we are eager to challenge the boundaries of possibility. Our state-of-the-art platforms are fueled by proprietary in-house technology, a core element of PENN’s omnichannel gaming and entertainment strategy.By joining PENN Entertainment’s digital team, you will work on these innovative platforms such as theScore and PENN Interactive, while also being part of a company dedicated to your professional growth. We are committed to helping you enhance your skills and explore new opportunities.With numerous locations across North America, you have the chance to build a future with PENN Entertainment, no matter where you are. If you are interested in redefining the gaming, media, and entertainment landscape, we want to hear from you.

About the Team The Production Scheduling Technology team is at the forefront of automating and optimizing how HelloFresh orchestrates its meal production processes. We have successfully launched a next-generation internal system that automates the entire planning workflow, significantly impacting how millions of meals are distributed throughout our network. As we enhance this system and prepare for future growth, we are seeking a Senior Backend Engineer with robust backend expertise, a knack for transforming intricate logic into effective and dependable systems, and a moderate understanding of full-stack development to support our internal applications. We prioritize candidates who can contribute to our mission at HelloFresh. We value diverse experiences and believe that anyone can excel in this role, so we encourage you to apply even if you don't meet every single requirement. Responsibilities Develop, enhance, and share ownership of a Python-based algorithmic engine that fuels automated planning, incorporating deterministic logic and constraint-based components. Create, develop, and sustain backend services utilizing FastAPI, ensuring scalable and reliable API interactions with our internal applications. Engage in the complete technology lifecycle, including architecture, implementation, deployment, and operations within our advanced tech stack (EKS, RDS, S3, ElastiCache, Glue, etc.). Collaborate with engineers, analysts, and planners to translate domain insights into robust and maintainable system logic. Advance the platform towards an event-driven architecture using technologies such as Kafka. Assist with frontend requirements for our internal React application, ensuring seamless integration between frontend and backend systems. Enhance system reliability through automated testing, performance optimization, and thoughtful design principles. Foster a culture of knowledge sharing and collective ownership through pairing, design discussions, and collaborative learning. Contribute to the strategic direction of an innovative system. Qualifications Proven experience in backend development, particularly with Python and FastAPI. Strong understanding of API design and microservices architecture. Experience with event-driven systems and related technologies (e.g., Kafka). Familiarity with cloud services and infrastructure (AWS, EKS, RDS). Ability to work collaboratively in a team-oriented environment. Excellent problem-solving skills and attention to detail. A proactive attitude towards learning and sharing knowledge.