Senior Full Stack Developer (React & .NET Core)

Location: Montreal, Canada (Hybrid) Job Type: 12-month contract Experience Level: 7+ years Work Focus: 70% Frontend (React/TypeScript), 30% Backend (.NET Core) Role Overview dyneits is looking for a Senior Full Stack Developer to help advance Capital Markets applications, including IRIS and CurveBuilder. The position centers on frontend work with React and TypeScript, while also involving backend contributions in C# .NET Core. This hybrid role is based in Montreal and involves close collaboration with trading and IT teams worldwide. Main Responsibilities Frontend Development (Primary) Design and build user interfaces using TypeScript and React. Improve and maintain application interfaces for a strong user experience. Apply advanced frontend techniques such as Promises, Redux, and Callbacks. Implement real-time communication with SignalR. Backend Development (Secondary) Develop backend services with C# .NET Core. Support and enhance IRIS backend systems. Create and maintain APIs and business logic. Application and Performance Improvement Work on application performance and scalability enhancements. Contribute to system modernization and evolution. Maintain code quality and efficiency. DevOps and CI/CD Maintain and improve CI/CD pipelines. Work with AWS, Kubernetes, and Git as part of the deployment process. Team Collaboration and Support Work closely with global IT teams and stakeholders to meet project objectives. Support NY USD trading teams, particularly during overlapping time zones. Participate in solution design and technical discussions. Help ensure clear communication across international teams.

JOIN OUR TEAM:At Xsolla, we empower creators with a comprehensive creative suite that enhances their entire content creation experience. Our platform offers monetization and engagement tools, serving as a central hub for creators to earn while promoting publishers’ games. For game publishers, we deliver advanced data reporting and campaign management tools that facilitate data-driven marketing strategies for their latest releases.As a Full Stack Developer, your role will encompass our entire technology stack, from developing dynamic React applications for creators and publishers to managing backend Node.js microservices that process data and power our REST/gRPC APIs. You'll address challenges such as optimizing queries on our extensive creator data database and ensuring our systems can efficiently scale during major game launches.Our team thrives on curiosity, continuous improvement, positive energy, and diverse perspectives. We regularly revisit our decisions to carve out better solutions. We take pride in not just creating exceptional products but also cultivating a company culture that inspires us. Join us to tackle complex problems with a team we deeply respect and enjoy working alongside.

Hello and welcome! Are you searching for an exciting new opportunity, or just exploring the job market? You may have just found the perfect place to elevate your career by joining our innovative team. The Financial Automation team at Lightspeed is dedicated to simplifying merchant operations by transforming tedious manual tasks, such as sales reconciliation, into intelligent, AI-powered automated solutions. We connect complex data with actionable insights, empowering our users to scale their businesses without the need for additional personnel. As a Senior Full Stack Software Developer, you will play a key role in developing and maintaining essential features for our high-stakes financial products. This position emphasizes frontend development, with approximately 70% of your responsibilities focused on frontend tasks, while the remaining 30% will encompass other aspects of our tech stack. You will contribute significantly to our codebase by delivering new features, resolving bugs, enhancing user experiences, and supporting related initiatives. We expect you to bring a wealth of technical knowledge, assist the team in achieving their objectives, evolve our processes and tools, and actively participate in various operational duties, including on-call support. Please note: We welcome applications exclusively from candidates located in Canada.

Join MaintainX, the industry's leading mobile-first workflow management platform designed for industrial and frontline workers. Our innovative, IoT-enabled cloud-based tool optimizes maintenance, safety, and operational processes across equipment and facilities. We empower over 12,000 businesses, including renowned names like Duracell, Univar Solutions Inc., Titan America, McDonald's, Brenntag, Cintas, Michaels, and Shell. Having recently secured $150 million in a Series D funding round, our total funding now stands at $254 million, valuing the company at an impressive $2.5 billion. We're seeking a Full Stack Developer to enhance our teams, with openings at Intermediate, Senior, and Lead levels. What You Will Do: Collaborate with Product Managers and Designers to brainstorm, conceptualize new features, and contribute to product roadmaps. Adopt a product-centric mindset to understand customer needs, business challenges, and the technical landscape within various industries. Technology Stack: You'll work with our comprehensive stack, including TypeScript, React, React Native, Node.js, and GraphQL, focusing on both Web and Mobile platforms. Collaborate with your team to build, maintain, and optimize product features that enhance user collaboration. Take ownership of team features or systems, ensuring their long-term health while improving the overall system quality. Mentor fellow engineers and conduct thorough code reviews. Enhance engineering standards, tooling, and processes to implement best practices in planning, developing, testing, and deploying compliant code. Participate in on-call duties as required. About You: At least 3 years of professional experience in full-stack software development. Proficient in building web and mobile software products, especially using TypeScript, SQL databases, React, and Node.js. Experience in mobile-first, responsive, and iterative web development. Ability to write readable, testable code with a focus on maintainability. Strong communication skills, capable of explaining complex technical concepts to designers, support staff, and other engineers. Proven experience thriving in fast-paced environments. Preferred Qualifications: A degree or diploma in web development, computer science, or a related field. Knowledge of additional technologies and frameworks is a plus.

As a Senior Full Stack Developer, you will play a pivotal role in the analysis, design, implementation, and deployment of product features that enhance and improve MEDFAR's healthcare platform. Your contributions will be essential in delivering secure, scalable, and user-centered solutions that support new clinical workflows and technological innovation.The ideal candidate has experience in developing large-scale web applications, possesses strong leadership and communication skills, and takes a data-driven and rigorous approach to problem-solving. You are comfortable making technical decisions, mentoring your colleagues, and taking initiative to promote high-quality outcomes across the entire stack.Main ResponsibilitiesIn this role, you will be central to building reliable, secure, and scalable web applications. You will engage with both front-end and back-end development while contributing to the improvement of team development standards and practices. Specifically, you will be responsible for:End-to-End Development: Design, develop, and maintain features on both front-end and back-end systems, with a strong focus on performance and user experience;Informed Technology Decisions: Select appropriate tools and frameworks to effectively solve problems, considering long-term maintainability and business impact;Code Quality Advocacy: Write clean, testable, and efficient code, setting an example through rigorous code reviews and sharing best practices;Process Improvement: Continuously seek opportunities to optimize our development processes through automation, tool enhancements, or workflow refinements;Mentorship and Support: Foster the growth of your colleagues through mentorship, technical guidance, and contributing to a culture of collaboration and knowledge sharing;Take ownership of technical challenges and lead initiatives from design through to production deployment. Environment:Backend: .NET / C#, REST APIFrontend: React.JSMobile: React NativeDatabase: SQL Server, SQLDevOps: Azure DevOps, Terraform, PowerShellMonitoring: Elastic searchProject Management: Jira and ConfluenceMethodology: Agile

Join MEDFAR as a Senior Full Stack Developer, where you will be instrumental in analyzing, designing, implementing, and deploying innovative product features that enhance our leading healthcare platform. Your contributions will be vital in delivering secure, scalable, and user-centered solutions that support cutting-edge clinical workflows and technological advancements.We are looking for a candidate with a rich background in developing large-scale web applications, complemented by exceptional leadership and communication skills. A methodical, data-driven approach to problem-solving is essential. You will be empowered to make critical technical decisions, mentor fellow developers, and drive initiatives that result in top-tier outcomes across the technology stack.Main ResponsibilitiesDevelop Comprehensive Solutions: You will design, construct, and maintain features for both front-end and back-end systems, emphasizing performance and user experience.Make Informed Technology Choices: You will select the best tools and frameworks to effectively tackle challenges while considering long-term maintainability and business implications.Promote Code Excellence: You will write clean, testable, and efficient code, leading code reviews and sharing best practices to elevate team standards.Enhance Development Processes: You will actively seek ways to streamline our development workflows, leveraging automation and improved tooling.Mentor and Lead: You will guide your teammates through technical challenges, contribute to a culture of knowledge sharing, and foster collaboration.Take Ownership: You will manage technical challenges and oversee projects from conception to production.Technology Stack:Backend: .NET / C#, API RESTFrontend: React.JSMobile: React NativeDatabase: SQL Server, SQLDevOps: Azure DevOps, Terraform, PowerShellMonitoring: Elastic SearchProject Management: Jira, ConfluenceMethodology: Agile

Join Xsolla, a leading payment solutions provider for the gaming industry, as a Full Stack Engineer specializing in React and Node.js. In this role, you will be responsible for designing, developing, and maintaining web applications that enhance the gaming experience for players worldwide.Your expertise in both front-end and back-end development will help us build robust, scalable, and interactive applications. Collaborate with cross-functional teams to create innovative solutions and ensure high-quality code that meets our standards.

About ValPayValPay is an innovative embedded payment solution designed to streamline the onboarding of merchants, facilitate transaction processing, and enhance revenue optimization. Our unique PayFac-as-a-Service model provides all the advantages of integrated payments without the complexities of underwriting, compliance, and regulatory requirements typically associated with being a Payment Facilitator (PayFac).About the RoleWe are seeking a talented Senior Full-Stack Developer with over 5 years of professional experience and a strong enthusiasm for application development to join our agile engineering team in a fast-paced startup setting. In this pivotal role, you will play a key part in designing, optimizing, and scaling essential features across our payment systems, engaging in both front-end and back-end development. You will collaborate closely with product, design, and support teams, contribute to architectural decisions, resolve bugs, and produce high-quality production-level code that significantly impacts our clients.Key ResponsibilitiesCreate, develop, and maintain scalable full-stack applications supporting ValPay’s embedded payments platform.Design and enhance APIs, backend services, and frontend interfaces used by SaaS partners and internal stakeholders.Collaborate with Product, Customer Support, and Customer Success teams to transform requirements into effective technical solutions.Integrate third-party services using APIs and payment infrastructure.Contribute to architectural and data strategy as our platform evolves.Identify and resolve performance issues, ensuring system reliability and efficiency.Uphold high standards of security and performance in a regulated payments environment.Participate in code reviews and mentor junior developers.Document technical processes and data flows clearly and thoroughly.Utilize AI tools and workflows to enhance development productivity.Share insights and lessons learned with team members.

About Stay22At Stay22, we are transforming the way people convert online. Our AI-powered affiliate platform empowers publishers, ticketing platforms, and content creators to unlock new revenue streams while enhancing their audience's user experience. Our partners don’t just earn more; they provide more. Join us in making a significant impact in the world of affiliate marketing.About the PositionAs a Senior Full-Stack Developer on the Phantom team, you will play a pivotal role in developing our integrated widget and affiliate platform. You will optimize browser-side script execution to ensure high performance across various sites, while designing privacy-respecting session tracking and fingerprinting mechanisms. You will oversee the entire script lifecycle, from load optimization to event management and error recovery, contributing to the infrastructure that powers Stay22's embeddable products.Key ResponsibilitiesContinuously optimize load times and script execution efficiency (minification, caching, lazy loading).Develop reliable methods for injecting content and widgets across different sites (DOM, dynamic layouts).Implement precise event handlers to track user interactions with embedded elements.Utilize fingerprinting techniques to track user sessions while ensuring privacy compliance.Create and maintain Node.js/Python scrapers for data collection from partner sites or APIs, with failover sources to ensure resilience.Troubleshoot and adapt script logic for real-world conditions and manage conflicts with third-party scripts.Oversee the entire stack of integrated products (scripts, SDK, API) and collaborate with teams to implement new features.

Opportunity We are seeking a talented Senior Full-Stack Developer to lead the next generation of advertising experiences within the Ad Unit team. The successful candidate will drive innovation in ad units—from dynamic displays to interactive endcards and new advertising journeys that enhance user experiences and optimize monetization revenue. This role blends concrete technical design with strategic leadership. You will work across Android, iOS, WebView, and backend services to design, experiment, and scale advertising formats delivered to billions of devices worldwide. If you enjoy working at the intersection of front-end performance, creative experimentation, and full-stack system design, this is your chance to shape how millions of users engage with ads via Unity. Your Responsibilities Design and implement innovative ad unit formats and journeys—including dynamic displays, interactive components, and seamless integrated advertising experiences. Rapidly prototype and experiment, collaborating with PMs, BI, and Data Science to validate hypotheses and measure impact through A/B testing. Design and deliver full-stack solutions linking SDK surfaces to backend services for ad delivery and configuration. Define and drive the innovation roadmap for ad formats—identifying opportunities, setting technical direction, and quantifying business impact. Mentor and support developers on Android, iOS, and WebView platforms, fostering best development practices and a culture of experimentation. Collaborate with backend and Gateway teams to enhance ad rendering pipelines, caching strategies, and performance throughout the lifecycle. Assume responsibility for feature metrics such as load time, display rate, CTR, and revenue growth, ensuring performance post-deployments. Contribute to the architecture of the Bold SDK, helping to establish a modular and extensible foundation for future innovations in ad formats.

Join us in revolutionizing how businesses utilize AI technology.In the forthcoming decade, autonomous agents will transform the landscape of our work environments.At Botpress, we empower companies to create and implement sophisticated AI agents that transcend mere conversation and engage in complex business logic.Our product is operational today, scalable across various industries, regions, and countless applications.Recognized as the 3rd fastest-growing B2B AI startup globally, we are leading the charge in the AI revolution, offering the most utilized platform for advanced AI agents.The journey ahead is ambitious, and the opportunity is exceptional. We adopt a strategic approach to growth: product-led, capital-efficient, and intensely focused.If you aspire to develop foundational technology for one of the most significant transitions in software, we invite you to apply.

Join MaintainX, the leading mobile platform for procedure management tailored for industrial workers and frontline personnel. We are building the GitHub for real work procedures such as maintenance, safety, and operations, enhancing operational efficiency for over 12,000 companies including Duracell, Univar Solutions Inc., Titan America, McDonald's, Brenntag, Cintas, Michaels, and Shell. Recently, we secured a Series D funding of $150 million, bringing our total funding to $254 million and valuing the company at $2.5 billion. We are seeking a Full-Stack Developer to join our dynamic teams. Positions are available for intermediate, senior, and lead roles. Your Responsibilities: Collaborate with Product Managers and Designers to conceptualize new features and contribute to product roadmaps. Adopt a product mindset to understand customer activities, needs, and technical opportunities and challenges within their industries. You will work across our entire stack (TypeScript, React, React Native, Node.js, and GraphQL) for both Web and Mobile applications. Work with the team to build, maintain, and optimize product features that enhance user collaboration. Take ownership of features or systems within the team, ensuring their long-term health and the improvement of surrounding systems. Mentor other engineers and conduct thorough code reviews. Enhance engineering standards, tools, and processes, and implement industry-compliant best practices in planning, development, testing, and deployment. Be available on-call. Your Profile: Minimum 3 years of professional experience in full-stack software development, with a background in building web and mobile-based software products, particularly with TypeScript, SQL databases, React, and Node.js. Experience in iterative web development and mobile-first responsive design. Ability to write clear and maintainable code.

Join mila-2 as a Full Stack Software Developer focused on combating misinformation. In this critical role, you will leverage your technical skills to develop innovative solutions that enhance the accuracy and reliability of information online. Collaborate with a talented team dedicated to making a meaningful impact in the digital landscape.

Role overview medfar is looking for a Senior Full Stack Developer to shape and enhance technology products in the healthcare field. This position centers on building applications that improve patient experiences and help healthcare professionals work more effectively. What you will do Design and develop software applications tailored for healthcare needs Collaborate with fellow developers and team members to deliver practical solutions Apply modern technologies to make healthcare processes more efficient Location This role is based in Montreal.

About Us:At AssistIQ, we are committed to revolutionizing the healthcare supply chain by empowering providers with the ability to generate precise data and insights regarding their supply usage. Our innovative AI-powered software solution ensures seamless tracking, real-time visibility, and actionable insights for healthcare systems, ultimately promoting waste reduction and enhancing revenue capture, leading to improved patient care and outcomes.About the Role:As a Full Stack Software Engineer, you will play a pivotal role in designing, developing, and managing the cloud-based services and web applications that drive the AssistIQ platform.We are looking for candidates who thrive in a fast-paced, entrepreneurial environment. Your primary objective will be to ensure the development of new functionalities in a practical, scalable, and maintainable manner.Success in this role requires the ability to manage multiple responsibilities simultaneously, prioritize competing deliverables effectively, communicate clearly across the organization, and maintain a focus on continuous incremental improvement.We expect you to be knowledgeable, articulate, and sensible, capable of coordinating with peers and senior executives, while collaborating to deliver results in a dynamic environment where teamwork, professionalism, confidentiality, and communication are paramount.Your Responsibilities:Design, develop, and enhance new functionalities of the AssistIQ platformOptimize the deployment process and ensure adherence to automation and continuous integration best practicesSupport the production infrastructure and our product for customersAssist internal customer support and implementation teamsDevelop internal tools to enhance our deployment, management, and monitoring capabilitiesProvide technical and analytical guidance to fellow development team membersContribute to the writing and maintenance of technical documentationEngage in planning product features and development projectsParticipate in our Agile development process and ceremonies

Mandatory Residency in Greater Montreal.This is a hybrid position requiring in-office presence for the initial three months, transitioning to a flexible arrangement with 3 to 4 days in the office thereafter.As a part of the XTM portfolio, Consoltec specializes in developing the innovative FlowFit application, designed specifically for translation companies and linguistic services.At XTM Group, we are committed to providing state-of-the-art solutions in translation management, empowering enterprises to efficiently access global markets through our industry-leading platform that automates and manages every aspect of the localization process.Our workplace culture is grounded in collaboration and a shared passion for language technology, fostering an inclusive environment where every employee feels valued and can contribute meaningfully. Our core values guide our actions, helping us strive towards our vision of becoming the top Translation Management System for enterprises.We are currently in search of an Intermediate/Senior Full Stack Developer specializing in .NET C# to join our dynamic team at our Montreal office located in the Angus Technopole district.If you are a dynamic, creative individual eager to tackle challenges, we want you on our team! As a lead .NET C# Full Stack Developer, you will play a crucial role in the development and implementation of our FlowFit solution, actively participating in the design and analysis of our clients’ unique needs.Join our team to:Contribute to significant projects for international clientsCollaborate with a talented team in a supportive environmentThrive in an agile work settingKey Responsibilities:Engage in the development of our FlowFit solutionDesign and develop user interfacesImplement proactive monitoring and suggest enhancements

Join our dynamic team at 360IT Professionals as an Intermediate Full Stack Web Developer. In this role, you will have the opportunity to work on innovative projects that challenge your skills and enhance your professional growth. You will collaborate with cross-functional teams to design and implement robust web applications, ensuring a seamless user experience.

Join our dynamic team at info-ways as an Angular JS Developer. In this role, you will be responsible for building and maintaining efficient, reusable, and reliable Angular JS applications. We are looking for a skilled developer who is passionate about web technologies and thrives in a fast-paced environment.

Location: US or CanadaType: US Applicants - Full-Time; Canadian Applicants - Independent ContractorAbout Human AgencyAt Human Agency, we are experiencing rapid growth and are looking for exceptional talent across various disciplines to join our innovative team. Our mission is to attract diverse individuals, from creative producers to technical experts and entrepreneurial leaders, who can help us navigate this exciting chapter of growth.We pride ourselves on being a company of doers. Our leaders are hands-on, teams collaborate openly, and every member contributes to our projects. We welcome feedback, learn swiftly, and continuously strive for excellence. Here, the best ideas prevail, regardless of their origin, as our clients rely on us to deliver outstanding results every time.Our clients’ missions, products, and bottom lines are of utmost importance to us. We immerse ourselves in their vision, acting as partners in tackling significant challenges. Every product, strategy, or asset we develop must be not only aesthetically pleasing but also functional, practical, and designed for real-world impact.We believe that our people are our greatest asset and we grow by hiring those who elevate our capabilities. Across strategy, engineering, design, data, and operations, we seek teammates who inspire us to reach new heights. Always hire up, never down.We collaborate with organizations of all sizes to explore, design, and implement secure, scalable, and human-centered AI strategies. Our conviction is that AI should enhance human potential, not replace it. We build this philosophy into every engagement, from advisory and tooling to implementation and education, meeting clients where they are and helping them integrate AI in ways that align with their mission and values. Our aim is to empower teams to work smarter, move faster, and unlock new possibilities through thoughtful, responsible innovation.Above all, we lead with purpose, love, and a sense of adventure. We engage in meaningful work with people we care about, making the journey an adventure worth undertaking. At Human Agency, our identity and our work approach are one and the same.The OpportunityAs a Senior Full-Stack Engineer at Human Agency, you will be at the forefront of shaping the future by integrating cutting-edge AI solutions with intuitive software development. We specialize in building scalable and secure SaaS applications that empower enterprise clients to efficiently solve complex challenges. Join our team and work on high-impact projects at the intersection of AI, machine learning, and secure software engineering.

Medfar is looking for a Senior Full Stack Developer to join the team in Montreal. This role centers on building and maintaining software that helps clinics and care providers deliver better patient care. The focus is on SaaS products tailored for the healthcare industry. Role overview This position involves designing, developing, and supporting solutions that streamline healthcare operations. The work directly impacts how clinics manage their workflows and how patients receive care. What you will do Develop and maintain features across the full stack for Medfar’s healthcare SaaS platform Work closely with colleagues to deliver reliable and scalable software Contribute to projects that improve clinic operations and patient outcomes Location This position is based in Montreal.