Senior Full Stack Software Developer (React.js)

Hello! Thank you for stopping by 👋Are you actively seeking a new opportunity or just exploring the market? If so, you may be in the right place to join our team.The Financial Automation team at Lightspeed is dedicated to simplifying merchant operations by replacing tedious manual processes, such as sales reconciliation, with intelligent automated systems po…

At Tecsys, we embrace the benefits of a remote-first work culture, enhancing employee morale, productivity, and minimizing commuting impacts on well-being and the environment. Our commitment to a digital-first approach is supported by advanced technologies and programs that foster a collaborative and engaging work environment. Our team enjoys the flexibility to work in a way that maximizes their productivity, whether from the comfort of home or in our conveniently located offices.About UsTecsys is a dynamic and fast-growing innovator providing cutting-edge supply chain solutions to leading healthcare systems, hospitals, pharmacies, distributors, retailers, and 3PLs. Partnering with industry leaders, we leverage technology to revolutionize supply chains. If you are eager to tackle exciting challenges and pursue continuous learning, Tecsys may be the ideal place for you!Our Product & Technology team utilizes Operations Research alongside AI and ML technologies to create next-generation supply chain solutions. We maintain a practical approach to applying AI in addressing tangible challenges in warehousing, distribution, transportation, and supply chain management. We are currently seeking a Senior AI/ML Developer to drive forward our AI, ML, Data Science, and Operations Research initiatives, delivering actionable business insights for various supply chain applications.Your RoleAs our resident AI expert, you will collaborate closely with development teams to lead the creation of innovative features, providing actionable insights to our customers and end-users, enabling them to manage their operations efficiently. You will spearhead the identification, coordination, and development of Data Science solutions to construct predictive and prescriptive models, as well as design AI/ML solutions that utilize data pipelines to effectively tackle supply chain problems. Furthermore, you will contribute to the design and development of robust, production-grade AI systems, including LLM-powered features, retrieval-augmented generation (RAG) pipelines, and multi-step agent workflows. Your efforts will help transform experimental AI capabilities into reliable, scalable, and measurable product features.While managing the end-to-end cycles of solutions is not your primary responsibility, your support in this process—particularly in developing tools to evaluate model efficacy—will be invaluable.

Role overview The Senior Data Transfer Developer at Medfar works on building and implementing data transfer solutions that support healthcare technology in Montreal. The focus is on systems that help ensure patient care remains accurate and efficient. Every project in this role has a direct impact on how healthcare data is handled and moved. What you will do Develop and maintain data transfer systems tailored for healthcare applications Integrate data solutions across different platforms by working with cross-functional teams Support consistent, reliable, and accurate data flow throughout Medfar’s technology suite Collaboration This position requires regular collaboration with colleagues from several departments. The goal is to make sure data moves smoothly and securely between systems, supporting the broader healthcare mission at Medfar.

About Stay22At Stay22, we are redefining how individuals convert online. Our AI-powered affiliate platform empowers publishers, ticketing platforms, and content creators to unlock new revenue streams while enhancing user experience for their audiences. At Stay22, our partners don't just earn more; they also provide more. Join us to be part of something significant that is transforming the affiliate landscape.Job OverviewAs a Senior Backend Developer within Stay22's Neuro Team, you will be pivotal in designing and developing robust backend systems that underpin our AI/ML infrastructure. The Neuro team's mission is to create, develop, and maintain our Roam and Spark engines—our machine learning-based redirection and affiliate link systems—along with associated services such as ML pipelines, model hosting, and LLM gateways.In this role, your focus will be on the AI/ML infrastructure (with model training managed by our ML engineers), ensuring seamless data flow in the pipelines and the reliability of inference services. You will support Stay22's Roam and Spark AI products by developing scalable backend APIs and services for real-time inference and analytics, while also creating APIs and tools that facilitate rapid AI experimentation at the enterprise level.Key ResponsibilitiesDesign, develop, and maintain end-to-end AI/ML pipelines and services, from data preparation to model deployment and real-time inference engines, to support Stay22's AI products.Develop the backend and APIs for the Roam (ML-based redirection) and Spark (AI-based affiliate links) engines, ensuring scalability, performance, and reliability.Create and maintain internal client/gateway layers for large language models (LLM), enabling product teams to leverage these models for functionalities such as content suggestion and classification.Collaborate with the ML engineering team to integrate trained models into production services and with the Data team to optimize the pipelines feeding the models.Work with the Forge/platform team to set up and maintain cloud infrastructure (GCP), ensuring high availability and performance.

Join Plusgrade as a Senior Software Developer on our Rail Team, where you'll have the opportunity to shape the future of travel technology! We are seeking a talented and experienced developer who is passionate about building innovative software solutions that enhance the passenger experience.In this role, you will collaborate with cross-functional teams to design, develop, and maintain high-quality software applications. Your expertise in software development and problem-solving skills will be crucial as you tackle complex challenges and contribute to our mission of delivering exceptional services to our clients.

Greetings! Are you on the lookout for your next professional challenge? Or perhaps you are simply exploring new opportunities? Either way, you may have just found the perfect place to advance your career with us.At Lightspeed Commerce, our Financial Automation team is dedicated to enhancing merchant operations by transforming tedious manual tasks, such as sales reconciliation, into intelligent, automated systems driven by AI. We connect intricate data with actionable insights, empowering our users to grow their business without the need for additional staff.As a Senior Full-Stack Software Developer with a focus on React.js, you will play a pivotal role in developing and maintaining key features within our essential financial products. Around 70% of your responsibilities will center on frontend development, while the remaining 30% will involve working across the rest of our technology stack. Your contributions will be vital in delivering new features, resolving bugs, enhancing user experiences, and supporting various related initiatives. We expect you to bring robust technical skills, assist the team in achieving their objectives, refine team processes and tools, and actively participate in production operations, including on-call duties.Note: Applications are being accepted exclusively from candidates located within Canada.Key Responsibilities:Foster strategic collaboration during development planning, retrospectives, and demonstrations;Oversee the system design and architecture for innovative, large-scale features, ensuring that solutions are robust, scalable, and maintainable;Translate high-level requirements into clear development tasks and actionable work items;Manage and communicate expectations, priorities, release statuses, and project timelines to stakeholders and team members;Lead effort estimation for sprint activities and product roadmap milestones;Advocate for continuous improvement in our software delivery processes and practices;Mentor and coach team members actively;Shape the future of our engineering workforce by participating in recruitment efforts;Provide both technical and process guidance;Elevate coding standards and best practices through thorough code reviews in a collaborative environment;

Join Our TeamBecome a pivotal part of the team that designs and evolves the Unity Package Manager ecosystem—a backbone that empowers millions of creators to discover, share, and integrate extensions that enhance their workflows. Collaborate with multiple teams within Unity to design and deliver robust backend services and integrations within the Unity editor that support the creation and use of packages on a global scale.In the initial months, your success will be measured by delivering enhancements to service functionalities, contributing to key features of the package manager and its integration within the Unity editor, and elevating code quality through testing and reviews. In the long run, you will help define the next generation of ecosystem management for Unity.Your impact will be felt directly by internal teams and external creators by making package development faster, safer, and more reliable.This role offers the opportunity to work with multiple programming languages (Node.js/C#/C++), tackle large-scale distributed systems challenges, mentor peers, and set standards for developer experience within a widely used platform.

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.

Join MaintainX as a Senior Data Developer - Streaming, where you will be at the forefront of transforming our streaming data infrastructure. You will collaborate with cross-functional teams to develop robust data solutions that enhance our real-time analytics capabilities. Your expertise in data pipelines and streaming technologies will be essential in driving our data strategy forward.

MaintainX stands at the forefront of Asset and Work Intelligence, offering a cutting-edge IoT-enabled, cloud-based platform tailored for industrial and frontline environments. Our solutions enhance reliability, safety, and operational efficiency for physical equipment and facilities. Trusted by over 12,000 businesses, including industry leaders like Duracell, Univar Solutions Inc., Titan America, McDonald’s, Brenntag, Cintas, Xylem, and Shell, we empower organizations to achieve operational excellence.Having successfully secured $150 million in our Series D funding round, MaintainX has reached a total funding of $254 million, positioning the company at a valuation of $2.5 billion.We are on the lookout for a Senior Software Developer to spearhead the technical execution of MaintainX’s compliance initiatives and multi-region deployments, starting with our FedRAMP-focused AWS GovCloud environment. This hands-on role will encompass application development, infrastructure management, and collaboration across teams to ensure our regulated and regional deployments align seamlessly with our commercial SaaS architecture, while adhering to stringent compliance, security, and operational standards.This position is ideal for a seasoned developer who thrives on solving complex and ambiguous technical challenges, translating them into actionable, practical solutions that can be adopted by teams without requiring extensive domain knowledge.

Senior Software DeveloperTravel is more than just reaching a destination; it is about the memories created along the journey. At Plusgrade, we are committed to redefining the future of travel by partnering with over 200 airlines, hotels, cruise lines, rail networks, and financial services to generate significant new revenue streams through exceptional customer experiences. Grounded in our core values of ambition, innovation, and collaboration, we strive to push boundaries, exceed expectations, and harness the best of each individual. Join us in our mission to transform everyday journeys into truly extraordinary experiences.ABOUT THE POSITION:We are seeking an experienced Senior Software Developer to join our team in creating exceptional new products for airlines and travelers. This role is based in our Montreal office.We believe there are still many complex, unsolved challenges in travel technology. If you are motivated to tackle some of these challenges with us, we would love to meet you.Our software developers are generally full-stack. In a typical week, you will develop new features with a cross-functional team comprising product managers, designers, backend and frontend developers, automation and testing specialists. We value rapid and frequent delivery of high-quality, well-tested features.You will also collaborate with peers to propose technical solutions and contribute to internal tools that optimize our development processes. Additionally, you will assist our support and operations teams in analyzing and troubleshooting incidents.This role requires strong expertise in the Sabre Passenger Service System (the reservation, inventory, and departure control system for airlines), supported by several years of development experience with Sabre APIs and collaboration with Sabre teams.

Plusgrade works with over 200 partners across airlines, hotels, cruise lines, rail networks, and financial services to develop new revenue opportunities and enhance travel experiences. The company values ambition, innovation, and teamwork, emphasizing shared achievements and collaboration. Headquartered in Montreal, Plusgrade is dedicated to shaping travel’s future through joint effort and a commitment to exceptional customer journeys. Role overview This is a contract position for a Senior Software Developer in Test, based in Montreal, Quebec. The role sits within the QA team and focuses on maintaining and raising the quality standards across Plusgrade’s product lineup. What you will do Act as a quality mentor and automation specialist within the QA group Work closely with Agile development and product teams to support project goals Use automated testing tools and proven testing techniques to validate software Contribute to the quality of web, mobile, and service-based applications Help protect product integrity as new features and customers are added Location This role is based in Montreal, Quebec.

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.

About UsAt osedea, we are a dynamic and innovative technology development company that places people at the core of our mission. Our commitment extends beyond delivering exceptional services to our clients; we genuinely care about our team members' aspirations, dreams, and professional growth.We believe in the strength of community, actively seeking to forge meaningful connections with everyone we encounter.Diversity is celebrated in all its forms here. We value different backgrounds, perspectives, and experiences, fostering an environment where every individual feels welcomed and included.With a focus on collaboration and enjoyment, we approach each day with enthusiasm as we strive to create a more efficient and enjoyable world.

Are you prepared to immerse yourself in the realm of innovative video game development? Based in Montreal, Behaviour Interactive stands at the cutting edge of the gaming industry, delivering unforgettable experiences across PC, console, and mobile platforms. We are a vibrant, independent studio with over 1200 dedicated employees operating in Toronto (Behaviour Toronto), Rotterdam (Behaviour Rotterdam), and the UK (Behaviour UK–North & South). Our daily operations are centered around two primary business focuses: Services and Original Games. Our Services team partners with major gaming and entertainment leaders such as Disney, Sony, Activision, and Nintendo, providing exceptional work-for-hire development and pioneering immersive location-based entertainment (LBE). Concurrently, our Original Games division pushes creative boundaries with our signature intellectual properties, including the renowned Dead by Daylight. Join us and be a part of the future of interactive entertainment!At Behaviour Interactive, we are committed to ensuring everyone has an equal opportunity. We celebrate diversity and creativity in our environment and value individuals of all ages, genders, ethnicities, colors, national origins, religions, sexual orientations, gender identities, civil statuses, disabilities, or any other protected characteristics as per applicable law.We are seeking a Senior Programmer to play an integral role in bringing a AAA title to fruition.As a member of an engine-focused gameplay and systems team, you will contribute to the design and implementation of medium-to-large scale game systems, with a strong focus on console performance and stability. If you enjoy challenging yourself technically, taking ownership of intricate systems, and enhancing your team’s pipelines and workflows, we encourage you to apply!

Join Medfar as a Senior Full Stack Developer and play a pivotal role in transforming the healthcare SaaS landscape. You will be responsible for designing and implementing innovative software solutions that enhance patient care and streamline healthcare processes. Collaborate with cross-functional teams to deliver high-quality applications that meet the needs of healthcare professionals and patients alike.

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.

Join Behaviour Interactive as a Senior Gameplay Programmer for an exciting co-development project! In this role, you'll work collaboratively with a talented team to design, implement, and optimize engaging gameplay mechanics. Your expertise will contribute to creating immersive experiences that captivate players worldwide.As part of our innovative environment, you will have the opportunity to tackle challenging problems, utilize cutting-edge technology, and influence the direction of gameplay features. If you're passionate about gaming and dedicated to delivering high-quality work, we want to hear from you!

Join Our Dynamic Team:We are on the lookout for an experienced Senior Software Developer with in-depth expertise in Microsoft Dynamics 365, the Power Platform, and Azure integration technologies. In this pivotal role, you will architect and implement scalable and secure solutions within the Microsoft enterprise ecosystem, taking charge of integration strategies and technical leadership.Your Daily Responsibilities:Lead the design and development of custom solutions utilizing Dynamics 365, Power Platform, and Azure technologies.Implement code in C#, create CRM plugins, develop front-end components using JavaScript/TypeScript, and build RESTful APIs.Design integration processes with Azure Logic Apps, Azure Functions, and Service Bus.Establish best practices for using Dynamics 365 Web API, Webhooks, and Virtual Entities.Apply secure design patterns (OAuth, API management).Involve in DevOps automation via Azure DevOps (CI/CD pipelines, deployment strategies).Mentor junior developers and contribute to technical standards and code reviews.Your Profile:Fluency in French and English, both spoken and written (this role requires collaboration with international partners and clients).A minimum of 5 years of full-stack development experience, including:C#, .NET Core / .NET FrameworkJavaScript / TypeScript, REST APIsAzure Logic Apps, Azure Functions, Service BusDeep knowledge of Microsoft Dynamics 365 customizations and integrations.Proficiency in the Power Platform (Power Apps, Power Automate).Strong understanding of OAuth, API security, and JSON/XML transformations.Experience with CLI tools, Postman, and Swagger.Implementation of CI/CD using Azure DevOps.Preferred Qualifications:Microsoft certifications (e.g., Azure Developer, Power Platform, Dynamics 365).Experience with microservices or large-scale enterprise systems.Experience in developing EDI services (cXML, X12, AS2).What We Offer:Attractive compensation package.Training reimbursement program.Subsidized meals at our fantastic Bistro (Les Cordons Bleus).Work-life balance with flexible working hours.Unlimited free coffee.Free parking for all employees.On-site fitness center.

Join Syntronic: Where Your Innovation Shapes the FutureAt Syntronic, we don't just follow industry trends; we set them! We invite you to collaborate with visionary companies and brilliant minds to transform groundbreaking ideas into reality. Picture yourself working on cutting-edge advancements in telecommunications, pioneering automotive technologies, life-saving healthcare innovations, or next-generation industrial automation. Our projects are diverse, impactful, and at the forefront of technological innovation. Be part of something extraordinary!