Senior Full Stack Engineer (.NET & Vue/React) - Fully Remote

Join Toptal, a prestigious network of elite freelance software developers, designers, finance experts, marketing professionals, product managers, and project managers from around the globe. We specialize in offering independent contractor freelance opportunities, ensuring a flexible work environment that prioritizes quality and creativity.Our client, a leading global media and technology company, is on a mission to connect people with their passions. They are currently seeking talented engineers to enhance their Mail platform across Android, iOS, and Web. This role involves contributing to large-scale front-end web application development aimed at modernizing the Mail platform and elevating user satisfaction to match industry standards.The team is responsible for the end-to-end development and maintenance of webmail, mobile web, and classic web products. As a part of this dynamic team, you will play a pivotal role in shaping the future of their digital communication tools.Responsibilities:Provide technical leadership in a fast-paced environment.Enforce best practices including design reviews, code reviews, CI/CD, and TDD.Develop high-quality, high-performance features utilizing Node.js and React.js.Collaborate closely with designers, product managers, and fellow engineers.Write testable, reliable code and ensure continuous deployment.Optimize application performance and scalability.Operate and monitor global-scale production systems.Requirements:Minimum of 8 years of experience in React, Redux, Node.js, and responsive design.Strong understanding of computer science fundamentals: data structures, algorithms, and software design.Expertise in HTML5, CSS3, TypeScript, and modern JavaScript frameworks.

Join our rapidly expanding team at MixMob as a Senior Full-Stack Developer with expertise in React, Node.js, and NFT gaming. We embrace the freedom of remote work, allowing you to thrive independently and creatively. You will bring exceptional organizational skills and an eye for product quality, aspiring to take on leadership responsibilities. Your role will involve close collaboration with our talented team, known for its innovative instincts and deep passion for technology.This position requires a proactive and communicative individual who can contribute significantly to our game development. You will work alongside the Technical Lead and operational managers, ensuring high-quality standards are met across all aspects of our gaming projects.Your potential for growth in this position is limitless. Here’s what you’ll be doing:Oversee and enhance our React codebase, contributing to its continuous improvement.Collaborate with our external Unity Game Development team to facilitate seamless integration with our multiplayer gaming platform.Design and implement an API for effective player data management.Work closely with our crypto services team to guarantee secure and efficient transactions for players.Proactively identify potential technical challenges and assist in drafting technical briefs.Foster a culture of technical excellence within the team.Deliver concise and relevant insights to our leadership team.Uphold the game’s quality standards while maintaining agility.Devise innovative solutions to complex challenges, including tools and services.Prioritize user needs in the development of products and features, reflecting MixMob’s unique user experience.Support MixMob’s CI/CD pipelines as needed.Fully engage with the MixMob ecosystem, embodying its technical, creative, and cultural aspects.Play a key role in attracting, interviewing, and recruiting engineering talent.Provide technical leadership in software development, encompassing code reviews, automated testing, and project scheduling.Evaluate technical designs to ensure scalability and robustness, maintaining a high standard for code quality and architecture.

The Invoicing team at Lightspeed Commerce Inc. forms part of the Financial Services division. This group creates and maintains solutions that support sales, pre-sales, and customer accounts receivable. By streamlining financial transaction flows, the team helps drive business growth and ensures a dependable experience for clients. Role overview The Senior Full Stack Developer (Go & React) contributes to the development and upkeep of features for core financial products. Responsibilities include designing new functionality, resolving bugs, and enhancing system architecture. The work has a direct effect on the reliability and performance of Lightspeed’s financial tools. Collaboration is central to this role. The developer will work closely with teammates to improve processes and tools, and will also participate in production operations, including on-call rotations. Location requirement This position is open to applicants located anywhere in Canada. Lightspeed requires candidates to be based within the country.

Play a key role in the design, development, and testing of software throughout the entire development life cycle.Draft specifications and comprehensive documentation.Collaborate with fellow developers and software architects to design and implement both front-end and back-end applications, including modules, databases, and deployment strategies.Deliver high-quality code by adhering to best practices and utilizing tools such as unit testing, formatting, and linting.Engage in DevOps activities to deploy, validate, and maintain the operation of services and applications.Work closely with software architects and other developers to ensure project alignment.Provide guidance and mentorship to junior or mid-level engineers as needed.Collaborate effectively with customer support and the Smart-Monkey engineering teams.Demonstrate the ability to manage tasks autonomously and deliver results independently when required.Exhibit a strong capacity to transition from high-level decision-making to practical execution, adding value and exceeding expectations while contributing to the success of the company.

jobgether is looking for a Senior Full-Stack Engineer with strong skills in Python and React. This position is based in Canada and focuses on building and improving web applications that support the company’s goals. Role overview This role involves designing and implementing web solutions, working closely with colleagues from different teams. The Senior Full-Stack Engineer will help ensure that applications are efficient and meet business requirements. What you will do Develop and maintain web applications using Python and React Collaborate with cross-functional teams to deliver features and improvements Mentor junior developers and support their growth Conduct code reviews and encourage high standards in software development Impact Contributions in this role will shape both the product and the technology stack at jobgether. The Senior Full-Stack Engineer will help set best practices and influence the direction of future projects.

The Invoicing team at Lightspeed Commerce Inc. forms part of the Financial Services division. This group designs and maintains tools that help with both sales and pre-sales activities, as well as managing customer accounts receivable. Their work supports reliable financial processes for clients and contributes to business growth. Role overview The Senior Full Stack Developer (Go & React) will work on Lightspeed’s core financial products. Responsibilities include developing and maintaining important features, updating and improving the codebase, adding new capabilities, resolving bugs, and contributing to architectural improvements. The team values practical technical skills and a collaborative mindset for evolving both tools and processes. This position also involves supporting production operations, including participation in on-call rotations and handling related operational tasks as required. Requirements Must be currently residing in Canada. Lightspeed will only consider applicants located within Canada for this role.

Join NDAX, one of Canada’s premier and rapidly expanding cryptocurrency trading platforms, setting new standards in the fintech sector with a strong focus on security and innovation. Our mission is to empower Canadians to fully harness the potential of digital finance. Our diverse multidisciplinary team comprises experts from finance, technology, engineering, compliance, marketing, and beyond, working collaboratively to address the evolving needs of the Canadian cryptocurrency landscape.We are honored to be recognized as one of Canada’s Best Workplaces by Great Place to Work®.We are seeking a talented Senior React Native Developer to create scalable software solutions. You will be an integral member of a cross-functional team responsible for the complete software development lifecycle, from ideation to deployment. As a Senior React Native Developer, you will be adept with both front-end and back-end coding languages, development frameworks, and third-party libraries. A collaborative mindset and an appreciation for visual design and functionality are essential. Familiarity with Agile methodologies is highly valued.Your responsibilities will include: Collaborating within a small team to develop React Native applications for iOS and Android. Architecting, developing, and maintaining high-quality React Native applications with clean, efficient code. Creating pixel-perfect user interfaces that align with design specifications. Implementing modern, smooth animations and transitions to enhance user experience. Integrating third-party APIs seamlessly. Writing comprehensive unit and integration tests. Publishing applications to the Apple App Store and Google Play Store. Utilizing native modules when necessary. Engaging with a small team that includes other React Native developers, a project manager, QA specialist, and designer. Participating in two-week sprint cycles, including retrospectives and daily standups. Assisting with project estimation tasks. Utilizing modern tools like Jira, Slack, GitHub, Bitbucket, and Google Docs. Contributing to a community of React Native developers who share insights and support one another in overcoming challenges. Adhering to Full Stack's comprehensive development processes.

As a Lead Developer at Thoughtworks, you will serve as the main liaison for our clients, ensuring the successful delivery of projects by your teams. This position requires a strategic mindset, enabling you to collaborate effectively with clients and translate their technical vision into reality. Balancing high-level strategy with tactical execution is essential, as you will engage both with clients and your team members.At Thoughtworks, we go beyond conventional standards, dedicating ourselves to delivering exceptional solutions that not only meet but exceed client expectations. Our engineering and delivery practices exemplify our commitment to quality, and we continuously seek opportunities to innovate and enhance our processes. As a Lead Developer, you will guide and mentor your team, fostering their growth and application of best practices.

About the RoleWe are seeking aSenior Full Stack Software Developer to play a key role in designing and developing our core systems.This position is perfect for engineers with robust hands-on capabilities and an evolving architectural perspective, who thrive in complex, high-scale environments.Key Responsibilities:Utilize AI tools (e.g., Copilot, ChatGPT, Cursor) to enhance development efficiency and code quality.

About Borrowell:Borrowell is dedicated to empowering Canadians with the confidence to manage their finances effectively. Our mission is to provide individuals with the essential tools and insights to understand, build, and utilize their credit wisely.With 1 in 10 Canadians utilizing our services for comprehensive credit monitoring and tailored insights, we offer innovative solutions such as Credit Builder and rent reporting to help consumers enhance their creditworthiness, thereby gaining access to a broader array of financial products at competitive rates. Additionally, we provide personalized recommendations for financial products from Canada's most trusted providers, aligned with each member's credit profile and financial objectives.Our diverse and inclusive team is driven by a shared commitment to making a significant impact in the financial lives of Canadians. We foster a culture characterized by collaboration, humility, and innovation. If you aspire to join a company that is reshaping the financial landscape and empowering Canadians to realize their financial goals, we encourage you to explore career opportunities at Borrowell. Together, we can instill confidence in Canadians regarding their financial matters.About the Role:As a Senior Frontend Developer, you will spearhead the technical vision and execution of our marketing site and web experiences focused on growth. Your role will involve rebuilding and taking ownership of our marketing website utilizing React and Next.js, while implementing server-side rendering and modern routing techniques to enhance speed, SEO, AEO/GEO (AI/Generative Engine Optimization), and adaptability. You will work at the intersection of engineering, marketing, and design to convert site traffic into measurable business results, engaging hands-on with the codebase and influencing the roadmap, architecture, and best practices across the team.In the first 3-6 months, you can expect to:Conduct a comprehensive audit of the current marketing site, assessing performance, SEO, analytics setup, and experimentation capabilities to propose and implement a prioritized improvement strategy.Lead the overhaul or significant refactoring of the site using Next.js and a headless CMS, with a focus on future experimentation and rapid content updates.Establish or enhance analytics and event tracking to provide comprehensive visibility into acquisition, activation, and key conversion events.Initiate a series of growth experiments (e.g., pricing page tests, signup flow optimizations, new landing pages) and develop a repeatable experimentation framework.

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.

jobgether is looking for a Mobile Developer who specializes in React Native. This role focuses on building mobile applications that help users get more from the platform. Collaboration is central, with regular teamwork and hands-on coding involved. Key responsibilities Build and maintain mobile apps using React Native Suggest improvements to make the user experience better Adapt to new tools and technologies as the team grows Location This position is located in Canada.

About Us: Established in 2001, Vivid Seats (NASDAQ: SEAT) stands as a premier online ticket marketplace, dedicated to seamlessly connecting fans with the live events, artists, and teams they cherish. We firmly believe in the transformative power of experiences and are unwaveringly committed to crafting products that foster human connections. Recognized as one of Built In's top workplaces in 2025, we understand that our people represent our most significant competitive advantage. Our culture is designed to empower employees to embrace challenges, promote collaboration, and continuously innovate through data-driven insights.We harness cutting-edge technology to enhance performance and unleash creativity. In our culture of innovation, we embrace AI tools to facilitate improved decision-making, streamline workflows, and deliver superior outcomes for our customers.

Your Role and Team:Join the Genetec One cloud software development team at our Brossard office, where we strive to streamline our clients' operational tasks through a robust subscription management application. Our portal empowers clients with advanced tools to monitor, configure, and maintain their systems remotely, ensuring exceptional service throughout the subscription lifecycle.As a developer on our team, you will be responsible for designing and implementing new features for subscription management, primarily using .NET for backend microservices and React for our web application. You will engage in secure and scalable solution analysis and design, write clean and maintainable code, and adhere to best practices for performance, accessibility, and reliability. This position represents a unique opportunity to deepen your expertise in distributed cloud system development.We are looking for passionate individuals who embrace cloud services and modern development practices. Collaboration and teamwork are key here: you enjoy problem-solving, effective communication, and continuous learning. You will work autonomously while consistently seeking to enhance your skills and the systems you help build.Our team culture promotes a pleasant and stimulating work environment, respecting work-life balance and valuing diversity. Whether during team lunches, after-work events, or outdoor activities, we love to come together to celebrate our successes and memorable moments.

Join Sensor Tower, a leading provider of mobile market intelligence, as a Senior Frontend Engineer specializing in React. In this role, you will be pivotal in enhancing our user interface and ensuring a seamless experience for our clients. You will collaborate with cross-functional teams to design and implement high-quality and innovative web applications.

English version belowTravel is more than just reaching a destination; it is woven with every memory created along the way. At Plusgrade, we are committed to redefining the future of travel. We collaborate with over 200 airlines, hotel chains, cruise companies, rail networks, and financial services to create significant new revenue streams through exceptional customer experiences. Grounded in our core values of ambition, innovation, and collaboration, we continuously strive to push boundaries, exceed expectations, and harness the best from each other. We foster a culture that believes our strength lies in unity, working together to build an extraordinary future in the travel industry. Join us in transforming everyday travel into truly remarkable experiences.ABOUT THE POSITION:As a Senior Frontend Software Developer, you will be responsible for designing technical solutions for our loyalty e-commerce platforms and guiding development teams throughout the software development lifecycle. This role requires advanced expertise in frontend development using React, TypeScript, solution architecture design, CI/CD, and engineering best practices. Excellent communication and collaboration skills are essential, as you will lead teams in developing new product features.YOUR RESPONSIBILITIES:Reporting to the Director of Software Engineering, you will:Collaborate with the product team to design new features that add value to millions of loyalty members worldwide.Share the responsibility for your team’s technical health: architecture, best practices, reliability, security, etc.Work with Salesforce Commerce Cloud's headless CMS to support storefront creation.Engage with scrum masters, product owners, designers, and other stakeholders.Enhance the developer and user experience through thoughtful design, rigorous testing, and clear documentation.Play a key role in delivering high-quality products to our partners and clients.YOU ARE SOMEONE WHO:Possesses excellent communication skills.Has 5+ years of experience in building applications with NodeJS, TypeScript, React, HTML, and CSS.Has experience in...

TouchBistro Inc. develops and supports mobile applications that serve over 15,000 restaurants. The engineering team delivers updates multiple times a day, relying on strong internal tools and clear system monitoring to keep everything running smoothly. Role overview This Senior Mobile Software Developer position centers on building and enhancing React Native features for both iOS and Android. The work spans the full development cycle, from shaping ideas to releasing polished updates that improve the restaurant experience. What you will do Lead feature development: Take charge of React Native projects, guiding them from concept through launch for both major mobile platforms. Deliver iteratively: Break down projects into manageable pieces, shipping improvements quickly and using modern tools, including AI, to boost productivity. Collaborate closely: Work with teammates to design scalable solutions, participate in code reviews, and help refine development processes. Prioritize quality: Integrate testing, performance checks, and reliability measures into daily work to maintain high standards. Mentor others: Share knowledge with colleagues, helping to shape stronger engineering practices and tools across the team.

Role overview Range is seeking a Senior Frontend Software Developer based in Toronto, ON. This position centers on building and refining web applications that enhance user experience and align with the company’s product objectives. What you will do Develop and maintain features for the frontend of web applications Collaborate with cross-functional teams to ensure seamless integration between user-facing components and backend systems Influence the direction and structure of frontend architecture Support ongoing improvements to the product Requirements Background in building modern web applications Strong interest in current frontend technologies Ability to work effectively with engineers, designers, and product managers Drive to enhance products and user experiences

Company DescriptionWorkleap, headquartered in Montreal, is a pioneering technology firm dedicated to simplifying the workplace experience. Since our inception in 2006, we have developed innovative solutions aimed at addressing the most pressing challenges in HR and IT.Our diverse product offerings include:Workleap Platform - an AI-driven HR solution engineered to enhance team performance and foster employee engagement.ShareGate - the premier Microsoft 365 migration and governance tool, renowned for its unparalleled user-friendliness and trusted by IT experts globally.Today, over 20,000 organizations leverage Workleap's products to empower their growth, leadership, and operational confidence. Our core mission is to design intuitive products that deliver tangible value to our users.Job DescriptionAs a Senior Web Developer on the ShareGate marketing team, you will be the technical force that transforms visionary concepts into reality. You will oversee the technical aspects of our projects: developing functionalities that exceed Webflow's capabilities, ensuring seamless integrations, and maintaining accurate analytics tracking to inform our strategic decisions.Your expertise will be sought after for complex technical challenges, the creation of impactful microsites for campaigns, and accelerating the team's workflow without compromising on quality.Key Responsibilities:Develop and implement web pages, components, and landing pages in Webflow, incorporating custom code as necessary.Establish, maintain, and enhance integrations with third-party tools such as Intercom, Spara, MCP, and others.Manage the entire analytics implementation process, including event tracking setup, data integrity validation, and ensuring our decisions are data-driven (using tools like GTM, GA4, etc.).