Senior Full Stack Software Developer with React.js Expertise

Hello and welcome! Are you seeking an exciting new opportunity? Whether you're actively searching or just exploring the market, you've come to the right place to consider joining our dynamic team.The Invoicing team is a vital part of the Financial Services division at Lightspeed. We focus on crafting and implementing solutions that streamline sales and pre-s…

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.

Hello and welcome! Are you on the lookout for an exciting new challenge or just exploring your options? Either way, you’ve come to the right place! Join our dynamic team at Lightspeed. The Financial Automation team at Lightspeed is dedicated to enhancing merchant operations by transforming cumbersome manual processes into intelligent, AI-driven automated systems. We connect complex data with actionable insights, empowering our users to scale their businesses without the need for additional staff. In your role as a Senior Full Stack Software Developer, you will play a crucial part in the development and maintenance of essential features in our financial products. Your focus will be on frontend development, constituting approximately 70% of your responsibilities, while the remaining 30% will involve backend development. Your contributions will enhance the overall codebase through new feature development, bug resolution, user experience improvements, and support for related tasks. We expect you to bring strong technical know-how, assist the team in achieving its objectives, refine team processes and tools, and actively participate in various production operations, including on-call duties. Note: We are currently accepting applications from candidates located in Canada only.

Range Group supports professional travel advisors throughout North America, handling over $4.5 billion in travel sales annually. The company provides advisors with advanced technology and 24/7 support. Through the Range Foundation, 10% of group profits go toward scholarships, education programs, cultural infrastructure, and crisis relief projects. Location and Work Arrangement This Senior Full Stack Software Developer position is open to candidates across Canada. Those within commuting distance of the Toronto office (2 Queen St. E) follow a hybrid schedule, working onsite two days each week. Fully remote work is available for candidates living farther away. Role Overview The role joins TripArc's ADX platform team, focusing on the core booking tool used daily by thousands of travel advisors. While other teams develop the next generation of the platform, this position is dedicated to ongoing improvements of the current system, enhancing speed, reliability, and user experience. This is a full-stack role with a strong emphasis on backend development. Project focus shifts with each sprint: one cycle may streamline payment workflows, while another might enhance 24/7 service features or boost performance during busy periods. The position offers ongoing technical challenges and opportunities to make a direct impact. Key Responsibilities Lead investigations into technical issues and recommend practical solutions Work with Product and QA teams to clarify project scope and deliverables Implement improvements that affect thousands of travel advisors in real time Balance backend development with occasional frontend tasks as needed How We Build Developers at Range Group are encouraged to use AI coding tools (such as GitHub Copilot, Claude, or Cursor) in their workflow. This approach is standard practice, intended to speed up development while maintaining quality through code review and testing. Success in this environment depends on using AI assistance thoughtfully, without compromising code quality.

About Us:Centah, a proud member of Financeit, is a leading SaaS provider dedicated to empowering home improvement businesses. Our innovative platform streamlines lead management, routing, and conversion, acting as the backbone of our clients' operations.Our Journey: We are transitioning from creating tailored solutions for a select group of large clients to launching a scalable SaaS platform for the broader market. This strategic shift is not only intentional but also fully funded, with a robust roadmap extending to 2028. This is a unique opportunity to influence the future of our product, rather than just maintaining an existing one.The environment at Centah is hands-on and impactful, offering significant ownership and visibility throughout the organization. You will collaborate closely with various teams, contribute to vital business decisions, and witness the tangible results of your efforts.We seek passionate individuals eager to contribute to our growth and shape the next chapter of Centah.Role Overview:In this position, you will navigate a complex ecosystem, managing the ingestion, transformation, and routing of data among partners, internal workflows, and downstream systems. Your work will focus heavily on integrations, including APIs and third-party systems, ensuring they operate seamlessly even in unpredictable environments.Our technology stack includes Ruby on Rails, Ember.js, and PostgreSQL—mature tools that must maintain stability, security, and performance as we expand.As we invest in scaling our system and supporting new go-to-market strategies, you will have the opportunity to shape the product's evolution rather than simply maintaining it.We are looking for a seasoned engineer excited to take ownership of challenges from start to finish. You should care about data consistency, understand potential failure points, and write code that remains clear and maintainable over time.You will collaborate with product-focused engineers, raise the quality bar, and help evolve our platform in line with our growing domain. If you thrive in an environment where ownership, clear thinking, and building resilient systems are paramount, we want to hear from you.Your Responsibilities:Manage features from initial design through to production and iterative improvements (API, domain logic, background jobs, and UI).Create clean, testable, and maintainable code with well-defined separation of concerns.Make architectural choices to enhance reliability, scalability, and clarity of the system.Deliver new features, resolve defects, and enhance existing systems rather than just addressing superficial issues.Collaborate closely with Developers, Product, Design, and stakeholders to develop comprehensive solutions.Proactively identify risks, edge cases, and trade-offs, driving decisions forward.Mentor junior engineers on architecture, ownership, and code excellence.Contribute to team processes to improve our delivery capabilities and overall efficiency.

About Us At Konrad Group, we pride ourselves on being a leading digital consultancy dedicated to delivering innovative and effective solutions for complex business challenges faced by our global clientele. Our dynamic work culture fosters creativity and collaboration, enabling our talented team to create best-in-class digital products that reach hundreds of millions of users worldwide. We are always on the lookout for exceptionally talented, analytical, and driven individuals who are passionate about continuous learning. Role Overview As a Senior Full Stack Developer, you will play a crucial role in our software development team, focusing on developing web applications. Your expertise will contribute to the creation and deployment of both consumer and enterprise applications. This position is perfect for ambitious developers who are confident in their technical skills and eager to join a highly skilled team at Konrad Group. Key Responsibilities Collaborate with our top-tier team to produce maintainable, testable, and high-performance software. Engage in code reviews and conduct thorough testing to ensure the delivery of high-quality software. Explore and evaluate new technologies and tools, sharing insights with the team. Communicate effectively with all team members to facilitate collaboration and knowledge sharing. Required Qualifications Over 5 years of experience in building and deploying modern, production-grade web applications in a team setting. Strong proficiency in JavaScript, with hands-on experience using tools and frameworks such as TypeScript, Node.js, and Next.js. Experience with front-end JavaScript frameworks like React, Angular, or similar. In-depth understanding of the components that constitute a modern web application (APIs, routing, data storage, design patterns, optimization, security). Solid foundational knowledge of core web principles (HTTP, the DOM, SSL, web servers). Excellent interpersonal skills, as teamwork and communication are essential. A proactive mindset with a commitment to delivering exceptional work. A passion for enhancing software development workflows and processes. Preferred Qualifications Experience with custom development using Next.js, Gatsby, Remix.js, or similar technologies. Familiarity with content management systems (e.g., WordPress, AEM, Sitefinity). Experience in cloud environments (e.g., AWS, Google Cloud, Azure). Knowledge of GraphQL, ElasticSearch, Serverless technologies, or Next.js.

A Few Notes:Thriving B2B SaaS organization with teams operating across North America.This position offers a predominantly remote work arrangement based in Toronto, with monthly team meetings.Candidates must possess legal authorization to work in Canada; visa sponsorship is not an option.We are expanding our Engineering team and seeking a Full Stack Developer skilled in Python and React to join our applications team.We welcome applicants with experience levels ranging from Upper Intermediate to Staff Engineer.This role encompasses full-stack responsibilities, but we are open to candidates who have a stronger focus on back-end development.About Us:We are recognized as a leading retail analytics platform, empowering marketing teams and brands to gain insights from their retail data and execute targeted media campaigns without needing coding skills. Our mission is to enhance our clients' understanding of their customers while maximizing the return on their marketing investments. Notably, one of our significant clients is Home Depot.Our Technology Stack: Python, Django, React, Typescript, Azure.How We Work:We foster a collaborative environment with an array of exciting and complex projects.We support the exploration of new technologies, reflecting our identity as a modern tech company.Our focus is on sustainable development; we are already profitable and prioritize quality.With a remote work setup, we convene once a month in Toronto and hold biannual company retreats.About You:We are on the lookout for a remarkable Senior/Staff/Lead Full Stack Engineer eager to make a significant impact on our applications team.Key Responsibilities:Full Stack Development: Manage end-to-end client feature development, from initial design to final delivery.Integration Projects: Collaborate with industry leaders like Meta, TikTok, and Snapchat within the ad tech domain.User Interface Enhancements: Optimize the UI experience for our enterprise clients.Qualifications:Over 6 years of full-stack development experience in creating enterprise-level B2B/B2C SaaS applications.

At Citylitics, we provide cutting-edge predictive intelligence that informs where, how, and why infrastructure investments will be made across North America. Our focus on infrastructure encompasses essential services such as water, transportation, transit, roads and highways, broadband, and power systems. This multi-trillion-dollar market represents a significant megatrend that will continue for over 20 years in North America.We transform vast amounts of data from over 40,000 cities, utilities, and public agencies into real-time market signals and invaluable sales intelligence. Our platform empowers leading infrastructure vendors, engineering firms, and construction companies to identify and strategically position themselves for major infrastructure opportunities well in advance, enabling them to cultivate relationships, prioritize projects, and influence project scopes before they reach formal procurement stages.Utilizing a sophisticated network of AI agents, finely-tuned models, and our proprietary infrastructure signals graph, combined with daily human-in-the-loop quality assurance processes, we deliver highly nuanced and reliable sales intelligence. Our platform seamlessly integrates with CRMs, ERPs, and data lakes, embedding actionable insights directly into sales workflows so teams can effectively prioritize their pursuits and strengthen their pipelines.Our mission is to enhance the decision-making process surrounding infrastructure investments, ensuring that critical needs are addressed sooner and that communities benefit from more resilient infrastructure. Join Citylitics and contribute to an industry that will have lasting significance while helping to grow a company that stands at the forefront of applied AI. We operate with a results-driven mindset and a commitment to excellence in a collaborative environment where teamwork is key to overcoming challenges and celebrating successes together.This position offers a hybrid work model based out of our Toronto office.

Veeva Systems is a forward-thinking, mission-driven organization that is at the forefront of industry cloud solutions, dedicated to accelerating the delivery of therapies to patients in the life sciences sector. As one of the fastest-growing SaaS companies in history, we achieved over $2 billion in revenue last fiscal year and are poised for further significant growth.Our core values at Veeva—Do the Right Thing, Customer Success, Employee Success, and Speed—define our approach to business. We made history in 2021 by becoming a public benefit corporation (PBC), which means we are legally committed to balancing the interests of our customers, employees, community, and investors.As a Work Anywhere company, we offer the flexibility to work from home or in our office, allowing you to excel in an environment that suits you best.Join us in transforming the life sciences industry, as we strive to make a meaningful impact on our customers, employees, and communities.

About Range Group Range Group supports professional travel advisors with technology and 24/7 support. The company manages $4.5 billion in annual travel sales and believes travel advisors make every trip better. Range Group also dedicates 10% of group profits to social impact through the Range Foundation, funding exploration, education, cultural projects, and crisis support worldwide. Location and Work Arrangement This role is based in Canada. For those near Toronto, the position is hybrid with two days each week at the office (2 Queen St. E). Candidates outside commuting distance may work from home. Role Overview The Senior Software Developer (Backend or Full-stack) joins a team focused on TripArc's ADX platform. This booking tool supports thousands of travel advisors across North America. While another team builds the next-generation platform, this pod keeps existing features evolving, making them faster, more reliable, and better aligned with user needs. This position suits a senior developer who enjoys backend challenges. Work changes from sprint to sprint: one cycle might refine payment flows, another could improve always-on service, and the next might focus on optimizing performance under heavy usage. The scope is broad, and priorities shift as needs arise. What You Will Do Enhance and maintain features on the ADX platform used daily by travel advisors Investigate issues, propose solutions, and scope tasks with Product and QA teams Deliver code that goes directly into production Work without waiting for detailed specifications, take initiative to solve problems See the direct impact of your work in how advisors use the platform How the Team Works Developers at Range Group use AI coding tools such as GitHub Copilot, Claude, or Cursor as a regular part of their workflow. These tools help speed up development and improve code quality, alongside thorough code review and testing. Experience with AI-assisted development is important for success in this role. Who Should Apply Senior developers with strong backend or full-stack experience Those comfortable with changing priorities and varied technical challenges People who work well with minimal direction and enjoy collaborating across teams Developers who have mastered AI-assisted coding tools

Elevate Your Career with Loopio! Loopio is on the lookout for a driven and inquisitive Full Stack Software Developer to become a vital part of our expanding feature development teams. Collaborating with a dynamic group of Engineers, Product Managers, and Designers, you will play a key role in delivering an exceptional product to our users. Our team thrives on collaboration, emphasizing mutual support and teamwork in everything we do.Note: This position is currently open within our team.Your ResponsibilitiesWork closely with Product Managers and Designers in an agile setting to transform features into reality, refining them based on user feedback.Leverage your full stack development skills to assist the team across both frontend and backend tasks.Identify, troubleshoot, and resolve software defects through manual testing and automated tests to ensure consistent, high-quality releases.Engage in all Scrum rituals, including planning, backlog grooming, sprint reviews, retrospectives, and daily stand-ups.Support the transition of our application to a service-oriented architecture.Proactively address bugs with a focus on delivering quality software.Contribute to technical estimations and project planning for development tasks.Create and maintain technical documentation for features and system components.

At Veeva Systems, we are at the forefront of revolutionizing the life sciences industry. As a mission-driven organization and a leader in industry cloud solutions, we empower life sciences companies to accelerate the delivery of therapies to patients. Our impressive growth trajectory has propelled us to surpass $2 billion in revenue last year, and we are excited about the extensive opportunities ahead.Our core values—Do the Right Thing, Customer Success, Employee Success, and Speed—define who we are. Notably, we made history in 2021 by becoming a public benefit corporation (PBC), committed to balancing the needs of our customers, employees, society, and investors.As a Work Anywhere organization, we offer you the flexibility to work from home or in our office, allowing you to thrive in your preferred environment.Join us in transforming the life sciences sector and making a positive impact on our customers, employees, and communities.The RoleWe are looking for a talented engineer to join our dynamic team in creating innovative full-stack products within a startup-like environment supported by a profitable enterprise. Ideal candidates will have substantial experience with Java, JavaScript, and contemporary open-source technologies.

We are seeking a talented Senior Full-Stack Developer who is passionate about creating scalable applications and tools that empower our internal teams. This position emphasizes the integration of AI capabilities into production systems, ensuring that our solutions are not only innovative but also reliable. You will play a key role throughout the development lifecycle—from architecture and implementation to deployment and optimization—while collaborating with cross-functional partners to deliver exceptional solutions.Take the lead on full-stack development initiatives, focusing on AI-enhanced functionality from the design phase to deployment.Work collaboratively across teams to discover opportunities for embedding AI-driven solutions within existing systems and workflows.Design, develop, and maintain both front-end and back-end components, ensuring high standards of code quality, scalability, and performance for new builds and existing applications.Participate in code reviews, contribute to architectural discussions, and uphold shared engineering standards.Enhance and develop data integrations, APIs, and tools to streamline and automate processes.

Hello, Future Homie!At Homebase, our mission is to empower small businesses by providing innovative tools that foster growth and success. We cultivate a dynamic, fast-paced environment where empathy and urgency drive our actions. Every member of our team is dedicated to elevating our collective achievements and supporting one another.We're not merely developing an application; we're creating unstoppable teams. Are you ready to join us?Your Impact Begins Here!We are in search of a Senior Full Stack Software Engineer to become a vital member of our Hiring Assistant team—one of the most pivotal initiatives for Homebase's future.This team is redefining the hiring process through the application of AI technology, enhancing everything from candidate discovery to screening and onboarding. You will play a crucial role in developing intelligent workflows that minimize friction for small business owners and expedite job searching for workers.In this impactful role, you will oversee end-to-end system development, shape architectural design, and drive AI-powered product innovations through the technology stack (React + Ruby on Rails).If you're passionate about creating AI-driven products that operate with speed, independence, and tangible impact, we want to connect with you.Your Contributions Will Include:Leading the design and development of scalable full stack systems utilizing React (frontend) and Ruby on Rails (backend)Taking ownership of complex features from conception through to production, focusing on Hiring Assistant workflowsArchitecting and evolving systems that facilitate AI-powered hiring experiences (screening, matching, automation)Integrating and applying AI/LLM tools, agents, and automation frameworks to enhance product functionality and team efficiencyCollaborating closely with Product, Design, and Data teams to achieve rapid, high-quality resultsDriving technical decision-making regarding system design, performance, and scalabilityEnhancing engineering efficiency through tools, experimentation, and AI-assisted development workflowsMentoring fellow engineers and elevating standards for code quality, testing, and implementation

About Us At Konrad Group, we are a pioneering digital consultancy, committed to addressing intricate business challenges for our diverse global clientele. Our team thrives in a culture of innovation, dedicated to developing superior digital products that serve millions of consumers worldwide. We seek exceptionally intelligent, analytical, and diligent individuals who are passionate about lifelong learning. Position Overview As a Full Stack Java Developer, you will engage in the development of web applications using Java and Spring Boot. Collaborating with our software development team, you will contribute to the creation and delivery of both consumer-facing and enterprise applications. This opportunity is perfect for driven developers who are confident in their technical skills and eager to join a highly skilled team at Konrad. Your Responsibilities Develop maintainable, testable, and high-performance software in partnership with our elite team. Engage in code reviews and conduct rigorous testing to guarantee the delivery of high-quality software. Investigate new technologies and tools, sharing insights with the team. Communicate effectively and clearly with all team members.

Join our dynamic team as a Senior Full-Stack Developer, where you will be instrumental in crafting scalable applications and tools that bolster our internal teams. This role emphasizes the integration of AI capabilities into our production systems, guiding projects through all phases of the development lifecycle—architecture, implementation, deployment, and optimization. As a vital member of our multifaceted team, you'll collaborate closely with various departments to deliver high-quality, reliable solutions. This position is perfect for a technology enthusiast who thrives on navigating the evolving landscape of AI technologies in a practical and innovative manner.Lead full-stack development initiatives from conception to deployment, with a strong focus on AI-enhanced functionalities.Work collaboratively with cross-functional teams to identify and integrate AI-driven solutions into existing systems and processes.Design, develop, and maintain both front-end and back-end components, ensuring code quality, scalability, and performance for new developments and existing applications.Participate in code reviews, contribute to architectural decisions, and uphold shared engineering standards.Enhance data integrations, APIs, and tools to streamline and automate workflows.

Join our innovative team at Extreme Networks as a Senior Full Stack Developer specializing in backend technologies such as Java and Python, along with microservices architecture. We are looking for a talented individual who is proficient in modern UI frameworks like Angular and React to contribute to our agile development team.In this pivotal role, you will be tasked with creating robust, scalable, and user-centric end-to-end solutions for Generative AI applications, integrating advanced backend services with seamless front-end interfaces.

Role overview AltaML is looking for a Senior Full Stack Software Engineer in Toronto to design and deliver software solutions that integrate artificial intelligence. The position focuses on using Claude Code, the Claude Agent SDK, and the Claude API as core tools at every stage: from planning architecture for machine learning applications to hands-on development and deployment. Responsibilities span the entire technical delivery process, including work across cloud platforms, APIs, and modern front-end frameworks. What you will do Take the lead on technical delivery for projects, including architecture, coding, and deployment of AI-powered applications. Integrate Claude and agentic coding technologies as central components of software solutions. Balance direct engineering work with architectural decisions and technical leadership. Collaborate with clients and internal teams to turn complex requirements into actionable, AI-enhanced solutions. Mentor developers on applying Claude in daily workflows and contribute to shared internal frameworks. Help shape how new AI engineering tools are evaluated and adopted within the team. Requirements Experience building prototypes with Claude Code and scaling them for production use. Strong understanding of agentic development patterns, such as writing clear specifications for Claude, organizing repositories for AI agents, and reviewing AI-generated code. Ability to communicate effectively with both technical and business teams, translating requirements into AI-driven solutions. Solid problem-solving skills, with the ability to choose between LLM-in-the-loop and traditional engineering approaches as appropriate. Interest in machine learning-driven product development and connecting software engineering with intelligent automation and agentic workflows. Location This position is based in Toronto.

Location: US or CanadaType: US Applicants - Full-Time; Canadian Applicants - Independent Contractor About Human Agency At Human Agency, we are on an exciting journey of rapid growth, seeking outstanding talent in various disciplines to join our innovative team. Our mission is to attract exceptional individuals—from creative visionaries to technical specialists—who can help us navigate this pivotal phase of our development. We pride ourselves on being a team of doers. Leadership is hands-on, collaboration is key, and every team member plays a crucial role in our outcomes. We foster an environment where feedback is welcomed, learning is swift, and excellence is the goal. Here, the merit of an idea takes precedence over titles, as we strive to meet our clients' expectations and deliver remarkable results every time. Our clients’ missions and products are of utmost importance to us. We immerse ourselves in their goals, acting as dedicated partners in addressing significant challenges. Each product we develop, strategy we devise, or asset we create is designed to be both aesthetically pleasing and functional—tailored for real-world impact. Humans are our most vital asset, and we are committed to hiring individuals who drive us forward. Across all areas—strategy, engineering, design, data, and operations—we search for teammates who elevate our standards and contribute to our growth. Our hiring philosophy is simple: always hire those who inspire us. We collaborate with organizations of all sizes to explore, design, and implement AI strategies that are secure, scalable, and centered around human needs. Our belief is that AI should enhance human capabilities, not replace them; we build with this conviction at the forefront of every engagement. From advisory services to practical implementation and training, we partner with clients to integrate AI in ways that align with their values and objectives, enabling teams to work smarter and unlock new possibilities through innovative solutions. Throughout our journey, we lead with purpose, passion, and a sense of adventure. We engage in meaningful work alongside people who inspire us, making the process a rewarding experience. At Human Agency, our identity and our work ethic are intricately linked. The Opportunity Join us at Human Agency as we shape the future by merging advanced AI technologies with exceptional software development. We specialize in creating scalable, secure SaaS applications that empower enterprise clients to tackle complex challenges efficiently. In this role as a Senior Full-Stack Engineer, you will spearhead development initiatives on high-impact projects at the intersection of AI, machine learning, and secure software engineering.