Full-Stack Engineer at Merge API Integration Sandbox | Toronto

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.

At ZoomInfo, we are where careers take off. We thrive in a fast-paced environment that encourages bold thinking and empowers you to deliver your best work. Join a team that values deep connections, challenges conventional thinking, and celebrates achievements together. With cutting-edge tools that enhance your impact and a culture that supports your aspirations, you will not only contribute—you will drive results swiftly.As a Senior Full Stack Engineer on the Chorus Engagement team, you will play a pivotal role in Chorus.ai, our renowned Conversation Intelligence platform. Chorus processes and analyzes a vast array of sales calls, providing insights that empower sales professionals to excel and compete at the highest levels. You will oversee customer-facing product areas ranging from AI-enhanced tools to advanced data visualizations, architecting solutions capable of managing millions of customer requests daily.Whether your strengths lie in frontend or backend development, your expertise and willingness to learn will find ample opportunity here. You will collaborate with exceptionally talented engineers who will inspire you to reach new heights, all while pursuing ambitious goals that truly make a difference.

Join Feathery as a Full Stack EngineerAt Feathery, we revolutionize data intake workflows for insurance and wealth management sectors. Top industry players depend on us to streamline critical operations such as underwriting, client onboarding, and automated account openings.With our rapid revenue growth and increasing enterprise demands, we're expanding our engineering team to tackle more complex, data-intensive workflows across our innovative platform.Your RoleAs we grow, the intricacies of our backend systems and the sophistication of our frontend experiences are evolving. We are seeking a Full Stack Engineer to develop and scale our core product capabilities from end to end. This position is perfect for someone passionate about owning features across the entire stack—from API design and backend development to creating intuitive, high-performance user interfaces.You will partner closely with product management, design, and engineering teams to deliver impactful features and influence the overall architecture of our platform.Key ResponsibilitiesEnd-to-End Product DevelopmentDesign and implement features across both frontend and backend systems.Create APIs and services that drive essential product functionality.Develop intuitive, responsive, and high-performance user interfaces.Manage features from inception to production.Backend Systems & InfrastructureBuild and scale backend services for workflow automation and data processing.Develop asynchronous pipelines and distributed systems for managing large data volumes.Utilize AWS services and messaging systems (e.g., SQS) to ensure scalable infrastructure.Maintain reliability, performance, and observability across systems.Frontend Experience & PerformanceImplement UI/UX designs that enhance user experience.Optimize front-end performance to ensure quick and smooth user interactions.

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.

At Veeva Systems, we are dedicated to revolutionizing the life sciences industry by accelerating the process of bringing therapies to patients. As a trailblazer in the industry cloud sector, we proudly stand as one of the fastest-growing SaaS companies, achieving over $2 billion in revenue last year and poised for remarkable growth in the years ahead.Our core values drive us forward: Do the Right Thing, Customer Success, Employee Success, and Speed. In 2021, we made history by becoming a public benefit corporation (PBC), emphasizing our commitment to balance the interests of our customers, employees, society, and investors.As a Work Anywhere organization, we prioritize your flexibility to thrive, whether you choose to work from home or in our office.Join us in transforming the life sciences sector, where our commitment to positive impact resonates through our customer relationships, employee satisfaction, and community involvement.The RoleWe are actively seeking multiple skilled Full Stack Software Engineers to develop innovative solutions in the life sciences realm. You will leverage cutting-edge front-end and back-end technologies to tackle some of the most significant challenges of our time.The ideal candidates will thrive in a dynamic startup atmosphere while enjoying the stability of a successful, profitable company. You should possess extensive expertise in Java and JavaScript applications and be well-versed in the latest open-source technologies. Experience in enterprise software development or with high-growth tech firms is highly desirable.

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.

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.

Join Stripe as a Full Stack Engineer specializing in billing solutions. In this role, you will be pivotal in designing, developing, and enhancing our billing systems. You will collaborate with cross-functional teams to create user-friendly interfaces and robust backend services. Your contributions will directly impact our mission to simplify payments and empower businesses globally.

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.

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

Join Our Team as a Full Stack EngineerAt Vantage Analytics, we are seeking a passionate Full Stack Engineer to become an integral part of our Product Development Team. In this role, you will leverage your expertise across the technology stack to develop and maintain high-performance, scalable systems that enhance our platform's core functionalities. Collaborating closely with fellow engineers and product managers, you will be responsible for delivering features that are not only technically sound but also centered on user experience. If you share our enthusiasm for the transformative power of exceptional software, we want to hear from you!This is a newly created position, providing a unique opportunity to influence our product direction.

Who We Are: Founded in 2001, Vivid Seats (NASDAQ: SEAT) is a premier online ticket marketplace dedicated to connecting fans with the live events, artists, and teams they cherish. We understand that experiences matter and are committed to creating products that foster genuine human connections. Recognized as one of Built In's top workplaces of 2025, we believe our people are our strongest asset. Our company culture promotes empowerment, encourages collaboration, and embraces innovation by leveraging data to continuously evolve.At Vivid Seats, we harness cutting-edge technology to enhance performance and ignite creativity. We are committed to utilizing AI tools to improve decision-making, streamline workflows, and produce superior outcomes for our customers.

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.

Join Veeva Systems, a pioneering force in the cloud technology space, dedicated to accelerating the delivery of life-saving therapies to patients. As one of the fastest-growing SaaS companies, we achieved over $2 billion in revenue last fiscal year, showcasing our immense growth potential.At Veeva, our core values drive us: We prioritize doing the right thing, ensuring customer and employee success, and maintaining a rapid pace of innovation. In 2021, we made history by becoming a public benefit corporation (PBC), committed to balancing the needs of our customers, employees, society, and investors.We embrace flexibility with our Work Anywhere policy, allowing you to choose the environment that helps you perform your best.Be a part of our mission to transform the life sciences industry and make a meaningful impact on customers, employees, and communities.The RoleWe are actively seeking several skilled Full Stack Software Engineers to join our team and develop cutting-edge products in the Life Sciences sector. You will engage with the latest front-end and back-end technologies while addressing some of the most pressing challenges facing the industry today.Ideal candidates will thrive in a dynamic, fast-paced environment, enjoying the stability of a successful and profitable organization. You should have substantial experience in Java and JavaScript applications, along with familiarity with the latest open-source technologies. Experience in enterprise software development or a high-growth tech firm is preferred.

Feathery is looking for an entry-level Full Stack Engineer to join the team in Toronto. This role offers a chance to work on products that make a real impact for insurance and wealth management clients. About Feathery Feathery helps insurance and wealth management companies manage data intake more efficiently. Many leading firms rely on Feathery to handle critical processes like underwriting, client onboarding, and automated account openings. With revenue climbing and more enterprise customers coming on board, Feathery is growing its engineering team to support ambitious product and market goals. Why This Role As Feathery expands, both the backend systems and the frontend experience are becoming more advanced. The team is searching for a Full Stack Engineer who wants to take ownership of features throughout the stack. This includes everything from designing APIs and backend logic to building user-friendly, high-performance interfaces. Working closely with product, design, and engineering colleagues, this engineer will help deliver features that shape the future of the platform. Role Overview Work on both frontend and backend product development Design systems and develop APIs Implement user interfaces with a focus on performance and usability Collaborate across teams, especially with product and design This position offers the chance to understand the bigger picture of system architecture while also focusing on delivering polished product experiences. What You’ll Do Full Stack Product Development Design and build features on both the frontend and backend Create APIs and backend services that power core product features Develop responsive, efficient user interfaces Take features from concept through to production launch Backend Systems & Infrastructure Develop and scale backend services for automating workflows and processing data This role is based in Toronto and is ideal for someone early in their engineering career who wants to grow by taking on meaningful product work.

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.

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.

Join Ideogram as a Full Stack Product EngineerAt Ideogram, we are on a mission to democratize world-class design, enhancing human creativity through innovative solutions. Our proprietary generative media models and AI-driven creative workflows address significant challenges in graphic design. Our talented team comprises industry pioneers who have contributed to breakthroughs in technologies like Diffusion Models and Google’s Imagen and Imagen Video. We are passionate about combining design, taste, and craftsmanship with cutting-edge research and engineering, delivering experiences that creatives adore.With nearly $100M in funding from top investors like Andreessen Horowitz and Index Ventures, and a headquarters in Toronto alongside a growing presence in NYC, we are expanding rapidly, with goals to triple our team within the next year. We foster a flat organizational structure that encourages ownership, collaboration, and mentorship.About The RoleAs a Full Stack Product Engineer, you will play a crucial role in developing products that empower creators by seamlessly integrating generative AI into their workflows. You will engage with all facets of product development, from designing engaging user experiences to optimizing backend systems that cater to millions. We seek a candidate who possesses a strong product instinct, user empathy, and the ability to thrive in the fast-evolving AI landscape.