Senior Fullstack Engineer

Karbon is the global leader in AI-powered practice management software for accounting firms. We provide an award-winning cloud platform that helps tens of thousands of accounting professionals work more efficiently and collaboratively every day. With customers in 40 countries, we have grown into a globally distributed team across the US, Australia, New Zealand, Canada, the United Kingdom, and the Philippines. We are well-funded, ranked #1 on G2, growing rapidly, and have a people-first culture that is recognized with Great Place To Work® certification and on Fortune magazine's Best Small Workplaces™ List.

Karbon is seeking a Senior Fullstack Software Engineer. This is an exciting time to join the team because we are expanding our organization. In this role, you will be working within an agile development team to design and build interactive web applications. They are responsible for technical specifications and developing and deploying software.

• Build and maintain product features -  Develop new functionality and iteratively improve existing systems, with a focus on reliability, performance, and user experience.
• Balance speed and quality -  Know when to move fast and when to slow down, making thoughtful trade-offs to deliver high-quality outcomes.
• Use data to inform decisions -  Learn from user behaviour, experiment thoughtfully including A/B testing where relevant, and help improve acquisition and conversion over time.
• Work effectively as part of a team -  Collaborate closely with engineers and QA throughout the development cycle to build, test, and improve features together
• Use AI tools thoughtfully -  Leverage AI to move faster for example drafting code, exploring solutions, or writing tests, while applying good judgement and always reviewing what ships.
• Work with autonomy -  Take ownership of problems, explore solutions, and ask questions when needed rather than waiting for predefined answers.
• Own your work -  Take pride in what you build and feel accountable for its impact on customers and the business.
• Bring your whole self - Contribute your curiosity, creativity, and personality to a low politics, open, and collaborative team culture.

We know great engineers come from many backgrounds. You don’t need to tick every box below to apply.

• Strong hands-on experience building and maintaining web applications using C#, .NET (MVC, Web API, .NET Core) and JavaScript or TypeScript. Experience with Ember.js is an advantage.
• Provides technical leadership within the team: guiding architectural decisions, raising the bar in code reviews, and ensuring the team is solving the right problems.
• Solid experience with SQL Server or other relational databases, including data modeling and writing efficient queries. Good understanding of data flow across an application.
• Strong understanding of software engineering fundamentals, including scalable systems, API design, and common data structures.
• Experience building across multiple platforms including desktop and mobile applications will be an advantage.
• Experience delivering features end-to-end, from design through implementation, testing, and production support.
• A sense of ownership over your work, with attention to quality, maintainability, and performance.
• Ability to work independently while collaborating closely with others, contributing to design discussions and code reviews.
• Experience mentoring or supporting other engineers is a plus.
• Bachelor’s degree in Computer Science (or similar), or equivalent practical experience.

We build modern, scalable software on a thoughtfully designed stack:

• Frontend: TypeScript and JavaScript across Ember (today), React, and React Native.
• Backend: .NET / C# (Web API, .NET Core) powering distributed services.
• Data: SQL Server with performance and integrity at scale.
• Cloud: Microsoft Azure.
• Observability: Metrics, logging, alerting, and dashboards in Datadog — because we believe you can’t improve what you don’t measure.

Our architecture continues to evolve as we scale. We invest in event-driven systems, well-defined microservices, and containerized deployments (Azure Container Apps) to build resilient, decoupled, and high-performing software.

If you care about clean service boundaries, reliable systems, and shipping with confidence — you’ll feel right at home here.

Engineers are expected to balance delivery speed with a strong commitment to quality, meeting agreed timelines while producing reliable, maintainable, and well-tested solutions. Sound judgment in making trade-offs between velocity and long-term sustainability is essential.

Engineering is collaborative by default. Team members are expected to contribute constructively in design discussions, reviews, and planning, communicate clearly about progress and risks, and support shared team outcomes in both hybrid and distributed environments.

Engineers are responsible for building new capabilities while maintaining and improving existing systems. This includes designing scalable solutions, reducing technical debt, supporting operational stability, and contributing to continuous improvement.

A high degree of autonomy is expected. Given clear objectives, engineers should independently translate problems into actionable technical approaches, proactively identify improvements, and continuously expand relevant technical expertise.

Ownership is fundamental. Engineers are accountable for the quality, performance, and customer impact of their work from design through post-release support, and are expected to follow through on commitments.

AI is reshaping how software is built, and we are committed to leveraging it as a force multiplier for creativity, impact, and capability. Engineers are expected to confidently apply strong technical fundamentals while embracing AI tools and approaches to enhance productivity, problem-solving, and innovation. Curiosity, adaptability, and enthusiasm for integrating AI into meaningful product development are essential.

Engineers contribute positively to a culture of professionalism, transparency, low bureaucracy, and mutual respect, strengthening team performance through authenticity, curiosity, and collaboration.