Senior Fullstack Engineer

About Karbon

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 Full Stack Software Engineer

to join the team working on

Aider

, a product within the Karbon portfolio. This is a distinct engineering role with a different tech stack and problem space from Karbon’s core platform. You’ll work in an agile, product-focused team to design, build, and evolve highly interactive web applications. This role is frontend-led, with full-stack ownership and \~20% focus on backend/API work, primarily using Node.js. You’ll have strong autonomy, real product ownership, and the opportunity to influence how modern engineering practices—including AI-assisted development—are applied within Aider.

About the Role!

Product \& Engineering Execution

Design, build, and maintain high-quality, customer-facing web applications using React and TypeScript, with a strong emphasis on frontend experience and performance.

Develop and maintain backend services and APIs using Node.js, contributing to data flows, integrations, and platform reliability (\~20% of scope).

Translate product requirements into clear technical designs, balancing speed, quality, and long-term maintainability.

Own features end to end—from discovery and implementation through deployment, monitoring, and iteration.

User Experience \& Growth

Optimize user experiences through thoughtful UI/UX decisions, performance improvements, and frontend architecture.

Use experimentation techniques such as A/B testing, feature flags, and funnel analysis to improve acquisition, activation, and retention.

Study user behavior data to identify opportunities for improvement and refinement across the product.

Quality, Collaboration \& Ownership

Work closely with QA, Product, and Design to ensure features are well-tested, reliable, and meet user expectations.

Participate actively in code reviews, technical discussions, and architectural decisions.

Take ownership of existing systems as well as new development, making iterative improvements to keep the product healthy and scalable.

Collaborate effectively with a distributed, international engineering team in a low-politics, high-trust environment.

AI, Automation \& Modern Engineering Practices

Leverage AI-assisted development tools (e.g. for code generation, refactoring, testing, and documentation) to improve development velocity and code quality.

Identify opportunities to automate repetitive engineering tasks and improve workflows across development, testing, and deployment.

Apply AI-enabled insights responsibly when analyzing user behavior, experiments, or product performance.

About You!

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

3+ years of professional experience in full-stack software development, with a strong frontend focus.

Advanced proficiency in React and modern frontend patterns.

Experience using TypeScript across frontend and backend codebases.

Hands-on experience building APIs and services with Node.js.

Working knowledge of state management libraries such as MobX (or similar).

Experience with PostgreSQL or similar relational databases.

Familiarity with microservices architectures and distributed systems.

Experience with containerization technologies such as Docker and Kubernetes.

Strong understanding of software engineering best practices across the full SDLC (testing, CI/CD, monitoring).

Product \& Growth Mindset

Experience with feature flags, experimentation, and data-driven iteration.

Strong analytical and problem-solving skills, especially when working with ambiguous product challenges.

Passion for understanding user behavior and building software that anticipates user needs.

Ways of Working

Comfortable working autonomously with high ownership and accountability.

Strong communication and collaboration skills for working across time zones and disciplines.

Takes pride in craftsmanship and feels genuine ownership over the impact of their work.

Curious, creative, and excited about building consumer-facing software used globally.

Education

Bachelor’s degree in Computer Science, Mathematics, Statistics, Data Science, or equivalent practical experience.

Why Work at Karbon?

Gain global experience across the USA, Australia, New Zealand, UK, Canada and the Philippines

4 weeks annual leave plus 5 extra "Karbon Days" off a year

Flexible working environment

Work with (and learn from) an experienced, high-performing team

Be part of a fast-growing company that firmly believes in promoting high performers from within

A collaborative, team-oriented culture that embraces diversity, invests in development, and provides consistent feedback

Generous parental leave

Karbon embraces diversity and inclusion, aligning with our values as a business. Research has shown that women and underrepresented groups are less likely to apply to jobs unless they meet every single criteria. If you've made it this far in the job description but your past experience doesn't perfectly align, we do encourage you to still apply. You could still be the right person for the role!

We recruit and reward people based on capability and performance. We don’t discriminate based on race, gender, sexual orientation, gender identity or expression, lifestyle, age, educational background, national origin, religion, physical or cognitive ability, and other diversity dimensions that may hinder inclusion in the organization.

Generally, if you are a good person, we want to talk to you. 😛

If there are any adjustments or accommodations that we can make to assist you during the recruitment process, and your journey at Karbon, contact us at people.support@karbonhq.com for a confidential discussion.

At this time, we request that agency referrals are not submitted for this position. We appreciate your understanding and encourage direct applications from interested candidates. Thank you!