Fullstack Engineer

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Karbon is seeking a Mid-Level Fullstack Software Engineer to join the Sydney onsite team to design and ship web applications in an agile environment. You’ll build and maintain features focused on reliability, performance and user experience, balance speed with quality, and use data to inform decisions. Core tech: C# and .NET (MVC Web API .NET Core), TypeScript/JavaScript, SQL Server, Azure; frontend Ember and React. You’ll work autonomously, own your outcomes, and thoughtfully apply AI tools while collaborating with engineers and QA. Tips: tailor your CV to show end-to-end delivery, cloud and database experience, measurable impact, and teamwork; highlight ownership and curiosity; indicate willingness to work onsite in Sydney and alignment with Karbon’s inclusive culture.

Karbon is seeking a Mid-Level 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.

Key Responsibilities

• 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.

Qualifications:

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

• Hands-on experience building web applications using C#, .NET (MVC, Web API, .NET Core a plus) and JavaScript or TypeScript
• Familiarity with SQL Server or relational databases, and an understanding of how data flows through an application
• A growing understanding of software fundamentals like scalable systems, APIs, and basic data structures
• Experience building across multiple platforms including desktop and mobile applications will be an advantage.
• Curiosity and problem-solving skills- you enjoy figuring things out and learning as you go
• A sense of ownership and pride in your work, balanced with a willingness to ask questions and accept feedback
• An interest in building customer-facing software and thinking about how real people use what you build
• Comfortable working with others - sharing ideas, giving and receiving feedback, and learning together
• A degree in Computer Science (or similar), or equivalent practical experience

Our Core Technology Stack!

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.

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

Our Engineering Standards

Balance Speed and Quality

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.

Collaborate Effectively

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.

Build and Maintain Systems

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.

Operate with Autonomy

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 and Accountability

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-Enabled Engineering

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.

Contribute to Team Culture

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