Sr. Software Development Engineer

What You'll Do

Join Avalara’s engineering team and help shape the future of Avalara. In this role, you'll work on a high-volume tax compliance product used by thousands of customers, contributing to both the evolution of our existing Ruby on Rails and PostgreSQL platform and the expansion of new API and user interface capabilities using C# and React.

As a Senior Software Engineer, you'll be part of a collaborative, international engineering organization, working closely with a U.S.

-based team to deliver scalable, secure, and high-performing solutions. You'll leverage modern cloud technologies, CI/CD practices, containerized environments, and AI-powered development workflows to build and enhance customer-facing products.

We're looking for an engineer who enjoys solving complex problems, writing clean and efficient code, and continuously raising the technical bar. Success in this role requires strong collaboration, a growth mindset, and a passion for improving systems, processes, and team effectiveness. You'll have the opportunity to influence architecture, mentor peers, drive operational excellence, and help advance the use of AI to accelerate development, troubleshooting, and innovation across the organization.

This is an excellent opportunity for someone who thrives in a fast‑paced, entrepreneurial environment and wants to make a meaningful impact on a product that plays a critical role in tax and information reporting compliance.

We expect every engineer, manager, and lead to use AI to enhance productivity, quality, innovation, and customer value. AI is embedded in our workflows, decision‑making, and products - and success at Avalara requires embracing AI as an essential capability, not an optional tool.

We are hiring a Bar Raiser - someone who elevates the performance, standards, and technical capability of the teams they work with. This role is expected to strengthen how complex technical issues are resolved by improving execution quality, troubleshooting rigor, and overall team effectiveness.

• Raise standards for technical troubleshooting, root cause analysis, and resolution quality.
• Improve team capability through mentorship, knowledge sharing, and clear documentation.
• Reduce repeat issues by driving systemic fixes and improving diagnostic approaches.
• Strengthen cross‑functional execution by improving clarity and collaboration with Engineering and Product.
• Identify opportunities to improve processes, tools, and workflows that increase scalability and efficiency.
• Leave systems, documentation, and team capability stronger than they found them.

We are hiring an AI Bar Raiser - someone who brings applied AI expertise to improve how technical support work is performed. This role is expected to elevate how AI is used across the team to drive faster resolution, better diagnostics, and more consistent, high‑quality customer outcomes.

• Use AI tools to accelerate development, root cause analysis, summarize case histories, and generate high‑quality knowledge base content.
• Identify automation opportunities that reduce manual troubleshooting effort.
• Quantify and demonstrate measurable improvements enabled by AI (e.g., reduced resolution time, improved documentation quality).
• Share AI best practices with peers and contribute to raising AI capability across the team.

• Design, develop, test, and maintain scalable software solutions that support Avalara’s 1099 product suite.
• Deliver high‑quality, reliable code to large‑scale production environments while adhering to engineering best practices.
• Collaborate with product managers, engineers, and stakeholders to define requirements and deliver customer‑focused solutions.
• Participate in architecture and design discussions, evaluating trade‑offs and recommending scalable, maintainable solutions.
• Optimize application performance, reliability, and operational efficiency through thoughtful design and continuous improvement.
• Troubleshoot and resolve complex production issues, leveraging strong debugging and problem‑solving skills.
• Work with relational databases, including designing and…