Senior Backend Engineer

About Kintsugi Kintsugi is solving sales tax compliance for founders, finance, and accounting teams scaling across multiple states and countries. Our mission is to eliminate the complexities of sales tax through automation, AI, and deep integrations with leading billing, commerce, and accounting platforms. Backed by top investors, Kintsugi is scaling fast, and we’re looking for a Senior Backend Engineer to help us build a world-class tax automation platform.

Role Overview As a Senior Backend Engineer at Kintsugi, you will be a key contributor to our core infrastructure and backend services. You will work on designing, developing, and optimizing our APIs, data processing systems, and integrations with third-party platforms. This is a high-impact role for an experienced engineer who thrives in fast-paced environments, takes ownership, and enjoys solving complex technical challenges.

Responsibilities

Backend Development & Architecture

• Design and build scalable, high-performance backend services and APIs. • Develop and maintain robust, fault-tolerant data processing pipelines. • Ensure the security, reliability, and performance of our backend infrastructure. • Optimize database schemas and queries for efficiency and scalability. • Write clean, maintainable, and well-documented code that follows industry best practices.

Systems Integration & Scalability

• Develop and maintain integrations with third-party billing, commerce, and accounting platforms. • Work with serverless…