Sr. Software Engineer I (Remote Eligible in Bulgaria)

For over 20 years, Smartsheet has empowered teams to manage work seamlessly and scale solutions smarter. Now, in our most ambitious chapter yet, we are uniting human teams with AI agents. By orchestrating the work agents do best, automating manual tasks and uncovering insights at scale, we create the space for people to focus on what truly matters: judgment, creativity, and big thinking. That is magic at work, and it’s what we show up for every day. We are looking for a passionate and experienced Senior Software Engineer to join our Workflow Builder pillar. In this role, you will be a key architect of our next-generation drag-and-drop workflow experience—balancing a highly interactive visual layer with the robust, scalable back-end systems that thousands of teams rely on to automate their enterprise processes. You will work at the intersection of high-performance UI rendering, scalable API design, and distributed systems architecture. This is your opportunity to build an end-to-end product that users touch every day, deeply integrating modern React patterns, cloud-native services, and cutting-edge AI orchestration. You will work remotely from Bulgaria and will be reporting to an engineering leader. You Will: Architect End-to-End Workflow Systems Own, build, and iterate on the Workflow Builder across the entire stack, ensuring a seamless connection between frontend interactions and backend execution. Drive system design, data modeling, and API contracts that allow our drag-and-drop editor to scale effortlessly for enterprise workloads. Participate in cross-functional architectural discussions, advocating for engineering best practices across both front-end and back-end ecosystems. Advance our Front-End Architecture Build production-grade visual features using React (v18+), leveraging advanced state management, concurrent rendering, and performance tuning (virtualization, code-splitting). Integrate and extend modern component libraries (e.g., MUI, Radix UI, Shadcn/ui) to ensure a consistent, highly accessible (WCAG AA) user experience. Build Scalable and Secure Back-End Services Develop high-availability, secure back-end services and microservices within our multi-cloud environment (primarily AWS). Design, implement, and maintain highly performant REST or GraphQL APIs, optimizing for low latency, secure data transit, and system resilience. Define and uphold coding standards, database optimization strategies, and automated testing patterns (unit, integration, and E2E) across the pillar. Deliver High Quality at Scale Monitor and optimize full-stack performance metrics—balancing frontend Core Web Vitals with backend API latency, throughput, and resource utilization. Write comprehensive test suites (Jest, Cypress, Playwright, and backend integration testing frameworks) with a strong culture of test-driven development. Partner closely with UX designers and Product Managers to translate complex workflows into technical realities. Mentor & Lead Serve as a technical mentor for junior and mid-level engineers, hosting code reviews and evangelizing clean code principles across the entire stack. Contribute to technical roadmap planning, providing accurate effort estimations and surfacing architectural risks or tradeoffs. Strategically Apply AI Tools Champion the use of AI-assisted development tools (GitHub Copilot, Claude, Cursor, etc.) to accelerate engineering velocity and code quality. Build and evaluate AI-powered features within the Workflow Builder that leverage generative AI or agentic workflows to deliver unique customer value. You Have: 5+ years of professional software engineering experience, with a proven track record of shipping production-grade full-stack web applications. Deep experience in at least one major back-end language (such as Java, Kotlin, Go, or Python) alongside experience designing relational/non-relational databases and distributed cloud architectures (AWS). Proficiency with React (v17+), TypeScript, HTML5, and…