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 modern CSS layout systems (Grid, Flexbox, Custom Properties). Strong understanding of API design principles and frontend state management patterns (Redux Toolkit, Zustand, Jotai, or React Query). Proven experience optimizing both backend service performance (query tuning, caching) and frontend rendering, alongside an understanding of web accessibility standards (WCAG 2.1 AA). Experience writing reliable unit, integration, and end-to-end tests across the entire application stack. 1+ year of professional experience leveraging AI-based workflows to author/review code, and/or building product features that incorporate generative AI/agents. Legally eligible to work in Bulgaria on an ongoing basis. Fluency in English is required Nice to Have: Familiarity with canvas/SVG rendering libraries (Fabric.js, Konva, React Flow) for building highly interactive workflow diagram surfaces. Experience with micro-frontend architectures, module federation, or event-driven backend architectures. Background in drag-and-drop UI frameworks (dnd-kit, react-beautiful-dnd) or custom graph-traversal algorithms on the backend. Relevant cloud certifications (e.g., AWS Certified Developer / Solutions Architect). Smartsheet provides a competitive base salary range for roles that may be hired in different geographic areas we are licensed to operate our business from. Actual compensation is determined by several factors including, but not limited to, level of professional, educational experience, skills, and specific candidate location. In addition, this role will be eligible for a market competitive incentive opportunity. BG Base Salary Pay Range € 58,250 - € 69,750 EUR Get to Know Us: At Smartsheet, your ideas are heard, your potential is supported, and your contributions have real impact. You’ll have the freedom to explore, push boundaries, and grow beyond your role. We welcome diverse perspectives and nontraditional paths—because we know that impact comes from individuals who care deeply and challenge thoughtfully. When you’re doing work that stretches you, excites you, and connects you to something bigger, that’s magic at work. Let’s build what’s next, together. Equal Opportunity Employer: Smartsheet is an Equal Opportunity (EEO) employer committed to fostering an inclusive environment with the best employees. It is our policy to provide equal employment opportunities to all qualified applicants in accordance with applicable laws in the US, UK, Australia, Germany, Costa Rica, Japan, Bulgaria, India, and Singapore. All qualified applicants will receive consideration without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, protected veteran or disabled status, or genetic information. If there are preparations we can make to help ensure you have a comfortable and positive interview experience, please let us know. #LI-Remote