We are looking for a passionate and experienced Senior Software Engineer to join our Workflow Builder UI pillar. In this role, the successful candidate will be the primary crafter of our next-generation drag-and-drop workflow experience — the visual layer that thousands of teams rely on to design, configure, and automate their processes. This position will shape every pixel and interaction, working at the intersection of high-performance rendering, rich component design, and developer experience. This is an opportunity to build a product that end-users see and touch every single day, deeply integrating modern React patterns, leading UI component libraries, and — as a nice-to-have — MCP UI tooling to accelerate development velocity.

You will work remotely from Bulgaria and will be reporting to an engineering leader.

You Will:

• Architect, build, and iterate on the Workflow Builder front-end, delivering a performant, accessible, and polished drag-and-drop editing experience that end-users rely on daily — requiring sustained concentration, independent judgement, and a high bar for UX quality throughout the full development lifecycle.
• Drive component design, layout systems, and interaction patterns that scale across Smartsheet's enterprise customer base, championing visual precision and consistency at every stage.
• Build production-grade features using React (v18+), leveraging hooks, context, concurrent rendering, and Suspense for advanced UI behaviours, and evaluate new React capabilities and ecosystem tooling to improve developer productivity and user experience.
• Integrate and extend component libraries (such as MUI, Radix UI, Shadcn/ui, or internal design system components) to create a consistent, reusable UI language across the product, maintaining and documenting component standards for use by the broader engineering team.
• Develop scalable back-end services and APIs with a security-first mindset, ensuring high availability and performance in a multi-cloud environment (primarily AWS), and create and maintain API integrations between internal and external systems to meet functionality, performance, and security standards.
• Participate in architectural discussions and code reviews, advocating for front-end best practices including code splitting, memoisation strategies, accessibility (WCAG AA), and performance budgets, and define front-end coding standards, patterns, and automated testing strategies across the pillar.
• Write comprehensive unit and integration tests using Jest, Cypress, and Playwright within a strong culture of test-driven development and visual regression coverage, and monitor front-end performance metrics — including Core Web Vitals, bundle size, and rendering throughput — to identify bottlenecks and drive measurable improvements.
• Partner with UX designers to translate wireframes and prototypes into refined, fully accessible UI components, communicating clearly across design, product, and engineering stakeholders throughout the process.
• Serve as a UI subject matter expert for the team, mentoring junior and mid-level engineers on React best practices, component design, and scalable state management, and contribute to technical roadmap planning and effort estimation for UI-heavy features, surfacing risks and tradeoffs to engineering leadership.
• Champion the use of AI-assisted development tools (such as GitHub Copilot, Claude, and Cursor) within the team to accelerate feature development and code quality, and build and evaluate AI-powered features in the Workflow Builder that leverage generative AI or agentic workflows to deliver measurable customer value.
• Handle sensitive technical and product information — including internal architecture documentation, API specifications, and customer-facing workflow configurations — with appropriate confidentiality and in line with Smartsheet's data handling standards.
• Manage competing priorities across multiple workstreams, planning and sequencing individual and team deliverables to meet sprint and roadmap commitments.
• Perform standard computer and keyboard use in a remote working environment, with standard sedentary work involving extended screen use.
• Work within a psychologically safe, inclusive team environment, demonstrating resilience when navigating ambiguity, managing complexity under pressure, and contributing to a culture of respect and belonging.

You Have:

• 5+ years of professional front-end software engineering experience with a strong focus on UI/UX-facing product work, demonstrating depth of expertise across the full front-end development lifecycle.
• Proficiency in React (v17+), including hooks, context API, concurrent features, and performance optimisation techniques such as memoisation, virtualisation, and profiling, combined with working knowledge of at least one major back-end programming language such as Java, Kotlin, Go, or Python, with a proven history of building scalable and secure applications.
• Deep experience with TypeScript, HTML5, and CSS3, including CSS custom properties, CSS Modules, Grid, and Flexbox.
• Hands-on experience integrating and customising UI component libraries such as MUI, Radix UI, or Shadcn/ui, and/or contributing to an internal design system.
• Strong understanding of state management patterns — including Redux Toolkit, Zustand, Jotai, or React Query — and the analytical capability to determine when to apply each in complex application scenarios.
• Proven experience building accessible UIs to WCAG 2.1 AA compliance standards, with a genuine understanding of why accessibility matters to diverse user populations.
• Demonstrated track record of optimising front-end performance through code splitting, virtual scrolling, React.memo and useMemo tuning, bundle analysis, and memory profiling.
• Experience with modern front-end testing frameworks including Jest, Cypress, Playwright, or Storybook visual regression testing.
• Excellent verbal and written communication skills in English, with a proven ability to collaborate effectively across design, product, and engineering stakeholders, including clear documentation and reporting of technical decisions.
• 1+ year of professional experience leveraging AI-based workflows to author, review, and maintain code.
• 1+ year of experience building AI-augmented product features that incorporate generative AI or agentic workflows to solve real customer problems.
• Ability to plan and independently manage multiple workstreams with competing priorities, exercising sound organisational judgement to meet deadlines and surface risks proactively to leadership.
• Comfort working with ambiguity and evolving requirements in a fast-paced environment, maintaining quality and focus under pressure across concurrent initiatives.
• No direct budget ownership is required for this role; however, awareness of engineering cost implications — such as infrastructure choices and tooling decisions — is expected when contributing to architectural discussions.
• Legally eligible to work in Bulgaria on an ongoing basis.
• Fluency in English is required.

Nice to have:

• Experience with MCP UI tooling or Model Context Protocol integrations in front-end workflows
• Familiarity with canvas or SVG rendering libraries such as Fabric.js, Konva, React Flow, or custom WebGL/Canvas 2D for building interactive workflow diagram surfaces
• Exposure to micro-frontend architectures and module federation in large-scale React applications
• Background in drag-and-drop UI frameworks such as dnd-kit, react-beautiful-dnd, or interact.js
• Advanced certifications in front-end development such as Google UX Design or AWS Certified Developer, or relevant open-source contributions.

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.

Bulgaria Base Salary Pay Range
€58,250 - €69,750 EUR