Senior Full Stack Engineer

🕒 February 27

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Sema4.ai

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2024

🤖 Artificial Intelligence

🏢 Enterprise

☁️ SaaS

💰 $25M Series A - Sema4.ai on 2025-06

Artificial Intelligence • Enterprise • SaaS

Sema4. ai is an enterprise AI agent platform that enables organizations to build, run, and scale secure, governed AI agents to automate complex data- and document-centric workflows. Its product suite (Studio, Control Room, Work Room, SDK) integrates with enterprise LLMs, cloud environments (AWS, Snowflake), and business systems (ERPs, CRMs) to support use cases like invoice reconciliation, receivables matching, and regulatory compliance. The company positions itself as a SaaS provider for enterprises seeking observability, security, and low-code/no-code tools to deploy AI agents at scale.

📋 Description

• Lead UI feature development end-to-end: define approach, design component structure, implement flows (navigation, forms, data-heavy screens), and ship polished interactions. • Drive UX quality: propose UX improvements, spot inconsistencies, raise the bar on micro-interactions, and ensure a cohesive experience across the product. • Build reusable components and patterns that scale (design system contributions, shared utilities, consistent UX). • Integrate with APIs (REST + RPC/typed APIs such as tRPC): loading states, error handling, caching, retries, pagination, and optimistic updates where appropriate. • Own client-side state strategy (local vs server state, derived state, performance considerations). • Ensure quality and reliability with automated tests, code review, and strong typing. • Own UI performance and accessibility: responsive design, a11y best practices, rendering performance, and maintainable styling. • Implement or extend API routes/procedures and input validation. • Work with authentication/session concepts and authorization-aware UX. • Debug issues spanning frontend ↔ backend ↔ network. • Mentor engineers, set patterns, and improve team velocity through thoughtful reviews and documentation. • Identify and execute refactors that improve maintainability without disrupting delivery. • Partner with design/PM/engineering to clarify requirements and deliver iteratively.

🎯 Requirements

• Strong experience building production web UIs with a modern component-based framework (e.g., React). • Excellent UX judgment: you can spot issues in flows and visual hierarchy, and you sweat the details (usability, consistency, accessibility). • Strong TypeScript/JavaScript fundamentals (types, async, functional patterns, maintainable code). • Solid API integration skills: request/response modeling, error handling, caching strategies, and secure client behavior. • Comfort with frontend architecture: routing, shared component libraries, state patterns, and incremental refactors. • Testing mindset: ability to write and maintain unit/integration tests and prevent regressions. • Pragmatic full-stack ability: comfortable reading and making small changes in backend code to support frontend features. • Advanced knowledge of AI tooling: Cursor, Claude Code, Codex

🏖️ Benefits

• Hybrid work model