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About the Role

We are seeking a Senior Software Engineer to take ownership of product capabilities, from the data model to the final user interaction. This role is frontend-focused, involving approximately 70% TypeScript and React work and 30% Python and backend tasks, with variations depending on the project. Responsibilities include developing features from conception to production, managing complex user experiences, designing supporting data models and APIs, and enhancing browser integrations and design systems.

Responsibilities

Lead substantial product features from discovery and technical design through implementation, rollout, instrumentation, and iteration.
Build complex, responsive product experiences with React, TypeScript, Next.js, and TanStack Query.
Design the endpoints, data models, queries, and migrations that support those experiences.
Evolve our Chrome extension and document integrations across Google Docs, Word Online, and other enterprise authoring environments.
Improve our shared design system while treating accessibility, keyboard behavior, and focus management as product requirements.
Build interfaces for asynchronous and LLM-powered workflows, including streaming results, partial failures, retries, and long-running operations.
Maintain strong automated coverage with Vitest, Testing Library, and Playwright, including end-to-end tests against third-party applications.
Use instrumentation and evidence to diagnose production behavior, including failures caused by upstream applications we do not control.
Write concise design documents or ADRs when a decision affects multiple systems, packages, or teams.
Raise the engineering bar through thoughtful reviews, pairing, and improvements to shared foundations.

Requirements

Deep experience building production applications with React and TypeScript.
Strict TypeScript habits and clear, well-reasoned views about component boundaries, state, data flow, and API design.
Experience with client data layers, including cache-key design, invalidation, optimistic updates, and failure recovery.
A history of shipping features across the stack, including schema design, API exposure, interface building, and production service operation.
Experience building enterprise software involving multi-tenancy, roles and permissions, administration, organization-level settings, onboarding, or customer reporting.
Strong testing habits and experience treating accessibility as part of implementation.
Strong debugging abilities: working with traces, logs, product analytics, and debugging in third party applications.
The ability to scope ambiguous work, communicate tradeoffs, and take responsibility for quality after launch.

Skills

React
TypeScript
Next.js
TanStack Query
Vitest
Testing Library
Playwright
Python
FastAPI
Temporal
ClickHouse

Location

Florida
Georgia
Indiana
Massachusetts
New Jersey
New York
North Carolina
Pennsylvania

Work Type

Full-time

Experience Level

Senior
Six or more years in professional software development

About the Company

Markup AI is pioneering the AI content governance category with the industry's first Content Guardian Agents™—AI-powered agents that automatically scan, score, and rewrite content to ensure it meets brand, compliance, terminology, and quality standards before it goes live.
Purpose-built for AI-first marketing and content teams, Markup AI integrates directly into LLMs, CMS platforms, and enterprise workflows through its API- and MCP-first architecture, giving organizations the confidence to scale AI-generated content without sacrificing quality, consistency, or trust.
Backed by decades of expertise in enterprise content governance, Markup AI is helping leading global brands publish faster, safer, and with confidence.