Senior Software Engineer, React - Endpoint State and Control Team

Description

Ninja One is investing in a new Endpoint State and Control team, and we're looking for a Senior Software Engineer, React to help build it from the ground up. This is a true greenfield opportunity — you won't be inheriting years of legacy patterns or untangling technical debt, you'll be in the room helping define the architecture, conventions, and component patterns that the rest of the team will build on.

If you want to make foundational decisions rather than work within someone else's, and you want your fingerprints on a product from its earliest lines of code, this is that role.

You’ll work primarily in React and Type Script, with the freedom to go deep on frontend architecture — component design, state management, testing strategy — while also having real influence over the API contracts your UI depends on. Our engineering team moves fast, experiments with AI tools as part of our everyday workflow, and gives engineers genuine ownership rather than tightly scoped tickets.

If you want to build ambitious, brand-new UI for a product where the stakes (security, trust, scale) are real, and you want a seat at the table when it comes to defining how a feature should work — not just how it should look — this is that role.

Location - We are flexible on remote working from home, if you are located in the USA and reside in one of the following states - CA, CO, CT, FL, GA, IL, KS, MA, MD, ME, NJ, NC, NY, OH, OR, TN, TX, VA, and WA. We have physical offices in Austin, TX and Tampa, FL, if you prefer a hybrid option.

We hire the best software engineers, but experience in our stack can’t hurt:
Ninja One is built on Java, Kotlin, C++, Golang and Postgres; supporting millions of user endpoints and running as a scalable cloud service in AWS. Knowing large-scale datastore bottlenecks, asynchronous application design and client-server architecture will help you.

• Design and build new frontend surfaces for the Endpoint State and Control team from scratch, with real input into architecture, component structure, and conventions from day one
• Lead UI technical design end-to-end for your features — defining API contracts alongside backend engineers, architecting components, and setting the test strategy
• Translate Figma designs into accurate, production-ready UI, while pushing back with informed engineering and UX perspective when a design needs to flex for feasibility
• Write and maintain thorough unit and integration tests (Jest, React Testing Library) as a non-negotiable part of shipping any component
• Help establish the patterns, standards, and shared components that will shape how the Endpoint State and Control team builds going forward
• Partner cross-functionally with backend engineers, designers, and product managers as the team's roadmap and priorities take shape
• Bring AI tools into your day-to-day development workflow and help the team figure out where they genuinely speed things up
• Other duties as needed

• 7+ years of frontend engineering experience, with expert-level React (18+) and Type Script
• A track record building complex, data-driven UI — tables, modals, multi-step forms, or other intricate interfaces — from the ground up
• Experience with React Query (Tan Stack Query) or an equivalent server-state management approach
• Strong testing habits: you write and maintain unit and integration tests (Jest, React Testing Library or similar) as a matter of course, not an afterthought
• Comfortable working from Figma designs with high fidelity, and confident enough in your craft to push back with an engineering or UX rationale when needed
• Experience leading technical design for a feature end-to-end — from API contract through component architecture to test strategy
• Comfortable operating in ambiguity — you enjoy standing up new patterns and making foundational decisions rather than working within an established codebase
• Curious about and comfortable experimenting with AI tools as part of your development workflow

• Experience with Java 11+ or Kotlin (reading and contributing to backend code)
• Experience standing up a frontend codebase or team from scratch
• Familiarity with pnpm monorepos and…