Next Js Developer Jobs in Newark, NJ (NOW HIRING)

Job Summary:
Thrive Mobile is looking for a Senior Frontend Engineer to own the web surfaces that members and operators interact with every day. This role involves contributing to three Next.js applications and collaborating with various teams to translate company goals into user-friendly interfaces.
Responsibilities:
• Contribute hands-on across our three Next.js frontends (member onboarding, BYOD enrollment, admin) while establishing long-term engineering foundations.
• Own development across our core frontend stack: Next.js (App Router, server components, middleware) and React, TypeScript across the application and shared library layer, Sanity CMS for content-driven UI, Auth0 for member and operator authentication.
• Build offline-resilient experiences that hold up on poor or intermittent connectivity — service workers, optimistic updates, retry logic, and graceful degradation are first-class concerns, not polish at the end.
• Drive the architecture of our shared component library so changes propagate cleanly across all three apps.
• Set the standard for performance, accessibility (WCAG 2.1 AA), and UX polish — loading states, error handling, and edge cases are part of the definition of done.
• Author architecture decision records and component guidelines as you go — we believe institutional knowledge belongs in the repo, not in people's heads.
• Partner with product, design, and operations to turn goals into actionable roadmaps.
• Work alongside our backend engineers to design the contracts between frontend and API — you will have a voice in how data flows reach the client.
• Drive UX and engineering decisions that balance speed with the kind of quality our members deserve.
• Set the bar for code review, testing discipline, frontend observability, and release practices as the team grows.
• Improve developer experience across the frontend codebases — linting, formatting, CI/CD, and tooling are part of the role.
• Identify opportunities to streamline how we ship features without compromising reliability.
Qualifications:
Required:
• 3–5+ years building and owning production web applications, with a portfolio of work you can walk us through end to end.
• Deep React and Next.js experience — you have opinions about hooks, server components, routing, middleware, and SSR/ISR patterns, and you can defend them.
• Strong TypeScript fundamentals — types serve the design, not the other way around.
• Proficiency with React, Next.js (App Router), and modern React patterns
• TypeScript across application and shared library code
• Shared component libraries and monorepo tooling (Turborepo, Nx, pnpm workspaces, or similar)
• Tailwind, CSS-in-JS, or modern CSS architecture patterns
• Modern testing tools (Vitest, Playwright, Testing Library)
• Experience building for unreliable networks — service workers, optimistic updates, retry logic, queueing, and graceful offline states.
• Coding standards as a default, not a phase-two — opinionated about linting, formatting, PR review culture, and automated testing.
• Accessibility as a first-class concern — WCAG 2.1 AA is a launch criterion, not a backlog item.
• Ownership-first mindset — you treat the surfaces you build as yours. You see it, you own it, you ship it.
• Ability to balance speed and long-term quality — ship behind flags, measure cycle time, and don't stall releases out of fear.
• Radical candor — direct, specific feedback on PRs and design reviews. Kind but never vague.
• Outcomes over output — you measure success by member impact, not tickets closed.
• Excellent communicator with both technical and non-technical teammates.
• Scrappy, resourceful, and motivated to build quickly.
• Curious, humble, and eager to learn.
• Passionate about serving underserved communities and improving healthcare access through technology.
• Member first, always — every UX decision gets filtered through the question: does this make a member's next interaction with us easier or harder?
Preferred:
• Sanity CMS or headless CMS rendering
• Datadog for frontend observability
• Auth0 on the frontend
• Figma-to-code fluency
• full-stack experience (NestJS, Node.js, Next.js API routes)
• healthcare or regulated-data environments (HIPAA, SOC 2)
Company:
Thrive Mobile is the world's first healthcare-focused mobile company. Founded in 2022, the company is headquartered in Nashville, USA, with a team of 11-50 employees. The company is currently Early Stage.