Senior Front-End Engineer & Tech Lead (React + Java Spring)

Avanciers Inc.; Wilmington (DE); On-site; USD 180,000 - 240,000; Full time

Job summary

Avanciers Inc. is seeking an accomplished Senior Front-end Engineer to lead the design and development of modern web experiences using React, with backend work in Java Spring.

You will own front-end architecture, drive performance improvements, and establish coding standards across teams. This role requires 12+ years of experience, fluency with GraphQL/REST, and a track record of delivering scalable UI and microservices.

Qualifications

• 12+ years of professional software engineering experience with strong frontend focus and leadership.
• Expert-level React proficiency (hooks, composition, context, rendering behavior).
• Strong Java and Spring skills to build microservices and API contracts (GraphQL/REST).
• Deep experience with modern frontend tooling (Vite/Webpack, Babel/SWC, npm/pnpm/yarn).
• Advanced testing practices (Jest/Vitest, RTL, Playwright/Cypress).
• Accessibility mastery (WCAG/ARIA, keyboard navigation, screen readers).
• Performance engineering (Core Web Vitals, bundling, caching, SSR/CSR).
• API integration with GraphQL and REST (schema-driven, errors, caching).
• Security awareness (XSS/CSRF, secure auth patterns, OIDC a plus).
• Observability for frontend (logging, metrics, debugging).
• Must: Proficiency using AI-assisted tools (Claude Code, GitHub Copilot).

Responsibilities

• Lead development of complex, user-facing web apps using React and own frontend architecture.
• Develop microservices/API contracts with GraphQL/REST using Java and Spring.
• Establish and evolve frontend standards incl. components, state, routing, testing.
• Drive performance and quality: Core Web Vitals, bundle optimization, caching, observability.
• Implement advanced UI features like rich visuals, real-time updates, offline patterns.
• Ensure secure client-side patterns and secure storage, auth flows, and vulnerability protections.

Skills

React

Java

Spring

GraphQL

REST

Vite/Webpack

Testing

Jest

Accessibility

Performance

Security

AI tools

Next.js

Remix

Design system

Storybook

Micro-frontend

Module federation

OIDC

Tools

Vite/Webpack

npm/pnpm/yarn

Job description

Avanciers Inc. is seeking an accomplished Senior Front-end Engineer to lead the design and development of modern web experiences using React, with backend work in Java Spring.

You will own front-end architecture, drive performance improvements, and establish coding standards across teams. This role requires 12+ years of experience, fluency with GraphQL/REST, and a track record of delivering scalable UI and microservices.