Senior Frontend Developer

Sonata Software, with over $1.2 Billion Revenue, is a leading AI-first Modernization Engineering company, powered by our unique PlatformationTM framework. Our 6400 AI Engineers are helping enterprises transform from systems to intelligent business platforms leveraging partner ecosystem to drive speed, efficiency and growth. Our bouquet of Modernization Engineering Services with AI -first approach cuts across Cloud, Data, AI, Dynamics, Test Automation, and Managed Services.

Sonata’s AI-led modernization is enabled by a powerful suite of proprietary tools and assets. At the core is the Harmoni.AI Enterprise Platform, which includes Agent Bridge-a governance and observability framework; Agent Builder-a development toolkit for fungible agents integrated into enterprise systems; and the Agent Marketplace-an internal ecosystem for modular, reusable agents.

Headquartered in Bengaluru, India, Sonata Software has a strong global presence, including key regions US, UK, India, Malaysia, Mexico, Australia, DACH (Germany/Switzerland) & Nordics (Finland). We are a trusted partner of Fortune 500 companies in Banking, Financial Services and Insurance; Healthcare and Lifesciences; Telecom, Media, and Technology; and Retail, Manufacturing and Distribution space.

Job Title : UI/UX Resource(React)(Senior Frontend Developer)

Location Berkley Heights NJ

Job Type : Contract

• Web App: Build and maintain React/Next.js components that run reliably inside iOS and Android webviews.
• Accessibility (ADA/WCAG): Ensure product accessibility to meet ADA and WCAG 2.1 AA standards; implement semantic markup, keyboard navigation, focus management, ARIA attributes, screen-reader compatibility (VoiceOver/TalkBack), and automated/manual accessibility testing.
• Shell Scripting & AWS Deployment: Author and maintain shell scripts and CLI tooling for build, deployment, and operations (Bash/zsh). Integrate with AWS tooling and CI/CD pipelines to automate releases, rollbacks, and environment promotion.
• Cross-Platform Collaboration: Coordinate with iOS/Android engineers to maintain reliable webview bridges, intents, and native callbacks; deliver platform-specific UX while maximizing shared code.
• State & Security: Manage Redux state flows for payment/pass data, ensure secure token handling, session management, and adherence to security/PCI considerations.
• Testing & Observability: Write unit/integration tests (Jest, React Testing Library), e2e tests for wallet and widget flows, and instrument critical paths with logging/monitoring (e.g., Datadog).
• Performance & UX: Optimize webview performance for low-power tablets and network-constrained environments; implement progressive enhancement and graceful degradation.
• Code Quality & Processes: Enforce best practices with ESLint, Prettier, Husky, code reviews, and SonarQube/CI checks.

Required Skills & Experience

• Experience: 5 years frontend engineering with strong TypeScript React (v18 ) Next.js experience.
• State Mgmt: Deep knowledge of Redux and side-effect handling (thunks/sagas/observables).
• Wallet Expertise: Practical experience with Apple Wallet and Google Wallet/Passes or equivalent token/pass provisioning.
• Accessibility: Proven ability to deliver accessible applications compliant with WCAG 2.1 AA; experience running VoiceOver/TalkBack and accessibility audit tools.
• Shell & AWS: Proficient in shell scripting (Bash/zsh), AWS CLI, and common AWS services used in frontend delivery; experience automating deployments and troubleshooting CI/CD.
• Mobile WebView: Experience developing/debugging WebView-based apps and native-web interactions.
• Security & Compliance: Secure token handling, CORS, CSRF, secure storage patterns, and familiarity with fintech compliance basics.
• Testing & Tooling: Jest, React Testing Library, CI/CD familiarity, Docker basics, ESLint, Prettier.
• Styling & UX: Material-UI (v4/v5), Emotion/Styled Components, responsive and tablet-first design.

Nice-to-Have

• Native iOS/Android development familiarity.
• Experience generating/signing wallet passes, JWT workflows, or HSM integrations.
• Prior fintech or payments domain experience.

Technical Environment

Frontend: React 18, Next.js, TypeScript, Redux

Styling: Material-UI, Emotion/Styled Components

Testing: Jest, React Testing Library

CI/Deployment: Docker, shell scripts, AWS CLI, CI providers (GitHub Actions/Jenkins/etc.), SonarQube

Monitoring: Datadog.

Why join Sonata Software?

At Sonata, you´ll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what´s possible. To build never seen before solutions to some of the world’s toughest problems. You´ll be challenged, but you will not be alone. You´ll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next.

Sonata Software is an Equal Opportunity Employer encouraging diversity in the workplace. All qualified applicants will receive consideration for employment without regard to race, national origin, gender identity, age, religion, disability, sexual orientation, veteran status, marital status, or any other characteristics protected by law.