Senior Frontend Engineer (TypeScript/Angular/React -REMOTE U.S.)

MARKETTIME, LLC; United States; Remote; USD 120,000 - 170,000; Full time

Job summary

MARKETTIME, LLC is hiring a Senior Frontend Engineer to advance our ecommerce SaaS platform. You will work on existing Angular apps today and influence the frontend roadmap toward a unified React-based platform for desktop, tablet, and mobile, including offline-enabled experiences.

You will collaborate with product, design, and backend engineers to simplify complex B2B workflows, mentor peers, and uphold PCI DSS and security standards while delivering high-performance user interfaces.

Qualifications

• Experience on production frontend applications as a senior engineer or tech lead.
• Strong React ecosystem experience (hooks, components, context, data fetching).
• Proficient in TypeScript and its type system.
• Knowledge of Angular or ability to ramp quickly in an existing codebase.
• Built responsive UIs across desktop, tablet, and mobile.
• Experience with REST/GraphQL APIs.
• Experience with modern frontend testing tools (Vitest/Jest, React Testing Library, Playwright).
• Familiar with AI coding tools and prudent use in professional work.
• Experience with build tools (Vite, webpack) and CI/CD (GitHub Actions).
• Solid web security knowledge (XSS, CSRF, CSP, token handling).
• Excellent communication and collaboration; track record mentoring engineers.
• Remote-first work ethos.

Responsibilities

• Design, develop, and maintain customer-facing web applications for buyers, sales reps, and brands.
• Define architecture for the frontend platform, including components, state, routing, APIs, and tooling.
• Explore cross-platform approaches (PWA, React Native/Expo) for desktop, tablet, and mobile.
• Build offline-capable, resilient experiences for intermittent connectivity.
• Create and maintain a reusable, accessible component library and design system.
• Maintain Angular apps and lead migration toward React or similar tech.
• Collaborate with backend engineers to design REST/GraphQL APIs for frontend needs.
• Ensure frontend code meets PCI DSS and security requirements.
• Own frontend performance metrics like Core Web Vitals.
• Champion best practices: code reviews, testing, CI/CD, observability, docs.
• Leverage AI-assisted tools to accelerate delivery while ensuring security and maintainability.
• Own features from design through production and support deployments.
• Perform on-call rotation and participate in incremental PRs with reviews.
• Mentor engineers through leadership, design reviews, and pair programming.

Skills

React

TypeScript

Angular

REST/GraphQL

Testing (Vitest/Jest)

CI/CD (GitHub Actions)

Accessibility

Web security basics

Remote collaboration

AI-assisted coding tools

Tools

Vite

webpack

GitHub Actions

Playwright

Vitest

Jest

React Native

Expo

CI/CD tooling

Datadog RUM

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

R&D : Onshore Development Full Time US

8 days ago Requisition ID: 1011

RemotePosition

About Us

We are a growing B2B ecommerce SaaS company helping businesses sell smarter and faster. Our multi-tenant platform powers enterprise customers across multiple industries, processing sensitive financial data—including credit card payments—while maintaining rigorous PCI DSS compliance.

Our customers—brands, sales reps, and retail buyers—rely on our web applications every day to browse catalogs, build orders, and manage their business, at the office and on the road.

We're a fully distributed engineering team that values ownership, collaboration, continuous improvement, and building software the right way.

About the Role

We're looking for a Senior Frontend Engineer (TypeScript/Angular/React) to help build and evolve the user-facing side of our ecommerce platform. You'll work on our existing Angular applications today while playing a key role in shaping our next-generation frontend: a single platform, potentially React-based, designed to deliver a fast, consistent experience across desktop, tablet, and mobile, including offline-capable and installable experiences.

You'll work closely with Product, Design, and backend engineers to turn complex B2B workflows into intuitive, performant interfaces. Beyond writing code, you'll mentor other engineers, help define frontend architecture and standards, and drive engineering best practices across the team.

Responsibilities

Design, develop, and maintain customer-facing web applications for buyers, sales reps, and brands.

Help define the architecture of our next-generation frontend platform, including component design, state management, routing, data fetching, and build tooling.

Evaluate and implement cross-platform approaches (Progressive Web Apps, React Native/Expo) to deliver a great experience across desktop, tablet, and mobile.

Build offline-capable, resilient experiences for users working with intermittent connectivity.

Build and maintain a reusable, accessible component library and design system.

Maintain our existing Angular applications and help lead a possible migration to new technology, such as React.

Collaborate with backend engineers to design REST and GraphQL APIs that are intuitive, efficient, and well-suited to frontend needs.

Ensure frontend code meets PCI DSS and security requirements.

Own frontend performance: bundle size, rendering performance, Core Web Vitals, and perceived responsiveness on real-world devices and networks.

Champion engineering best practices including code reviews, automated testing, CI/CD, observability, and documentation.

Use AI-assisted development tools (e.g., Claude Code, Cursor, GitHub Copilot) to accelerate delivery, while owning the correctness, security, and maintainability of everything you ship.

Take ownership of features from design through production, including monitoring and operational support.

Work in small, incremental pull requests with a strong emphasis on code reviews, automated testing, and continuous delivery.

Mentor and support engineers through technical leadership, design reviews, and pair programming.

Troubleshoot production issues and participate in an on-call rotation as needed.

Required Qualifications

Operated as a senior engineer or technical lead on production frontend applications.

Strong expertise with React and its modern ecosystem (hooks, functional components, context, and current state management and data-fetching patterns).

Strong proficiency with TypeScript, including idiomatic use of its type system.

Working knowledge of Angular, or the ability to quickly become productive in an existing Angular codebase.

Experience building responsive interfaces that work well across desktop, tablet, and mobile devices.

Experience consuming and helping shape REST and/or GraphQL APIs.

Experience with modern frontend testing tools (e.g., Vitest or Jest, React Testing Library, Playwright).

Hands-on experience using AI coding tools in professional work, with sound judgment about when to trust, verify, or discard their output, and a clear understanding of what data must never be shared with them.

Experience with modern build tooling (e.g., Vite, webpack) and CI/CD platforms such as GitHub Actions.

Solid understanding of web security fundamentals ( XSS , CSRF , CSP , secure token handling).

Excellent communication, collaboration, and problem-solving skills.

A track record of mentoring engineers and leading technical initiatives.

Self-motivated and effective working in a remote-first environment.

Preferred Qualifications

Experience building Progressive Web Apps, including service workers, offline storage (IndexedDB), and background sync.

Experience with React Native and/or Expo, including shipping apps to the App Store or Google Play.

Experience testing React Native apps (Jest, React Native Testing Library, Detox or Maestro).

Experience sharing code and components between web and native applications.

Experience leading or contributing to a large-scale frontend framework migration.

Experience building and maintaining design systems or component libraries.

Experience building multi-tenant or white-labeled SaaS applications.

Experience with frontend observability tools such as Datadog RUM or Sentry.

Understanding of payment processing systems, PCI DSS , and secure checkout flows.

Background in ecommerce, B2B wholesale, or field sales applications.

Familiarity with API security concepts including OAuth 2.0, JWT, authentication, and authorization.

Experience establishing team practices for AI-assisted development (e.g., shared context and conventions files, review standards for AI-generated code, guardrails for sensitive data).

Working knowledge of Java/Spring Boot or other backend technologies.