About the role

We’re seeking a 602 Software Engineer to build and evolve modern web applications using React and Redux, with a primary focus on GraphQL for data access. You’ll collaborate with product, design, and platform teams to deliver secure, performant, and accessible user experiences at scale. Experience with micro-frontend (MFE) architectures is a plus.

What you’ll do

- Build, test, and maintain responsive React applications using modern patterns (hooks, functional components, context where appropriate).

- Implement predictable state management with Redux/Redux Toolkit, including middleware, selectors, and efficient store design; integrate cleanly with GraphQL client caches.

- Integrate with GraphQL services using Apollo Client or urql: define queries, mutations, and subscriptions; manage normalized caching, pagination (cursor/relay style), error handling, retries, and optimistic updates.

- Partner with backend teams on schema and API contracts (SDL), versioning, and performance patterns (query batching, persisted queries, avoiding n+1 issues).
Partner with design to implement accessible (WCAG-compliant) and consistent UI aligned to a design system.

- Write high-quality, well-tested code (Jest, React Testing Library); automate via CI/CD and follow trunk-based development or GitFlow as applicable.

- Profile and optimize performance (bundle size, code splitting, memoization, virtualization, lazy loading) and GraphQL network usage (field-level policies, cache keys).

- Participate in architecture/design reviews, code reviews, and contribute to shared libraries and component systems.




Document components and patterns for reusability; mentor peers and contribute to engineering best practices.

- Leverage AI-assisted development tools and prompt engineering techniques to accelerate coding workflows, generate boilerplate, write tests, refactor code, and improve documentation quality.

Must-have qualifications

- Professional experience building production-grade React applications (typically 5+ years or equivalent depth).

- Strong JavaScript and TypeScript fundamentals; ESNext, modules, and typing best practices.
Deep experience with Redux/Redux Toolkit and app-level state architecture; familiarity with coordinating Redux state and GraphQL client caches.

- Hands-on experience integrating GraphQL in production front-ends (Apollo Client or urql): queries, mutations, subscriptions, fragments, cache normalization and policies, pagination strategies, error boundaries, and GraphQL Code Generator.

- Testing expertise across unit, integration, and component tests; familiarity with mocking GraphQL operations and contract testing.

- Solid grasp of web fundamentals: semantic HTML, modern CSS (CSS-in-JS, Modules, or utility-first), responsive design.

- Front-end build tooling (Webpack/Vite),



package managers, and linting/formatting (ESLint, Prettier).

- Understanding of auth flows (OAuth/OIDC, JWT), secure storage patterns, and front-end security basics (CSP, CORS, security headers).

- Version control with Git and collaborative development in Agile environments.

- Ability to effectively use AI coding assistants (e.g., GitHub Copilot, LLM Suite) and craft clear, context-rich prompts to improve productivity, code quality, and problem-solving efficiency.

Nice to have

- Micro-frontend architectures (Webpack Module Federation, single-spa, import maps); experience with shared runtime and dependency governance.

- Monorepo tooling (Nx, Turborepo) and shared UI libraries/design systems (Storybook).
Node.js for front-end build tooling or BFFs; familiarity with GraphQL gateways and schema stitching/federation concepts.

- Observability for front-end (metrics, logging, tracing, error monitoring) and feature flagging/experimentation.

- Advanced accessibility expertise (ARIA patterns, keyboard navigation, screen reader support).

- Cloud and CDN basics; understanding of edge caching and performance optimization for APIs and assets.

How we work

- Customer-centric, iterative delivery with clear acceptance criteria and measurable outcomes.

- Code reviews, pair/mob programming as needed, and continuous improvement through retrospectives.

- Emphasis on reliability and resilience: meaningful monitoring, alerting, and on-call participation where applicable.

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📌 Software Engineer III - Front-End Developer - ReactJS (Buenos Aires)
🏢 Testing Site - JPMC
📍 Buenos Aires