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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # VTEX Flutter Fullstack Engineer - **Company:** UST Inc - **Location:** San Jose, CA, United States (Remote available) - **Contract:** Permanent contract - **Skills:** Flutter, JavaScript (Programming Language), Multitier Architecture, Application Programming Interfaces (APIs), Amazon Web Services, IOS Applications, HTML5, Build Automation, Unit Testing, Microsoft Azure, Cascading Style Sheets (CSS), Cloud Computing, Code Review, Continuous Integration, Data Validation, Relational Databases, Software Design Patterns, Web Development, Payment Systems, Fault Tolerance, Fraud Prevention and Detection, Github, Push Technology, PostgreSQL, MySQL, Node.Js, Object-Relational Mapping, OAuth, PCI Data Security Standards, E2e Testing, Swagger, Software Engineering, Data Streaming, Systems Integration, Tokenization, TypeScript, WebSocket, Web Usability, Openapi, Data Logging, ReactJS, System Availability, Cypress (Programming Language), Caching, Firebase, Backend, Git, Modularization, Integration Tests, Solid Principles, Bitbucket, Graphql, Data Management, React Native, Terraform, Es2015, Software Version Control, Docker, Microservices - **Published:** June 29, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=9a46b7497ab65656 ## About the Role Do you have experience in WebSocket?, * VTEX Ecosystem: Proven experience with VTEX: store configuration and customization, VTEX IO, custom app development, Checkout, Master Data, OMS, Catalog, and promotions. Integration with VTEX APIs (REST/GraphQL) and experience with Site Editor/CMS. * Web Frontend: React + TypeScript + JavaScript (ES6+). HTML5/CSS3 (advanced proficiency), responsive/Mobile-First. Design patterns and accessibility; optimization of Core Web Vitals and SSR/caching. * Backend: Node.js + TypeScript; design and development of REST/GraphQL APIs. ORM (e.g., TypeORM/Prisma/Sequelize) and relational databases (PostgreSQL/MySQL). Microservices, Clean Architecture, and SOLID principles. * Security: OAuth2/JWT, rate limiting, validation, basic auditing. Swagger/OpenAPI for documentation. * Quality & DevX: Unit testing (Jest) and end-to-end testing (Cypress preferred). Git (branching/PR/code review), CI/CD (GitHub Actions/Bitbucket Pipelines). * Observability: structured logging, metrics, and traces (hands-on experience preferred). Mobile - Flutter Intermediate to advanced Flutter development: Clean Architecture, BLoC/Cubit/Riverpod, modularization, and performance best practices. Integration with payment platforms and Firebase (Auth/Firestore/Messaging) where applicable. Build automation and code signing (CI/CD mobile). * Payments (domain) Extensive experience in e-commerce payments: payment orchestration, tokenization, 3DS, reconciliation, fraud prevention, retries, and error handling. Knowledge of PCI (within the developer's scope), security best practices, and payment compliance. Desired Skills FastStore in VTEX and advanced caching strategies. * Docker and Kubernetes; cloud experience (AWS/GCP/Azure) for microservices. React Native (plus) and native iOS/Android modules. Complex integrations with ERP/OMS/CRM and messaging/streaming (pub/sub, events). * Experience with advanced rate limiting, retries with backoff, and circuit breakers. Infra as Code (Terraform), feature flags, and toggling. Experience with high availability and SRE (basic SLO/SLI/SLAs)., software engineering,flutter development,payment domain,integration testing,relational database ## Description UST is searching for a Fullstack Software Developer who will develop and maintain custom apps in VTEX IO and Store Themes; configure Checkout, Promotions, Master Data, OMS, Catalog, and Payments. The opportunity: * Build high-performing storefronts with React/TypeScript, optimizing Core Web Vitals, SSR, and caching. Integrate VTEX APIs (REST/GraphQL) and FastStore (preferred) using a headless commerce approach. * Backend & Architecture: Design and implement microservices and REST/GraphQL APIs (Node.js/TypeScript), with ORM and relational databases (e.g., PostgreSQL/MySQL). * Ensure security (OAuth2/JWT, rate limiting, input validation, secrets management) and observability (logs, metrics, traces). Document with OpenAPI/Swagger and maintain high quality with unit/integration testing (Jest; Cypress for end-to-end). * Mobile - Flutter Design and develop Flutter apps with Clean Architecture, state management (BLoC/Cubit/Riverpod), modularization, and performance best practices (profiling, lazy loading, custom painters where applicable). * Integrate mobile payment methods, push notifications, WebSockets/real-time, and Firebase (Auth, Firestore, Messaging) where applicable. * Automate mobile CI/CD, code signing, and publishing/version management (enterprise or stores). Payments Integration with PSPs/gateways, tokenization/vault, 3DS, reconciliation, and reversal/retry flows. * PCI compliance and controls (within the scope of the role), fraud prevention, and integration with anti-fraud/scoring systems. Design for high availability, resilience, and fault tolerance in critical payment flows. * Collaboration & Leadership: Gathering requirements from business/finance/compliance and technical stakeholders. Mentoring mid/junior developers; end-to-end ownership from design to operation. Creating clear and maintainable technical documentation. This position description identifies the responsibilities and tasks typically associated with the performance of the position. 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