The Full Stack Engineer builds and runs the digital surfaces the Commercial STO puts in front of Expereo's Customers as well as Commercial and Service Pperations teams, front to back: the React front ends, the service layer those front ends consume, and the integrations that connect them to Salesforce and the wider systems landscape. You will join the Commercial STO, the technology team that owns the systems behind how Expereo quotes, orders, and activates services. A central part of that work is expereoOneNext, the platform that moves request intake, site creation, quoting, order placement, and service activation out of inboxes and spreadsheets and into one place. It is live with its first users and growing, and you will carry features on it from the first conversation with the people who use it to the release that reaches them. This is a hands-on engineering role with a front-end center of gravity and full-stack reach. You are strongest in React and TypeScript, fluent in the Node.js layer between the browser and the backend, and able to deliver a feature end-to-end, including the service and integration parts. You will read and work in C#/.
NET at the integration points with the systems around the platform. You own what you ship, in production, and you are the engineer others on the team rely on to get it right. Front-end delivery Own the React and TypeScript front ends of the surfaces you work on, from component structure and state management to data fetching, caching, and performance. Turn requirements from commercial and operations users into production-quality experiences that make their daily work faster and less error-prone. Keep the front-end codebase coherent as it grows: shared components, consistent patterns, and a design language that holds across screens. Bring the consumer's view into API design:



what the interface needs to look like for the front end to be simple, fast, and correct. Implement the service layer each feature needs, REST or GraphQL, working contract-first from OpenAPI specifications. Build and maintain the integrations with Salesforce and other core systems that commercial data flows through, so that what a user enters on the platform arrives correctly where it is needed downstream. Read and work at the C#/.
NET integration points with the wider systems landscape when a feature crosses them. Own the delivery path for what you ship: configure, deploy, observe, and operate your own surfaces on a managed cloud (AWS), working with the team's DevOps engineers on the shared pipeline rather than waiting on it. Write tests that give real confidence, not coverage numbers, and drive automated quality gates in CI. Diagnose and resolve production issues on the surfaces you own, so the order and activation flows commercial teams depend on keep working. Translate technical constraints and design decisions into plain language for commercial and operations stakeholders. Five plus years of professional software engineering, with production React and TypeScript front ends as your core stack. Node.js and TypeScript services in production, and comfort implementing the layer between the front end and the backend for the features you own. REST and/or GraphQL APIs implemented and consumed in production,



with contract-first OpenAPI as a working method. Ownership of the delivery path for what you ship: you configure, deploy, observe, and operate your own work on a managed cloud, with CI/CD as part of how you work rather than someone else's job. Software engineering discipline: testing, code review, Git, feature flags, and reproducible builds. The systems around the platform include C#/.
NET. You do not need to be expert in it, but you need to read it, understand the integration points, and be willing to write in it. Integration experience with Salesforce, including data models, APIs, and keeping two systems consistent. AWS services in practice: Amplify, Lambda, API Gateway, Cognito, S3, or equivalent. OAuth2 and OIDC in practice (Cognito, Okta or equivalent), including scope models and token lifecycle. C#/.
NET backend exposure, enough to contribute at the integration points. Event-driven or asynchronous integration: queues, SQS, EventBridge, Kafka, or similar. Front-end architecture beyond a single application: micro front ends, module federation, or comparable patterns. Comfort producing C4 diagrams, ADRs, and integration guides. Connectivity, SD-WAN, SASE, or network platform domain background. useful if you have it. Product-minded: you think about the person on the other side of the screen, not just the endpoint behind it. End-to-end ownership: you would rather carry a feature from the first component to the last deployment than hand it off halfway. Reliability matters to you: the people using what you build depend on it to do their jobs. Contract-first is a value, not just a technique. Part of a team that is engaged and owning the things they do, highly trustable with direct commercial stakes. Direct

📌 Full Stack Engineer/Agile Engineer (Barcelona)
🏢 Expereo International
📍 Barcelona