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Somnio Software

Senior Full-stack Engineer (Node.js & React - client NestX MVP)

Somnio Software · Buenos Aires, Autonomous City of Buenos Aires, Argentina

Software Development · 51-200 employees

Yesterday
Remote Senior (5-10 yrs) Part-time Argentina
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About the role

Develop high-performance web interfaces and robust backend services for the NestX MVP. Architect and scale a Unified Notification System to deliver real-time updates across SMS, RCS, and Push channels.

What they look for

Node.js React TypeScript GraphQL Firebase Firestore Cloud Functions SMS/RCS Protocols WebSockets Jest Cypress Playwright SOLID Principles Prompt Engineering English C1 NestJS

Requirements

Requires over 7 years of full-stack experience with expertise in React, Node.js, GraphQL, and the Firebase ecosystem. Must be proficient in English and capable of using AI prompt engineering for development tasks.

Full description

We are looking for a Senior Full-stack Engineer with a product-driven mindset to build and scale core features of our platform. You will be responsible for developing high-performance web interfaces and robust backend services that handle complex data flows.

A major focus of this role will be the architecture of our Unified Notification System. You will tackle the challenge of delivering real-time updates across multiple channels (SMS, RCS, Push) at scale, ensuring high deliverability and low latency.

Must Have

  • 7+ years of professional experience in full-stack development using JavaScript/TypeScript.
  • Frontend Excellence: Expert-level proficiency in React (Hooks, Context API, Performance Optimization) and modern state management.
  • Backend Mastery: In-depth experience with Node.js (Express or NestJS) and designing efficient, scalable server-side logic.
  • GraphQL Expert: Proven experience designing GraphQL schemas, writing complex resolvers, and optimizing queries (Apollo Server/Client).
  • Firebase Ecosystem: Professional experience with Firebase Services, specifically Firestore (NoSQL modeling), Firebase Auth, and Cloud Functions.
  • Scalable Communications: Experience building or integrating notification engines. In-depth understanding of SMS/RCS protocols and providers (e.g., Twilio, MessageBird, or AWS Pinpoint).
  • Real-time Architecture: Experience with WebSockets or Firebase Realtime Database for live UI updates.
  • Testing & Quality: Committed to high test coverage (Jest, Cypress, or Playwright) and clean code principles (SOLID).
  • English C1: Ability to collaborate in a multicultural environment and document technical decisions clearly.
  • Prompt Engineering for Devs: Ability to write structured prompts for AI agents to generate unit tests, documentation, and boilerplate code accurately.

Nice to have

  • Message Queues: Experience with BullMQ, RabbitMQ, or Amazon SQS to handle asynchronous notification bursts.
  • AI Integration: Familiarity with consuming LLM outputs on the frontend (streaming text, markdown rendering).
  • Mobile First: Experience with Responsive Web Design and PWA (Progressive Web Apps).
  • Performance Monitoring: Experience using Sentry or New Relic to track frontend errors and backend bottlenecks.