Senior Full-stack Engineer – Node.js, React

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Somnio Software

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2019

🛍️ eCommerce

💳 Fintech

eCommerce • Healthcare • Fintech

Somnio Software is a leading Flutter app development company based in Uruguay, specializing in creating tailored cross-platform applications for various industries. With a focus on full product development, product discovery, and staff augmentation, Somnio aims to help businesses optimize their digital presence and achieve success through innovative solutions. The company is known for its expertise in Flutter, which allows for rapid and cost-effective app development across mobile, web, and desktop platforms, catering to sectors such as healthcare, fintech, education, media, and retail.

📋 Description

• Build and scale core features of the platform. • Develop high-performance web interfaces and robust backend services that handle complex data flows. • Architect the Unified Notification System and deliver real-time updates across multiple channels (SMS, RCS, Push) at scale, ensuring high deliverability and low latency.

🎯 Requirements

• 7+ years of professional experience in full-stack development using JavaScript/TypeScript. • Expert-level proficiency in React (Hooks, Context API, Performance Optimization) and modern state management. • In-depth experience with Node.js (Express or NestJS) and designing efficient, scalable server-side logic. • Proven experience designing GraphQL schemas, writing complex resolvers, and optimizing queries (Apollo Server/Client). • Professional experience with Firebase Services, specifically Firestore (NoSQL modeling), Firebase Auth, and Cloud Functions. • Experience building or integrating notification engines. • In-depth understanding of SMS/RCS protocols and providers (e.g., Twilio, MessageBird, or AWS Pinpoint). • Experience with WebSockets or Firebase Realtime Database for live UI updates. • Committed to high test coverage (Jest, Cypress, or Playwright) and clean code principles (SOLID). • Ability to collaborate in a multicultural environment and document technical decisions clearly. • Ability to write structured prompts for AI agents to generate unit tests, documentation, and boilerplate code accurately. • Nice to have experience with BullMQ, RabbitMQ, or Amazon SQS to handle asynchronous notification bursts. • Familiarity with consuming LLM outputs on the frontend (streaming text, markdown rendering). • Experience with Responsive Web Design and PWA (Progressive Web Apps). • Experience using Sentry or New Relic to track frontend errors and backend bottlenecks.