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Role overview
Published via Mainder
At Staffy we're seeking 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.
Build and scale core features of the platform using modern full-stack technologies.
Develop high-performance web interfaces and robust backend services.
Design and contribute to the architecture of the Unified Notification System.
Build solutions for delivering real-time updates across multiple channels (SMS, RCS, Push).
Ensure high deliverability, low latency, and scalable communication flows.
Design and optimize backend logic, APIs, and data flows.
Maintain high code quality through testing and clean code practices.
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 and understanding of SMS/RCS protocols and providers (e.g., Twilio, MessageBird, or AWS Pinpoint).
Experience with real-time architecture using WebSockets or Firebase Realtime Database for live UI updates.
Commitment to high test coverage using tools such as Jest, Cypress, or Playwright and clean code principles (SOLID).
English C1 level, with the 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.
Experience with message queues such as 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 monitoring tools such as Sentry or New Relic to track frontend errors and backend bottlenecks.
People First culture.
Free access to streaming platforms.
Free access to Spotify premium.
GYM discount.
Travel discount.
E-Learning discount.
Birthday-day.
We are a technology consulting company in constant growth, specialized in connecting top-tier talent with innovative projects across Latin America and the United States. We support companies of different sizes and industries in building high-performance teams through recruiting, outsourcing, and team-building services.
We are characterized by a culture based on trust, transparency, and collaboration. We value autonomy, continuous learning, and professional development, promoting environments where people can grow, contribute ideas, and generate impact from day one.
Currently, we have more than 60 professionals working remotely across the region, participating in challenging projects with international teams and using cutting-edge technologies to solve real business problems.