Senior Engineer (React/Next.js/React Native/Node.js)

We’re looking for a Senior Full-Stack Engineer to join a B2B SaaS platform with a mobile-first experience and a distributed backend architecture, where performance, data processing, and scalability are critical to the product’s success. This is a great opportunity to work on a complex, real-world product used across multiple regions, contributing not only with code but also with technical decisions and product evolution. What you’ll do Design and build scalable features across frontend, mobile, and backend layers Contribute to architectural decisions and system design Work closely with product and engineering stakeholders Optimize performance and data-intensive workflows Collaborate within a distributed team, bringing a proactive and ownership-driven mindset Tech Stack You’ll be working with a modern, distributed stack: Frontend: React, Next.js, React Native (Expo) Backend: Node.js (Bun), GraphQL, REST Database: MongoDB (complex modeling, read-heavy workloads) Infrastructure: Google Cloud Platform (GCP), Docker, Kubernetes Infrastructure as Code: Terraform, Ansible Messaging: NATS CI/CD: Jenkins + GitHub Testing: Unit, Integration, End-to-End (Playwright) What we’re looking for Strong experience as a Full-Stack Engineer in modern web/mobile environments Solid understanding of scalable systems and distributed architectures Product-oriented mindset and ability to navigate complex systems Proactive, autonomous, and comfortable taking ownership Strong communication and collaboration skills in remote environments Advanced English is required, as you’ll work directly with US-based clients in a fully collaborative environment. ✨ What we offer 20 days of paid time off per year Flexible working hours (we care about results, not clocking in) Remote-first culture Health insurance + fitness benefit Learning & development support In-company English classes Internal knowledge-sharing sessions A collaborative, friendly, and human-centered team environment About VAIRIX VAIRIX is a nearshore software development company that partners with startups and growing organizations to build high-quality software and scale engineering teams. We work in real-time with U.S. clients, combining a boutique approach with strong technical expertise, fast onboarding, and a focus on long-term collaboration. Want to join us? If you're looking for a place where people matter as much as code — this might be it. Let’s talk. Apply To This Job