CareerPlan

Senior Full Stack Engineer (Node.js)

Warsaw, PolandFull-time2026-09-22 → 2026-10-07

Core

Develop and maintain high-availability, high-volume applications for a global messaging platform serving hundreds of millions of users.

Role type

Senior Full Stack Engineer (Node.js)

Builds

Scalable microservices and frontend features for the Viber super-app

Domain

Consumer Internet / Messaging

Deliverable

production ML models | product features

Required skills

Node.js, TypeScript, Java, React or Angular, REST API design, CI/CD, Docker, SQL/NoSQL databases

Preferred skills

Message queues, event-driven architecture, AWS services (SQS, Lambda, RDS), validation libraries (Zod, Yup), data-fetching libraries (React Query, RTK Query)

Technologies

NestJS, Fastify, Next.js, Docker, AWS

Responsibilities

Design and develop high-availability, low-latency applications; optimize performance and debug across the stack; define application objectives and ensure alignment with business goals; support architectural reviews and continuous improvement.

Seniority

Senior, hands-on IC