Lead Fullstack Engineer (React+Next.js)

N-iX; Warszawa; Híbrido; PLN 120.000 - 160.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Flexible working format

Competitive salary and compensation package

Personalized career growth

Education reimbursement

Corporate events and team buildings

Descripción de la vacante

N-iX is seeking a talented Senior Full-Stack Engineer to join a team building a large-scale platform for intelligent agreement management. This role involves designing and developing high-performance frontend solutions with React and TypeScript, as well as backend services using Node.js.

With over 8 years of experience in software development, you will tackle complex engineering challenges, contribute to a micro-frontend architecture, and participate in a collaborative, fast-paced SaaS environment. Enjoy flexible working options and a competitive salary with benefits.

Formación

• 8+ years of professional software development experience.
• Strong expertise with TypeScript and React.
• Hands-on experience with Node.js, Express, and modern backend development.
• Experience building reusable frontend components, design systems, or shared libraries.

Responsabilidades

• Design and build scalable, reusable UI components and frontend solutions using React and TypeScript.
• Develop and maintain backend services using Node.js and Express.
• Collaborate with cross-functional teams in a fast-paced SaaS environment.
• Participate in the entire software development lifecycle.

Conocimientos

TypeScript

React

Node.js

Express

Frontend Development

REST APIs

Micro-frontend Architecture

CI/CD

Descripción del empleo

We are looking for a talented Senior Full-Stack Engineer to join a team building a modern, large-scale platform that powers intelligent agreement management experiences for millions of users worldwide. Our platform is at the heart of a global SaaS product used by more than 1.7 million organizations across 180+ countries. The team develops a unified, widget-based front-end architecture that enables seamless experiences across document creation, sending, signing, and management. By combining scalable engineering practices with AI-powered workflows, we are transforming the way businesses manage their most important agreements. As a Senior Engineer, you will play a key role in designing and developing high-performance, reusable frontend solutions while contributing to backend services and platform capabilities. You will work on complex engineering challenges involving micro-frontends, scalability, reliability, security, and developer productivity.

Responsibilities

• Design and build scalable, reusable UI components and frontend solutions using React and TypeScript.
• Develop and maintain backend services using Node.js and Express.
• Contribute to a modern micro-frontend architecture and shared platform capabilities.
• Collaborate with cross-functional teams to deliver high-quality features in a fast-paced SaaS environment.
• Write well-tested, maintainable code and contribute to a strong engineering culture.
• Improve performance, reliability, observability, and security across the platform.
• Participate in the entire software development lifecycle, including architecture discussions, implementation, testing, CI/CD, and production releases.

Requirements

• 8+ years of professional software development experience.
• Strong expertise with TypeScript and React.
• Hands-on experience with Node.js, Express, and modern backend development.
• Experience building reusable frontend components, design systems, or shared libraries.
• Solid understanding of frontend testing practices and tools.
• Experience working on large-scale SaaS products.
• Knowledge of REST APIs and modern web architecture.
• Excellent communication skills and ability to collaborate effectively in distributed teams.

Nice to Have

• Experience with Next.js.
• Hands-on experience with micro-frontend architecture.
• Experience with gRPC and API integrations.
• Knowledge of JSON Schema or XML Schema.
• Experience with CI/CD pipelines and Azure DevOps.
• Familiarity with Agile and Test-Driven Development practices.

We Offer

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits
• Not applicable for freelancers