Lead Fullstack Engineer (React+Next.js)

N-iX; Brasil; Remote; BRL 140,000 - 180,000; Full time

Benefits offered by this job

Flexible working format

Competitive salary

Personalized career growth

Education reimbursement

Memorable anniversary presents

Corporate events and team buildings

Job summary

N-iX is looking for a talented Senior Full-Stack Engineer to join a team building a large-scale platform for intelligent agreement management. You will design and develop reusable frontend solutions using React and TypeScript while maintaining backend services with Node.js and Express.

The ideal candidate will have 8+ years of experience in software development, collaborate with cross-functional teams, and contribute to high-performance, scalable architectures. N-iX offers flexible working formats and a competitive compensation package.

Qualifications

• 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 or shared libraries.
• Solid understanding of frontend testing practices and tools.
• Experience working on large-scale SaaS products.
• Excellent communication skills and ability to collaborate effectively.

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.
• Collaborate with cross-functional teams to deliver high-quality features.
• Participate in the entire software development lifecycle.

Skills

TypeScript

React

Node.js

Express

REST APIs

Frontend testing

Micro-frontend architecture

Job description

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