Senior Frontend Engineer

SigmaSoftware2

São Paulo, SP, Brazil Remote permanent

Posted: February 2, 2026

Required Skills

Job Description

Are you ready to shape the future of financial technology with cutting-edge frontend solutions? Join Sigma Software as a Senior Frontend Engineer and work on mission‑critical systems that power global payment processing. This role offers the opportunity to collaborate with talented engineers, product managers, and designers to deliver exceptional user experiences.

We are hiring for a senior-level position — Remote work mode, open to candidates worldwide. Employment type: Full-time.

At Sigma Software, you’ll be part of a team that values innovation, scalability, and quality. 

Why join us? You’ll work on high-impact projects, influence architecture decisions, and contribute to a platform used by businesses worldwide.

CUSTOMER

Our customer is a leading SaaS provider in the FinTech industry, specializing in AI-native revenue platforms for finance and accounting teams. Their solutions cover subscription management, billing, and revenue operations for companies of all sizes. With a strong focus on compliance, scalability, and integration with multiple payment gateways, they help businesses streamline financial processes and accelerate growth.

PROJECT

The project involves enhancing and maintaining core payment processing systems, integrating with multiple payment gateways, and ensuring the stability, scalability, and compliance of financial transaction pipelines and APIs. You’ll work closely with cross-functional teams, contributing ideas and influencing architecture.

Key Technologies: React, Next.js, TypeScript, JavaScript, APIs, Postgres, Node.js/NestJS (optional), Vue, Angular

• Develop and maintain scalable, high-performance frontend applications using React and Next.js
• Collaborate with Product, Design, and Backend teams to deliver seamless user experiences
• Integrate APIs and backend services into the frontend
• Participate in architecture discussions, sprint planning, and code reviews
• Ensure responsive design, accessibility, and cross-browser compatibility
• Contribute to continuous improvement of engineering processes and product quality

• 5+ years of professional software engineering experience with strong focus on frontend development
• Solid experience with React (Next.js is a plus)
• Strong proficiency in TypeScript and JavaScript
• Experience integrating APIs into web applications
• Familiarity with backend concepts and relational databases (Postgres)
• Understanding of responsive design, accessibility, and cross-browser compatibility
• Excellent communication skills and collaborative mindset
• English level: Advanced

WILL BE A PLUS

• Experience with other frontend frameworks (Vue, Angular)
• Knowledge of Node.js or NestJS
• Experience with performance optimization and frontend build tools

ERSONAL PROFILE

• Strong problem-solving skills
• Collaborative and communicative team player
• Detail-oriented with focus on quality and user experience
• Values: Proactive, adaptable, innovative mindset

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