{"id":1035525,"url":"https://alion.io/job/sigma-software-group-seniorprincipal-frontend-engineer-2","title":"Senior/Principal Frontend Engineer","company":{"id":6266,"name":"Sigma Software Group","domain":"sigma.software","url":"https://alion.io/company/sigma-software-group","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":null},"role":"Frontend","role_family":"Frontend","seniority":"lead","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["São Paulo, Brazil"],"countries":["BR"],"hiring_countries":["BR"],"hiring_countries_total":1,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Angular","optional":false},{"name":"Anthropic","optional":false},{"name":"JavaScript","optional":false},{"name":"LLM","optional":false},{"name":"Nest.JS","optional":false},{"name":"Next.js","optional":false},{"name":"Node JS","optional":false},{"name":"OpenAI","optional":false},{"name":"PostgreSQL","optional":false},{"name":"React.js","optional":false},{"name":"TypeScript","optional":false},{"name":"Vue.js","optional":false}],"status":"live","first_seen_at":"2026-09-09T12:59:53Z","employer_posted_date":"2026-09-09","last_verified_at":"2026-10-23T20:49:02Z","board_verified":true,"closed_at":null,"days_open":44,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":44},"description":"Join an innovative project at the intersection of FinTech and AI technologies. We are looking for a Senior/Principal Frontend Engineer to help build scalable, high-performance web applications for modern finance and accounting teams. This is a full-time remote position based in Brazil.\nWe at Sigma Software value engineering excellence, collaboration, and continuous growth. In this role, you will work closely with Product, Design, and Backend teams to create intuitive user experiences and deliver impactful solutions for a global SaaS platform.\nWhy join us? You will have the opportunity to work with modern technologies, contribute to AI-powered product development, and grow in a supportive international environment with flexible work arrangements and professional development opportunities.\nCUSTOMER\nOur Customer is a global SaaS company building an AI-native revenue platform for modern finance and accounting teams. The company specializes in subscription management, billing, and revenue operations solutions that help businesses automate financial workflows and optimize recurring revenue processes. Their products support scalable financial operations while maintaining high standards of reliability, compliance, and performance.\nPROJECT\nThe project focuses on developing and enhancing modern web applications that support core payment processing systems and revenue operations workflows. The team works on scalable frontend solutions integrated with multiple payment gateways and backend APIs, ensuring smooth user experiences, high performance, and operational stability. The platform combines financial technology capabilities with AI-driven functionality to improve usability and automation for finance and accounting teams.\n Develop and maintain scalable, high-performance frontend applications using React and Next.js\nCollaborate with Product, Design, and Backend teams to deliver seamless and user-friendly experiences\nIntegrate APIs and backend services into frontend applications\nParticipate in architecture discussions, sprint planning, code reviews, and technical decision-making\nEnsure responsive design, accessibility, and cross-browser compatibility\nContribute to continuous improvement of engineering processes, frontend standards, and product quality\nWork closely with backend engineers to ensure smooth end-to-end functionality\nSupport performance optimization and frontend scalability initiatives\n 5+ years of professional software engineering experience with strong focus on frontend development\nSolid commercial experience with React\nExperience with Next.js or similar modern frontend frameworks\nStrong proficiency in TypeScript and JavaScript\nExperience integrating APIs into web applications\nUnderstanding of backend concepts and relational databases such as Postgres\nKnowledge of responsive design, accessibility, and cross-browser compatibility principles\nStrong communication and collaboration skills\nAbility to work independently in distributed teams\nUpper-Intermediate English level or higher\nWILL BE A PLUS\nExperience with Vue or Angular\nKnowledge of Node.js or NestJS\nExperience with frontend performance optimization and build tools\nExperience building AI-powered user experiences\nExperience integrating AI/LLM services into frontend applications\nFamiliarity with OpenAI, Anthropic, AI SDKs, or prompt-based applications\nPERSONAL PROFILE\nProduct-oriented mindset\nProactive communication style\nAttention to UI/UX quality\nStrong ownership and accountability\nAbility to work in collaborative 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