Senior Full-Stack Engineer (React & Node.js) | FinTech Platform

Senior Full-Stack Engineer (React & Node.js) | FinTech Platform The MissionHelp modernize financial infrastructure for over 500,000 users. You’ll join our Core Transactions Squad, building high-throughput, low-latency financial systems and intuitive user interfaces. Your goal is to modernize legacy payment pathways into an ultra-fast, modern API platform without sacrificing the absolute security and reliability our customers depend on every day.The RoleWorking closely with our Staff Engineer and Product Lead, you will spend your time architecting and building end-to-end features across both backend microservices and frontend web applications. We operate as a remote-first, high-bandwidth squad—expect pair programming sessions, active Slack/Zoom discussions, and true collaborative technical ownership.Core Platform Engineering (60%): Design, build, and maintain high-volume Node.js services and APIs processing real-time transactional data with stringent uptime requirements.Frontend UI/UX (30%): Craft modern, responsive, and highly accessible React components for our consumer dashboard, ensuring flawless execution of complex financial workflows.AI-Accelerated Workflows (10%): Integrate state-of-the-art AI development tools into your daily workflow to automate boilerplate code, streamline testing, and maintain rapid delivery cycles.Incident & Performance Ownership: Conduct proactive system monitoring, investigate complex distributed system anomalies, and take ownership of performance optimizations.The Must-Haves5+ Years Experience: Proven track record building and operating scalable, high-traffic web applications in production environments.Backend Mastery: Deep proficiency with Node.js, TypeScript, RESTful/GraphQL APIs, and microservices architectures.Frontend Strength: Advanced experience with modern React, State Management (Redux/Zustand), and TypeScript.Database & Data Pipelines: Hands-on experience with PostgreSQL and Redis, including query optimization, data modeling, and schema migrations.Testing & Quality: Mandatory expertise with Jest, React Testing Library, and end-to-end testing frameworks (Cypress or Playwright).AI-Enabled Development: Daily usage of modern AI coding assistants (Cursor, GitHub Copilot, or Claude Code) paired with strong independent technical judgment.The Bonus SkillsCloud & DevOps: Direct experience with AWS services (ECS, Lambda, SQS, DynamoDB) and Infrastructure as Code (Terraform).FinTech Context: Prior experience working with payment gateways, banking APIs, or PCI-DSS compliant systems.Event-Driven Architecture: Familiarity with message brokers such as Kafka, RabbitMQ, or AWS EventBridge.Personal TraitsEnd-To-End Ownership: You view yourself as a product owner, actively taking features from initial specification through implementation, testing, deployment, and monitoring.Security & Reliability Mindset: You intuitively consider edge cases, system failure modes, and data protection before writing a single line of code.High-Bandwidth Communicator: You thrive in collaborative environments, effectively articulating complex technical trade-offs to non-technical stakeholders and peers alike.Relentless Curiosity: You actively explore emerging technologies and tools to continuously elevate your own efficiency and the quality of the team's output.