Senior Full Stack Developer – Node.js, React

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BillingPlatform

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2012

☁️ SaaS

💳 Fintech

🤝 B2B

💰 $90M Private Equity Round - BillingPlatform on 2024-01

SaaS • Fintech • B2B

BillingPlatform is a cloud-based SaaS platform that automates enterprise order-to-cash and modern monetization processes. It supports subscription, usage-based and hybrid billing, payments, AR automation, e-invoicing, revenue recognition, and financial reporting while offering no-code configuration, integrations, and AI-powered reporting and assistants to help enterprises reduce DSO, recover revenue leakage, and scale revenue operations.

📋 Description

• Develop and maintain React/TypeScript components • Build and maintain backend services using Node.js, TypeScript, and Express • Design clear, typed contracts for APIs and MCP tools using TypeScript and schema validation • Develop and integrate REST APIs and internal and third-party services • Write and maintain unit and integration tests • Troubleshoot and resolve issues across the application stack • Participate in code reviews and follow internal reuse, security, and testing conventions • Collaborate with backend teams on API contracts, data models, and integration architecture • Use AI coding agents as part of the development workflow • Contribute to the development of AI Copilot and AI Agent capabilities

🎯 Requirements

• 4+ years of experience with Node.js and Express • 2+ years of professional experience with React and TypeScript • Strong TypeScript fundamentals, including generics, utility types, type narrowing, and typed API contracts • Strong understanding of MCP principles • Experience building AI agents • Experience designing and consuming REST APIs • Good understanding of asynchronous JavaScript, Promises, async/await, and error handling • Experience with schema validation libraries such as Zod or similar • Familiarity with Jest, component testing, mocking, and integration testing practices • Understanding of common web security concepts, including CORS, CSRF, input validation, secrets handling, and OWASP fundamentals • Exposure to Model Context Protocol (MCP), AI agent tooling, LLM tool/function calling, or building LLM-facing APIs • Practical experience using AI coding agents such as Codex or Claude Code for code generation, refactoring, testing, and debugging • Experience with AWS Bedrock • Prior experience with fintech or financial systems • Experience working with sensitive customer or financial data • Experience with AWS services and production cloud environments • Docker experience • Experience with OpenAPI/Swagger and API contract documentation • Familiarity with observability tooling, structured logging, metrics, and production debugging • Understanding of API reliability patterns such as retries, timeouts, rate limiting, and idempotency • Experience designing tools or APIs specifically for LLM agents • Experience evaluating or debugging AI-agent workflows and tool calls

🏖️ Benefits

• Opportunity to contribute to global initiatives and work with an international team • A high-impact role at a growing SaaS company that values personal growth, accountability, and teamwork • Supportive, transparent culture focused on open communication and problem-solving • Company-sponsored English lessons for non-native speakers to support ongoing language development • Fully remote work environment • Competitive pay