Senior Software Engineer - Fullstack (Fintech)

TL;DR

Senior Software Engineer - Fullstack (Fintech): Translate ideas, designs, and business requirements into high-quality, scalable code using React and Node.js with an accent on reusable components, robust APIs, and performance optimization. Focus on designing secure data communication, enforcing best practices in modular architecture, writing comprehensive tests, and improving DevOps processes.

Company

International fintech startup combining SaaS with human-in-the-loop approach to provide real-time admin, accounting, and bookkeeping services for businesses.

What you will do

• Translate ideas, designs, and business requirements into high-quality, scalable, and maintainable code using React and Node.js.
• Develop reusable components and libraries for consistency and efficiency.
• Optimize frontend and backend for performance, scalability, and reliability.
• Design and implement robust, secure APIs for efficient data communication.
• Write unit, integration, and end-to-end tests with high coverage.
• Improve DevOps processes, CI/CD pipelines, and collaborate with designers, PMs, and engineers.

Requirements

• 5+ years in full-stack development with strong focus on React (hooks) and Node.js (Koa or Express).
• Strong proficiency in JavaScript and TypeScript.
• Experience with RESTful/WebSocket APIs, PostgreSQL (query optimization, schema design), frontend performance (lazy loading, caching).
• Authentication/security (OAuth, JWT), cloud services (AWS: Lambda, RDS, S3, API Gateway), DevOps (CI/CD, Docker, monitoring).
• Able to speak Mandarin
• Strong problem-solving, debugging, and passion for continuous learning.

Culture & Benefits

• Work with real client accounts requiring accuracy and regular communication with clients and teams.
• Build confidence, judgement, and ownership in a rapidly growing team of ~500 across worldwide offices.
• Equal opportunity employer committed to diversity and accessibility support.