FinTech Full-Stack Engineer: AI-Driven APIs & React UI

United States Digital Space LLC; Singapore; On-site; SGD 60,000 - 90,000; Full time

Job summary

United States Digital Space LLC is seeking a capable full-stack engineer to design and build high-performance backend services and a responsive React SPA for trading, KYC, and financial workflows. You will integrate frontend with robust REST APIs, manage authentication flows, and apply AI-assisted coding to accelerate delivery.

The role requires 2+ years of full-stack experience with Django/FastAPI/Flask, Django REST Framework, React, and database tuning across MySQL/PostgreSQL and NoSQL stores.

Qualifications

• Bachelor's degree in Computer Science or a related field.
• Minimum 2 years of full-stack development experience; strong command of Django / FastAPI / Flask, proficient with Django REST Framework and API design.
• Strong React frontend skills: JavaScript (ES6+) / JSX, function components + Hooks, React Router; solid component-based architecture.
• Familiar with React state management (Context API + Hooks); comfortable with Vite, pnpm, ESLint.
• Proficient in HTML/CSS, responsive design, API integration, authentication (JWT / 2FA) and CORS in a decoupled architecture.
• Proficient in AI-assisted engineering: using Codex and Claude Code to support the SDLC.
• Solid grasp of multithreading/async programming for high-concurrency scenarios.
• Hands-on experience with message queues (Kafka, RabbitMQ, Redis Pub/Sub).
• Strong relational databases (MySQL, PostgreSQL) and NoSQL stores (MongoDB, Redis) with performance tuning.
• Familiar with Linux and basic deployment/automation; experience with banking or crypto integrations is a plus.
• Proven analytical/problem-solving skills and good teamwork/communication.
• Mandarin proficiency is preferred for collaboration.

Responsibilities

• Design and develop high-performance backend services and stable RESTful APIs in a decoupled architecture.
• Build services with Django / FastAPI / Flask and Django REST Framework for business APIs.
• Develop and maintain a React + Vite SPA for trading, KYC/onboarding, fiat, settlement, and accounts.
• Integrate frontend with backend APIs, handle JWT/2FA, validation, reCAPTCHA, and e-sign flows.
• Leverage AI-assisted coding tools to improve velocity, quality, and delivery speed.
• Implement and optimise multithreading/async processing for high concurrency.
• Use Kafka, RabbitMQ, or Redis Pub/Sub for messaging and async tasks.
• Contribute to database design/optimisation (MySQL/PostgreSQL/MongoDB/Redis).
• Collaborate with product/design/QA from design to delivery and continuous improvement.
• Write quality code and tests; participate in code reviews; support deployment and monitoring (GCP)
• Uphold security and data compliance in a regulated financial context.

Skills

Full-stack development

Django / FastAPI / Flask

Django REST Framework

React (ES6+)

React Hooks

REST API design

JWT / 2FA authentication

Database design (MySQL/PostgreSQL)

NoSQL (MongoDB/Redis)

Web security

Education

Bachelor's degree in Computer Science or related field

Tools

Kafka

RabbitMQ

Redis Pub/Sub

Job description

United States Digital Space LLC is seeking a capable full-stack engineer to design and build high-performance backend services and a responsive React SPA for trading, KYC, and financial workflows. You will integrate frontend with robust REST APIs, manage authentication flows, and apply AI-assisted coding to accelerate delivery.

The role requires 2+ years of full-stack experience with Django/FastAPI/Flask, Django REST Framework, React, and database tuning across MySQL/PostgreSQL and NoSQL stores.